NATCO GROUP INC
S-1/A, 1999-10-01
FABRICATED PLATE WORK (BOILER SHOPS)
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<PAGE>   1


   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER   , 1999


                                                      REGISTRATION NO. 333-48851
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                               ------------------

                                AMENDMENT NO. 2

                                       TO

                                    FORM S-1

            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                               ------------------

                                NATCO GROUP INC.
             (Exact Name of Registrant as specified in its charter)


<TABLE>
<S>                                    <C>                                    <C>
              DELAWARE                                 3443                                22-2906892
    (State or other jurisdiction           (Primary Standard Industrial                 (I.R.S. Employer
  of incorporation or organization)         Classification Code Number)                Identification No.)
</TABLE>



<TABLE>
<S>                                                 <C>
                                                                     J. MICHAEL MAYER
                                                    SENIOR VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                                                                     NATCO GROUP INC.
             BROOKHOLLOW CENTRAL III                             BROOKHOLLOW CENTRAL III
         2950 NORTH LOOP WEST, SUITE 750                     2950 NORTH LOOP WEST, SUITE 750
               HOUSTON, TEXAS 77092                                HOUSTON, TEXAS 77092
                  (713) 683-9292                                      (713) 683-9292
   (Address, including zip code, and telephone      (Name, address, including zip code, and telephone
                     number,                                   number, including area code,
               including area code,                               of agent for service)
   of Registrant's principal executive offices)
</TABLE>


                                   Copies To:


<TABLE>
<S>                                                 <C>
              VINSON & ELKINS L.L.P.                    AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.
          1001 FANNIN STREET, SUITE 2300                     1700 PACIFIC AVENUE, SUITE 4100
            HOUSTON, TEXAS 77002-6760                            DALLAS, TEXAS 75201-4618
                  (713) 758-2222                                      (214) 969-4780
            ATTN.: WILLIAM E. JOOR III                          ATTN.: SETH R. MOLAY, P.C.
</TABLE>


                               ------------------

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.
    If any of the securities registered on this Form are being offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]

    If this Form is a post-effective amendment filed pursuant to Section 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]


                        CALCULATION OF REGISTRATION FEE



<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------
- ----------------------------------------------------------------------------------------------------------------
                                                        PROPOSED MAXIMUM                    AMOUNT OF
       TITLE OF EACH CLASS OF SECURITIES                    AGGREGATE                     REGISTRATION
              TO BE REGISTERED(1)                     OFFERING PRICE(2)(3)                     FEE
- ----------------------------------------------------------------------------------------------------------------
<S>                                              <C>                             <C>
Class A Common Stock, par value $0.01(4)........          $111,000,000                     $30,858(5)
- ----------------------------------------------------------------------------------------------------------------
- ----------------------------------------------------------------------------------------------------------------
</TABLE>



(1) In accordance with Rule 457(o) under the Securities Act, the number of
    shares being registered and the proposed maximum offering price per share
    are not included in this table.


(2) Estimated solely for the purpose of computing the registration fee in
    accordance with Rule 457 of the Securities Act.


(3) Includes shares to be offered by the selling stockholder and shares subject
    to an option granted to the underwriters to cover over-allotments.


(4) Includes associated preferred share purchase rights, which currently are
    attached to and trade with the shares of Class A Common Stock registered
    hereby.


(5) Of this amount, $24,249 was paid at the time of filing the registration
    statement amended hereby and the balance is paid herewith.


    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2


                    SUBJECT TO COMPLETION --          , 1999


- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------


PROSPECTUS


          , 1999


                                 [LOGO TO COME]

                               SHARES OF CLASS A COMMON STOCK



NATCO GROUP INC.:



- - We are a leading provider of wellhead equipment, systems and services used in
  the production of oil and gas.



- - NATCO Group Inc.


  Brookhollow Central III


  2950 North Loop West, Suite 750


  Houston, Texas 77092


  (713) 683-9292



PROPOSED SYMBOL & MARKET:



- - NTG/New York Stock Exchange


THE OFFERING:



- - We are offering 5,000,000 shares of our common stock and a selling stockholder
  is offering           shares of our common stock for resale.



- - We have granted the underwriters an option to purchase an additional
  shares of common stock to cover over-allotments.



- - This is our initial public offering, and no public market currently exists for
  our shares.



- - We anticipate that the initial public offering price for our common stock will
  be between $     and $     per share.



- - We will not receive any proceeds from the sale of common stock by the selling
  stockholder.



- - We plan to use the proceeds from this offering to repay outstanding debt and
  for general corporate purposes, including pending acquisitions.



- - Closing:          , 1999.



<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------
                                                              Per Share    Total
- ----------------------------------------------------------------------------------
<S>                                                           <C>         <C>
Public offering price:                                        $           $
Underwriting fees:
Proceeds to NATCO:
Proceeds to the selling stockholder:
- ----------------------------------------------------------------------------------
</TABLE>



     THIS INVESTMENT INVOLVES RISK. SEE "RISK FACTORS" BEGINNING ON PAGE 7.


- --------------------------------------------------------------------------------


Neither the SEC nor any state securities commission has determined whether this
prospectus is truthful or complete. Nor have they made, nor will they make, any
determination as to whether anyone should buy these securities. Any
representation to the contrary is a criminal offense.

- --------------------------------------------------------------------------------

DONALDSON, LUFKIN & JENRETTE


                       SALOMON SMITH BARNEY


                                                  SIMMONS & COMPANY

                                                          INTERNATIONAL
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND WE ARE NOT SOLICITING OFFERS TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.
<PAGE>   3


                                    MAP PAGE

<PAGE>   4


                               TABLE OF CONTENTS



<TABLE>
<CAPTION>
                                         PAGE
<S>                                      <C>
Prospectus Summary.....................    1
Risk Factors...........................    7
Cautionary Statement Regarding Forward
  Looking Statements...................   14
Use of Proceeds........................   15
Dividend Policy........................   15
Dilution...............................   16
Capitalization.........................   17
Selected Consolidated Financial Data...   18
Unaudited Condensed Pro Forma Financial
  Statements...........................   20
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations...........................   25
</TABLE>



<TABLE>
<CAPTION>
                                         PAGE
<S>                                      <C>
Business...............................   35
Management.............................   46
Related Party Transactions.............   55
Principal and Selling Stockholders.....   59
Description of Capital Stock...........   60
Shares Eligible for Future Sale........   64
Underwriting...........................   65
Legal Matters..........................   67
Experts................................   67
Available Information..................   68
Index to Financial Statements..........  F-1
</TABLE>



     NATCO GROUP INC. We were incorporated in Delaware in 1988. In 1989, we
acquired National Tank Company, which was founded in 1926 and is now our
principal operating subsidiary. The address of our principal executive offices
is Brookhollow Central III, 2950 North Loop West, Suite 750, Houston, Texas
77092, and our telephone number is (713) 683-9292.

                               ------------------


     You should rely only on the information contained in this prospectus or to
which we have referred you. We have not authorized anyone to provide you with
different information. This document may be used only where it is legal to sell
these securities. The information in this prospectus is only accurate on the
date of this prospectus. In this prospectus, all references to "we," "us" and
"our" refer to NATCO Group Inc. and its subsidiaries, unless indicated
otherwise.



                     DEALER PROSPECTUS DELIVERY OBLIGATION



     UNTIL             , 1999 (25 DAYS AFTER THE DATE OF THIS PROSPECTUS), ALL
DEALERS THAT BUY, SELL OR TRADE OUR COMMON STOCK, WHETHER OR NOT PARTICIPATING
IN THIS OFFERING, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS IS IN ADDITION
TO THE DEALER'S OBLIGATION TO DELIVER A PROSPECTUS WHEN ACTING AS AN UNDERWRITER
AND WITH RESPECT TO UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.


                                        i
<PAGE>   5

                               PROSPECTUS SUMMARY


     This summary highlights selected information from this prospectus but does
not contain all of the information that may be important to you. This prospectus
includes specific terms of this offering, information about our business and
financial data. We encourage you to read this prospectus in its entirety before
making an investment decision.



                                   WHAT WE DO



     We are a leading provider of wellhead equipment, systems and services used
in the production of oil and gas. Our production equipment and systems are
primarily used at or near the wellhead to separate oil and gas within a
hydrocarbon stream and to remove contaminants. Separation and decontamination at
the wellhead are necessary to meet the specifications of transporters and end
users. Our products and services are used in onshore and offshore fields in most
major oil and gas producing regions in the world. On a pro forma basis, after
giving effect to our acquisition of The Cynara Company (Cynara), our revenues
and EBITDA for the twelve months ended December 31, 1998 were approximately
$213.7 million and $9.7 million. For the six months ended June 30, 1999, our
revenues and EBITDA were approximately $86.2 million and $5.0 million.



     We design and manufacture a diverse line of production equipment,
including:



     - separators, which separate a hydrocarbon stream into oil, gas and water;



     - dehydration and desalting units, which remove water and salt from oil and
       gas;



     - heaters, which prevent solids from forming in gas and reduce the
       viscosity of oil;



     - gas conditioning units and membrane separation systems, which remove
       carbon dioxide and other contaminants from a gas stream;



     - water filtration systems, which remove oil and contaminants from water
       derived from the production process; and



     - control systems, which monitor and control production equipment.



     We offer our products and services as either integrated systems or
individual components. We provide our products and services through four
business segments:



     - traditional production equipment and services, which primarily provides
       standardized components, replacement parts and used components and
       equipment servicing;



     - engineered systems, which primarily provides customized, large scale
       integrated oil and gas production systems;



     - our Canadian operations, which provide traditional production equipment
       and services and engineered systems; and



     - instrumentation and electrical systems, which provides control panels and
       systems that monitor and control oil and gas production.



     We have designed, manufactured and marketed production equipment and
systems for over 70 years. We believe that, among our competitors, we have the
largest installed base of production equipment in the industry. We have achieved
our position in the industry by maintaining our technological leadership,
capitalizing on our strong brand name recognition and offering a broad range of
products and services.


                                        1
<PAGE>   6


                             OUR BUSINESS STRATEGY



     Our strategy for future growth is to expand and improve our market position
through:



     - Focusing on Customer Relationships. We believe that our customers
       increasingly prefer to work on a regular basis with a small number of
       leading suppliers. We believe our size, scope of products, technological
       expertise and service orientation provide us with a competitive advantage
       in establishing preferred supplier relationships with customers. We
       expect to generate growth in revenue and market share by establishing and
       further developing new and existing customer relationships.



     - Providing Turnkey Integrated Systems and Solutions. We believe our
       turnkey design and manufacturing capabilities enable us to reduce our
       customers' production equipment and systems costs and shorten delivery
       times. Our strategy is to be involved in projects early, to provide, as
       among our competitors, the broadest and most complete scope of equipment
       and services and to focus on larger integrated systems. In some
       applications, we also intend to increase the degree of standardization to
       reduce engineering costs and to shorten delivery times.



     - Introducing New Technologies and Products. Since our inception, we have
       developed and acquired leading technologies that enable us to address the
       world market demand for increasingly sophisticated production equipment.
       We will continue to pursue new technologies through licenses,
       acquisitions and internal development.



     - Pursuing Complementary Acquisitions. Our industry is highly fragmented
       and contains many smaller competitors with narrow product lines and
       geographic scope. We intend to continue acquiring companies that provide
       complementary technologies or enhance our ability to offer integrated
       systems.



     - Expanding International Presence. We have operated in various
       international markets for more than 50 years. We intend to continue
       expanding internationally in targeted geographic regions. Currently, our
       most important international opportunity is the future development of
       Southeast Asian gas markets. We believe our proprietary technology for
       the bulk removal of carbon dioxide provides us with a competitive
       advantage in pursuing projects in this region.



                              RECENT DEVELOPMENTS



CYNARA ACQUISITION



     In November 1998, we acquired Cynara because it had proprietary technology
for the bulk removal of carbon dioxide from gas streams. Cynara designs,
constructs, operates and services membrane separation systems utilizing this
technology. A primary market for this application is production from gas wells,
such as those located in Southeast Asia, which have high levels of naturally
occurring carbon dioxide. Another market is production from wells, such as those
located in West Texas, in which carbon dioxide injection is used to enhance the
recovery of oil and gas reserves. This acquisition has expanded our ability to
offer integrated systems and services and complements our gas conditioning
product line.



     In acquiring Cynara, we issued 500,000 shares of our common stock and paid
$5.3 million in cash to the Cynara stockholders. We also repaid $10.1 million of
Cynara's debt and agreed to issue additional shares of our common stock
contingent on the occurrence of specified operational thresholds. Based on
operations through September 30, 1999, approximately 300,000 of these additional
shares have been earned and will be issued on November 30, 1999. Up to a total
of 950,000 more of these additional shares may be earned at March 31, 2000 and
December 31, 2000.


                                        2
<PAGE>   7


PENDING ACQUISITIONS



     We have executed non-binding letters of intent to acquire Porta-Test
International Inc. and Engineering Specialties, Inc. These acquisitions, if
completed, will close subsequent to the completion of this offering.



     Porta-Test International Inc. Porta-Test International Inc. (Porta-Test) is
located in Edmonton, Alberta, Canada. Porta-Test designs and manufactures
centrifugal devices used to enhance the effectiveness of separation equipment.
We expect to close the acquisition of Porta-Test in late 1999.



     For the fiscal year ended June 30, 1999, Porta-Test had revenues of $7.3
million and EBITDA of $(0.1) million. To acquire all the outstanding Porta-Test
capital stock, we have agreed:



     - to pay approximately $5.4 million in cash, net of cash acquired; and



     - to issue our one-year promissory note for approximately $0.7 million.



     Engineering Specialities, Inc. Engineering Specialties, Inc. (ESI) is
located in Covington, Louisiana. ESI designs and manufactures water processing
equipment used to remove oil and contaminants from water produced at the
wellhead, primarily on offshore facilities. We expect to close the acquisition
of ESI in early 2000.



     For the year ended December 31, 1998, ESI had revenues of $3.9 million and
EBITDA of $0.8 million. To acquire all the outstanding ESI capital stock, we
have agreed:



     - to pay approximately $7.3 million in cash, net of cash and marketable
       securities acquired; and



     - to issue options for 25,000 shares of our common stock, exercisable at
       the initial offering price.


                                        3
<PAGE>   8

                                  THE OFFERING


Class A common stock offered(1):



     By us.................  5,000,000 shares



    By the selling
    stockholder............            shares



          Total............            shares



Common stock to be outstanding
  after this offering(1)...  14,287,520 shares(2)



Use of proceeds............  We intend to use the net proceeds of approximately
                             $     million that we will receive from this
                             offering primarily:



                             - to repay outstanding debt; and



                             - for general corporate purposes, including the
                               pending acquisitions.



Proposed New York Stock
   Exchange symbol.........  NTG

- ------------------------------


(1) Our common stock is divided into Class A common stock and Class B common
    stock. The shares to be sold in this offering are Class A common stock. Only
    the former stockholders of Cynara hold Class B common stock. Upon completion
    of this offering, the two classes will have the same rights, except that the
    holders of the Class B common stock will continue to have the rights:



     - to elect one director; and



     - to hold a class vote on any amendment to our charter that would authorize
       additional Class B common stock or would adversely affect their right to
       elect a director.



     On January 1, 2002, the Class B common stock converts automatically into
     Class A common stock to constitute a single class of common stock. In this
     prospectus, references to "our common stock" include both our Class A and
     Class B common stock.



(2) Excludes:



     - up to      shares of Class A common stock if the underwriters exercise
       their option to cover over-allotments;



     - 1,795,947 shares of Class A common stock issuable on exercise of
       outstanding stock options at a weighted average exercise price of $4.40
       per share; and



     - 1,250,000 shares of Class B common stock contingently issuable under the
       terms of our agreement to acquire Cynara.


                                        4
<PAGE>   9

                         SUMMARY FINANCIAL INFORMATION


     The following summary consolidated historical and unaudited pro forma
financial information for the periods and the dates indicated should be read in
conjunction with our consolidated historical and unaudited pro forma financial
statements included elsewhere in this prospectus. In 1998, we changed our fiscal
year-end to December 31 from March 31. The interim data reflects all adjustments
that, in the opinion of our management, are necessary to present fairly the
information for the six-month periods. The unaudited pro forma statement of
operations and other financial data give effect to the acquisition of Cynara as
though it occurred on January 1, 1998. The unaudited historical financial data
presented for the six month period ended June 30, 1999 is not necessarily
indicative of the actual financial results to be expected for the full fiscal
year. See "Selected Consolidated Financial Data" and "Unaudited Condensed Pro
Forma Financial Statements" for more information regarding the historical and
the unaudited pro forma consolidated financial data.



<TABLE>
<CAPTION>
                                                      FISCAL YEAR ENDED    NINE MONTHS     PRO FORMA         SIX MONTHS
                                                          MARCH 31,           ENDED        YEAR ENDED      ENDED JUNE 30,
                                                     -------------------   DECEMBER 31,   DECEMBER 31,   ------------------
                                                       1997       1998         1998         1998(1)        1998      1999
                                                     --------   --------   ------------   ------------   --------   -------
                                                                                                            (UNAUDITED)
                                                                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                  <C>        <C>        <C>            <C>            <C>        <C>
STATEMENT OF OPERATIONS DATA(2):
  Revenues.........................................  $126,657   $202,023     $145,611       $213,651     $106,658   $86,175
  Cost of goods sold...............................   100,803    161,801      115,521        168,816       85,635    65,821
                                                     --------   --------     --------       --------     --------   -------
  Gross profit.....................................    25,854     40,222       30,090         44,835       21,023    20,354
  Selling, general and administrative expense......    23,313     28,553       24,530         35,076       15,274    15,321
  Depreciation and amortization expense............       862      1,322        1,473          4,383          795     2,311
  Interest expense.................................     1,861      2,992        2,215          3,555        1,347     1,673
  Interest cost on postretirement liability(3).....       957      1,048          786          1,048          524       523
  Revaluation loss on postretirement
    liability(3)...................................     1,466        159           53             53           --        --
  Interest income..................................      (116)      (140)        (227)          (227)        (101)      (99)
                                                     --------   --------     --------       --------     --------   -------
  Income (loss) from continuing operations before
    income taxes...................................    (2,489)     6,288        1,260            947        3,184       625
  Income tax provision (benefit)...................      (659)     1,141          608            (30)         594       479
                                                     --------   --------     --------       --------     --------   -------
  Income (loss) from continuing operations.........  $ (1,830)  $  5,147     $    652       $    977     $  2,590   $   146
                                                     ========   ========     ========       ========     ========   =======
  Basic earnings (loss) per share from continuing
    operations.....................................  $  (0.31)  $   0.68     $   0.08       $   0.11     $   0.32   $  0.02
  Diluted earnings (loss) per share from continuing
    operations.....................................     (0.28)      0.64         0.07           0.10         0.29      0.01
  Basic earnings per share.........................      0.67       0.78         0.08           0.11         0.32      0.02
  Diluted earnings per share.......................      0.64       0.73         0.07           0.10         0.29      0.01
  Basic weighted average number of shares of common
    stock outstanding..............................     6,032      7,623        8,243          8,665        8,146     9,151
  Diluted weighted average number of shares of
    common stock outstanding.......................     6,371      8,067        8,942          9,366        8,876     9,824
OTHER DATA:
  Cash flows provided by (used in) operating
    activities.....................................  $  1,059   $  3,113     $ (1,450)                   $  2,569   $ 3,248
  Cash flows provided by (used in) investing
    activities.....................................      (798)   (24,712)     (17,069)                     (2,692)   (1,574)
  Cash flows provided by (used in) financing
    activities.....................................    (1,033)    21,660       20,179                         589    (2,797)
  Earnings before interest, taxes, depreciation and
    amortization (EBITDA)(4).......................     1,075     11,510        5,507          9,706        5,749     5,033
</TABLE>



<TABLE>
<CAPTION>
                                                      MARCH 31,                                 PRO FORMA
                                                  -----------------   DECEMBER 31,   JUNE 30,   JUNE 30,
                                                   1997      1998         1998         1999       1999
                                                  -------   -------   ------------   --------   ---------
                                                                      (IN THOUSANDS)
<S>                                               <C>       <C>       <C>            <C>        <C>
BALANCE SHEET DATA (END OF PERIOD):
  Working capital...............................  $12,551   $24,442     $ 31,466     $ 30,172   $ 53,353
  Net property, plant and equipment.............    6,833     9,332       18,294       18,120     18,120
  Total assets..................................   70,044    95,413      118,412      105,468    122,027
  Long-term debt(5).............................   27,566    33,719       41,777       39,065         --
  Stockholders' equity (deficit)................   (6,737)    5,419       24,190       24,338     79,962
</TABLE>



                                                    (See footnotes on next page)


                                        5
<PAGE>   10

- ------------------------------


(1) The unaudited pro forma statement of operations and other data do not give
    pro forma effect to this offering or to the pending acquisitions of
    Porta-Test and ESI as these acquisitions, if they close, will close after
    this offering. For information regarding the pro forma effect of this
    offering and these pending acquisitions, see "Unaudited Condensed Pro Forma
    Financial Statements."



(2) In June 1997, we distributed our investment in Process Technology Holdings,
    Inc. (PTH) to our stockholders in a tax-free transaction. In accordance with
    generally accepted accounting principles, we account for the results of
    operations of PTH as discontinued operations for all periods presented.
    Accordingly, the net income of PTH is excluded from income (loss) from
    continuing operations in our statements of operations for the periods
    presented.



(3) When we acquired National Tank Company in 1989 from Combustion Engineering,
    Inc., we agreed to provide specified health care and life insurance benefits
    to employees of National Tank Company who retired prior to June 21, 1989.
    These agreements provided that our annual cash costs related to these
    benefits were reimbursed by the seller through June 21, 1999 to the extent
    that they exceeded on an annual basis the lesser of one-third of the cash
    costs in that year or $0.8 million, as adjusted for inflation. For the
    fiscal year ended March 31, 1997, our aggregate cash costs related to these
    benefits were $1.7 million, of which $1.1 million was reimbursed. For the
    fiscal year ended March 31, 1998, our aggregate cash costs were $1.8
    million, of which $1.0 million was reimbursed. For the nine months ended
    December 31, 1998, our aggregate cash costs were $1.6 million, of which $1.1
    million was reimbursed. For the six months ended June 30, 1999, our
    aggregate cash costs related to these benefits were $0.6 million, of which
    $0.4 million was reimbursed. The reimbursement obligation expired on June
    22, 1999, and we no longer receive reimbursement for any portion of these
    cash costs. We currently plan to fund the cash requirements related to these
    retired employee benefits on a current basis.



(4) EBITDA consists of income (loss) from continuing operations plus interest
    expense, interest cost on postretirement benefit liability, income tax
    expense, and depreciation and amortization expense, less interest income.



     EBITDA is not a measurement presented in accordance with generally accepted
     accounting principles. You should not consider it in isolation from or as a
     substitute for net income or cash flow measures prepared in accordance with
     generally accepted accounting principles or as a measure of our
     profitability or liquidity. EBITDA is included as a supplemental disclosure
     because it may provide useful information regarding our ability to service
     debt and to fund capital expenditures.



(5) Includes current portion of long-term debt and revolving lines of credit.


                                        6
<PAGE>   11

                                  RISK FACTORS


     In determining whether to purchase shares of our common stock, you should
carefully consider the risk factors described below and all the information we
have included in this prospectus.



A SUBSTANTIAL OR EXTENDED DECLINE IN OIL OR GAS PRICES COULD RESULT IN LOWER
EXPENDITURES BY THE OIL AND GAS INDUSTRY, THEREBY AFFECTING OUR REVENUE.



     Our business is substantially dependent on the condition of the oil and gas
industry and its willingness to spend capital on the exploration for and
development of oil and gas. A substantial or extended decline in these
expenditures may result in the location of fewer new reserves of oil and gas,
adversely affecting the market for our production equipment and services. The
level of these capital expenditures is generally dependent on the industry's
view of oil and gas prices, which have been characterized by significant
volatility in recent years. Oil and gas prices are affected by numerous factors,
including:



     - the level of exploration activity;



     - worldwide economic activity;



     - interest rates and the cost of capital;



     - environmental regulation;



     - tax policies;



     - political requirements of national governments;



     - coordination by the Organization of Petroleum Exporting Countries (OPEC);



     - the cost of producing oil and gas; and



     - technological advances.



WE MAY LOSE MONEY ON FIXED PRICE CONTRACTS.



     Many of our projects, including larger engineered systems projects, are
performed on a fixed-price basis. We are responsible for all cost overruns,
other than any resulting from change orders. Our costs and any gross profit
realized on our fixed-price contracts will often vary from the estimated amounts
on which these contracts were originally based. This may occur for various
reasons, including:



     - errors in estimates or bidding;



     - changes in availability and cost of labor and material; and



     - variations in productivity from our original estimates.



     These variations and the risks inherent in engineered systems projects may
result in reduced profitability or losses on our projects. Depending on the size
of a project, variations from estimated contract performance can have a
significant impact on our operating results for any particular fiscal quarter or
year.



WE HAVE RELIED AND WE EXPECT TO CONTINUE TO RELY ON A LIMITED NUMBER OF
CUSTOMERS FOR A SIGNIFICANT PORTION OF OUR REVENUES.



     There have been and are expected to be periods where a substantial portion
of our revenues are derived from a single customer or a small group of
customers. We had revenues of $28.3 million (14% of our total revenues) from the
BP Exploration (Alaska), Inc. alliance project for fiscal 1998. On July 1, 1999,
we were awarded a $73.0 million contract to supply gas treating and conditioning
equipment to a project in Southeast Asia. The project is a joint venture under
the control of the Carigali-Triton Operating Company (CTOC), which is owned 50%
by Petronas, the Malaysian National Oil Company and 50% by ARCO and Triton. The
project is located in the Gulf of Thailand. Although this project has not yet

                                        7
<PAGE>   12


produced more than 10% of our revenues in any period, it will take approximately
two years to complete and is expected to comprise more than 10% of annual
billings during that period. A prolonged failure of this customer to fulfill its
contractual obligations to us or a termination of the related project could have
a material adverse effect on our results of operations and financial condition.



OUR ABILITY TO ATTRACT AND RETAIN SKILLED LABOR IS CRUCIAL TO THE PROFITABILITY
OF OUR FABRICATION AND SERVICES ACTIVITIES.



     Our ability to remain profitable depends in part on our ability to attract
and retain skilled manufacturing workers, equipment operators, engineers and
other technical personnel. Our ability to expand our operations, particularly in
the Gulf Coast area, depends primarily on our ability to increase our labor
force. Demand for these workers is currently high and the supply is extremely
limited. We believe that our wage rates are competitive and that our
relationship with our skilled labor force is good. A significant increase in the
wages paid by competing employers could, nevertheless, result in a reduction in
our skilled labor force, increases in the rates of wages we must pay or both. If
this were to occur, the immediate effect on us would be a reduction in our
profits and the extended effect would be diminishment of our production capacity
and profitability and impairment of our growth potential.



A THIRD PARTY WILL NO LONGER REIMBURSE US FOR A PORTION OF OUR COSTS OF
SPECIFIED EMPLOYEE HEALTH AND LIFE INSURANCE.



     We are required by contract to provide health care and life insurance
benefits to our former employees who retired prior to June 21, 1989. The
contract also provided for partial reimbursement of our annual cash costs
related to these benefits by a third party. For the fiscal years ended March 31,
1997 and 1998, our cash costs related to these benefits were $1.7 million and
$1.8 million. In fiscal 1997, we were reimbursed $1.1 million, and in fiscal
1998 we were reimbursed $1.0 million. For the nine months ended December 31,
1998, our cash costs were $1.6 million, of which we were reimbursed $1.1
million. For the six months ended June 30, 1999, our aggregate cash costs
related to these benefits were $0.6 million, of which $0.4 million was
reimbursed. The reimbursement obligation expired on June 22, 1999, and we no
longer receive reimbursement for any portion of these cash costs. At June 30,
1999, there were 536 retirees and surviving spouses and 323 dependents covered
by the specified postretirement benefits obligations. As a result of the
transaction described in "Related Party Transactions -- Capricorn I
Subsidiaries -- Tyler" these numbers will increase to 629 and 352, respectively.



     In accounting for this liability, we evaluate annually the estimated
liability, discounted to present value, of the unreimbursable portion of these
benefits. We recognize and report in our financial statements gains and losses
from these evaluations. For the fiscal years ended March 31, 1997 and 1998, we
reported losses on revaluation of postretirement employee liability of $1.5
million and $0.2 million. For the nine months ended December 31, 1998, we
reported a loss of $0.1 million.



     We cannot assure you that the costs of the actual benefits will not exceed
those projected or that future actuarial assessments of the extent of those
costs will not exceed the current assessment. Under those circumstances, the
adjustments required to be made to our recorded liability for these benefits
could have a material adverse effect on our results of operations and financial
condition.



THE LOSS OF ONE OR MORE OF OUR CUSTOMER RELATIONSHIPS COULD MATERIALLY HARM OUR
BUSINESS AND EARNINGS.



     We expect to continue our practice of entering into relationships with
major oil companies and large independent producers. In these relationships, we
are typically designated as the preferred supplier of equipment or services or
both. Many of these relationships are nonbinding arrangements in which both
parties undertake to satisfy the objectives of the relationship. They may be
characterized as:



     - blanket purchase orders for specified amounts of standardized equipment;



     - project-specific integrated relationships; or



     - ongoing informal working relationships.

                                        8
<PAGE>   13


     The loss of one or more of these relationships could have a material
adverse effect on our business, results of operations and financial condition.



OUR INTERNATIONAL OPERATIONS MAY EXPERIENCE INTERRUPTIONS DUE TO POLITICAL AND
ECONOMIC RISKS.



     We operate our business and market our products and services in oil and gas
producing areas throughout the world. We are, therefore, subject to the risks
customarily attendant to international operations and investments in foreign
countries. These risks include:



     - nationalization;



     - expropriation;



     - war and civil disturbances;



     - restrictive actions by local governments;



     - limitations on repatriation of earnings;



     - changes in foreign tax laws; and



     - changes in currency exchange rates.



     The occurrence of any of these risks could have an adverse effect on
regional demand for our products and services or our ability to provide them. An
interruption of our international operations could have a material adverse
effect on our results of operations and financial condition.



     A portion of our sales are made in Southeast Asia. The currencies of
several countries in Southeast Asia underwent significant devaluations against
the United States dollar in 1997 and early 1998. The devaluation of these
currencies and the related consequences to the economies in these countries have
adversely affected economic growth in the region. To the extent the economies of
countries in Southeast Asia continue to be adversely affected, we cannot assure
you that the demand for our products and services in the region will continue at
historical or anticipated levels.



OUR PENDING ACQUISITIONS THAT ARE INCLUDED IN OUR PRO FORMA FINANCIAL STATEMENTS
ARE SUBJECT TO THE RISK THAT THEY MAY NOT BE CONSUMMATED.



     Our Unaudited Condensed Pro Forma Financial Statements give effect to the
completion of this offering and the pending acquisitions. With respect to the
pending acquisitions, however, we have only entered into nonbinding letters of
intent. Accordingly, the completion of each of these transactions is subject to
numerous conditions, including the negotiation and execution of definitive
agreements and the fulfillment or waiver of the conditions to closing to be
included in the agreements. These conditions are expected to include such
matters as confirmation by each party of its representations and warranties in
those agreements, fulfillment of its covenants to be fulfilled by closing and
the absence of any material adverse change in the financial condition or results
of operations of the party we intend to acquire. We can not assure you that
these conditions will be fulfilled or that these acquisitions will be completed.
Moreover, even if they are completed, the pro forma financial statements are for
illustrative purposes only and are not necessarily indicative of the financial
results that would have been achieved if the acquisitions had been completed.



FUTURE ACQUISITIONS MAY BE DIFFICULT TO INTEGRATE, DISRUPT OUR BUSINESS AND
ADVERSELY AFFECT OUR OPERATING RESULTS.



     We intend to continue our practice of acquiring other companies, assets and
product lines that complement or expand our existing business. Each acquisition,
however, involves a number of risks. These risks include:



     - the diversion of our management's attention to the assimilation of the
       operations and personnel of the acquired business;

                                        9
<PAGE>   14


     - possible adverse effects on our operating results during the integration
       process; and



     - the possible inability to achieve the intended objectives of the
       combination.



     In pursuit of our acquisition strategy, we may seek to finance an
acquisition through borrowings under credit facilities or the issuance of new
debt or equity securities. If we should proceed with a relatively large cash
acquisition, we could deplete a substantial portion of our financial resources
to the possible detriment of our other operations. Any future acquisitions could
also dilute the equity interests of our stockholders, require us to write off
assets for accounting purposes or create other undesirable accounting issues,
such as significant expenses for amortization of goodwill or other intangible
assets.



OUR INSURANCE POLICIES MAY NOT COVER ALL PRODUCTS LIABILITY CLAIMS.



     Some of our products are used in potentially hazardous production
applications that can cause:



     - personal injury;



     - loss of life;



     - damage to property, equipment or the environment; and



     - suspension of operations.



     We maintain insurance coverage against these risks in accordance with
normal industry practice. This insurance will not protect us against liability
for some kinds of events, including specified events involving pollution, or
against losses resulting from business interruption. We cannot assure you that
our insurance will be adequate in risk coverage or policy limits to cover all
losses or liabilities that we may incur. Moreover, we cannot assure you that we
will be able in the future to maintain insurance at levels of risk coverage or
policy limits that we deem adequate. Any future damages caused by our products
or services that are not covered by insurance or are in excess of policy limits
could have a material adverse effect on our business, results of operations and
financial condition.



LIABILITY TO CUSTOMERS UNDER WARRANTIES MAY MATERIALLY AND ADVERSELY AFFECT OUR
EARNINGS.



     We typically provide warranties as to the proper operation and conformance
to specifications of the equipment we manufacture. Failure of this equipment to
operate properly or to meet specifications may increase our costs by requiring
additional engineering resources, replacement of parts and equipment or service
or monetary reimbursement to a customer. Our warranties are often backed by
letters of credit. At June 30, 1999, we had provided to our customers
approximately $1.9 million in letters of credit related to warranties. We have
in the past received warranty claims and we expect to continue to receive them
in the future. To the extent that we should incur warranty claims in any period
substantially in excess of our warranty reserve, our results of operations and
financial condition could be materially and adversely affected.



WE MAY INCUR SUBSTANTIAL COSTS TO COMPLY WITH OUR ENVIRONMENTAL OBLIGATIONS.



     In our equipment fabrication and refurbishing operations, we generate and
manage hazardous wastes. These include:



     - waste solvents;



     - waste paint;



     - waste oil;



     - washdown wastes; and



     - sandblasting wastes.


                                       10
<PAGE>   15


     We attempt to identify and address environmental issues before acquiring
properties and to utilize industry accepted operating and disposal practices
regarding the management and disposal of hazardous wastes. Nevertheless, either
we or others may have released hazardous materials on our properties or in other
locations where hazardous wastes have been taken for disposal. We may be
required by federal or state environmental laws to remove hazardous wastes or to
remediate sites where they have been released. We could also be subjected to
civil and criminal penalties for violations of those laws. Our costs to comply
with these laws may adversely affect our earnings.



OUR QUARTERLY SALES AND EARNINGS MAY FLUCTUATE SIGNIFICANTLY.



     A substantial amount of our revenues are derived from significant contracts
which are often performed over periods of two to six quarters. As a result, our
revenues and earnings may fluctuate significantly from quarter to quarter,
depending upon our ability to replace existing contracts with new orders and
upon the extent of any delays in completing existing projects.



TERMINATION OF A FEW LARGE PROJECTS COULD SUBSTANTIALLY REDUCE OUR BACKLOG.



     Our backlog is based on awarded projects. Awarded projects include those
projects on which customers have authorized us to begin work or to purchase
materials. Each project that we currently include in our backlog is subject to
change or termination at the customer's election. Exercise by our customers of
their rights to change or terminate projects could change or reduce the amount
of backlog currently reported. The decrease could be substantial in the case of
the termination of a few large projects. A decrease in backlog may adversely
affect our future earnings and financial condition.



THE LOSS OF ANY MEMBER OF OUR SENIOR MANAGEMENT COULD ADVERSELY AFFECT OUR
RESULTS OF OPERATIONS.



     Our success depends heavily on the continued services of our senior
management. Our senior management consists of a small number of individuals
relative to other comparable or larger companies. These are the individuals who
possess our bidding, procurement, transportation, logistics, planning, project
management, risk management and financial skills. If we lost or suffered an
extended interruption in the services of one or more of our senior officers, our
results of operations could be adversely affected. Moreover, we cannot assure
you that we will be able to attract and retain qualified personnel to succeed
members of our senior management. We do not maintain key man life insurance.



COMPETITION COULD RESULT IN REDUCED PROFITABILITY AND LOSS OF MARKET SHARE.



     Contracts for our products and services are generally awarded on a
competitive basis, and competition is intense. The most important factors
considered by our customers in awarding contracts include:



     - the availability and capabilities of our equipment;



     - our ability to meet the customer's delivery schedule;



     - our price;



     - our reputation;



     - our experience; and



     - our safety record.



Historically, the existence of overcapacity in our industry has caused increased
price competition in many areas of our business.


                                       11
<PAGE>   16


     In addition, we may encounter obstacles in our international operations
that impair our ability to compete in individual countries. These obstacles may
include:



     - subsidies granted in favor of local companies;



     - import duties and fees imposed on us and other foreign operators;



     - taxes imposed on foreign operators;



     - lower wage rates in foreign countries; and



     - fluctuations in the exchange value of the United States dollar compared
       with the local currency.



     Any or all these factors could adversely affect our ability to compete and
thus adversely affect our results of operations.



THE INTERNAL REVENUE SERVICE MAY CHALLENGE OUR TAX POSITION REGARDING THE
SPIN-OFF OF PROCESS TECHNOLOGY HOLDINGS, INC.



     Prior to June 1997, we owned all the outstanding stock of Process
Technology Holdings, Inc. (PTH). In connection with a financing in June 1997, we
distributed all of that stock to our sole stockholder at the time, Capricorn
Investors, L.P. (Capricorn I). At that time, we obtained an opinion of counsel
to the effect that the distribution would be not be subject to federal income
tax either to us or Capricorn I. Tax-free treatment of the distribution depends,
in part, on the underlying facts and circumstances at the time of the
distribution. We cannot assure you that the IRS will agree with our
interpretation and that of our counsel of those facts and circumstances. If the
IRS were to challenge the tax-free treatment of the distribution and to prevail,
we would recognize a gain for federal income tax purposes with respect to the
distribution. The amount of the gain would be equal to the excess of the fair
market value of the PTH stock at the time of the distribution over our tax basis
in that stock. The resulting tax could have a material adverse effect on our
results of operations and financial condition. See "Related Party
Transactions -- Capricorn I Subsidiaries -- Tyler."



CONTROL OF OUR COMPANY BY THE EXISTING STOCKHOLDERS MAY DISCOURAGE TAKEOVER
BIDS.



     As of August 31, 1999, Capricorn I and Capricorn Investors II, L.P.
(Capricorn II) owned 59.9% and 33.2% of our outstanding common stock.
Immediately upon completion of this offering, they will own      % and      %,
which percentages will decline to      % and      % if the underwriters exercise
fully their over-allotment option. As a result, one of our directors, Herbert S.
Winokur, Jr., through his control of Capricorn I and Capricorn II, will have
sufficient voting power to control our direction and policies. He will also be
able to determine the outcome of any matter requiring stockholder approval,
including:



     - a business combination involving a merger, consolidation or sale of all
       or substantially all of our assets; and



     - the election of directors of our company.



He will also be able to prevent a change in control of our company except on
terms acceptable to him.



     In addition, Mr. Winokur will be able to exercise the contractual rights of
Capricorn I and Capricorn II to nominate two of our directors so long as
Capricorn I and Capricorn II together own at least 20% of our common stock.



     We understand that Capricorn I intends in the near future to distribute to
its partners all the shares of our common stock that it owns. Even after that
distribution, however, Mr. Winokur is expected to be able to control the
direction and policies of our company through his direct holdings of our common
stock and his control of Capricorn II.


                                       12
<PAGE>   17


OUR RIGHTS PLAN AND THE DELAWARE LAW MAY DISCOURAGE ACQUISITION BIDS.



     Our board of directors has adopted a stockholders' rights plan. Under this
plan, we have issued preferred stock purchase rights as a dividend on our
outstanding common stock and on any other common stock issued after adoption of
the plan. This will include the shares issued by us in this offering. These
rights are not currently exercisable. They would become exercisable, however, if
someone acquired or offered to acquire specified amounts of common stock.



     Moreover, a provision of Delaware law that is applicable to us could delay
or make difficult a merger, tender offer or proxy contest involving us. This
provision also becomes applicable if someone acquires or offers to acquire a
specified amount of our common stock.



     The rights and the provisions of the Delaware law have certain
anti-takeover effects. The rights will cause substantial dilution to a person or
group that attempts to acquire us without the approval of our board of
directors. The rights and the provisions of Delaware law may deter a potential
unfriendly offer or other effort to gain control of our company that is not
approved by our board of directors. This may deprive the stockholders of
opportunities to sell shares of our common stock at prices higher than those
prevailing in the market. Neither the rights nor this provision of Delaware law
should, however, interfere with any merger or other business combination that is
approved by our board of directors.



PROVISIONS OF OUR CHARTER AND BYLAWS MAY ALSO DISCOURAGE ACQUISITION BIDS.



     Our board of directors has the authority to issue up to 5,000,000 shares of
preferred stock. The board of directors can fix the terms of the preferred stock
without any action on the part of our stockholders. Our board has designated a
series of 500,000 shares of preferred stock that is subject to issuance under
our rights plan. The issuance of shares of preferred stock may delay or prevent
a change in control transaction. This may adversely affect the market price and
interfere with the voting and other rights of our common stock. We have no
current plans to issue any shares of preferred stock.



     Our charter and bylaws contain the following anti-takeover provisions:



     - only one of the three classes of directors is elected each year;



     - the ability of our stockholders to remove directors without cause is
       precluded;



     - our stockholders may not act by written consent in lieu of a meeting
       unless both the subject matter of the consent and the taking of action by
       written consent have been approved by our board;



     - a written request signed by the holders of at least 10% of our
       outstanding common stock is required for the stockholders to call a
       special meeting of stockholders; and



     - advance notice is required for the stockholders to nominate directors or
       submit proposals for consideration at stockholder meetings.



These provisions could discourage potential acquisition proposals and could
delay or prevent a change in control transaction. As a result, they may limit
the price that some investors might be willing to pay in the future for shares
of our common stock. These provisions may also impede changes in our management.



OUR STOCK PRICE MAY BE VOLATILE BECAUSE OUR SHARES HAVE NOT PREVIOUSLY BEEN
TRADED PUBLICLY.



     Prior to this offering, there has been no public market for our common
stock. We intend to apply to list our common stock on the NYSE. We cannot assure
you, however, that an active trading market for the common stock will develop or
that, if it develops, it will be sustained.



     The initial public offering price of our common stock will be determined
through negotiations between our management and the selling stockholder on one
hand and the representatives of the underwriters on the other. The initial
public offering price may bear no relationship to the price at which our common


                                       13
<PAGE>   18


stock will trade after the offering. Following the offering, prices for our
common stock may be influenced by a number of factors. These include:



     - the liquidity of the market for our common stock;



     - investor perceptions of us;



     - investor perceptions of the energy services industry; and



     - general economic conditions.



THE LAPSE OF LEGAL RESTRICTIONS ON THE SALE OF SHARES COULD AFFECT OUR STOCK
PRICE AND DILUTE YOUR STOCK OWNERSHIP.



     Sales of substantial amounts of our common stock in the public market by
insiders following the offering, or the perception that these sales may occur,
could cause the market price of our common stock to fall. After the offering,
assuming the underwriters do not exercise their over-allotment option, there
will be outstanding 14,287,520 shares of our common stock. If the underwriters
exercise their over-allotment option, this number will increase to
shares. Of these,           shares will be held as follows:



<TABLE>
<CAPTION>
STOCKHOLDER                                            NUMBER OF SHARES
<S>                                                    <C>
Capricorn I..........................................
Capricorn II.........................................     3,087,021
Former stockholders of Cynara........................       500,000*
Nathaniel A. Gregory.................................       136,832
</TABLE>


- ---------------


* Based on operations through September 30, 1999, approximately 300,000
  additional shares have been earned and will be issued on November 30, 1999. Up
  to a total of 950,000 additional shares may be earned at March 31, 2000 and
  December 31, 2000.



     The holding periods under Rule 144 with respect to the shares of our common
stock held by Capricorn I, Capricorn II and the former stockholders of Cynara
have already expired or will have expired before the scheduled expiration of the
lock-up agreements to be entered into by our directors, officers and specified
shareholders. These lock-up agreements are scheduled to expire 180 days after
the date of this prospectus. Mr. Gregory may sell his shares under Rule 144
after July 12, 2000.



PURCHASERS IN THIS OFFERING WILL INCUR IMMEDIATE AND SUBSTANTIAL DILUTION.



     The net tangible book value of shares of our common stock that you purchase
in this offering will be substantially less than the price that you pay for
them. This immediate and substantial dilution in the net tangible book value of
the shares you purchase will be $     assuming an initial public offering price
of $     per share. If and to the extent that outstanding common stock options
are exercised after the offering, there may be further dilution in the net
tangible book value of your shares of common stock.



A CHANGE IN THE ESTIMATED LIFE OF GOODWILL COULD REDUCE OUR EARNINGS.



     Our balance sheet at June 30, 1999, had an amount called "goodwill" that
represented 15.8% of assets and 68.4% of stockholders' equity. Goodwill is
recorded when we pay more for a business than the fair value of the tangible and
separately measurable intangible net assets. GAAP requires us to amortize this
and all other intangible assets over the periods we benefit from those assets.
The amortization periods for our acquisitions to date are either 20 years or 40
years. We evaluate the useful life of all our assets on an ongoing basis. If we
were to assign a shorter life to a material portion of the goodwill, earnings
reported in prospective periods would be reduced. Earnings in later years could
be significantly affected if management determined then that the remaining
balance of goodwill was impaired.


                                       14
<PAGE>   19


           CAUTIONARY STATEMENT REGARDING FORWARD LOOKING STATEMENTS



     This prospectus, including the sections entitled "Summary," "Risk Factors,"
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and "Business," contains forward-looking statements. These
statements relate to future events or our future financial performance and
involve known and unknown risks and uncertainties. These factors may cause our
company's or our industry's actual results, levels of activity, performance or
achievements to be materially different from those expressed or implied by the
forward-looking statements. These risks and other factors include those listed
under "Risk Factors" and elsewhere in this prospectus. In some cases, you can
identify forward-looking statements by terminology such as "may," "will,"
"should," "expects," "intends," "plans," "anticipates," "believes," "estimates,"
"predicts," "potential," "continue," or the negative of these terms or other
comparable terminology.



     These statements are only predictions. Although we believe that the
expectations reflected in the forward-looking statements are reasonable, we
cannot guarantee future results, levels of activity, performance or
achievements. Moreover, neither we nor any other person assumes responsibility
for the accuracy or completeness of these forward-looking statements.


                                USE OF PROCEEDS


     We estimate that the net proceeds from the sale of the 5,000,000 shares of
common stock that we are selling in this offering will be approximately
$          million ($          if the underwriters fully exercise their
over-allotment option.) This is based on a public offering price of $     per
share and after deducting the underwriting discount and estimated offering
expenses payable by us. We will not receive any proceeds from the sale of shares
being sold by the selling stockholder.



     We intend to use the net proceeds that we receive from this offering as
follows:



     - to repay all of our outstanding indebtedness under our credit facilities
       (approximately $39.8 million as of August 31, 1999); and



     - to apply the balance to general corporate purposes, including
       approximately $12.7 million to fund the pending acquisitions of
       Porta-Test and ESI.



     Pending use for these purposes, we plan to invest the net proceeds in
short-term investment-grade securities.



     The weighted average interest rate for outstanding borrowings under our
credit facilities as of August 31, 1999 was 7.9%. The term loan portion of one
of our credit facilities is payable in quarterly installments through November
2003. The revolving portion of that credit facility matures on November 30,
2001. The other credit facility matures on July 23, 2002. We used borrowings
under our credit facilities to fund acquisitions and capital expenditures and
for general corporate purposes.


                                       15
<PAGE>   20

                                DIVIDEND POLICY


     We do not intend to declare or pay any dividends on our common stock in the
foreseeable future. Instead, we intend to retain any future earnings for use in
our business.



     Our board will determine the payment of future dividends on our common
stock and the amount of any such dividends in light of:



     - any applicable contractual restrictions limiting our ability to pay
       dividends;



     - our earnings;



     - our financial condition;



     - our ability to fund our capital requirements; and



     - other factors our board deems relevant.



     Currently, our bank credit facilities restrict the amount of dividends and
other distributions that our operating subsidiaries may pay to us. Since we are
a holding company, these restrictions have the practical effect of precluding us
from paying dividends on our common stock.


                                       16
<PAGE>   21

                                    DILUTION


     Our net tangible book value at June 30, 1999 was $0.84 per share of our
common stock. Net tangible book value per share represents our total tangible
assets reduced by our total liabilities and divided by the number of shares of
common stock outstanding. Dilution in net tangible book value per share
represents the difference between the amount per share that you pay in this
offering and the net tangible book value per share immediately after this
offering.



     After giving effect to the receipt of the proceeds from our sale of
5,000,000 shares at a public offering price of $     per share, our net tangible
book value per share at June 30, 1999 would have been approximately $          .
This represents an immediate increase in net tangible book value per share of
$          to existing stockholders and an immediate decrease in net tangible
book value per share of $          to you. The following table illustrates this
dilution.



<TABLE>
<S>                                                            <C>        <C>
Assumed public offering price per share.....................              $
  Net tangible book value per share at June 30, 1999........   $   0.84
  Increase per share attributable to new investors..........
                                                               --------
Net tangible book value per share after this offering.......   $
                                                                          --------
Dilution per share to new investors.........................              $
                                                                          ========
</TABLE>



     The following table sets forth as of June 30, 1999 the differences between
the amounts paid by existing stockholders and new investors with respect to:



     - the number of shares of our common stock purchased from us;



     - the total consideration paid; and



     - the average price per share paid by existing stockholders and new
       investors, before deducting underwriters' commissions and our expenses
       and assuming a public offering price of $     per share.



<TABLE>
<CAPTION>
                                            SHARES PURCHASED    TOTAL CONSIDERATION
                                            -----------------   --------------------   AVERAGE PRICE
                                             NUMBER       %       AMOUNT        %        PER SHARE
<S>                                         <C>         <C>     <C>           <C>      <C>
Existing stockholders.....................  9,150,688           37,747,000                 $4.13
New investors.............................
          Total...........................
</TABLE>



     The above table excludes 1,795,947 shares of our common stock reserved at
September 30, 1999 for issuance under existing stock options and up to 1,250,000
shares contingently issuable under the terms of our agreement to acquire Cynara.
You will experience further dilution if those additional shares of our common
stock are issued.


                                       17
<PAGE>   22

                                 CAPITALIZATION


     The following table sets forth our capitalization at June 30, 1999 and as
adjusted as of that date to reflect the sale of 5,000,000 shares of our common
stock in this offering and the application of the estimated net proceeds from
the offering. You should read the information below in conjunction with "Use of
Proceeds," "Management's Discussion and Analysis of Financial Condition and
Results of Operations" and our consolidated financial statements.



<TABLE>
<CAPTION>
                                                                   JUNE 30, 1999
                                                              -----------------------
                                                                              AS
                                                               ACTUAL    ADJUSTED(1)
                                                              --------   ------------
                                                              (DOLLARS IN THOUSANDS)
<S>                                                           <C>        <C>
Cash........................................................  $ 1,428      $16,882
                                                              =======      =======
Current portion of long-term debt and revolving credit
  facility..................................................  $ 6,622      $    --
Long-term debt (excluding current portion)..................   32,443           --
Stockholders' equity:
  Preferred Stock, par value $0.01 per share, 5,000,000
     shares authorized; no shares outstanding...............       --           --
  Class A Common Stock, par value $0.01 per share,
     45,000,000 shares authorized; 8,650,688 and 13,650,688
     shares outstanding, respectively(2)(3).................       86          136
  Class B Common Stock, par value $0.01 per share, 5,000,000
     shares authorized; 500,000 shares outstanding(2)(4)....        5            5
  Additional paid-in capital................................   38,651       95,242
  Accumulated deficit.......................................   (8,672)      (9,689)
Treasury stock, 470,188 shares at cost......................   (4,550)      (4,550)
Accumulated other comprehensive loss........................   (1,182)      (1,182)
                                                              -------      -------
          Total stockholders' equity........................   24,338       79,962
                                                              -------      -------
          Total capitalization..............................  $63,403      $79,962
                                                              =======      =======
</TABLE>


- ------------------------------


(1) Does not reflect adjustments related to the pending acquisitions of
    Porta-Test and ESI as they will not close, if at all, until after this
    offering. The estimated cash required for the pending acquisitions is $12.7
    million.



(2) The shares to be sold in this offering are Class A common stock. Only the
    former stockholders of Cynara hold Class B common stock. Upon completion of
    this offering, the two classes will have the same rights, except that the
    holders of the Class B common stock will continue to have the rights:



     - to elect one director; and



     - to hold a class vote on any amendment to our charter that would authorize
       additional Class B common stock or would adversely affect their rights to
       elect a director.



     On January 1, 2002, the Class B common stock converts automatically into
     Class A common stock to constitute a single class of common stock.



(3) Excludes the following related to Class A common stock:



     - 136,832 shares issued to Mr. Gregory in July 1999 as discussed under
       "Management -- Employment Agreement."



     - 1,795,947 shares issuable at September 30, 1999 on exercise of
       outstanding stock options at a weighted average exercise price of $4.40
       per share; and



(4) Excludes 1,250,000 shares of Class B common stock contingently issuable
    under the terms of our agreement to acquire Cynara.


                                       18
<PAGE>   23

                      SELECTED CONSOLIDATED FINANCIAL DATA


     The selected consolidated financial data presented below for each of the
four fiscal years ended March 31, 1998 and the nine months ended December 31,
1998 has been derived from our audited consolidated financial statements. The
data for the six month periods ended June 30, 1998 and 1999 has been derived
from our unaudited interim consolidated financial statements, which include all
adjustments, consisting of normal recurring adjustments, necessary for a fair
presentation of our financial position and results of operations for these
periods. Operating results for the six months ended June 30, 1999 are not
necessarily indicative of the results that may be expected for the entire year.
This data should be read in conjunction with our consolidated financial
statements and "Management's Discussion and Analysis of Financial Condition and
Results of Operations" included elsewhere in this prospectus.



<TABLE>
<CAPTION>
                                                                                                        SIX MONTHS
                                                                                     NINE MONTHS          ENDED
                                                   YEAR ENDED MARCH 31,                 ENDED            JUNE 30,
                                         -----------------------------------------   DECEMBER 31,   ------------------
                                           1995       1996       1997       1998         1998         1998      1999
                                         --------   --------   --------   --------   ------------   --------   -------
                                                                                                       (UNAUDITED)
                                                             (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                      <C>        <C>        <C>        <C>        <C>            <C>        <C>
STATEMENT OF OPERATIONS DATA(1):
  Revenues.............................  $109,909   $112,724   $126,657   $202,023     $145,611     $106,658   $86,175
  Cost of goods sold...................    88,322     91,530    100,803    161,801      115,521       85,635    65,821
                                         --------   --------   --------   --------     --------     --------   -------
  Gross profit.........................    21,587     21,194     25,854     40,222       30,090       21,023    20,354
  Selling, general and administrative
    expense............................    22,483     21,754     23,313     28,553       24,530       15,274    15,321
  Restructuring charges(2).............       984        776         --         --           --           --        --
  Depreciation and amortization
    expense............................       903        731        862      1,322        1,473          795     2,311
  Interest expense.....................     3,358      2,422      1,861      2,992        2,215        1,347     1,673
  Interest cost on postretirement
    liability(3).......................     1,064        932        957      1,048          786          524       523
  Revaluation (gain) loss on
    postretirement liability(3)........    (4,781)     2,273      1,466        159           53           --        --
  Interest income......................    (1,692)      (336)      (116)      (140)        (227)        (101)      (99)
  Gain on sale of investment(4)........   (10,124)    (6,320)        --         --           --           --        --
                                         --------   --------   --------   --------     --------     --------   -------
  Income (loss) from continuing
    operations before income taxes.....     9,392     (1,038)    (2,489)     6,288        1,260        3,184       625
  Income tax provision (benefit).......     4,462       (528)      (659)     1,141          608          594       479
                                         --------   --------   --------   --------     --------     --------   -------
  Income (loss) from continuing
    operations.........................  $  4,930   $   (510)  $ (1,830)  $  5,147     $    652     $  2,590   $   146
                                         ========   ========   ========   ========     ========     ========   =======
  Basic earnings (loss) per share from
    continuing operations..............  $   0.76   $  (0.08)  $  (0.31)  $   0.68     $   0.08     $   0.32   $  0.02
  Diluted earnings (loss) per share
    from continuing operations.........      0.76      (0.08)     (0.28)      0.64         0.07         0.29      0.01
  Basic earnings per share.............      0.81       0.05       0.67       0.78         0.08         0.32      0.02
  Diluted earnings per share...........      0.81       0.05       0.64       0.73         0.07         0.29      0.01
  Basic weighted average shares of
    common stock.......................     6,502      6,056      6,032      7,623        8,243        8,146     9,151
  Diluted weighted average shares of
    common stock.......................     6,502      6,243      6,371      8,067        8,942        8,876     9,824
OTHER DATA:
  Cash flows provided by (used in)
    operating activities...............  $ (5,160)  $ (4,416)  $  1,059   $  3,113     $ (1,450)    $  2,569   $ 3,248
  Cash flows provided by (used in)
    investing activities...............    15,457      9,544       (798)   (24,712)     (17,069)      (2,692)   (1,574)
  Cash flows provided by (used in)
    financing activities...............    (8,547)    (7,671)    (1,033)    21,660       20,179          589    (2,797)
  EBITDA(5)............................    13,025      2,711      1,075     11,510        5,507        5,749     5,033
</TABLE>


                                       19
<PAGE>   24


<TABLE>
<CAPTION>
                                                                 MARCH 31,
                                                   -------------------------------------   DECEMBER 31,    JUNE 30,
                                                    1995      1996      1997      1998         1998          1999
                                                   -------   -------   -------   -------   ------------   -----------
                                                                                                          (UNAUDITED)
                                                                             (IN THOUSANDS)
<S>                                                <C>       <C>       <C>       <C>       <C>            <C>
BALANCE SHEET DATA (END OF PERIOD):
  Working capital................................  $ 3,445   $ 3,102   $12,551   $24,442     $ 31,466      $ 30,172
  Net property, plant and equipment..............    6,506     6,660     6,833     9,332       18,294        18,120
  Total assets...................................   67,105    57,349    70,044    95,413      118,412       105,468
  Long-term debt(6)..............................   25,649    23,245    27,566    33,719       41,777        39,065
  Stockholders' equity (deficit).................   (4,672)   (8,866)   (6,737)    5,419       24,190        24,338
</TABLE>


- ------------------------------


(1) In June 1997, we distributed our investment in PTH to our stockholders in a
    tax-free transaction. In accordance with generally accepted accounting
    principles, we account for the results of operations of PTH as discontinued
    operations for all periods presented. Accordingly, the net income of PTH is
    excluded from income (loss) from continuing operations in our income
    statements for the periods presented.



(2) We have recorded charges of:



     - $1.0 million in fiscal 1995 consisting of relocation, severance benefits
       and recruiting costs related to the relocation of engineering and
       administrative personnel to corporate headquarters; and



     - $0.8 million in fiscal 1996, of which $0.5 million related to the closing
       of our Singapore operations and $0.3 million related to recruiting and
       employee relocation expenses.



(3) When we acquired National Tank Company in 1989 from Combustion Engineering,
    Inc., we agreed to provide specified health care and life insurance benefits
    to employees of National Tank Company who retired prior to June 21, 1989.
    These agreements provided that our annual cash costs related to these
    benefits were reimbursed by the seller through June 21, 1999 to the extent
    that they exceeded on an annual basis the lesser of one-third of the cash
    costs in that year or $0.8 million, as adjusted for inflation. For the
    fiscal year ended March 31, 1997, our aggregate cash costs related to these
    benefits were $1.7 million, of which $1.1 million was reimbursed. For the
    fiscal year ended March 31, 1998, our aggregate cash costs were $1.8
    million, of which $1.0 million was reimbursed. For the nine months ended
    December 31, 1998, our aggregate cash costs were $1.6 million, of which $1.1
    million was reimbursed. For the six months ended June 30, 1999, our
    aggregate cash costs related to these benefits were $0.6 million, of which
    $0.4 million was reimbursed. The reimbursement obligation expired on June
    22, 1999, and we no longer receive reimbursement for any portion of these
    cash costs. We currently plan to fund the cash requirements related to these
    retired employee benefits on a current basis.



(4) In fiscal 1995, we sold a portion of our interest in a subsidiary for a gain
    of $10.1 million, and in fiscal 1996, we completed the sale of our remaining
    interest in that subsidiary for a gain of $6.3 million. See "Management's
    Discussion and Analysis of Financial Condition and Results of
    Operations -- History of the Company."



(5) EBITDA consists of income (loss) from continuing operations plus interest
    expense, interest cost on postretirement benefit liability, income tax
    expense, and depreciation and amortization expense, less interest income.



     EBITDA is not a measurement presented in accordance with generally accepted
     accounting principles. You should not consider it in isolation from or as a
     substitute for net income or cash flow measures prepared in accordance with
     generally accepted accounting principles or as a measure of our
     profitability or liquidity. EBITDA is included as a supplemental disclosure
     because it may provide useful information regarding our ability to service
     debt and to fund capital expenditures.



(6) Includes current portion of long-term debt and revolving lines of credit.


                                       20
<PAGE>   25

               UNAUDITED CONDENSED PRO FORMA FINANCIAL STATEMENTS


     The tables on the following pages present selected unaudited condensed pro
forma financial data for the periods and dates indicated.



     In 1998, the Company changed its year end to December 31. For pro forma
purposes, the quarter ended March 31, 1998 is combined with the nine months
ended December 31, 1998 to present the twelve months ended December 31, 1998.



     The unaudited condensed pro forma statement of operations and other
financial data give effect to this offering and to the acquisitions of Cynara,
and the pending acquisition of Porta-Test and ESI as though each occurred on
January 1, 1998. The unaudited condensed pro forma balance sheet data gives
effect to this offering and to the acquisitions of Porta-Test and ESI as though
each occurred on June 30, 1999, and excludes contingent consideration related to
Cynara. The unaudited condensed pro forma statements of operations and other
financial data presented below are not necessarily indicative of the financial
results that would have occurred had this offering and the acquisitions of
Cynara, Porta-Test and ESI occurred on January 1, 1998 or of our financial
position had this offering or the acquisitions of Porta-Test and ESI occurred on
June 30, 1999 and should not be viewed as indicative of operations or financial
position in future periods. With respect to our pending acquisitions, we have
only entered into nonbinding letters of intent. Accordingly, the completion of
each of the acquisitions of Porta-Test and ESI is subject to numerous
conditions, including the negotiation and execution of definitive agreements and
the fulfillment or waiver of the conditions to closing to be included in the
agreements. As a result, we can not assure you that these acquisitions will be
completed.



     Porta-Test reports its financial results on the basis of a fiscal year
ending on June 30. The information contained in these unaudited condensed pro
forma financial statements with respect to Porta-Test has been derived from the
unaudited interim financial statements of Porta-Test for the twelve months ended
December 31, 1998 and the six months ended June 30, 1999.



     ESI reports its financial results on the basis of a fiscal year ending on
December 31. The information contained in these unaudited condensed pro forma
financial statements with respect to ESI has been derived from the audited
combined financial statements of ESI for the year ended December 31, 1998 and
the unaudited combined interim financial statements of ESI for the six months
ended June 30, 1999.



     You should read this information in conjunction with "Capitalization,"
"Management's Discussion and Analysis of Financial Condition and Results of
Operations," and our Consolidated Financial Statements and related notes
included elsewhere in this prospectus.


                                       21
<PAGE>   26

                                NATCO GROUP INC.


             UNAUDITED CONDENSED PRO FORMA STATEMENT OF OPERATIONS


                 FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998

                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                       NATCO GROUP INC.
                                     ---------------------
                                       THREE       NINE
                                      MONTHS      MONTHS
                                       ENDED       ENDED                 PRO FORMA     PRO FORMA
                                     MARCH 31,   DECEMBER                 COMBINED    ADJUSTMENTS   PORTA-TEST        ESI
                                       1998      31, 1998    CYNARA(A)   COMPANY(B)    OFFERING     ACQUISITION   ACQUISITION
                                     ---------   ---------   ---------   ----------   -----------   -----------   -----------
<S>                                  <C>         <C>         <C>         <C>          <C>           <C>           <C>
Revenues...........................   $55,219    $145,611     $12,821     $213,651      $    --       $8,118        $3,906
Cost of goods sold.................    44,572     115,521       8,723      168,816           --        4,854         1,882
                                      -------    --------     -------     --------      -------       ------        ------
Gross profit.......................    10,647      30,090       4,098       44,835           --        3,264         2,024
Selling, general and administrative
  expense..........................     7,368      24,530       3,178       35,076           --        2,391         1,231
Depreciation and amortization
  expense..........................       410       1,473       2,500        4,383           --           55            65
Interest expense...................       704       2,215         636        3,555       (3,555)(d)       64            --
Interest cost on postretirement
  liability........................       262         786          --        1,048           --           --            --
Revaluation loss on postretirement
  liability........................        --          53          --           53           --                         --
Interest income....................        --        (227)         --         (227)          --           --           (69)
                                      -------    --------     -------     --------      -------       ------        ------
Income (loss) from continuing
  operations before income taxes...     1,903       1,260      (2,216)         947        3,555          754           797
Provision for income taxes.........        (2)        608        (636)         (30)       1,351(e)        22             6
                                      -------    --------     -------     --------      -------       ------        ------
Income (loss) from continuing
  operations.......................   $ 1,905    $    652     $(1,580)    $    977      $ 2,204       $  732        $  791
                                      =======    ========     =======     ========      =======       ======        ======
Basic earnings per share from
  continuing operations............              $   0.08                 $   0.11
Diluted earnings per share from
  continuing operations............              $   0.07                 $   0.10
Basic weighted average number of
  shares of common stock...........                 8,243                    8,665
Diluted weighted average number of
  shares of common stock...........                 8,942                    9,366
EBITDA.............................              $  5,507                 $  9,706

<CAPTION>

                                      PRO FORMA
                                     ADJUSTMENTS
                                     ACQUISITIONS   PRO FORMA
                                     ------------   ---------
<S>                                  <C>            <C>
Revenues...........................     $  --       $225,675
Cost of goods sold.................        --        175,552
                                        -----       --------
Gross profit.......................        --         50,123
Selling, general and administrative
  expense..........................        --         38,698
Depreciation and amortization
  expense..........................       392(c)       4,895
Interest expense...................       (64)(d)         --
Interest cost on postretirement
  liability........................        --          1,048
Revaluation loss on postretirement
  liability........................        --             53
Interest income....................        --           (296)
                                        -----       --------
Income (loss) from continuing
  operations before income taxes...     $(328)         5,725
Provision for income taxes.........       614(e)       1,963
                                        -----       --------
Income (loss) from continuing
  operations.......................     $(942)      $  3,762
                                        =====       ========
Basic earnings per share from
  continuing operations............                 $   0.28
Diluted earnings per share from
  continuing operations............                 $   0.26
Basic weighted average number of
  shares of common stock...........                   13,665
Diluted weighted average number of
  shares of common stock...........                   14,366
EBITDA.............................                 $ 11,372
</TABLE>



  See the accompanying notes to our unaudited pro forma financial statements.


                                       22
<PAGE>   27

                                NATCO GROUP INC.


             UNAUDITED CONDENSED PRO FORMA STATEMENT OF OPERATIONS


                     FOR THE SIX MONTHS ENDED JUNE 30, 1999


                     (IN THOUSANDS, EXCEPT PER SHARE DATA)



<TABLE>
<CAPTION>
                                                      PRO FORMA
                                                     ADJUSTMENTS   PORTA-TEST        ESI        PRO FORMA
                                        HISTORICAL    OFFERING     ACQUISITION   ACQUISITION   ADJUSTMENTS    PRO FORMA
                                        ----------   -----------   -----------   -----------   -----------   -----------
<S>                                     <C>          <C>           <C>           <C>           <C>           <C>
Revenues..............................   $86,175       $    --       $ 2,253       $1,380         $  --       $ 89,808
Cost of goods sold....................    65,821            --         2,130          840            --         68,791
                                         -------       -------       -------       ------         -----       --------
Gross profit..........................    20,354            --           123          540            --         21,017
Selling, general and administrative
  expense.............................    15,321            --         1,451          632            --         17,404
Depreciation and amortization
  expense.............................     2,311            --            38           27           196(c)       2,572
Interest expense......................     1,673        (1,673)(d)        11           --           (11)(d)         --
Interest cost on postretirement
  liability...........................       523            --            --           --            --            523
Revaluation loss on postretirement
  liability...........................        --            --            --           --            --             --
Interest income.......................       (99)           --            --         (107)           --           (206)
                                         -------       -------       -------       ------         -----       --------
Income (loss) from continuing
  operations before income taxes......       625         1,673        (1,377)          43          (185)           724
Provision for income taxes............       479           636(e)        (26)          --          (503)(e)        586
                                         -------       -------       -------       ------         -----       --------
Income (loss) from continuing
  operations..........................   $   146       $ 1,037       $(1,351)      $  (12)        $ 318       $    138
                                         =======       =======       =======       ======         =====       ========
Basic earnings per share from
  continuing operations...............   $  0.02                                                              $   0.01
Diluted earnings per share from
  continuing operations...............   $  0.01                                                              $   0.01
Basic weighted average number of
  shares of common stock..............     9,151                                                                14,151
Diluted weighted average number of
  shares of common stock..............     9,824                                                                14,824
EBITDA................................   $ 5,033                                                              $  3,613
</TABLE>



  See the accompanying notes to our unaudited pro forma financial statements.

                                       23
<PAGE>   28


                                NATCO GROUP INC.



                  UNAUDITED CONDENSED PRO FORMA BALANCE SHEET


                              AS OF JUNE 30, 1999

                       (IN THOUSANDS, EXCEPT SHARE DATA)


<TABLE>
<CAPTION>
                                                 PRO FORMA                                      PRO FORMA
                                                 OFFERING        PRO FORMA   PORTA-            ADJUSTMENTS        PRO FORMA
                                   HISTORICAL   ADJUSTMENTS      OFFERING     TEST     ESI     ACQUISITIONS      AS ADJUSTED
                                   ----------   -----------      ---------   ------   ------   ------------      -----------
<S>                                <C>          <C>              <C>         <C>      <C>      <C>               <C>
             ASSETS
Current assets:
  Cash and cash equivalents......   $  1,428     $ 55,000(a)     $ 16,882    $   80   $  149     $ (6,011)(c)     $  1,100
                                                  (39,065)(b)                                     (10,000)(d)
  Marketable Securities..........         --         (481)(e)          --        --    2,600           --            2,600
  Trade accounts receivable, net
    of allowance for doubtful
    accounts.....................     35,208           --          35,208       613      655           --           36,476
  Inventories....................     19,731           --          19,731       639      331           --           20,701
  Note receivable from an officer
    and a director...............      1,803          481(e)        2,284        --       --           --            2,284
  Net deferred income tax
    assets.......................      1,894           --           1,894        --       --           --            1,894
  Income tax receivable..........      1,671          624(e)        2,295        --       --           --            2,295
  Prepaid expenses and other
    current assets...............      1,138           --           1,138       245       25           --            1,407
                                    --------     --------        --------    ------   ------     --------         --------
        Total current assets.....     62,873       16,559          79,432     1,577    3,760      (16,011)          68,758
                                    --------     --------        --------    ------   ------     --------         --------
  Property, plant and equipment,
    net..........................     18,120           --          18,120       338      220        1,375(c)        20,053
  Goodwill.......................     16,648           --          16,648        --       --        5,444(c)        27,013
                                                                                                    4,921(d)
  Net deferred income tax
    assets.......................      6,797           --           6,797        --       --           --            6,797
  Other assets, net..............      1,030           --           1,030        --        9           --            1,039
                                    --------     --------        --------    ------   ------     --------         --------
        Total assets.............   $105,468     $ 16,559        $122,027    $1,915   $3,989     $ (4,271)        $123,660
                                    ========     ========        ========    ======   ======     ========         ========
  LIABILITIES AND STOCKHOLDERS'
              EQUITY
Current Liabilities:
  Current installments of
    long-term
    debt.........................   $  4,693     $ (4,693)(b)    $     --    $   93   $   --     $    (93)(c)     $     --
  Revolving credit bank loan.....      1,929       (1,929)(b)          --        --       --           --               --
  Accounts payable...............     14,533           --          14,533       358       22           --           14,913
  Accrued expenses and other.....     10,825           --          10,825       962      153           --           11,940
  Customer advances..............        721           --             721        --       43           --              764
  Income taxes payable...........         --           --              --        --       --           --               --
                                    --------     --------        --------    ------   ------     --------         --------
        Total current
          liabilities............     32,701       (6,622)         26,079     1,413      218          (93)          27,617
                                    --------     --------        --------    ------   ------     --------         --------
  Long-term debt, excluding
    current installments.........     32,443      (32,443)(b)          --       163       --         (163)(c)           --
  Postretirement benefit
    liability and other..........     15,986           --          15,986        28       --           --           16,014
                                    --------     --------        --------    ------   ------     --------         --------
        Total liabilities........     81,130      (39,065)         42,065     1,604      218         (256)          43,631
                                    --------     --------        --------    ------   ------     --------         --------
Stockholders' equity:
  Common stock, $.01 par value
    per share....................         91           50(a)          141        --        2           (2)(c)(d)       141
  Additional paid-in capital.....     38,651       56,591(a)(e)    95,242        --        4           63(d)        95,309
  Accumulated deficit............     (8,672)      (1,017)(e)      (9,689)      323    4,547       (4,870)(c)(d)    (9,689)
  Treasury stock, 470,188 shares
    at
    cost.........................     (4,550)                      (4,550)       --     (990)         990(d)        (4,550)
  Accumulated other comprehensive
    loss.........................     (1,182)          --          (1,182)      (12)     208         (196)          (1,182)
                                    --------     --------        --------    ------   ------     --------         --------
        Total stockholders'
          equity.................     24,338       55,624          79,962       311    3,771       (4,015)          80,029
                                    --------     --------        --------    ------   ------     --------         --------
        Total liabilities and
          stockholders' equity...   $105,468     $ 16,559        $122,027    $1,915   $3,989     $ (4,271)        $123,660
                                    ========     ========        ========    ======   ======     ========         ========
</TABLE>



  See the accompanying notes to our unaudited pro forma financial statements.

                                       24
<PAGE>   29

                                NATCO GROUP INC.


          NOTES TO UNAUDITED CONDENSED PRO FORMA FINANCIAL STATEMENTS



     The following sets forth the assumptions used in preparing our unaudited
condensed pro forma statements of operations for the twelve months ended
December 31, 1998 and for the six months ended June 30, 1999 and our unaudited
condensed pro forma balance sheet as of June 30, 1999.



 STATEMENTS OF OPERATIONS



     (a) The results for Cynara are taken from their interim financial
statements for the period from January 1, 1998 to November 18, 1998, the date
that we acquired Cynara. Results for Cynara include a provision for additional
goodwill amortization of $0.5 million.



     (b) Results for this column represent our results combined with those of
Cynara for the twelve months ended December 31, 1998.



     (c) To reflect additional goodwill amortization recorded in the acquisition
of Porta-Test of $0.3 million and $0.1 million and ESI of $0.1 million and $0.1
million for the twelve months ended December 31, 1998 and the six months ended
June 30, 1999.



     (d) To reflect the elimination of our interest expense of $3.6 million and
$1.7 million, and the interest expense of Porta-Test of $0.1 million and $0.0
million, for the twelve months ended December 31, 1998 and the six months ended
June 30, 1999, as a result of repayments of all outstanding debt balances with
the proceeds of this offering.



     (e) To reflect income tax adjustments at a rate of 38% for the interest
expense adjustments and income tax expense and benefit to Porta-Test and ESI at
a rate of 38%.


 BALANCE SHEET


     (a) To reflect our sale of 5,000,000 shares of our common stock in this
offering at an assumed initial public offering price of $12.00 per share and the
related costs and the application of the net proceeds of the sale. The unaudited
condensed pro forma statements of operations reflect reductions of interest
attributable to the use of those proceeds to pay our debt under our revolving
credit facility.



     (b) To reflect the repayment of $39.1 million of outstanding borrowings
under our credit facilities from the proceeds of this offering.



     (c) To reflect the pending acquisition of Porta-Test for $6.1 million,
consisting of $5.1 million cash, a note of $0.7 million and assumed debt of $.3
million. We will retire the assumed debt of $0.3 million and reflect payment of
the $0.7 million note we recorded in connection with the acquisition from the
proceeds of this offering. We will account for the acquisitions by using the
purchase method of accounting; the preliminary valuation of fair market values
of assets and liabilities of Porta-Test did not differ materially from those
amounts recorded as historical cost. Excess purchase price over the fair market
value of the underlying assets of $5.4 million was allocated to goodwill and
will be amortized over 20 years.



     (d) To reflect the pending acquisition of ESI for $10.1 million, consisting
of $10.0 million cash and options to purchase 25,000 shares of common stock at
the initial public offering price valued at $0.1 million. As part of the
purchase, the former owner of ESI will contribute property, plant and equipment
valued at $1.4 million. We will account for the acquisition by using the
purchase method of accounting; the preliminary valuation of fair market values
of assets and liabilities of ESI did not differ materially from those amounts
recorded as historical cost. Excess purchase price over the fair market value of
the underlying assets of $4.9 million was allocated to goodwill and will be
amortized over 40 years.



     (e) To record the net effect of a bonus to be paid to the Chief Executive
Officer upon the completion of the initial public offering. We will issue
136,832 shares of stock to the officer at a price of $8.81 per share in exchange
for a $1.2 million note receivable. Upon completion of the offering, we will pay
the officer a bonus equal to the outstanding principal and interest of the note,
and we will record

                                       25
<PAGE>   30


compensation expense in the amount of $1.2 million. We will also record
compensation expense of $0.4 million to reflect the difference between the
anticipated price per share of the initial public offering, and the price to be
paid by the officer of $8.81. At the time the bonus is paid, the officer will
repay $0.7 million toward the balance due on his note. We will also record a tax
benefit of $0.6 million related to this transaction. This expense will be
recognized, net of income taxes, in the quarter the offering is consummated. See
"Management -- Employment Agreement."




                                       26
<PAGE>   31

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS


HISTORY OF OUR COMPANY



     Our company was incorporated in 1988 by Capricorn I. In 1989, Capricorn I
and a group of investors provided us with sufficient funds to enable us to
acquire all the outstanding capital stock of National Tank Company, W. S. Tyler,
Incorporated (Tyler) and another company from Combustion Engineering, Inc. (C-E)
for cash. National Tank Company is now our principal subsidiary.



     In December 1991, Capricorn I loaned us approximately $5.0 million. In
exchange, we issued to Capricorn I our subordinated promissory notes in an equal
principal amount.



     In 1992, we organized PTH as our subsidiary and contributed to it all the
outstanding stock of W. S. Tyler, Incorporated.



     During the period from June 1989 through January 1997, both we and
Capricorn I, on various occasions, acquired shares of our common stock from our
original investor group other than Capricorn I. By the end of January 1997,
Capricorn I was our sole stockholder.



     Between 1992 and 1997, Capricorn I consented to the addition to principal
of accrued but unpaid interest on our subordinated promissory notes, and to
various extensions of the maturities of the promissory notes.



     On June 30, 1997, we undertook a significant financing and reorganization.
At that time:



     - PTH, with the consent of Capricorn I, assumed $4.6 million in principal
       amount of our subordinated promissory notes;



     - we distributed all the outstanding capital stock of PTH to Capricorn I;



     - we refinanced our portion of the original subordinated promissory notes
       by issuing a new $5.1 million 13% subordinated promissory note due 2000
       in exchange for the old notes;



     - Capricorn II acquired from us a new $2.4 million 13% subordinated
       promissory note due 2000 and 2,113,334 shares of our common stock for
       $13.0 million in cash; and



     - we acquired all the outstanding capital stock of Total Engineering
       Services Team, Inc. (TEST) by using the proceeds from the Capricorn II
       financing and proceeds from borrowings under a bank credit facility.



     In March 1998, we issued 1,010,333 shares of our common stock to Capricorn
I and 468,925 shares of our common stock to Capricorn II in exchange for the
surrender and cancellation of our subordinated promissory notes.



     In November 1998, we acquired Cynara by merging it into our subsidiary
National Tank Company in exchange for which we:



     - paid $5.3 million in cash;



     - repaid $10.1 million of Cynara's debt;



     - issued 500,000 shares of our Class B common stock; and



     - granted Cynara's stockholders a right to receive up to 1,400,000
       additional shares (which we currently expect not to exceed 1,250,000
       shares) of our Class B common stock under specified circumstances.



     We have consolidated the results of operations of Cynara with our results
from the date of acquisition under the purchase method of accounting for
business combinations.


                                       27
<PAGE>   32


     To assist us in our acquisition of Cynara, Capricorn II invested $5.3
million in our company in exchange for a convertible promissory note. In
December 1998, Capricorn II elected to convert the note, and we issued an
additional 504,762 shares of our common stock to Capricorn II.


OVERVIEW


     We are a holding company, and substantially all of our operations are
conducted through our directly and indirectly wholly owned subsidiaries. We
operate through four business segments:



     - traditional production equipment and services, which primarily provides
       standardized components, replacement parts and used components and
       equipment servicing;



     - engineered systems, which primarily provides customized, large scale
       integrated oil and gas production systems;



     - our Canadian operations, which combine traditional production equipment
       and services and engineered systems; and



     - instrumentation and electrical control systems, which provides control
       panels and systems that monitor and control oil and gas production.



     We recognize revenues from significant contracts (contracts greater than
$250,000 and longer than four months in duration) and all instrumentation and
electrical contracts and orders on the percentage of completion method. We
record revenues and profits on other sales as shipments are made. Earned revenue
is based on the percentage that incurred costs to date bear to total estimated
costs. If estimated total costs on any contract or work-in-process indicate a
loss, we recognize the entire loss immediately. We generally recognize revenue
and earnings to which the percentage of completion method applies over a period
of two to six quarters. Customers typically retain an interest in uncompleted
projects.



RESULTS OF OPERATIONS


<TABLE>
<CAPTION>
                                                FOR THE FISCAL YEARS ENDED            FOR THE TWELVE MONTHS ENDED
                                                         MARCH 31,                           DECEMBER 31,
                                            -----------------------------------   -----------------------------------
                                              1997               1998             1997(1)            1998(1)
                                            --------           --------           --------           --------
<S>                                         <C>        <C>     <C>        <C>     <C>        <C>     <C>        <C>
Statement of Operations Data:
 Revenues.................................  $126,657   100.0%  $202,023   100.0%  $182,372   100.0%  $200,830   100.0%
 Cost of goods sold.......................   100,803    79.6    161,801    80.1    146,804    80.5    160,093    79.7
                                            --------   -----   --------   -----   --------   -----   --------   -----
 Gross profit.............................    25,854    20.4     40,222    19.9     35,568    19.5     40,737    20.3
 Selling, general and administrative
   expense................................    23,313    18.4     28,553    14.1     28,219    15.5     31,898    15.9
 Depreciation and amortization expense....       862     0.7      1,322     0.7      1,086     0.6      1,883     0.9
 Interest expense.........................     1,861     1.5      2,992     1.5      3,112     1.7      2,919     1.5
 Interest cost on postretirement
   liability..............................       957     0.8      1,048     0.5      1,067     0.6      1,048     0.5
 Revaluation (gain) loss on postretirement
   liability..............................     1,466     1.2        159     0.1        159     0.1         53      --
 Interest income..........................      (116)   (0.1)      (140)   (0.1)       (98)   (0.1)      (227)   (0.1)
                                            --------           --------           --------           --------
 Income (loss) from continuing operations
   before income taxes....................    (2,489)   (2.0)     6,288     3.1      2,023     1.1      3,163     1.6
 Provision (benefit) for income taxes.....      (659)   (0.5)     1,141     0.6        938     0.5        606     0.3
                                            --------           --------           --------           --------
 Income (loss) from continuing
   operations.............................    (1,830)   (1.5)     5,147     2.5      1,085     0.6      2,557     1.3
 Income from discontinued operations, net
   of income tax(2).......................     1,100     0.9        767     0.4        767     0.4         --      --
 Gain on disposal of division, net of
   income tax.............................     4,788     3.8         --      --         --      --         --      --
                                            --------           --------           --------           --------
 Net income...............................  $  4,058     3.2   $  5,914     2.9   $  1,852     1.0   $  2,557     1.3
                                            ========           ========           ========           ========

<CAPTION>
                                                 FOR THE SIX MONTHS ENDED
                                                         JUNE 30,
                                            ----------------------------------
                                              1998              1999
                                            --------           -------
<S>                                         <C>        <C>     <C>       <C>
Statement of Operations Data:
 Revenues.................................  $106,658   100.0%  $86,175   100.0%
 Cost of goods sold.......................    85,635    80.3    65,821    76.4
                                            --------   -----   -------   -----
 Gross profit.............................    21,023    19.7    20,354    23.6
 Selling, general and administrative
   expense................................    15,274    14.3    15,321    17.8
 Depreciation and amortization expense....       795     0.7     2,311     2.7
 Interest expense.........................     1,347     1.3     1,673     1.9
 Interest cost on postretirement
   liability..............................       524     0.5       523     0.6
 Revaluation (gain) loss on postretirement
   liability..............................        --      --        --      --
 Interest income..........................      (101)   (0.1)      (99)   (0.1)
                                            --------           -------
 Income (loss) from continuing operations
   before income taxes....................     3,184     3.0       625     0.7
 Provision (benefit) for income taxes.....       594     0.6       479     0.6
                                            --------           -------
 Income (loss) from continuing
   operations.............................     2,590     2.4       146     0.1
 Income from discontinued operations, net
   of income tax(2).......................        --      --        --      --
 Gain on disposal of division, net of
   income tax.............................        --      --        --      --
                                            --------           -------
 Net income...............................  $  2,590     2.4   $   146     0.1
                                            ========           =======
</TABLE>


- ---------------


(1) In 1998, we changed our fiscal year end from March 31 to December 31. For
    comparison purposes, we have presented our unaudited statement of operations
    data for the twelve months ended December 31, 1997 and 1998.



(2) Represents the results of operations of PTH, all the outstanding stock of
    which was distributed by us to Capricorn I as a dividend on June 30, 1997.
    See Note (17) to Notes to Consolidated Financial Statements.


                                       28
<PAGE>   33


 SIX MONTHS ENDED JUNE 30, 1999 COMPARED TO SIX MONTHS ENDED JUNE 30, 1998



     Revenues. Revenues for the first six months of 1999 decreased $20.5
million, or 19%, to $86.2 million from $106.7 million for the six months ended
June 30, 1998. Revenues generated in the first six months of 1999 included $5.1
million of revenue attributed to Cynara, which we acquired in November 1998.
Excluding the impact of Cynara for 1999, our revenues would have declined $25.6
million, or 24%, in the first six months of 1999 compared to the first six
months of 1998. The overall decline in revenue in 1999 compared to 1998 was
attributable to the significant reduction in spending by our customers as a
result of the sharp decrease in energy prices that began in mid-1998 and
continued until early 1999.



     Revenues for traditional equipment and services for the six months ended
June 30, 1999 decreased $11.6 million, or 30%, to $26.8 million from $38.5
million for the first six months of 1998. For comparison purposes, the average
number of drilling rigs operating in the United States during the first six
months of 1999 was 538, compared to an average of 916 rigs operating during the
first six months of 1998. This 41% decrease in the average number of rigs
operating is indicative of the significant curtailment in spending levels of our
customers.



     Revenues for engineered systems for the six months ended June 30, 1999
increased $7.3 million, or 34%, to $28.7 million from $21.4 for the first six
months of 1998. This increase was largely due to the inclusion of Cynara's
results in 1999. The remaining increase was due to the completion of contracts
awarded to us in the second half of 1998 and completed in the first six months
of 1999.



     Revenues for NATCO-Canada for the six months ended June 30, 1999 decreased
by $16.7 million, or 63%, to $9.6 million from $26.3 million for the six months
ended June 30, 1998. The decrease in revenue was attributable to the significant
decline in spending levels by our customers due to low energy prices as well as
the completion of a large project in 1998.



     Revenues for instrumentation and electrical systems for the six months
ended June 30, 1999 increased $0.6 million, or 3%, to $22.8 million from $22.2
million for the six months ended June 30, 1998.



     Gross Profit. Gross profit for the six months ended June 30, 1999 decreased
$0.7 million, or 3.2%, to $20.4 million, compared to $21.0 million for the six
months ended June 30, 1998. As a percentage of revenue, gross margins improved
to 23.6% for the six months ended June 30, 1999 versus 19.7% for the six months
ended June 30, 1998. The margin improvement was attributable partially to the
inclusion of Cynara's results in 1999, as well as an improved product mix due to
the sharp decline in revenue from NATCO-Canada, which historically has generated
lower margins.



     Gross profit for traditional equipment and services decreased $3.1 million,
or 31.3%, for the six months ended June 30, 1999, to $6.8 million, compared to
$9.9 million the first six months of 1998. This decrease was primarily due to
the 30% reduction in revenue during the same time period. As a percentage of
revenue, gross margins were 25.3% for the first six months of 1999, compared to
25.7% for the first six months of 1998.



     Gross profit for the six months ended June 30, 1999 for engineered systems
increased $3.6 million, or 102.8%, to $7.1 million, compared to $3.5 million for
the six months ended June 30, 1998. The increase was partially due to the
inclusion of Cynara in the 1999 results, as well as the completion of two
projects during the second quarter of 1999 that had favorable margins. As a
percentage of revenue, gross margins were 24.7% for the first six months of
1999, compared to 16.1% for the first six months of 1998.



     Gross profit for the six months ended June 30, 1999 for NATCO-Canada
decreased $1.8 million, or 57%, to $1.4 million, compared to $3.2 million for
the six months ended June 30, 1998. Gross profit decreased due to a 63% decline
in revenue during the same period. As a percentage of revenue, gross margins
were 14.7% for the first six months of 1999, compared to 12.3% for the first six
months of 1998.



     Gross profit for the first six months of 1999 for instrumentation and
electrical systems increased $0.6 million, or 13.3%, to $5.1 million, compared
to $4.5 million for the first six months of 1998. Gross profit improved due
primarily to the more efficient completion of projects in 1999 and to the
completion of


                                       29
<PAGE>   34


a high margin project in Venezuela during the second quarter of 1999. As a
percentage of revenue, gross margins were 22.1% for the first six months of
1999, compared to 20.1% for the first six months of 1998.



     Selling, General and Administrative Expense. Selling, general and
administrative expense totaled $15.3 million for the six months ended June 30,
1999, unchanged from the $15.3 million reported for the six months ended June
30, 1998. Overall, reductions in expenses in the United States and Canada as a
result of the severe downturn in the industry were offset by the inclusion of
Cynara in the 1999 results. In addition, during the first six months of 1999 we
recorded non-recurring costs primarily associated with the retirement of one of
our officers totaling $0.5 million. During the first six months of 1999, we
revised previous estimates related to the remaining costs associated with the
closure of NATCO (UK) Ltd., and reversed these accruals.



     Depreciation and Amortization Expense. Depreciation and amortization
expense for the first six months of 1999 increased $1.5 million, or 191%, to
$2.3 million, compared to $0.8 million the first six months of 1998. This
increase was due solely to the inclusion of Cynara in 1999.



     Interest Expense. Interest expense was $1.7 million in the first six months
of 1999, compared to $1.3 million for the same period in 1998. This 24% increase
in interest expense was due primarily to increased debt incurred in connection
with the acquisition of Cynara.



     Interest Cost on Postretirement Benefit Liability. Interest cost on
postretirement benefit liability remained constant on a year-to-year basis.



     Income from Continuing Operations. Income from continuing operations for
the six months ended June 30, 1999 decreased to $0.1 million compared to $2.6
million for the six months ended June 30, 1998. The decrease is due primarily to
the $0.7 million decrease in gross margin (largely due to the decrease in
revenues), a $1.5 million increase in depreciation and a $0.4 million increase
in interest expense.



     Net Income. Net income for the six months ended June 30, 1999 decreased to
$0.1 million compared to $2.6 million reported for the six months ended June 30,
1998. The decrease was due to the various factors discussed above.



 TWELVE MONTHS ENDED DECEMBER 31, 1998 COMPARED TO TWELVE MONTHS ENDED DECEMBER
 31, 1997



     Revenues. Revenues for the year ended December 31, 1998 increased $18.5
million, or 10%, to $200.8 million from $182.4 million for the year ended
December 31, 1997. The increase was principally attributable to the inclusion of
TEST for the full year in 1998 as compared to six months for 1997. The increase
was also attributable to the inclusion of Cynara revenue for five weeks in 1998.
Excluding the impact of the acquisitions, our revenues would have declined $7.0
million, or 4%, from 1998 to 1997. The decline in revenue in 1998 compared to
1997 was attributable to the reduction in spending by our customers as a result
of the sharp decrease in energy prices that began in mid-1998 and continued
until early 1999.



     Revenues for traditional production equipment and services for the year
ended December 31, 1998 decreased $1.6 million, or 2%, to $71.0 million from
$72.6 million for the year ended December 31, 1997.



     Revenues for engineered systems for the year ended December 31, 1998
increased $8.9 million, or 24%, to $45.6 million from $36.6 million for the year
ended December 31, 1997. This increase is largely due to the completion of
projects in 1998 that were awarded to us in 1997.



     Revenues for NATCO-Canada for the year ended December 31, 1998 decreased by
$11.2 million, or 20%, to $43.5 million from $54.7 million for the year ended
December 31, 1997. The decrease in revenue was attributable to the significant
decline in spending levels by our customers due to low energy prices as well as
the completion of a large project in the first six months of 1998.



     Revenues for instrumentation and electrical systems for the year ended
December 31, 1998 increased $24.7 million, or 113%, to $46.6 million from $21.9
million from the year ended December 31, 1997. The


                                       30
<PAGE>   35


increase is principally attributable to the inclusion of TEST for the full year
in 1998 as compared to six months in 1997.



     Gross profit. Gross profit for the year ended December 31, 1998 increased
$5.2 million, or 15%, to $40.7 million from $35.6 million from the year ended
December 31, 1997. As a percentage of revenue, gross margin improved to 20.3%
for 1998 versus 19.5% for 1997. The margin improvement was attributable to
improved performance for engineered systems projects as well as an improved
product mix due to the sharp decline in revenue from NATCO-Canada, which
historically has generated lower margins.



     Gross profit for traditional production equipment and services decreased
$1.1 million, or 6%, to $17.6 million from $18.7 million from the year ended
December 31, 1997. This decrease was primarily due to the 2.2% reduction in
revenue during the same time period. As a percentage of revenue, gross margins
were 24.8% for 1998 compared with 25.7% for 1997.



     Gross profit for engineered systems increased $3.9 million, or 87%, to $8.4
million from $4.5 million from the year ended December 31, 1997. The increase
was partially due to the inclusion of Cynara in the 1998 results, as well as due
to the completion of projects during 1998, which had more favorable margins due
to improved project management as well as selectivity in the bid and acceptance
process. As a percentage of revenue, gross margins were 18.3% for 1998 compared
to 12.2% for 1997.



     Gross profit for NATCO-Canada decreased $2.4 million, or 29%, to $6.0
million from $8.4 million. The decrease is principally attributable to a 20%
reduction in revenues for the same period of time. As a percentage of revenue,
gross margins were 13.7% for 1998 compared to 15.3% in 1997.



     Gross profit for instrumentation and electrical systems increased $4.8
million, or 122%, to $8.9 million from $4.0 million from the year ended December
31, 1997. The increase was principally attributable to the inclusion of TEST for
the full year in 1998 as compared to six months in 1997. As a percentage of
revenue, gross margins were 19.0% for 1998 compared with 18.5% for 1997.



     Selling, General and Administrative Expense. Selling, general and
administrative expense increased $3.7 million, or 13%, to $31.9 million for the
year ended December 31, 1998 compared to $28.2 million for the year ended
December 31, 1997. The increase was primarily due to the inclusion of TEST for
the full year in 1998 compared to only six months in 1997, as well as the
inclusion of Cynara for five weeks in 1998. In addition, non-recurring expenses
totaling $1.6 million were recorded in 1998, of which $1.2 million related to
our previous initial public offering effort in early 1998, and $0.4 million
related to severance costs incurred. In addition, insurance reserve reductions
totaling $2.5 million were recorded in 1998, reflecting revisions to previous
estimates related to workers compensation and general liability claims. In 1997,
we incurred non-recurring compensation expense related to the conversion of
stock appreciation rights into stock options totaling $1.2 million.



     Depreciation and Amortization Expense. Depreciation and amortization
expense increased $0.8 million, or 73%, to $1.9 million from $1.1 million for
the year ended December 31, 1997. This increase was principally to goodwill
amortization related to the TEST acquisition and depreciation related to Cynara
gas processing plants.



     Interest Expense. Interest expense decreased $0.2 million, or 6%, to $2.9
million from $3.1 million for the year ended December 31, 1997. This 6% decrease
in interest expense was due primarily to the conversion of 13% subordinated
notes into common stock by our principal stockholders on April 1, 1998.



     Interest Cost on Postretirement Benefit Liability. Interest cost on
postretirement benefit liability remained constant on a year-to-year basis.



     Revaluation Loss on Postretirement Benefit Liability. Revaluation loss
decreased by $0.1 million, or 67%, from $0.2 million for the year ended December
31, 1997 to $0.1 million for the year ended December 31, 1998. This resulted
from slight changes in the actuarial assumptions.



     Income from Continuing Operations. Income from continuing operations for
1998 increased $1.5 million, or 136%, to $2.6 million from $1.1 million for the
year ended December 31, 1997. The


                                       31
<PAGE>   36


increase was due primarily to the $5.2 million increase in gross profit (largely
due to the decrease in revenues), less a $0.8 million increase in depreciation
and a $3.7 million increase in selling, general and administrative expense.



     Net Income. Net income for the year ended December 31, 1998 decreased $0.7
million, or 38%, to $2.6 million from $1.9 million for the year ended December
31, 1997. The decrease was due to the various factors discussed above.


 FISCAL YEAR ENDED MARCH 31, 1998 COMPARED TO FISCAL YEAR ENDED MARCH 31, 1997


     Revenues. Revenues for the fiscal year ended March 31, 1998 increased by
$75.3 million, or 59%, to $202.0 million from $126.7 million for the fiscal year
ended March 31, 1997. Of this increase, $32.7 million was attributable to the
inclusion of the results of TEST in our results for the last nine months of the
fiscal year ended March 31, 1998. We had revenues of $27.7 million from the BP
Exploration (Alaska), Inc. alliance project compared to revenues of only $4.5
million from such alliance for the fiscal year ended March 31, 1997.



     Revenues for traditional production equipment and services for fiscal 1998
increased by $19.9 million, or 35%, to $76.8 million from $56.9 million for
fiscal 1997. The increase in revenues resulted primarily from strong demand in
the market for these products and services.



     Revenue for engineered systems for fiscal 1998 decreased by $9.3 million,
or 21%, to $34.3 million from $43.6 million for fiscal 1997. The decrease in
revenues resulted primarily from the postponement of a major project and from
our increased selectivity in the bid process.



     Revenues for NATCO-Canada, for fiscal 1998, increased by $27.7 million, or
87%, to $59.7 million compared to $32.0 million for fiscal 1997. A significant
portion of the increase in revenues was due to a substantial project for BP
Exploration (Alaska), Inc.



     Revenues for instrumentation and electrical systems of $33.2 million was
attributable to the inclusion of TEST revenues for the nine months ended March
31, 1998.



     Gross Profit. Gross profit for fiscal 1998, increased $14.3 million, or
56%, to $40.2 million from $25.9 million for fiscal 1997 primarily due to the
increases in revenues discussed above. As a percentage of revenues, gross
profits remained unchanged for fiscal 1998 compared to fiscal 1997.



     Gross profit for traditional production equipment and services for fiscal
1998 increased $5.1 million, or 35%, to $19.6 million from $14.5 million for
fiscal 1997 primarily due to the increases in revenue discussed above. As a
percentage of revenues, gross profit decreased from 25.5% for fiscal 1997 to
25.6% for fiscal 1998, primarily as a result of a shift in the mix of business,
as the volume of higher margin parts business grew less rapidly than the
traditional equipment business.



     Gross profit for engineered systems for fiscal 1998 decreased $0.8 million,
or 14%, to $5.2 million from $6.0 million for fiscal 1997, primarily due to the
decrease in revenue discussed above. As a percentage of revenues, gross profit
increased from 13.8% for fiscal 1997 to 15.1% for fiscal 1998.



     Gross profit for NATCO-Canada for fiscal 1998 increased by $3.6 million, or
67%, to $9.0 million from $5.4 million for fiscal 1997 primarily due to the
increase in revenue discussed above. As a percentage of revenues, gross profit
decreased from 16.7% for fiscal 1997 to 15.1% for fiscal 1998, primarily as a
result of a lower margin on the BP Exploration (Alaska), Inc. project.



     Gross profit for instrumentation and electrical systems of $6.4 million for
fiscal 1998 was attributable to the inclusion of gross profit for TEST for the
nine months ended March 31, 1998.



     Selling, General and Administrative Expense. Selling, general and
administrative expense increased $5.2 million, or 22%, to $28.5 million for
fiscal 1998 from $23.3 million for fiscal 1997. Of this increase, $4.7 million
was attributable to the inclusion of the results of TEST, and the remainder was
primarily attributable to increased expenses associated with the increase in
volume in our business. In addition, insurance reserve reductions totaling $1.3
million were recorded during the year ended March 31, 1998,

                                       32
<PAGE>   37


reflecting a revisions to previous estimates related to workers compensation and
general liability claims. For the year ended March 31, 1997, non-recurring
compensation expense related to the conversion of stock appreciation rights into
stock options totaling $1.2 million was recorded.



     Depreciation and Amortization Expense. Depreciation and amortization
expense increased $0.5 million, or 53%, to $1.3 million for fiscal 1998 from
$0.9 million for fiscal 1997. Of the $0.5 million increase in fiscal 1998, $0.4
million related to depreciation and amortization expense at TEST.



     Interest Expense. Interest expense increased by $1.1 million, or 58%, to
$3.0 million for fiscal 1998 from $1.9 million for fiscal 1997, primarily as a
result of increased debt incurred in connection with the acquisition of TEST.



     Interest Cost on Postretirement Benefit Liability. Interest cost on
postretirement benefit liability increased $0.1 million, or 10%, to $1.0 million
for fiscal 1998 from $1.0 million for fiscal 1997 due to increased amortization
resulting from an upward revaluation of the postretirement benefit liability
based on revised actuarial assumptions at March 31, 1997.



     Revaluation Loss on Postretirement Benefit Liability. Our revaluation of
postretirement benefit liability decreased $1.3 million, or 87%, from $1.5
million for fiscal 1997 to $0.2 million for fiscal 1998. This resulted primarily
from a decrease in the discount rate used in the actuarial calculations.



     Income (Loss) from Continuing Operations. Income from continuing operations
increased $7.0 million to $5.1 million for fiscal 1998 from a loss of $1.8
million for fiscal 1997, primarily as a result of increases in gross profit and
the inclusion of operations of TEST for the nine months ended March 31, 1998.



     Income from Discontinued Operations. Income from discontinued operations of
$0.8 million for the year ended March 31, 1998 and $1.1 million for the year
ended March 31, 1997 represented income from our subsidiary PTH, the capital
stock of which was distributed in June 1997 to our sole stockholder.



     Net Income. Net income increased by $1.9 million, or 46%, to $5.9 million
for fiscal 1998 from $4.1 million for fiscal 1997 primarily as a result of the
factors discussed above.


LIQUIDITY AND CAPITAL RESOURCES


     We primarily use cash for our working capital, capital expenditures and
acquisitions. Our cash sources are cash provided by operations, cash provided by
investing activities and cash provided by financing activities. To the extent
our cash requirements for working capital, capital expenditures and acquisitions
exceed the cash provided by operations and investing activities, we must finance
our cash requirements, primarily through debt and equity financing activities.
As of June 30, 1999, we had cash and working capital of $1.4 million and $30.2
million. As of June 30, 1999, after giving effect to this offering, we would
have had cash and working capital of $16.9 million and $53.4 million.



     Net cash provided by (used in) operating activities for the fiscal years
ended March 31, 1997 and 1998 was $1.1 million and $3.1 million, and for the
nine months ended December 31, 1998 was $(1.5) million. For the six months ended
June 30, 1999, net cash provided by operating activities was $3.2 million.



     Net cash used in investing activities for the years ended March 31, 1997
and 1998 was $0.8 million and $24.7 million. Net cash used in investing
activities for the nine months ended December 31, 1998 was $17.1 million. Our
primary use of funds in fiscal 1998 was the acquisition of TEST, which required
the use of $22.4 million of cash. Our primary use of funds for the nine months
ended December 31, 1998 was the acquisition of Cynara, which required the use of
$15.5 million of cash.



     We maintain a revolving credit and term loan facility as well as a working
capital facility for export sales. The revolving credit facility provides for up
to $22.0 million of borrowings in the United States and up to $10.0 million of
borrowings in Canada, subject to borrowing base limitations. As of August 31,
1999,


                                       33
<PAGE>   38


borrowings under the revolving credit facility totaled $8.7 million. In
addition, we had issued $3.6 million of letters of credit under the revolving
facility as of August 31, 1999. The initial term loan of $32.5 million had been
reduced to $30.8 million as of August 31, 1999. Borrowings under the revolving
credit facility mature in November 2001, and the term loan matures in November
2003. The revolving credit and term facility is secured by substantially all of
our assets. The export sales credit facility provides for aggregate borrowings
of $10.0 million, subject to borrowing base limitations, of which $0.9 million
was outstanding as of August 31, 1999. In addition, we had issued letters of
credit totaling $8.3 million under the export facility. The export sales credit
facility is secured by specific project inventory and receivables, and is
partially guaranteed by the EXIM Bank. The export sales credit facility loans
mature in July 2002. As of August 31, 1999, the weighted average interest rate
of our borrowings under our credit facilities was 7.9%.



     We will repay all outstanding borrowings under the revolving credit and
term loan facility as well as the export sales credit facility, which as of
August 31, 1999 totaled $39.8 million, with the net proceeds of this offering.
We will use the balance of the net proceeds from this offering for general
corporate purposes, including the funding of the acquisitions of Porta-Test and
ESI. Total cash consideration for these acquisitions will be approximately $12.7
million, net of cash acquired.



     We estimate that cash generated from operations for the remainder of 1999
and all of fiscal 2000 will be sufficient to meet our cash operating
requirements during that time. Our capital expenditures generally consist of
renovations and expansions of our manufacturing plants, technological
improvements to our management information systems and acquisitions of, and
improvements to, other equipment we use in our business. Historically, these
capital expenditures have ranged from $1.0 million to $2.0 million annually.
Upon completion of this offering, we will have $28.4 million of credit available
under our revolving credit facility and $1.7 million available under our export
sales credit facility, both subject to borrowing base limitations, which will be
available to fund our working capital, capital expenditures and other corporate
uses. As of August 31, 1998, borrowing base limitations reduced our available
borrowing capacity to $20.4 million. We believe that our operating cash flow,
supported by our borrowing capacity, will be adequate to fund our operations
throughout the remainder of 1999 and all of 2000. If we should decide to pursue
one or more acquisition opportunities during fiscal 2000, our determination as
to our ability to finance the acquisitions will be a critical element of our
analysis of the opportunities.



INFLATION AND CHANGES IN PRICES



     The costs of materials (e.g., steel) for our products rise and fall with
their value in the commodity markets. Generally, increases in raw materials and
labor costs are passed on to our customers.


RECENT ACCOUNTING PRONOUNCEMENTS


     Statement of Financial Accounting Standards No. 133, Accounting for
Derivative Instruments and Hedging Activities, was issued by the Financial
Accounting Standards Board in June 1998. SFAS 133 standardizes the accounting
for derivative instruments, including derivative instruments embedded in other
contracts. Under the standard, entities are required to carry all derivative
instruments in the statement of financial position at fair value. The accounting
for changes in the fair value (i.e., gains or losses) of a derivative instrument
depends on whether it has been designated and qualifies as part of a hedging
relationship and, if so, on the reason for holding it. If specified conditions
are met, entities may elect to designate a derivative instrument as a hedge of
exposures to changes in fair values, cash flows, or foreign currencies. If the
hedged exposure is a fair value exposure, the gain or loss on the derivative
instrument is recognized in earnings in the period of change together with the
offsetting loss or gain on the hedged item attributable to the risk being
hedged. If the hedged exposure is a cash flow exposure, the effective portion of
the gain or loss on the derivative instrument is reported initially as a
component of other comprehensive income (outside earnings) and subsequently
reclassified into earnings when the forecasted transaction affects earnings. Any
amounts excluded from the assessment of hedge effectiveness, as well as the


                                       34
<PAGE>   39


ineffective portion of the gain or loss, is reported in earnings immediately.
Accounting for foreign currency hedges is similar to the accounting for fair
value and cash flow hedges. If the derivative instrument is not designated as a
hedge, the gain or loss is recognized in earnings in the period of change.



     We will adopt SFAS 133 for our fiscal year beginning January 1, 2001. We
have not determined the impact that SFAS 133 will have on our financial
statements and believe that the determination will not be meaningful until
closer to the date of initial adoption.



QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK



     We are exposed to market risks. Market risk is the potential loss arising
from adverse changes in market prices and rates. We do not enter into derivative
or other financial instruments for trading or speculative purposes. Our market
risk could arise from changes in interest rates and foreign currency exchange
rates.



     Interest Rate Risk. We are subject to market risk exposure related to
changes in interest rates. Assuming our current level of borrowings, a 100 basis
point increase in interest rates under these borrowings would decrease our 1998
pro forma net income by approximately $0.4 million and our 1998 pro forma cash
flow from operations by approximately $0.4 million. In the event of an adverse
change in interest rates, we could take action to mitigate our exposure. Due to
the uncertainty of the actions that would be taken and their possible effects,
however, this analysis assumes no such actions. Furthermore, this analysis does
not consider the effects of the change in the level of overall economic activity
that could exist in such an environment.



     Foreign Currency Exchange Risk. Our earnings and financial position are
affected by foreign exchange rate fluctuations. The majority of our foreign
currency transactions are denominated in the Canadian dollar, which is the
functional currency of NATCO-Canada. As these contracts are denominated and
settled in the functional currency, risks associated with currency fluctuations
are minimized. We do not currently hedge against foreign currency translation
risks and we believe that foreign currency exchange risk is not significant to
our operations.



     A portion of our sales are made in Southeast Asia, where several countries
have experienced significant devaluations in their currencies against the United
States dollar in 1997 and early 1998. The devaluation of these currencies and
the related consequences to the economies in those countries have adversely
affected economic growth in the region. To the extent that the economics of
countries in this region continue to be adversely affected, demand for our
products and services in the region most likely will be reduced.



YEAR 2000 COMPLIANCE



     Issues involving the Year 2000, or "Y2K," concern the business implications
associated with the upcoming change in century. On January 1, 2000, all computer
hardware and software systems that use outdated 2-digit year fields may
experience processing errors that could result in system failures. For example,
programs that have date-sensitive features may recognize 01/01/00 as January 1,
1900 instead of January 1, 2000. These failures may be limited or they may be
widespread depending on the system and its software, as well as its location and
function.



     State of Readiness. The nature of our business and our products is not
dependent upon hardware and software to the extent that Y2K issues pose a
significant threat. In early 1998, we nonetheless formed a Y2K task force to
prepare for January 1, 2000. This task force was charged with reviewing,
assessing, and ensuring compliance of hardware and software in the following
areas:



     - current products;



     - manufacturing systems;



     - enterprise management systems;



     - personal computers and personal computer networks;


                                       35
<PAGE>   40


     - engineering and design systems;



     - infrastructure; and



     - suppliers.



Based upon its analysis and evaluations and written communications from vendors
and licensors of company-used hardware and software, we do not believe that the
risks of system malfunctions resulting from the interrelationships of our
systems with those of customers, suppliers or contractors are significant.



     The Y2K task force is also communicating with our suppliers and customers
regarding their state of Y2K readiness. Specifically, the task force has either
received or is in the process of receiving written documentation from these
third parties regarding their Y2K readiness and the issues they believe it
raises for them. The task force has more closely scrutinized those suppliers
that provide us with products that are more likely to present Y2K issues and
believes that no significant Y2K issues exist. The task force has also reviewed
publicly available information, if any, regarding these third-party systems and
their Y2K compliance.



     While we expect to complete our Y2K review by October 31, 1999, we plan to
continue reviewing the issue throughout the balance of 1999.



     Cost to Address Y2K Issues. Costs directly related to assessing Y2K issues
through September 30, 1999 are less than $50,000 and have been expensed. We do
not expect to incur significant additional cost related to Y2K compliance during
the remainder of 1999. These estimated costs are based on our best estimates.



     Y2K Risk Factors. While we believe that our internal operations do not have
material issues with respect to Y2K compliance, we cannot guarantee that
assessment. Additionally, we may not properly identify all potential problems or
all potentially affected systems. In that case, we will not have remedied all
these problems within our systems. We also have no means of insuring that third
parties with whom we conduct our business will be Y2K ready. The inability of
these third parties to complete their Y2K assessments in a timely fashion could
materially impact our results of operations and cash flows. The effect of
non-compliance by these third parties is not determinable.



     The most likely "worst case" impacts that we could reasonably anticipate
from Y2K non-compliance are as follows:



     - our inability to execute financial transactions with our banks or other
       third parties whose systems fail or malfunction;



     - impairment of the ability of third-party suppliers or service companies
       to provide needed materials or services to our planned and ongoing
       operations necessitating deferral or total shut down of our operation;
       and



     - impairment of our ability to deliver our products to, or receive payment
       from, our customers.



     Contingency Plans. We have a contingency plan in place to ensure the safety
of our employees. While this plan covers all company employees, it is
specifically directed at those employees working in offshore environments and on
international assignments.



     Summary. We believe that we will be able to achieve substantial Y2K
readiness with respect to the critical systems that we control. The extent and
magnitude of the Y2K problem as it will effect us, both before and for some time
after January 1, 2000, are, however, difficult to predict or quantify. We cannot
assure you that all of our systems and all outside systems that we depend upon
will be adequately identified and compliant so that they are Y2K ready by
January 1, 2000 so as not to create a material disruption to our business. If,
despite our reasonable efforts and our task force's reasonable efforts, there
are mission critical Y2K related failures that create substantial disruption to
our business, the adverse effects could be material. These unknown material
effects and the costs associated with them are difficult to estimate accurately
because of unanticipated vendor delays, technical difficulties, the impacts of
test of outside systems and similar events.

                                       36
<PAGE>   41

                                    BUSINESS

GENERAL


     We are a leading provider of wellhead equipment, systems and services used
in the production of oil and gas. Our production equipment and systems are
primarily used at or near the wellhead to separate oil and gas within a
hydrocarbon stream and to remove contaminants. Separation and decontamination at
the wellhead are necessary to meet the specifications of transporters and end
users. Our products and services are used in onshore and offshore fields in most
major oil and gas producing regions in the world. On a pro forma basis after
giving effect to our acquisition of Cynara, our revenues and EBITDA for the
twelve months ended December 31, 1998 were approximately $213.7 million and $9.7
million. Our revenues and EBITDA for the six months ended June 30, 1999 were
approximately $86.2 million and $5.0 million.



     We design and manufacture a diverse line of production equipment,
including:



     - separators, which separate a hydrocarbon stream into oil, gas and water;



     - dehydration and desalting units, which remove water and salt from oil and
       gas;



     - heaters, which prevent solids from forming in gas and reduce the
       viscosity of oil;



     - gas conditioning units and membrane separation systems, which remove
       carbon dioxide and other contaminants from a gas stream;



     - water filtration systems, which remove oil and contaminants from water
       derived from the production process; and



     - control systems, which monitor and control production equipment.



     We offer our products and services as either integrated systems or
individual components. We provide our products and services through four
business segments:



     - traditional production equipment and services;



     - engineered systems;



     - our Canadian operations, which combine traditional production equipment
       and services and engineered systems; and



     - instrumentation and electrical systems.



     We have designed, manufactured and marketed production equipment and
systems for over 70 years. We believe that, among our competitors, we have the
largest installed base of production equipment in the industry. We have achieved
our position in the industry by maintaining our technological leadership,
capitalizing on our strong brand name recognition and offering a broad range of
products and services.


THE INDUSTRY


     Demand for oil and gas production equipment and services is driven
primarily by:



     - levels of production of oil and gas in response to worldwide demand;



     - the discovery of new oil and gas fields;



     - the changing production profiles of existing fields (meaning the mix of
       oil, gas and water in the hydrocarbon stream and the level of
       contaminants); and



     - the quality of new hydrocarbon production.



     Generally, oil and gas exploration and production companies reduce
exploration and development activity during periods of weak oil prices and
demand and increase this activity during periods of strong oil


                                       37
<PAGE>   42


prices and demand. The extent to which the revenues of our industry increase
depends upon the success of the exploration efforts. In general, these revenue
increases lag expansion of exploration and development capital budgets in times
of recovery in the oil and gas industry. These lag times can be up to several
years in offshore operations but are generally shorter for onshore operations.



     Changing production profiles in existing fields also increase the demand
for products and services in our industry. As existing fields are reworked or
enhanced recovery methods are employed, additional and more complex equipment
may be required to produce oil and gas from these fields. This can result from:



     - changes in the mix of oil and gas produced by the field; or



     - an increase in water, carbon dioxide or other naturally occurring
       contaminants or as the result of enhanced recovery techniques.



In addition, many new oil and gas fields contain lower quality hydrocarbon
streams that require more complex production equipment. Examples include carbon
dioxide rich formations in West Texas and Southeast Asia and heavy crude in
Western Canada and in the Orinoco Delta in Venezuela.


STRATEGY


     Our strategy for future growth is to expand and improve our market position
through:



     - Focusing on Customer Relationships. We believe that our customers
       increasingly prefer to work on a regular basis with a small number of
       leading suppliers. The objectives of our customers in establishing
       preferred relationships (both formal and informal) with suppliers that
       can provide a broad range of products and services on a cost effective
       and timely basis are to reduce production costs and delivery times. We
       believe this trend will continue, or even accelerate, as major oil
       companies and large independent producers downsize staffs and outsource
       services. We believe our size, scope of products, technological expertise
       and service orientation provide us with a competitive advantage in
       establishing preferred supplier relationships with customers. We expect
       to generate growth in revenue and market share by establishing and
       further developing new and existing customer relationships.



     - Providing Turnkey Integrated Systems and Solutions. We believe our
       turnkey design and manufacturing capabilities enable us to reduce our
       customers' production equipment and systems costs and shorten delivery
       times. Our strategy is to be involved in projects early, to provide, as
       among our competitors, the broadest and most complete scope of equipment
       and services and to focus on larger integrated systems. In some
       applications, we also intend to increase the degree of standardization to
       reduce engineering costs and to shorten delivery times.



     - Introducing New Technologies and Products. Since our inception, we have
       developed and acquired leading technologies that enable us to address the
       world market demand for increasingly sophisticated production equipment.
       We hold numerous U.S. and foreign patents and operate a modern research
       and development laboratory in Tulsa, Oklahoma. We will continue to pursue
       new technologies through licenses, acquisitions and internal development.



     - Pursuing Complementary Acquisitions. Our industry is highly fragmented
       and contains many smaller competitors with narrow product lines and
       geographic scope. We intend to continue acquiring companies that provide
       complementary technologies or enhance our ability to offer integrated
       systems. An example is our acquisition last year of Cynara which provided
       us with proprietary bulk carbon dioxide separation technology.



     - Expanding International Presence. We have operated in various
       international markets for more than 50 years. We intend to continue
       expanding internationally in targeted geographic regions. These are
       regions in which we either have a relationship with a customer or have
       technology that provides us with a competitive advantage. Currently, our
       most important international opportunity is the future development of
       Southeast Asian gas markets. We believe our proprietary technology for


                                       38
<PAGE>   43


the bulk removal of carbon dioxide provides us with a competitive advantage in
pursuing projects in this region.



RECENT ACQUISITION



     The Cynara Company. In November 1998, we acquired Cynara because it had
proprietary technology for the bulk removal of carbon dioxide from gas streams.
Cynara designs, constructs, operates and services membrane separation systems
utilizing this technology. A primary market for this application is production
from gas wells, such as those located in Southeast Asia, which have high levels
of naturally occurring carbon dioxide. Another market is production from wells,
such as those located in West Texas, in which carbon dioxide injection is used
to enhance the recovery of oil and gas reserves. This acquisition has expanded
our ability to offer integrated systems and services and complements our gas
conditioning product line.





     In acquiring Cynara, we issued 500,000 shares of our common stock and paid
$5.3 million in cash to the Cynara stockholders. We also repaid $10.1 million of
Cynara's debt and agreed to issue additional shares of our common stock
contingent on the occurrence of specified operational thresholds. Based on
operations through September 30, 1999, approximately 300,000 of these additional
shares have been earned and will be issued on November 30, 1999. Up to a total
of 950,000 more of these additional shares may be earned at March 31, 2000 and
December 31, 2000.



PENDING ACQUISITIONS



     We have executed non-binding letters of intent to acquire Porta-Test
International Inc. and Engineering Specialties, Inc. These acquisitions, if
completed, will close subsequent to the completion of this offering.



     Porta-Test International Inc. Porta-Test is located in Edmonton, Alberta,
Canada. Porta-Test designs and manufactures centrifugal devices used to enhance
the effectiveness of separation equipment. We expect to close the acquisition of
Porta-Test in late 1999.



     For the year ended June 30, 1999, Porta-Test had revenues of $7.3 million
and EBITDA of $(0.1) million. To acquire all the outstanding Porta-Test capital
stock, we have agreed:



     - to pay approximately $5.4 million in cash, net of cash acquired; and



     - to issue our one-year promissory note for approximately $0.7 million.



     Engineering Specialities, Inc. ESI is located in Covington, Louisiana. ESI
designs and manufactures water processing equipment used to remove oil and
contaminants from water produced at the wellhead, primarily on offshore
facilities. We expect to close the acquisition of ESI in early 2000.



     For the year ended December 31, 1998, ESI had revenues of $3.9 million and
EBITDA of $0.8 million. To acquire all the outstanding ESI capital stock, we
have agreed:



     - to pay approximately $7.3 million in cash, net of cash and marketable
       securities acquired; and



     - to issue options for 25,000 shares of our common stock, exercisable at
       the initial offering price.


                                       39
<PAGE>   44

PRODUCTS AND SERVICES


     We operate our business in four business segments, each of which is
described below.


 TRADITIONAL PRODUCTION EQUIPMENT AND SERVICES


     Our traditional production equipment and services consist of:



     - production equipment;



     - replacement parts; and



     - used equipment refurbishing and servicing.



     We had revenues of $71.0 million and EBITDA of $4.5 million for the year
ended December 31, 1998 from traditional production equipment and services. For
the six months ended June 30, 1999, we had revenues and EBITDA of $26.9 million
and $0.9 million respectively from this business segment. We sell our
traditional production equipment and services primarily onshore in North America
and in the Gulf of Mexico. We typically provide traditional production equipment
built for the North American oil and gas industry "off the shelf" or in
customized variations of standardized equipment which requires limited
engineering.



     We market our traditional production equipment and services through 31
sales and service centers in the United States, two in Canada and one in
Venezuela. We have relationships with a number of customers for traditional
production equipment and related services. See "-- Customer Relationships."


     Traditional production equipment includes:


     Separators. Separators are used for the primary separation of a hydrocarbon
stream into oil, water and gas. Our separator product line includes:



     - horizontal separators, which are used to separate hydrocarbon streams
       with large volumes of gas, liquids or foam;



     - vertical separators, which are used to separate hydrocarbon streams
       containing contaminants including salt and wax;



     - filter separators, which are used to remove particulate contaminants from
       gas streams; and



     - Thermo Pak(TM) Units, which are used for the combined heating and
       separating of production in cold climates.



     Oil Dehydration Equipment. Oil dehydrators are used to remove water from
oil. Our oil dehydration product line includes:



     - horizontal PERFORMAX(R) treaters, which separate oil and water mixtures
       using gravity and proprietary technology;



     - Dual Polarity(R) electrostatic treaters, which dehydrate oil using high
       voltage electrical pulsation;



     - vertical treaters, which optimize recovery of condensable, salable
       hydrocarbons;



     - Vertical Flow Horizontal (VFH(TM)) processors, which combine the
       advantages of horizontal and vertical vessels to remove gas and water
       from oil streams; and



     - heater-treaters, which use heat to accelerate the dehydration process.



     Heaters. Heaters are used to reduce the viscosity of oil to improve flow
rates and to prevent hydrates from forming in the gas stream. We manufacture
both indirect fired heaters and standardized and


                                       40
<PAGE>   45


customized direct fired heaters. In each system, heat is transferred to the
hydrocarbon stream through a medium such as water, water/glycol, steam, salt or
flue gas. Our heater product line includes:



     - water bath heaters;



     - vaporizers used to vaporize propane and other liquefied gases;



     - salt bath heaters;



     - steam bath heaters; and



     - Controlled Heat Flux Heaters (CHF(TM)), which use combustion to create a
       heat transfer medium.



     Gas Conditioning Equipment. Gas conditioning equipment removes contaminants
from gas streams. Our gas conditioning equipment includes:



     - glycol dehydration equipment, which expose gas streams to glycol in order
       to remove water vapor;



     - amine systems, which use amine to remove acidic gases such as hydrogen
       sulfide and carbon dioxide from gas streams;



     - conditioning equipment used to remove hydrogen sulfide from gas;



     - Glymine(R) units, which combine the effects of glycol equipment and amine
       systems;



     - the BTEX-Buster(R), which virtually eliminates the emissions of volatile
       hydrocarbons associated with glycol dehydration reboilers; and



     - Desi-Dri(R) Systems, which use highly compressed drying agents to remove
       water vapor from gas streams.



     Gas Processing Equipment. We offer standard and custom processing equipment
for the extraction of liquid hydrocarbons to meet feed gas and liquid product
requirements. We manufacture several standard mechanical refrigeration units for
the recovery of salable hydrocarbon liquids from gas streams. Our Low
Temperature Extractor (LTX(R)) units are mechanical separation systems designed
for handling high pressure gas at the wellhead. These systems remove liquid
hydrocarbons from gas streams more efficiently and economically than other
methods.



     Water Treatment Equipment. We design and manufacture water treatment and
conditioning equipment for the removal of contaminants from water extracted in
oil and gas production. Oil producers use our PERFORMAX(R) Matrix Plate
Coalescer in primary separators of oil and water and final skimming. Our flow
splitter removes gases from an oil-water dispersion, separates oil and water and
discharges the oil and/or emulsion through controllable outlets.



     Equipment Refurbishment. We source, refurbish and integrate used oil and
gas production equipment. Our customers that purchase this equipment enjoy
reduced delivery times and lower equipment costs relative to new equipment. The
used equipment market is focused primarily in North America, both onshore and
offshore, although we have observed a growing interest internationally. We have
entered into agreements with major and large independent oil companies in both
the United States and Canada to evaluate, track and refurbish used production
equipment. We may act as a broker between another oil company and our customer
or we may purchase, refurbish and sell used equipment to our customers. We
believe that we have one of the largest databases in the North American oil and
gas industry of available surplus production equipment. This data base, coupled
with our extensive refurbishing facilities and experience, enables us to respond
to customer requests for refurbished equipment quickly and efficiently.



     Parts, Service and Training. We provide replacement parts for our own
equipment and for equipment manufactured by others. Each branch of our marketing
network also serves as a local parts and service business. We have service
employees stationed in some branches of Wilson Supply Company and
National-Oilwell, Inc. We also offer operational and safety training to the oil
and gas production industry. We use our training programs as a marketing tool
for our other products and services.

                                       41
<PAGE>   46

 ENGINEERED SYSTEMS


     We design, engineer and manufacture these systems for large production
development projects throughout the world. We also provide start-up services for
our engineered products. Our engineered systems typically require a significant
amount of technology, engineering and project management. On a pro forma basis,
giving effect to our acquisition of Cynara, we had revenues of $58.4 million and
EBITDA of $2.4 million for the year ended December 31, 1998 from engineered
systems. For the six months ended June 30, 1999, we had revenues and EBITDA of
$28.7 million and $3.8 million from this business segment.



     We market our engineered systems through direct sales forces based in
Houston, Calgary, London, Tokyo, Kuala Lumpur and Caracas, augmented by
independent representatives in other countries. We also use the unique oil
testing capabilities at our research and development facility to market
engineered systems. This capability enables us to determine equipment
specifications that best suit customers' requirements. See "-- Technology and
New Products."



     Our engineered systems include:



     Integrated Oil and Gas Processing Trains. These consist of multiple units
that process oil and gas from primary separation through contaminant removal. In
this aspect of our business, we provide both the engineering and the fabrication
functions. For example, we designed, manufactured and assembled a module for a
production facility situated off the coast of West Africa that is capable of
processing 20,000 barrels of oil, 4,000 barrels of water and 24 million standard
cubic feet of gas per day. Also, we designed, manufactured and installed process
systems for BP Exploration (Alaska), Inc.'s 35,000 barrel per day Badami
development on the North Slope of Alaska and its 65,000 barrel per day Northstar
development, also located on the North Slope.



     Floating Production Systems. These consist of large skid-mounted processing
units used in conjunction with semi-submersible, converted tanker and other
floating production vessels. Floating production equipment must be specially
designed to overcome the detrimental effects of wave motion on floating vessels.
We pioneered and patented the first wave-motion production vessel internal
system. We continue to advance this technology at our research and development
facility using a wave-motion table which simulates a variety of sea states.



     Dehydration and Desalting Systems. Dehydration and desalting involves the
removal of water and salt from an oil stream. Desalting is a specialized form of
dehydration. In this process, water is injected into an oil stream to dissolve
the salt and the saltwater is then removed from the stream. Large production
projects often use electrostatic technology to desalt oil. We believe that we
are the leading developer of electrostatic technologies for oil treating and
desalting.



     One of our dehydration and desalting systems, the Electro Dynamic(TM)
Desalter, can be used in oil refineries, where stringent desalting requirements
have grown increasingly important. These requirements have increased as crude
quality has declined and catalysts have become more sensitive and sophisticated,
requiring lower levels of contaminants. The reduced number of vessels employed
by our system is particularly important in refinery applications where space is
at a premium.



     Large Gas Processing Facilities. We provide large gas processing facilities
for the separation, heating, dehydration and removal of liquids and contaminants
to produce pipeline or liquefaction-quality gas. We also design, manufacture
and, in some cases, operate gas processing facilities which remove carbon
dioxide from gas streams. These facilities use Cynara's membrane technology,
which provides the most cost-effective separation solution for gas streams
containing more than 20% carbon dioxide. A primary market for this application
is production from gas wells, such as those located in Southeast Asia, which
have high levels of naturally-occurring carbon dioxide. Another market is
production from wells, such as those located in West Texas, in which carbon
dioxide injection is used to enhance the recovery of oil and gas reserves.


                                       42
<PAGE>   47


     Downstream Facilities. We offer several technologies that have crossover
applications in the refinery and petrochemical sectors. Most involve aspects of
oil treating and water treating. We discussed above the use in refineries of one
of our dehydration and desalting systems. In addition, we provide our DOX(TM)
units to ethylene processors that clean both heavy and light dispersed oil from
water.



 NATCO-CANADA



     We have operations in Calgary and Edmonton, Alberta, Canada, that provide a
combination of traditional production equipment and services and engineered
systems to oil and gas producers in Western Canada. Most production equipment
manufactured by NATCO-Canada is similar in design and purpose to that built in
the U.S., with modifications to operate in a cold weather environment.
Periodically, we use NATCO-Canada engineering and manufacturing to assist in our
engineered systems projects. We had revenues of $43.5 million and EBITDA of $3.2
million for the year ended December 31, 1998 from NATCO-Canada. For the six
months ended June 30, 1999, we had revenues and EBITDA of $9.6 million and $0.3
million from this business segment.


 INSTRUMENTATION AND ELECTRICAL SYSTEMS


     We had revenues of $46.6 million and EBITDA of $4.3 million for the year
ended December 31, 1998 from instrumentation and electrical systems. For the six
months ended June 30, 1999, we had revenues and EBITDA of $22.8 million and $3.0
million from this business segment.



     The primary market for our instrumentation and electrical systems is in
offshore applications throughout the world. We market and service these products
through a four branch network primarily located in the Gulf Coast area.



     Our instrumentation and electrical systems include:



     Control Systems. We design, assemble and install pneumatic, hydraulic,
electrical and computerized control panels and systems. These systems monitor
and change key parameters of oil and gas production systems. Key parameters
include wellhead flow control and emergency shutdown of production and safety
systems. A control system consists of a control panel and related tubing,
wiring, sensors and connections.



     Engineering and Field Services. We provide start-up support, testing,
maintenance, repair, renovation, expansion and upgrade of control systems
including those designed or installed by competitors. Our design and engineering
staff also provide contract electrical engineering services.



     SCADA Systems. Supervisory control and data acquisition (SCADA) systems
provide remote monitoring and control of equipment, production facilities,
pipelines and compressors via radio, cellular phone, microwave and satellite
communication links. Our SCADA systems reduce the number of personnel and
frequency of site visits and allow for continued production during periods of
emergency evacuation, thereby reducing operating costs.



CUSTOMER RELATIONSHIPS



     We devote a considerable portion of our marketing time and effort to
developing and maintaining relationships with key customers. Some of these
relationships are project-specific, such as our participation as an "alliance"
partner with BP Amoco in several Alaskan projects, or with Mobil in the
development of its Chinook platform in the Gulf of Mexico. In other instances,
we are also preferred supplier for products and services to key customers in
particular equipment lines or over large geographic areas. Examples of this
preferred supplier role include our relationships with BP Amoco, UPR, Sonat
Exploration, Chevron Canada, Mobil Oil Canada and Renaissance.


                                       43
<PAGE>   48

TECHNOLOGY AND NEW PRODUCTS


     We are a leader in the development of oil and gas industry production
equipment technology. We pioneered many of the original separation technologies
for converting unprocessed hydrocarbon fluids into salable oil and gas. We have
developed:



     - the first high capacity oil and gas separator;



     - the first emulsion treating system;



     - Dual Polarity(TM) electrostatic oil treaters;



     - DOX(TM) and OSX(TM) water filtration systems;



     - high pressure indirect heaters; and



     - PERFORMAX(R) oil and water treating systems.



     Our wave-motion compensating separator has become the industry standard for
floating production applications, and our electrostatic oil treating technology
is the most advanced in the industry. As of August 31, 1999, we held 52 active
U.S. patents and a number of foreign patents. We have applications pending for
one U.S. patents. In addition, we are licensed under three patents held by
others.



     We operate our own research and development facility in Tulsa, Oklahoma,
where we use a number of test devices to simulate and analyze oil and gas
production processes. We also use specialized computer software to simulate gas
and fluid flow dynamics in equipment systems.



     Through Cynara, we are a recognized leader in the application of membrane
technology to the bulk removal of carbon dioxide from gas streams. We have an
active research and development effort ongoing in the area of membrane
technology.


MANUFACTURING


     Our major manufacturing facilities are located in:



     - New Iberia, Louisiana. We fabricate packaged production systems for
       delivery throughout the world at this 52,000 square foot and 17 acre
       waterfront facility, which can handle large equipment systems. We
       upgraded and expanded this facility in 1999.



     - Electra, Texas. We produce various types of low and high pressure
       production vessels as well as skid packages at this 130,000 square foot
       facility.



     - Pittsburg, California. We fabricate the membranes for our bulk carbon
       dioxide membrane separation equipment at this 8,000 square foot facility.



     - Calgary, Alberta, Canada. We produce heavy wall and cold weather packaged
       equipment and systems primarily for the Canadian and Alaskan markets at
       this 100,500 square foot facility.



     Our manufacturing operations are vertically integrated. This means we are
able to fabricate, heat treat, inspect, assemble and test our products at each
facility. Consequently, we are able to control the quality of our products and
the cost and schedule of our manufacturing activities.



     Our New Iberia, Electra and Calgary facilities have been certified to ISO
9002 standards. ISO 9002 is an internationally recognized verification system
for quality management overseen by the International Standards Organization
based in Geneva, Switzerland. The certification is based on a review of our
programs and procedures designed to maintain and enhance quality production and
is subject to annual review and recertification.



     We fabricate to the standards of the American Petroleum Institute, the
American Welding Society, the American Society of Mechanical Engineers and
specific customer specifications. We use welding and fabrication procedures in
accordance with the latest technology and industry requirements. Training

                                       44
<PAGE>   49


programs have been instituted to upgrade skilled personnel and maintain high
quality standards. We believe that these programs generally enhance the quality
of our products and reduce their repair rate.


COMPETITION


     Contracts for our products and services are generally awarded on a
competitive basis and competition is intense. The most important factors
considered by our customers in awarding contracts include:



     - the availability and capabilities of our equipment;



     - our ability to meet the customer's delivery schedule;



     - our price;



     - our reputation;



     - our experience; and



     - our safety record.



Historically, the existence of overcapacity in our industry has caused increased
price competition in many areas of our business.



     In addition, we may encounter obstacles in our international operations
that impair our ability to compete in individual countries. These obstacles may
include:



     - subsidies granted in favor of local companies;



     - taxes, import duties and fees imposed on us and other foreign operators;



     - lower wage rates in foreign countries; and



     - fluctuations in the exchange value of the United States dollar compared
       with the local currency.



     Any or all these factors could adversely affect our ability to compete and
thus adversely affect our results of operations.



     We believe that we are one of the largest oil and gas surface production
equipment providers in North America and that our size, research and development
capabilities, brand names and marketing organization provide us with a
competitive advantage over other participants in the industry.


BACKLOG


     As of August 31, 1999, we had backlog of $87.9 million, of which $68.8
million was related to CTOC. Backlog consists of firm customer orders for which
we have been authorized to begin work or to purchase materials, satisfactory
credit or financing arrangements exist and delivery is scheduled. Our backlog is
based on the price of awarded fixed price projects and the estimated price of
awarded cost-plus projects, in each case adjusted by management's estimate of
the percentage of the project that has been completed.



     All projects currently included in our backlog are subject to change and/or
termination at the option of the customer. Either change or termination could
substantially change the amount of backlog we are currently reporting. In the
case of a termination, the customer is generally required to pay us for work
performed and materials purchased through the date of termination and, in some
cases, to pay our termination fees. Due to the large amounts of backlog
estimated for each of a small number of projects, amounts included in our
backlog could decrease substantially if one or more of these projects were to be
terminated by our customers.


                                       45
<PAGE>   50

PROPERTIES


     We are headquartered in Houston, Texas and have 40 sales and service,
manufacturing and other facilities in the United States, two in Canada, two in
Venezuela, one in the United Kingdom, one in Malaysia, one in Japan and one in
Kazakhstan. We own 15 of these facilities and lease the other 33.


EMPLOYEES


     As of August 31, 1999, we had approximately 1,158 employees. This includes
approximately 56 employees located at our manufacturing facility at Calgary who
are covered by a collective bargaining agreement. The most recent collective
bargaining agreement in Calgary was renewed in July 1999 and extends through
July 2001. No other employees are covered by collective bargaining agreements.
We believe that our relationships with our employees are satisfactory.


INSURANCE


     Our operations are subject to the risks inherent in manufacturing products
and providing services to the oil and gas production industry. These risks
include personal injury and loss of life, business interruptions, loss of
production and property and equipment damage. Damages arising from an occurrence
at a location where our products are used have in the past and may in the future
result in the assertion of potentially large claims against us.



     We maintain comprehensive insurance covering our assets and operations,
including product liability and workers' compensation insurance, at levels that
we believe to be appropriate. This insurance is subject to deductibles and
significant amounts of self-insurance retention per occurrence. We cannot assure
you our insurance coverage will be adequate in all circumstances or against all
hazards nor can we assure you that we will be able to maintain adequate
insurance coverage in the future at commercially reasonable rates or on
acceptable terms.



ENVIRONMENTAL MATTERS



     Our operations are subject to environmental regulation by federal, state
and local authorities in the United States and in many foreign countries.
Environmental laws and regulations have changed substantially and rapidly over
the last 20 years, placing more restrictions and limitations on activities that
may impact the environment, such as emissions of pollutants, generation and
disposal of wastes and use and handling of hazardous substances. Violation of
these laws and regulations may result in civil and criminal actions. Although
our efforts to comply with these laws and regulations have not materially and
adversely affected our financial condition or results of operations, we cannot
assure you that compliance with these laws or regulations will not do so in the
future.



     We currently own or lease numerous properties that for many years have been
used for the refurbishment of products and equipment that may contain
hydrocarbons or hazardous substances. In addition, the products that we
manufacture may require the use of hazardous substances. We have utilized
operating and waste disposal practices that were standard in the industry at the
time; nevertheless, hazardous substances may have been released on our
properties or those of others or on or under other locations where hazardous
wastes have been taken for disposal. In addition, we have disposed of wastes on
properties operated by third parties whose treatment and disposal of these
wastes was not under our control. These properties and wastes may be subject to
the Comprehensive Environmental Response, Compensation and Liability Act
(CERCLA), the Resource Conservation and Recovery Act and analogous state laws.
Under these laws, we may be required to remove or remediate previously disposed
wastes and property contamination or to perform remedial operations to prevent
future contamination.



     CERCLA imposes liability, without regard to fault or the legality of the
original conduct, with respect to the release of a hazardous substance into the
environment. Persons subject to CERCLA include the owner and operator of the
disposal site or sites where the release occurred and companies that disposed or
arranged for the disposal of the hazardous wastes found at the site. Persons who
are responsible for


                                       46
<PAGE>   51


releases of hazardous substances under CERCLA may be subject to joint and
several liability for the costs of cleaning up the resulting contamination and
for damages to natural resources. It is not uncommon for neighboring landowners
and other third parties to file claims for personal injury and property damage
allegedly caused by the hazardous substances released into the environment.



     Although we believe that we are in substantial compliance with existing
environmental laws and regulations, we cannot assure you that we will not incur
substantial costs in the future. Moreover, it is possible that implementation of
stricter environmental laws, regulations and enforcement policies could result
in additional, presently unquantifiable costs or liabilities to us.



SAFETY MATTERS



     On January 9, 1998, we received a citation and notification of penalty from
the Occupational Safety and Health Administration (OSHA). OSHA levied a fine of
approximately $260,000 against us following injuries sustained by two employees
for safety violations. The fine was subsequently reduced to $83,160.



     We believe our safety program and record meet or exceed industry standards.
We cannot assure you, however, that OSHA fines will not be levied against us
again in the future if additional safety violations occur.


LEGAL PROCEEDINGS


     We are a party to various routine legal proceedings. These primarily
involve commercial claims, products liability claims, asbestos related personal
injury claims and workers' compensation claims. We cannot predict the outcome of
these lawsuits, legal proceedings and claims with certainty. Nevertheless, we
believe that the outcome of all of these proceedings, even if determined
adversely, would not have a material adverse effect on our business or financial
condition.


                                       47
<PAGE>   52

                                   MANAGEMENT

DIRECTORS AND EXECUTIVE OFFICERS


     The following table sets forth the names, ages and titles of our current
directors and executive officers. The board of directors is divided into three
classes. See "-- Classified Board."



<TABLE>
<CAPTION>
                   NAME                     AGE                    POSITION
                   ----                     ---                    --------
<S>                                         <C>   <C>
Nathaniel A. Gregory(1)...................  51    Chairman of the Board and Chief Executive
                                                    Officer
Patrick M. McCarthy(1)....................  53    President and Director
J. Michael Mayer..........................  43    Senior Vice President and Chief Financial
                                                    Officer
C. Frank Smith............................  47    President of NATCO-U.S.
James Crittall............................  54    President of NATCO-Canada
David R. Volz, Jr. .......................  45    President of TEST
Richard D. Peters.........................  39    President of Cynara
Joseph H. Wilson..........................  47    Senior Vice President -- Marketing
Robert A. Curcio..........................  42    Senior Vice President -- Technology and
                                                    Product Development
Keith K. Allan(2).........................  58    Director
Howard I. Bull(3).........................  58    Director
George K. Hickox, Jr.(2)..................  40    Director
E. Hale Staley............................  69    Director
Herbert S. Winokur, Jr.(1)(3).............  55    Director
</TABLE>


- ------------------------------

(1) Member of Executive Committee.


(2) Member of Audit Committee.



(3) Member of Compensation Committee.



     Set forth below is a brief description of the business experience of our
directors and executive officers.



     Nathaniel A. Gregory has served as our Chairman of the Board and Chief
Executive Officer since April 1, 1993. Prior to joining our company, Mr. Gregory
held a number of positions in both the engineering and construction industries
and in investment banking. Mr. Gregory also serves as a director of Mrs. Fields'
Holding Company, Inc.



     Patrick M. McCarthy has served as our President since December 1997 and as
a director since February 1998. Mr. McCarthy served as Executive Vice President,
with marketing and operations responsibilities for our entire company, from
November 1996 to December 1997 and as Senior Vice President -- Marketing from
June 1994 to November 1996. Prior to joining our company in June 1994, Mr.
McCarthy was Vice President -- Worldwide Oil and Gas at ABB Lummus Crest, an
engineering and construction company, from October 1991 to May 1994.



     J. Michael Mayer joined us in September 1999 as Senior Vice President and
Chief Financial Officer. Prior to joining our company, Mr. Mayer served as Chief
Financial Officer of Cardinal Services, Inc., an oil-field service company, from
July 1998 to July 1999. From July 1997 to June 1998, he served as Chief
Financial Officer of Phoenix Energy Services, LLC, a manufacturer of drilling
equipment and a provider of directional drilling services. From April 1994 to
July 1997, Mr. Mayer served as Chief Financial Officer of Haltermann, Ltd., a
custom chemical manufacturer. From December 1984 to April 1994, Mr. Mayer was
employed by Baker Hughes Inc. in several senior financial positions within its
operations.



     C. Frank Smith has served as President of NATCO-U.S. since January 1998.
Mr. Smith served as Senior Vice President -- Sales and Service from September
1993 to December 1997 and as the Northern Region Director of the Sales and
Service Centers from April 1992 to September 1993.


                                       48
<PAGE>   53


     James Crittall has served as President of NATCO-Canada since November 1996
and was Vice President of Technical Operations from December 1992 to October
1996. Mr. Crittall joined National Tank Company in 1971 and has served in
several managerial positions, including Manager of Engineering and Sales and
Manager of Engineering for NATCO-Canada, Ltd.



     David R. Volz, Jr. has served as President of TEST since we acquired TEST.
Mr. Volz joined TEST in 1976 as a Technical Specialist and has held a number of
positions of increasing responsibility prior to serving as President in July
1997.


     Richard D. Peters has served as President of Cynara since November 1997.
Mr. Peters served as Chief Financial Officer of Cynara from June 1996 to October
1997 and as Project Manager and Accounting Coordinator from February 1991 to May
1996.


     Joseph H. Wilson has served as Senior Vice President -- Marketing of our
company since April 1999. Prior to joining our company, Mr. Wilson served as
Strategic Accounts Manager of Baker Hughes Inc., with responsibilities for
strategic business development, from January 1999 to April 1999. From January
1997 to January 1999, he served as Gulf Coast Region Manager of Baker Hughes
INTEQ's fluids, directional drilling and MWD business. From January 1994 to
January 1997, Mr. Wilson was Director of Sales and Systems Marketing for all of
INTEQ. Prior to January 1994, Mr. Wilson held a number of positions in sales,
operations and marketing with Baker Hughes INTEQ, Baker Sand Control and BJ
Services.



     Robert A. Curcio has served as Senior Vice President -- Technology and
Product Development of our company since May 1998. Prior to joining our company,
Mr. Curcio spent 20 years at Exxon Corporation and its affiliates. Mr. Curcio
was Global Markets Manager -- Heavy Duty Diesel Additives of Exxon Chemical
Co.'s PARAMINS division from February 1996 to May 1998. From January 1995 to
February 1996, he served as Global Markets Manager -- Specialty and Niche
Additives of PARAMINS. From July 1992 to January 1995, he served as PARAMINS'
Product Manager -- Large Engine Additives. Prior to July 1992, Mr. Curcio held a
number of other positions in marketing, management and engineering.



     Keith K. Allan has been a director of our company since February 1998. Mr.
Allan was a director of NATCO (U.K.) Ltd. from October 1996 to January 1998.
From February 1993 to August 1996, Mr. Allan was Technical Director in the North
Sea for Shell U.K. Exploration and Production. Prior thereto, Mr. Allan served
in a number of positions for Royal Dutch/Shell Group, which he joined in 1965.



     Howard I. Bull has been a director of our company since February 1998. From
April 1994 to June 1997, Mr. Bull was President, Chief Executive Officer and a
director of Dal-Tile International, Inc., a manufacturer and distributor of
ceramic tile. From May 1992 to February 1993, Mr. Bull was President of the Air
Conditioning Group of York International Corporation, a producer of heating, air
conditioning and refrigeration systems and equipment, and was President of its
Applied Systems Division from November 1990 to May 1992. From February 1979 to
November 1990, Mr. Bull was employed by Baker Hughes, Inc. in several executive
positions. Mr. Bull is a director of Marine Drilling Companies, Inc. and
National-Oilwell, Inc.



     George K. Hickox, Jr. has been a director of our company since November
1998. Since September 1991, Mr. Hickox has served as a general partner of Heller
Hickox Dimeling Schreiber and Park, a partnership specializing in energy
investments. Mr. Hickox has also served as a director of Cynara prior to its
acquisition by our company. Mr. Hickox presently serves as an officer and
director of several privately held companies.



     E. Hale Staley has been a director of our company since February 1998. He
has served as a consultant to our company since August 1995. Mr. Staley joined
our predecessor in 1952 and served as President and Chief Executive Officer from
July 1985 to July 1995.



     Herbert S. Winokur, Jr. has been a director of our company since its
formation in 1989. Mr. Winokur is Chairman and Chief Executive Officer of
Capricorn Holdings, Inc., a private investment company, and Managing General
Partner of Capricorn Investors, L.P. and Capricorn Investors II, L.P., private


                                       49
<PAGE>   54


investment partnerships concentrating on investments in restructure situations,
organized by Mr. Winokur in 1987 and 1994, respectively. Prior to his current
appointment, Mr. Winokur was Senior Executive Vice President and director of
Penn Central Corporation. Mr. Winokur is also a director of Enron Corp., The WMF
Group, Ltd., Mrs. Fields' Holding Company, Inc., CCC Information Services Group,
Inc. and DynCorp.


CLASSIFIED BOARD


     Our board of directors is divided into three classes. The directors serve
staggered three-year terms. The Class I directors were reelected by written
consent of stockholders in lieu of the 1999 annual meeting of stockholders. The
terms of the directors of the other two classes expire at the annual meetings of
stockholders to be held in 2000 (Class II) and 2001 (Class III). At each annual
meeting of stockholders, one class of directors will be elected for a full term
of three years to succeed that class of directors whose terms are expiring. The
current classification of directors is as follows:



     - Class I -- Messrs. McCarthy and Staley;



     - Class II -- Messrs. Allan, Bull and Hickox; and



     - Class III -- Messrs. Gregory and Winokur.



COMMITMENTS TO ELECT DIRECTORS



     We have entered into an agreement with Capricorn I and Capricorn II
regarding the election of Class III directors. We have agreed that, so long as
Capricorn I and Capricorn II together own 20% or more of our outstanding common
stock, we will nominate the individuals designated by Capricorn I and Capricorn
II for election as the Class III directors when that class stands for election.
If the class should be enlarged, we will be obligated to nominate only the two
individuals so designated. If it should be reduced to one, our obligation will
be to nominate one individual so designated as a Class III director and one as a
Class II director. If a vacancy should arise in Class III, we have agreed to
elect an individual designated by Capricorn I and Capricorn II to fill the
vacancy.



     In connection with our acquisition of Cynara, we amended our charter to
provide for both Class A and Class B common stock and to provide specified
rights to holders of Class B common stock. Following this offering, the two
classes will have the same rights, except that holders of the Class B common
stock will continue to have the right, voting separately as a class, to elect,
by majority vote, one person to our board of directors and to hold a class vote
on any amendment to our charter that would authorize additional Class B common
stock or would adversely affect their right to elect a director. The person so
elected may be removed only by the affirmative vote of the holders of a majority
of the Class B common stock. The individual currently elected to that position
on our board is George K. Hickox, Jr. The Class B common stock converts to Class
A common stock constituting a single class of common stock on January 1, 2002.
The class of directors of which Mr. Hickox is a member stands for reelection at
the annual stockholders meeting to be held during 2001. Accordingly, it is
likely that Mr. Hickox will continue to serve on our board until at least 2004
when his class will again stand for election.


COMMITTEES


     Our audit committee consists of Messrs. Allan and Hickox, each of whom is a
non-employee director. The audit committee, which is chaired by Mr. Allan, meets
separately with representatives of our independent auditors and with
representatives of senior management in performing its functions. The audit
committee reviews the general scope of audit coverages, the fees charged by the
independent auditors, matters relating to our internal control systems and other
matters related to accounting and reporting functions.



     Our compensation committee consists of Messrs. Bull and Winokur, each of
whom is a non-employee director. The compensation committee, which is chaired by
Mr. Winokur, administers our stock option plans, and in this capacity makes all
option grants or awards to our employees, including executive officers,

                                       50
<PAGE>   55


under the plans. In addition, the compensation committee is responsible for
making recommendations to the board of directors with respect to the
compensation of our chief executive officer and our other executive officers and
for establishing compensation and employee benefit policies.



     Our executive and nominating committee consists of Messrs. Gregory,
McCarthy and Winokur. The executive committee, which is chaired by Mr. Gregory,
is authorized to exercise the powers of the board during the intervals between
the meetings of the board. The executive committee also reviews the
qualifications of potential candidates for the board, evaluates the performance
of incumbent directors and recommends to the board nominees to be elected at the
annual meeting of stockholders.


EXECUTIVE COMPENSATION


     The following table sets forth information for the twelve months ended
December 31, 1998 with respect to our chief executive officer and each of our
four other most highly compensated executive officers:


                           SUMMARY COMPENSATION TABLE


<TABLE>
<CAPTION>
                                                                      LONG-TERM
                                                                    COMPENSATION
                                                                    -------------
                                                                     SECURITIES
                                            ANNUAL COMPENSATION      UNDERLYING
                                            -------------------         STOCK          ALL OTHER
                                             SALARY     BONUS       OPTIONS(#)(1)   COMPENSATION(3)
                                             -------   --------     -------------   ---------------
<S>                                         <C>        <C>          <C>             <C>
Nathaniel A. Gregory......................  $350,000   $234,990(2)         --           $6,000
  Chairman and Chief Executive Officer
Patrick M. McCarthy.......................   215,000    136,338        16,667            6,000
  President and Director
William B. Wiener III(4)..................   148,407     81,926            --            6,000
  Senior Vice President and Chief
  Financial Officer
C. Frank Smith............................   158,818     73,130            --            6,000
  President of NATCO-U.S.
David R. Volz, Jr. .......................   124,319    122,842            --            4,861
  President of TEST
</TABLE>


- ------------------------------


(1) Excludes options awarded during the fiscal year ended March 31, 1997 as a
    result of conversion of SARs granted in previous periods or, in the case of
    Mr. Gregory, pursuant to prior option grants. See "-- Individual Employee
    Stock Options" and "-- Stock Option Grants." For information concerning the
    aggregate holdings of stock options by the named executive officers, see
    "-- Stock Option Grants."



(2) See "-- Employment Agreement" for the terms of an additional bonus to be
    paid in connection with the completion of the offering.



(3) Includes our contractual and discretionary contributions to the named
    executive officer's 401(k) plan account.



(4) Mr. Wiener resigned from our company effective May 31, 1999.


EMPLOYMENT AGREEMENT


     Mr. Gregory serves as our chairman and chief executive officer under an
employment agreement. This agreement is renewed annually unless terminated by
Mr. Gregory or us. The agreement provides for an annual base salary in the
amount of $350,000, an annual bonus with a target award of 60% of Mr. Gregory's
base salary based on such targeted performance criteria and additional
discretionary bonuses as are determined annually by our board.


                                       51
<PAGE>   56


     In July 1999, we amended Mr. Gregory's employment agreement to delete a
provision requiring us to pay him a bonus of 1.5% of the value of our company at
the time of our initial public offering. In exchange, we agreed:



     - to lend Mr. Gregory $1,205,490 in cash with which he would purchase from
       us 136,832 shares of our common stock;



     - that Mr. Gregory's borrowings would be evidenced by his full recourse
       promissory note for the same amount bearing interest at 6% per year; and



     - that we would pay Mr. Gregory a bonus equal to the principal of and
       interest accrued on the promissory note at the time of our initial public
       offering.



This bonus will be due upon completion of this offering. Payment of the
principal and interest on Mr. Gregory's note is due upon completion of this
offering, except for an amount equal to taxes on the bonus. That amount will
become due upon the lapse of Mr. Gregory's holding period under Rule 144 with
respect to the shares of our common stock he acquired in July 1999.



     For information regarding a stock option that we granted to Mr. Gregory at
the time he joined our company, as well as a subsequent amendment to that stock
option, see "-- Individual Employee Stock Options."



     If we terminate Mr. Gregory's employment for any reason other than just
cause, he is entitled to severance pay in accordance with any severance plan or
policy that we then have in effect. If Mr. Gregory terminates his employment
agreement for any reason, other than for a material breach of the agreement by
us, he will not be entitled to receive any bonus compensation or severance pay,
and we will have no further obligations except to pay base salary previously
earned.


COMPENSATION OF DIRECTORS


     Directors who are our employees do not receive a retainer or fees for
service on the board or any committees. We pay non-employee members of the board
for their service as directors. Directors who are not employees receive a
quarterly fee of $6,500 and a fee of $500 for attendance at each meeting of the
board. In addition, pursuant to the 1998 Director Stock Option Plan, following
completion of this offering, each non-employee director who is reelected as a
director after completing at least one year of service as a director will
receive, on the date of reelection, a stock option to purchase 2,667 shares of
our common stock at the market price on the date of grant. Some non-employee
directors have also been awarded initial stock options, which vest over a period
of two and one-half years, to purchase 6,667 shares of our common stock at a
price of $8.81 per share. Directors are reimbursed for reasonable out-of-pocket
expenses incurred in attending meetings of the board or committees and for other
reasonable expenses.


INDIVIDUAL EMPLOYEE STOCK OPTIONS


     General. Beginning in June 1989, we issued stock appreciation rights to
some of our employees. In June 1997, we terminated that plan and converted all
those stock appreciation rights into individual employee stock options to
purchase common stock on terms consistent with those of the stock appreciation
rights.



     The related stock option agreements provide for vesting of the individual
employee stock options equally over three or four years, except with respect to
those granted to Mr. Gregory. Individual employee stock options become fully
vested in certain circumstances upon a sale of our company and upon the death or
disability of the recipient while employed by us. Individual employee stock
options terminate upon the earliest to occur of:



     - the termination of employment with us for cause;



     - thirty days after termination of employment with us for any reason other
       than cause;


                                       52
<PAGE>   57


     - thirty days after an alteration of employment; or



     - the expiration of the option period provided in each stock option
       agreement.



     We are obligated to purchase vested options under specified circumstances.
Individual employee stock options are not transferable and may be exercised only
by the recipient or his estate. The shares of our common stock subject to the
stock option agreements and the related exercise prices are subject to
adjustment in specified events.



     As of September 30, 1999, individual employee stock options, including
those granted to Mr. Gregory and discussed below, have been granted with respect
to a total of 1,782,613 shares of our common stock. Of these:



     - 720,558 are exercisable at $1.47 per share and expire between March 2001
       and June 2001;



     - 50,001 are exercisable at $2.22 per share and expire on October 15, 2002;



     - 185,186 are exercisable at $3.58 per share and expire on July 31, 2003;



     - 384,367 are exercisable at $5.03 per share and expire on July 1, 2007;



     - 370,834 are exercisable at $8.81 per share and expire between July 2006
       and June 2008; and



     - 71,667 are exercisable at the initial public offering price or, if this
       offering is not completed by February 2000, at $10.50 per share and
       expire between August 2009 and September 2009.



     Mr. Gregory. Mr. Gregory's stock option agreement supersedes options
previously granted to him. Mr. Gregory's stock option agreement provides that
all options granted to him, including his individual employee stock options, are
fully vested and exercisable at the time of grant. Mr. Gregory's individual
employee stock options terminate upon the earliest to occur of:



     - the termination of his employment with us for cause;



     - one year after the termination of his employment due to death or
       disability;



     - in specified circumstances, the sale of all of our outstanding common
       stock; and



     - the expiration of the various seven year option periods provided in his
       stock option agreement.



Mr. Gregory's individual employee stock options are subject to adjustments for
stock dividends, stock splits, stock combinations or other recapitalizations.



     In July 1999, we redeemed an option to purchase 75,000 shares of our common
stock from Mr. Gregory for $550,500. We arrived at this amount by multiplying
the number of shares underlying the option (75,000) by the difference between
the fair market value of our common stock at the time ($8.81 per share) and the
exercise price of the shares ($1.47 per share). In connection with the
redemption of Mr. Gregory's option, our board granted Mr. Gregory another fully
vested option to purchase 50,000 shares of our common stock exercisable until
July 2006 at a price of $8.81 per share. Concurrently, Mr. Gregory relinquished
specified rights under his employment and stock option agreements with us. These
rights include:



     - a preemptive right to participate to the extent of 5% in future equity
       financings by our company; and



     - anti-dilution protection with respect to future issuances of our
       securities.


                                       53
<PAGE>   58

STOCK OPTION PLANS


     Directors Compensation Plan. We adopted the Directors Compensation Plan as
of January 1, 1998. The plan provides for:



     - compensation in the form of an annual retainer payable quarterly;



     - cash fees for attendance at meetings of the board; and



     - grants of stock options, both discretionary and by formula.



We may pay up to 50% of the annual retainer by issuing shares of our common
stock with a fair market value at the time equal to the amount of the fee. The
plan is administered by our board. Our board may delegate all of its power of
administration, with the exception of the power to authorize issuance of
options. No director may vote on or decide any matter relating solely to him
under the plan. No director may vote in any case in which his individual right
to claim any benefit under the plan is particularly involved.



     The maximum number of shares issuable under the Directors Compensation Plan
is 60,000. Options granted under the plan will have a term of 10 years and will
be subject to earlier termination if the optionee's membership on our board
terminates for cause. If the optionee's membership on the board is terminated
for any reason other than cause, his options may be exercised for up to three
years from the date of termination, but only as to the number of shares that
were vested on the date of termination. Discretionary option grants will be
exercisable as determined by our board. Formula option grants will be fully
exercisable on the first anniversary of the date of grant. The exercise price of
an option will be the price determined by our board in the case of discretionary
option grants and the fair market value in the case of formula option grants.



     The Directors Compensation Plan allows our board to make adjustments in the
number of shares to be acquired upon exercise of options in the event of a stock
split, combination or stock dividend.



     Our board may amend or terminate the plan at any time. Any amendment or
termination will not affect options previously granted and outstanding under the
plan.



     As of August 31, 1999, options have been granted under the Directors
Compensation Plan with respect to a total of 13,334 shares of our common stock,
all of which are exercisable at $8.81 per share. All of the currently
outstanding options vest quarterly over a period of 2 1/2 years from the date of
grant. No stock appreciation rights have been granted under the plan.



     Employee Stock Incentive Plan. We adopted the Employee Stock Incentive Plan
in February 1998. The purpose of the plan is to attract qualified consultants,
advisors and employees and to give our key employees who are responsible for
administration and management a proprietary interest in our company. The maximum
number of shares issuable under the plan is 700,000, subject to adjustment. The
maximum number of shares and options to purchase shares that an individual may
receive in a single year under the plan is 100,000.



     The Employee Stock Incentive Plan provides for the award of:



     - "incentive stock options" within the meaning of section 422 of the
       Internal Revenue Code;



     - non-qualified stock options (options that do not qualify under section
       422);



     - restricted stock awards;



     - stock appreciation rights; and



     - any combination of the foregoing.


                                       54
<PAGE>   59


Awards may be granted only to employees, advisors and consultants. Our board has
authorized the compensation committee to administer the Employee Stock Incentive
Plan. The compensation committee has the authority, in its discretion, to
determine:



     - which employees, consultants or advisors will receive an award;



     - the time or times when the awards will be made;



     - what type of award will be granted;



     - the number of shares subject to each award; and



     - the vesting conditions of each award.



     Options. The exercise price per share of our common stock under each option
is determined by the compensation committee. The exercise price may not,
however, be less than the fair market value of a share of common stock on the
date the option is granted. To the extent that the fair market value of our
common stock underlying incentive stock options exceeds $100,000, the incentive
stock options will be treated as non-qualified stock options. No incentive stock
option may be granted to an individual if, at the time of grant, the individual
owns stock possessing more than 10% of the total combined voting power of all
classes of our capital stock unless:



     - the option price is at the time equal to 110% of the fair market value of
       our common stock subject to the option; and



     - the option is not exercisable after the fifth anniversary of the date of
       grant.



     The Employee Stock Incentive Plan provides that, if any of several
specified corporate changes should occur, the compensation committee may, in its
discretion:



     - accelerate the vesting of outstanding options;



     - require the surrender of outstanding options in exchange for a cash
       payment based on a formula specified in the plan;



     - make adjustments to outstanding options to reflect the corporate change;
       or



     - provide that the outstanding options will cover securities or property
       that the optionee would have received in a corporate change if the
       optionee were then the holder of the common stock covered by the option.



For this purpose, the specified corporate changes are:



     - a merger, consolidation or reorganization of our company in which our
       common stock is converted into cash, property or a different class of
       securities of our company or any other company;



     - a sale, lease or exchange of all or substantially all of our assets;



     - the adoption by our stockholders of a plan of liquidation and
       dissolution;



     - the acquisition by a person or group of beneficial ownership of 20% or
       more of our outstanding capital stock (measured by voting power); or



     - an election contest in which individuals who were, prior to the election,
       directors of our company cease to constitute a majority of our board.



     SARs. Stock appreciation rights may be granted either in conjunction with
an option grant or independently of any option grant. The compensation committee
determines the terms of each stock appreciation right. The exercise price may
not, however, be less than the fair market value of a share of common stock on
the date the stock appreciation right is granted.


                                       55
<PAGE>   60


     Restricted Stock. Restricted stock awards consist of awards of our common
stock that are subject to restrictions on disposition and an obligation to
forfeit and surrender those shares under specified circumstances. The
compensation committee is authorized to establish these restrictions and
obligations which may vary from award to award. The compensation committee may
also provide for the lapse of any or all these restrictions and obligations
upon:



     - the achievement by our company of prescribed performance goals;



     - the achievement by the holder of a prescribed employment period; or



     - the occurrence of other specified conditions.



     The compensation committee may also fully vest any or all common stock
subject to a restricted stock award upon the occurrence of any of the specified
corporate changes listed above with respect to options.



     Amendment. The board may terminate or amend the Employee Stock Incentive
Plan at any time. No termination or amendment will materially impair the rights
of a holder of an award previously made. The board may not, without stockholder
approval, amend the plan to increase the maximum aggregate number of shares that
may be issued under the plan or change the class of individuals eligible to
receive awards under the plan.



CHANGE OF CONTROL AND SEVERANCE PLANS



     Our executive officers have entered into change of control agreements with
us that provide for us to pay them 150% of base salary plus accrued bonuses upon
a change of control of our company. The percentage is 200% in the case of Mr.
McCarthy. A "change of control" means the acquisition by any party unrelated to
Capricorn I or Capricorn II of 50% or more of our outstanding common stock or
securities which may be converted to common stock or assets of our company. If
the acquiring company agrees to employ our executive officers on substantially
similar terms, no change of control will occur.



     Our senior executive officers participate in an executive severance plan we
adopted in September 1990. The purpose of the plan is to provide severance pay
to the executive if we should terminate his employment. The plan covers all our
senior executives. It does not apply to voluntary separations, terminations for
cause, sale of our company or the death of the employee. Under this plan, a
senior executive would receive severance pay equal to one month's pay for each
$10,000 of base salary, up to a maximum of twelve months' pay. Senior executives
also receive earned vacation pay at the time of involuntary termination.


DEFERRED COMPENSATION PLAN


     TEST adopted a deferred compensation plan in July 1995 to provide
incentives and rewards to key individuals. Awards are payable in five equal
annual installments plus any earnings that have been allocated to a
participant's account. We have not made any additional awards since January 1,
1998. We intend to terminate the plan upon completion of this offering and to
pay out all accrued amounts to each participant. As of August 31, 1999, the
total amount owed under the plan was $405,229. This balance presently accrues
interest at the prime rate plus 1%.


                                       56
<PAGE>   61

STOCK OPTION GRANTS


     The following table contains certain information concerning stock options
held by the named executive officers as of August 31, 1999. No stock options
have been exercised as of that date.



<TABLE>
<CAPTION>
                                                                                   POTENTIAL REALIZABLE
                                                                                         VALUE AT
                                            INDIVIDUAL GRANTS                         ASSUMED ANNUAL
                         --------------------------------------------------------        RATES OF
                         NUMBER OF    % OF TOTAL                                        STOCK PRICE
                         SECURITIES     OPTIONS                                      APPRECIATION FOR
                         UNDERLYING     GRANTED     EXERCISE                            OPTION TERM
                          OPTIONS         TO        PRICE PER                      ---------------------
         NAME            GRANTED(#)    EMPLOYEES      SHARE      EXPIRATION DATE      5%          10%
         ----            ----------   -----------   ---------   -----------------  ---------   ---------
<S>                      <C>          <C>           <C>         <C>                <C>         <C>
Nathaniel A. Gregory...   480,555        28.1%        $1.47       July 31, 2003    $287,582    $670,189
                          185,186        10.8%        $3.58       July 31, 2003     269,894     628,967
                          164,363         9.6%        $5.03       July 31, 2004     336,568     784,348
                           50,000         2.9%        $8.81       July 31, 2006     179,328     417,910
Patrick M. McCarthy....   133,334         7.8%        $1.47     December 21, 2001    86,603     204,592
                           16,667         1.0%        $8.81       June 1, 2008       92,345     234,019
                           50,000         2.9%        $8.81        May 1, 2009      277,028     702,044
William B. Wiener
  III(1)...............        --          --            --            --                --          --
C. Frank Smith.........    33,334         2.0%        $1.47     December 21, 2001    21,651      51,149
                           33,334         2.0%        $5.03      January 1, 2005     74,085     175,019
David R. Volz, Jr. ....    66,667         4.0%        $5.03      January 1, 2005    148,167     350,033
</TABLE>


- ------------------------------


(1) Mr. Wiener resigned from our company effective May 31, 1999.



                           RELATED PARTY TRANSACTIONS


SECURITIES TRANSACTIONS


     Capricorn I and Capricorn II, which are private investments funds, are
limited partnerships organized under the laws of Delaware. Capricorn I is
managed by its general partner, Capricorn Holdings, G.P., which in turn is
managed by Capricorn Holdings, Inc. Herbert S. Winokur, Jr., a director of our
company, is Chairman and Chief Executive Officer of Capricorn Holdings, Inc.



     Capricorn II is managed by Capricorn Holdings, LLC, a Delaware limited
liability company. Mr. Winokur and Mr. Gregory, our Chairman of the Board and
Chief Executive Officer, are members of Capricorn Holdings, LLC. Mr. Winokur is
its managing member.



     Our company was incorporated in 1988 by Capricorn I. In 1989, Capricorn I
and a group of investors provided us with sufficient funds to enable us to
acquire all the outstanding capital stock of National Tank Company, now our
principal subsidiary, together with Tyler and another company, from C-E for
cash.



     In December 1991, Capricorn I loaned us approximately $5.0 million. In
exchange, we issued to Capricorn I our subordinated promissory notes in an equal
principal amount.



     In 1992, we organized PTH as our subsidiary and thereafter contributed to
PTH all the outstanding stock of Tyler.



     During the period from June 1989 through January 1997, both we and
Capricorn I, on various occasions, acquired shares of our common stock from our
original investor group other than Capricorn I. By the end of January 1997,
Capricorn I was our sole stockholder.



     Between 1992 and 1997, Capricorn I consented to the addition of accrued but
unpaid interest to the principal of our subordinated promissory notes and to
various extensions of the maturities of the notes.


                                       57
<PAGE>   62


     On June 30, 1997, we undertook a significant financing and reorganization.
At that time:



     - PTH, with the consent of Capricorn I, assumed $4.6 million in principal
       amount of our subordinated promissory notes;



     - we distributed all the outstanding capital stock of PTH to Capricorn I;



     - we refinanced our portion of the original subordinated promissory notes
       by issuing a new $5.1 million 13% subordinated promissory note due 2000
       in exchange for the old notes;



     - Capricorn II acquired from us a new $2.4 million 13% subordinated
       promissory note due 2000 and 2,113,334 shares of our common stock for
       $13.0 million in cash; and



     - we acquired all the outstanding capital stock of TEST by using the
       proceeds from the Capricorn II financing and proceeds from borrowings
       under a bank credit facility.



     In March 1998, we issued 1,010,333 shares of our common stock to Capricorn
I and 468,925 shares of our common stock to Capricorn II in exchange for the
surrender and cancellation of our subordinated promissory notes.



     In November 1998, we acquired Cynara by merging it into National Tank
Company.



     In connection with our acquisition of Cynara, we entered into a
registration rights agreement with Capricorn I and Capricorn II and a separate
registration rights agreement with the former stockholders of Cynara. Under
these agreements, Capricorn I, Capricorn II and the stockholders of Cynara are
entitled to demand and "piggy-back" registration rights under the Securities Act
with respect to the shares of our common stock that they own.



     In connection with our acquisition of Cynara in November 1998, Capricorn II
invested $5.3 million in our company in exchange for our convertible promissory
note. We used the proceeds to finance a portion of the acquisition costs. In
December 1998, Capricorn II elected to convert the note, and we issued 504,762
shares of our common stock to Capricorn II.



     See "Management -- Employment Agreement" and "-- Individual Employee Stock
Options" for information regarding:



     - a loan by us to Mr. Gregory;



     - his purchase of shares of our common stock with the proceeds of the loan;



     - our agreement to pay him a bonus on completion of this offering
       sufficient to allow him to pay his loan; and



     - our redemption of a portion of the options held by Mr. Gregory to
       purchase shares of our common stock and the issuance of a new option to
       Mr. Gregory.


CAPRICORN MANAGEMENT, G.P.


     Capricorn Management, G.P. is an entity controlled by Mr. Winokur. It
provides management services to Capricorn I and Capricorn II. We agreed in 1989
to pay $350,000 per year plus specified out-of-pocket expenses to Capricorn
Management to reimburse it for costs and expenses incurred by it and its
employees to perform specified management and other responsibilities. These
services included, during periods of their common ownership, services to PTH,
whose capital stock we distributed to Capricorn I on June 30, 1997, and to
another affiliate which has been sold. Effective July 1, 1997, we amended the
contract to limit the services provided by Capricorn Management to advisory
information and research services and administrative services and to reduce the
cost reimbursement to $75,000 a year. The services provided include office space
and parking in Connecticut for our Chief Executive Officer and reception,


                                       58
<PAGE>   63


telephone and computer services and other normal office support relating to that
space. We paid Capricorn Management:



     - $350,000 for fiscal 1996;



     - $144,000 for fiscal 1997;



     - $163,000 for fiscal 1998; and



     - $56,000 for the nine months ended December 31, 1998.



Our agreement with Capricorn Management has been extended to June 30, 2000.



     In June 1989, we entered into an agreement with Capricorn Management that
was assigned by Capricorn Management to Capricorn Holdings. Mr. Winokur is the
Chairman and Chief Executive Officer of Capricorn Holdings. Under the agreement,
we were required to pay a fee to Capricorn Holdings, contingent upon the
occurrence of specified events. During 1997, those events occurred and we paid a
fee of $374,000. We do not owe any further amounts under this agreement.



     Employees of Capricorn Management participated in some of our medical
insurance and benefit plans in 1996 and 1997, for which Capricorn Management
reimbursed us. The balances for reimbursement due at the end of fiscal 1996,
1997 and 1998 were $25,800, $115,700 and $229,900, respectively. All of these
expenses have been fully reimbursed and there is currently no outstanding
balance.



SUBSIDIARIES OF CAPRICORN I



     PTH. PTH was a wholly owned subsidiary of ours until June 30, 1997. As a
consequence, we filed consolidated federal income tax returns that included PTH
through that date. On that day, we distributed all the outstanding capital stock
of PTH as a dividend on our common stock, all of which was then owned by
Capricorn I. For additional information regarding this distribution, see "Risk
Factors." At the time of the distribution, we obtained an opinion of our counsel
to the effect that the distribution would not be subject to federal income tax
either to us or to Capricorn I. We also entered into a tax allocation agreement
under which PTH agreed to accept liability for any federal income tax resulting
from the failure of the distribution to qualify as a tax free spin-off, other
than any liability resulting from specific actions by us during the two years
following the distribution.



     In September 1999, our board approved a transaction in which PTH will pay
us $0.4 million and we agreed, in connection with a reorganization and
liquidation of PTH, to terminate PTH's obligation under the tax allocation
agreement to accept liability for federal income tax resulting from the
distribution.



     As an unrelated matter, we currently provide tax consulting and analysis
services to PTH for which we are paid $7,000 per month. These services will no
longer be required following completion of the reorganization of PTH.



     Tyler. Tyler, a subsidiary of PTH, is one of three companies, including
National Tank Company, that were acquired by us from C-E in 1989. At that time,
we assumed the obligations for retired employee health and life insurance
discussed under "Risk Factors." In 1996, these obligations were assumed
severally by Tyler, our subsidiary National Tank Company and the other company
so acquired.



     In September 1999, our board approved a transaction in which we agreed, in
connection with the reorganization and liquidation of PTH, to assume
responsibility for Tyler's portion of these retired employee health and life
insurance obligations. In consideration of our agreement to that effect, Tyler
will pay us $1.0 million, representing the accrued liability with respect to
these obligations, as determined by an independent actuarial firm.



MISCELLANEOUS



     Winokur Note and Option. On November 7, 1997, we loaned $1.5 million to Mr.
Winokur. The purpose of the loan was to provide a portion of the funds that Mr.
Winokur used to purchase the limited

                                       59
<PAGE>   64


partnership interests of the former co-general partner of Capricorn I. The
portion of our common stock held by Capricorn I that was attributable to those
interests was 173,050 shares. The arrangements that we entered into with Mr.
Winokur were designed to allow us to acquire those shares of our common stock
when distributed to Mr. Winokur by Capricorn I. The price of those shares was
$8.81 per share plus the interest expense incurred by Mr. Winokur in financing
the purchase of the co-general partner's interest.



     Those arrangements were as follows:  Mr. Winokur issued his full recourse
promissory note to us in the amount of $1.5 million. The note bore interest at
10% per year or, at our election, a rate determined by formula. The note matured
on March 31, 1998. At that time, Mr. Winokur refinanced the note obligation by
issuing a new promissory note payable to us in the amount of $1.6 million,
consisting of the original principal plus accrued but unpaid interest. The new
promissory note bears interest at 11% per year and is due on the date on which
the 173,050 shares of our common stock described above have been distributed by
Capricorn I to Mr. Winokur.



     As of the same date, March 31, 1998, we purchased, for $200,000, an option
from Mr. Winokur to purchase 173,050 shares of our common stock at a price of
$8.81 per share. The option becomes exercisable on the date on which Capricorn
I's holdings of our common stock have been distributed to its partners.



     We anticipate that we will exercise this option promptly after Capricorn I
makes a distribution of our common stock to its partners. Our total cost of
those 173,050 shares will be $1,724,571 or $9.97 per share. This is composed of
the $1,524,571 we must pay to exercise the option in full and the $200,000 we
paid for the option. We anticipate that we will offset the exercise price of the
option against Mr. Winokur's obligations to pay the principal and interest on
his note.



     Cynara Management Fee. Prior to our acquisition of Cynara, Cynara paid a
monthly management fee of $25,000 to Heller Hickox Dimeling Schreiber and Park.
George K. Hickox, Jr., who is director of our company, is a general partner of
Heller Hickox Dimeling Schreiber and Park. Cynara paid management fees of
$75,000 during 1996, $187,500 during 1997, and $250,000 during 1998 and
reimbursed expenses of Mr. Hickox's firm. The management agreement was
terminated upon completion of the acquisition of Cynara.



     We believe that the transactions described above were no less favorable to
us than those that would have otherwise been obtainable in arms' length
transactions with unaffiliated third parties.


                                       60
<PAGE>   65

                       PRINCIPAL AND SELLING STOCKHOLDERS


     The following table sets forth information regarding the beneficial
ownership of our common stock as of August 31, 1999, and as adjusted to reflect
the sale of our common stock in this offering. The following table presents
information on:



     - each director;



     - each named executive officer;



     - each person who is known by us to own beneficially 5% or more of our
       common stock;



     - all our directors and executive officers as a group; and



     - Capricorn I, as the selling stockholder.



<TABLE>
<CAPTION>
                                             SHARES BENEFICIALLY                    SHARES BENEFICIALLY
                                                    OWNED                                  OWNED
                                            PRIOR TO THE OFFERING    SHARES TO BE   AFTER THE OFFERING
                                            ----------------------   SOLD IN THE    -------------------
      NAME OF BENEFICIAL OWNER(1)(2)          NUMBER      PERCENT      OFFERING      NUMBER     PERCENT
      ------------------------------        -----------   --------   ------------   ---------   -------
<S>                                         <C>           <C>        <C>            <C>         <C>
Capricorn I(3)............................   5,563,667     59.9%             --            --        %
Capricorn II(4)...........................   3,087,021     33.2%             --     3,087,021    21.6%
Herbert S. Winokur, Jr.(5)................   8,650,688     93.1%             --            --        %
Nathaniel A. Gregory(6)(7)................   4,103,957     44.2%             --     4,103,957    26.8%
E. Hale Staley(7).........................      33,334         *             --        33,334       *
Patrick M. McCarthy(7)....................     137,501         *             --       137,501       *
William B. Wiener III(8)..................          --        --             --            --      --
C. Frank Smith(7).........................      50,001         *             --        50,001       *
R. Volz, Jr.(7)...........................      33,334         *             --        33,334       *
Howard I. Bull............................       4,000         *             --         4,000       *
Keith K. Allan............................       4,000         *             --         4,000       *
George K. Hickox, Jr. ....................      83,708         *             --        83,708       *
All directors and executive officers as a
  group (14 persons)(5)(6)(7).............  10,057,252      100%             --                      %
</TABLE>


- ------------------------------

 *  Less than 1%.
(1) Except as otherwise noted, each stockholder has sole voting and investment
    power with respect to the shares beneficially owned.
(2) The address of Capricorn I, Capricorn II and Mr. Winokur is 30 East Elm
    Street, Greenwich, Connecticut 06830.

(3) A Delaware limited partnership of which Capricorn Holdings L.P. is the
    general partner. Mr. Winokur, a director of our company, controls the
    general partner of Capricorn Holdings L.P.


(4) A Delaware limited partnership of which Capricorn Holdings LLC is the
    general partner. Messrs. Winokur and Gregory, directors of our company, are
    the managing member and a member of Capricorn Holdings LLC, respectively.


(5) The 8,650,688 shares indicated as beneficially owned by Mr. Winokur are
    owned directly by Capricorn I and Capricorn II and are included due to Mr.
    Winokur's affiliation with Capricorn I and Capricorn II.


(6) Of the 4,103,957 shares indicated as beneficially owned by Mr. Gregory,
    3,087,021 are owned directly by Capricorn II and are included because of Mr.
    Gregory's affiliation with Capricorn II.


(7) The shares beneficially owned by Messrs. Gregory, Staley, McCarthy, Smith
    and Volz include 880,104, 33,334, 137,501, 50,001 and 33,334 shares,
    respectively, that may be acquired within 60 days through the exercise of
    stock options. The shares owned by the executive officers and directors as a
    group include 1,186,024 shares that may be acquired within 60 days through
    the exercise of stock options.


(8) Mr. Wiener resigned from our company effective May 31, 1999.


                                       61
<PAGE>   66

                          DESCRIPTION OF CAPITAL STOCK

GENERAL


     Our authorized capital stock consists of 50,000,000 shares of common stock
and 5,000,000 shares of preferred stock. Of the 50,000,000 shares of common
stock, 45,000,000 shares are designated Class A common stock and 5,000,000
shares are designated Class B common stock. As of August 31, 1999, 9,287,520
shares of common stock were outstanding, of which 500,000 shares were Class B
common stock and the balance were Class A common stock. The shares to be sold in
this offering are Class A common stock.



     Prior to this offering, there has been no public market for our common
stock. Although we have made application to list the common stock on the NYSE,
we cannot assure you that a market for our common stock will develop or, if one
develops, that it will be sustained.


COMMON STOCK


     We amended our charter in connection with the acquisition of Cynara to
divide our common stock into two classes. The shares issued to the former Cynara
stockholders were shares of Class B common stock. There will be, until the
completion of this offering, significant differences between the Class A and
Class B common stock. At that time, however, these differences will terminate,
except the rights of the holders of Class B common stock:



     - to elect a director to our board; and



     - to vote as a class with respect to any charter amendment that would
       authorize additional Class B common stock or would adversely affect their
       right to elect a director.



     The rights attaching to the Class B common stock are personal to the
initial holders of shares of that class and will not, with express exceptions,
continue to attach to shares transferred to others. Each share of Class B common
stock may be converted at any time into one share of Class A common stock. On
January 1, 2002, the Class B common stock converts automatically into Class A
common stock to constitute a single class of common stock. There being no other
differences between the classes of our common stock, we do not, in the
description that follows, distinguish between those classes.



     Each holder of common stock is entitled to one vote for each share of
common stock on all matters voted on by our stockholders. The holders of common
stock do not have cumulative voting rights in the election of directors. Subject
to any preferences accorded to the holders of the preferred stock, holders of
common stock are entitled to receive ratably any dividends that our board
declares out of legally available funds. NATCO Group Inc. has never paid cash
dividends on our common stock, and we do not intend to pay dividends in the
foreseeable future. Our credit facilities contain provisions that have the
effect of restricting us from paying dividends on the common stock. Holders of
common stock will share equally in our assets on the liquidation, dissolution or
winding up of our company, after payment of debts, expenses and the liquidation
preference plus any accrued dividends on any outstanding shares of preferred
stock. The holders of common stock have no preemptive, subscription, redemptive
or conversion rights. The outstanding shares of common stock are, and the shares
of common stock being sold in this offering will be, validly issued, fully paid
and nonassessable.


PREFERRED STOCK


     General. Our board has authority, without stockholder approval, to issue
shares of preferred stock in one or more series and to fix the number of shares
and terms of each such series. The board may determine the designation and other
terms of each series, including:



     - dividend rights;



     - conversion rights;


                                       62
<PAGE>   67


     - voting powers;



     - redemption rights; and



     - liquidation preferences.



     The issuance of preferred stock, while providing desired flexibility in
connection with possible acquisitions and other corporate purposes, could
adversely affect the voting power of holders of common stock. It could also
affect the likelihood that holders of common stock will receive dividend
payments and payments upon liquidation. We have no present plans to issue any
preferred stock.



     One of the consequences of our authorized but unissued common stock and
undesignated preferred stock may be to enable our board to make more difficult
or to discourage an attempt to obtain control of our company. Use of the common
or preferred stock for this purpose might also protect incumbent management. If,
in the exercise of its fiduciary obligations, our board were to determine that a
takeover proposal was not in our best interest, the board could authorize the
issuance of those shares without stockholder approval. The shares could be
issued in one or more transactions that might prevent or make the completion of
the change of control transaction more difficult or costly by:



     - diluting the voting or other rights of the proposed acquiror or insurgent
       stockholder group;



     - creating a substantial voting block in institutional or other hands that
       might undertake to support the position of the incumbent board; and



     - effecting an acquisition that might complicate or preclude the takeover.



In this regard, our charter grants our board broad power to establish the rights
and preferences of the authorized and unissued preferred stock. Our board could
establish one or more series of preferred stock which entitle holders:



     - to vote separately as a class on any proposed merger or consolidation;



     - to cast a proportionately larger vote together with the common stock on
       any transaction or for all purposes;



     - to elect directors having terms of office or voting rights greater than
       those of other directors;



     - to convert preferred stock into a greater number of shares of common
       stock or other securities;



     - to demand redemption at a specified price under prescribed circumstances
       related to a change of control of our company; or



     - to exercise other rights designed to impede a takeover.



     Series A Junior Participating Preferred Stock. Our board has, in
conjunction with its adoption of our rights agreement, designated 500,000 shares
of preferred stock as the Series A Junior Participating Preferred Stock. The
terms of this Series A preferred stock are designed so that the value of each
one-hundredth of a share that may be purchased upon exercise of a right will
approximate the value of one share of common stock. The Series A preferred stock
is nonredeemable and will rank junior to all other series of preferred stock.
Each whole share of Series A preferred stock is entitled to receive a cumulative
quarterly preferential dividend in an amount per share equal to the greater of:



     - $1.00 in cash, or



     - 100 times the dividend declared on the common stock.


                                       63
<PAGE>   68


Upon liquidation, the holders of the Series A preferred stock are entitled to
receive a preferential liquidation payment equal to the greater of:



     - $100.00 per share, or



     - 100 times the payment made on the common stock,



plus, in either case, the accrued and unpaid dividends and distributions on the
Series A preferred stock. Upon any merger, consolidation or other transaction in
which the common stock is exchanged for or changed into other stock or
securities, cash or other property, each whole share of Series A preferred stock
is entitled to receive 100 times the amount received per share of common stock.
Each whole share of Series A preferred stock is entitled to 100 votes on all
matters submitted to a vote of the stockholders of our company. Holders of
Series A preferred stock will generally vote together as one class with the
holders of common stock and any other capital stock on all matters submitted to
a vote of stockholders of our company.



CHARTER AND BYLAW PROVISIONS



     Stockholder Action by Written Consent. Our bylaws provide that, except as
may otherwise be provided with respect to the rights of the holders of preferred
stock, no action that is required or permitted to be taken by our stockholders
at any annual or special meeting may be effected by written consent of
stockholders in lieu of a meeting of stockholders, unless the action to be
effected by written consent of stockholders and the taking of such action by
such written consent have expressly been approved in advance by our board. This
provision makes it difficult for stockholders to initiate or effect an action by
written consent that is opposed by our board.



     Amendment of the Bylaws. Under Delaware law, the power to adopt, amend or
repeal bylaws is conferred upon the stockholders. A corporation may, however, in
its certificate of incorporation also confer upon the board of directors the
power to adopt, amend or repeal its bylaws. Our charter and bylaws grant our
board the power to adopt, amend and repeal our bylaws at any regular or special
meeting of the board on the affirmative vote of a majority of the directors then
in office. Our stockholders may adopt, amend or repeal our bylaws but only at
any regular or special meeting of stockholders by an affirmative vote of a
majority of the common stock present at the meeting or by unanimous written
consent.



     Special Meetings of Stockholders. Our bylaws provide that a special meeting
of stockholders may be called only by a written request signed by the holders of
at least 10% of our outstanding common stock.


RIGHTS TO PURCHASE PREFERRED STOCK


     On May 5, 1998, our board declared a dividend of one preferred share
purchase right for each outstanding share of common stock held of record on May
15, 1998. It also approved the further issuance of rights with respect to all
shares of common stock that we issue after that date and prior to the rights
becoming exercisable. The rights were issued under a rights agreement between
our company and ChaseMellon Shareholder Services, L.L.C., as rights agent. When
the rights become exercisable, each right will entitle the registered holder to
purchase from us one-hundredth of a share of Series A preferred stock at a price
of $72.50 in cash, subject to adjustment. Until the occurrence of specified
events, the rights:



     - are not exercisable;



     - will be evidenced by the certificates for our common stock; and



     - will not be transferable apart from our common stock.


                                       64
<PAGE>   69


     Detachment of Rights; Exercise. The rights are currently attached to all
certificates representing outstanding shares of common stock and no separate
right certificates have been distributed. The rights will separate from the
common stock on a distribution date, which will occur upon the earlier of:



     - ten business days following the public announcement that a person or
       group has acquired beneficial ownership of 15% or more of our outstanding
       voting securities; or



     - ten business days following the commencement or announcement of an
       intention to commence a tender offer or exchange offer, which, if
       completed, would result in the beneficial ownership by a person or group
       of 15% or more of our outstanding voting securities.



     The rights are not exercisable until the distribution date. As soon as
practicable following the distribution date, separate certificates evidencing
the rights will be mailed to holders of record of our common stock as of the
close of business on the distribution date. After mailing, the separate
certificates alone will evidence the rights.



     If a person or group were to acquire 15% or more of our voting securities,
each right then outstanding would become a right to buy that number of shares of
common stock that at the time of the acquisition of 15% or more of our voting
securities would have a market value of two times the purchase price of the
right. Rights beneficially owned by the acquiring person or group would,
however, become null and void.



     If, following the occurrence of a distribution date, we were acquired in a
merger or other business combination transaction, the rights agreement requires
that the documents relating to the business combination must contain provisions
relating to the rights. Those documents must provide that, after the merger or
other business combination, each holder of a right would have the right to
receive, upon exercise at the then current purchase price, that number of shares
of common stock of the acquiring company that at the time would have a market
value of two times the purchase price of the right.



     Antidilution and Other Adjustments. The number of shares or fractions of
Series A preferred stock or other securities or property issuable upon exercise
of the rights, and the purchase price payable, are subject to customary
adjustments from time to time to prevent dilution. The number of outstanding
rights and the number of shares or fractions of Series A preferred stock
issuable upon exercise of each right are also subject to adjustment if any of
the following events occurs prior to the distribution date:



     - a stock dividend on our common stock payable in our common stock; or



     - any subdivision, consolidation or combination of our common stock.



     Exchange Option. At any time after the acquisition by a person or group of
beneficial ownership of 15% or more but less than 50% of our outstanding voting
securities, our board may, at its option, issue common stock in mandatory
redemption of all or part of the rights. Any rights owned by the acquiring
person or group would become null and void. The redemption must be at an
exchange ratio of one share of our common stock for each two shares of our
common stock for which each right is then exercisable, subject to adjustment.



     Redemption of Rights. At any time prior to the first public announcement
that a person or group has become the beneficial owner of 15% or more of our
outstanding voting securities, our board may redeem all but not less than all
the then outstanding rights at a price of $.01 per right. The redemption of the
rights may be made effective at the time, on the basis and with the conditions
that the board may establish. Immediately after our board's decision to redeem
the rights, the right to exercise the rights will terminate and the only right
of the holders of rights will be to receive the redemption price.



     Expiration; Amendment of Rights. The rights will expire on May 15, 2008,
unless earlier extended, redeemed or exchanged. Our board may amend the terms of
the rights without the consent of the holders of the rights. This includes
amendments to extend the expiration date of the rights, and, if a distribution
date has not occurred, to extend the period during which the rights may be
redeemed. After the first public announcement that a person or group has become
the beneficial owner of 15% or more of our


                                       65
<PAGE>   70


outstanding voting securities, no amendment may materially and adversely affect
the interests of holders of the rights.


DELAWARE ANTITAKEOVER LAW


     We are subject to Section 203 of the Delaware General Corporation Law. That
section prohibits Delaware corporations from engaging in a wide range of
specified transactions with any interested stockholder. An interested
stockholder is any person, other than the corporation and any of its majority-
owned subsidiaries, who owns 15% or more of any class or series of stock
entitled to vote generally in the election of directors.



EFFECTS OF RIGHTS AND ANTITAKEOVER LAW



     The rights have anti-takeover effects. The rights will cause substantial
dilution to a person or group that attempts to acquire us without the approval
of our board. Moreover, the rights and the above provisions of the Delaware law
may tend to deter any potential unfriendly offers or other efforts to obtain
control of our company that are not approved by our board. This may deprive the
stockholders of opportunities to sell shares of our common stock at prices
higher than the prevailing market price. On the other hand, the rights and these
provisions will tend to assure continuity of management and corporate policies
and to induce any person seeking control of our company or a business
combination with our company to negotiate on terms acceptable to our board of
directors.


                        SHARES ELIGIBLE FOR FUTURE SALE


     Upon completion of this offering, we will have 14,287,520 shares of common
stock outstanding (            shares if the underwriters fully exercise their
over-allotment option). Of these outstanding shares of common stock, the
        shares to be sold in this offering (        if the underwriters fully
exercise their over-allotment option) will be freely tradeable without
restriction or further registration under the Securities Act. This assumes none
of them is purchased by an "affiliate" of our company, as that term is defined
in Rule 144 under the Securities Act.



     The remaining         shares of common stock outstanding after this
offering will be "restricted securities" within the meaning of Rule 144 and may
not be sold in a public distribution except in compliance with the registration
requirements of the Act or an applicable exemption under the Act, including an
exemption pursuant to Rule 144. Restricted securities are eligible for sale in
the public market pursuant to Rule 144 no sooner than one year from the date of
acquisition. Sales may be effected after expiration of this "holding period" in
compliance with specified volume and transactional limitations of Rule 144.



     After completion of this offering, the current stockholders will own the
shares of our common stock shown below subject to the "holding-period" shown:



<TABLE>
<CAPTION>
            STOCKHOLDER OR GROUP              NUMBER OF SHARES              HOLDING PERIOD
- --------------------------------------------  ----------------   ------------------------------------
<S>                                           <C>                <C>
Capricorn I.................................                     Expired
Capricorn II................................     3,087,021       Expired as to 2,582,259 shares;
                                                                 holding period as to balance expires
                                                                 November 1999
Former Cynara Stockholders..................       500,000*      Expires November 1999
Nathaniel A. Gregory........................       136,832       Expires July 2000
</TABLE>


- ---------------


* Based on operations through September 30, 1999, approximately 300,000
  additional shares have been earned and will be issued on November 30, 1999. Up
  to a total of 950,000 additional shares may be earned at March 31, 2000 and
  December 31, 2000.


                                       66
<PAGE>   71


     All these stockholders have agreed with the underwriters that they will
not, without the consent of Donaldson, Lufkin & Jenrette Securities Corporation,
sell any shares of our common stock for a period of 180 days following the date
of this prospectus. An aggregate of         shares of our common stock that are
currently outstanding will be available for sale in Rule 144 transactions
following expiration of that 180 day period. Moreover, all the stockholders
listed above, including the former Cynara stockholders, are entitled to rights
of registration of the offering and sale of their shares under the Securities
Act.



     As of September 30, 1999, we have reserved an aggregate of 1,795,947 shares
of common stock for issuance upon exercise of options of which 1,347,527 are
exercisable immediately upon completion of this offering. See
"Management -- Executive Compensation -- Stock Option Plans."



                                  UNDERWRITING



     Subject to the terms and conditions of an underwriting agreement, dated
            , 1999, the underwriters named below, who are represented by
Donaldson, Lufkin & Jenrette Securities Corporation, Salomon Smith Barney Inc.
and Simmons & Company International, have severally agreed to purchase an
aggregate of      shares from us and      shares from the selling stockholder.
The number of shares of common stock that each underwriter has agreed to
purchase is set forth opposite its name below.



<TABLE>
<CAPTION>
                                                              NUMBER OF
UNDERWRITERS                                                   SHARES
- ------------                                                  ---------
<S>                                                           <C>
Donaldson, Lufkin & Jenrette Securities Corporation.........
Salomon Smith Barney Inc. ..................................
Simmons & Company International.............................
                                                              --------
          Total.............................................
                                                              ========
</TABLE>



     The underwriting agreement provides that the obligations of the
underwriters to purchase and accept delivery of the shares of common stock
included in this offering are subject to approval by their counsel of certain
legal matters and to certain other conditions. The underwriters are obligated to
purchase and accept delivery of all the shares of common stock (other than those
covered by the over-allotment option described below) if they purchase any of
the shares of common stock.



     The underwriters initially propose to offer some of the shares of common
stock directly to the public at the public offering price set forth on the cover
page of this prospectus and some of the shares of common stock to certain
dealers (including the underwriters) at the public offering price less a
concession not in excess of $     per share. The underwriters may allow, and
such dealers may re-allow, a concession not in excess of $     per share on
sales to certain other dealers. After the initial offering of the common stock
to the public, the representatives may change the public offering price and
other selling terms at any time without notice. The underwriters do not intend
to confirm sales to any accounts over which they exercise discretionary
authority.



     We have granted to the underwriters an option, exercisable within 30 days
after the date of this prospectus, to purchase, from time to time, in whole or
in part, up to           additional shares of common stock at the public
offering price less underwriting fees. The underwriters may exercise this option
solely to cover over-allotments, if any, made in connection with this offering.
To the extent that the underwriters exercise this option, each underwriter will
become obligated, subject to certain conditions, to purchase a number of
additional shares of common stock approximately proportionate to its initial
purchase commitment.


                                       67
<PAGE>   72


     The following table shows the underwriting fees we will pay to the
underwriters in connection with this offering. The amounts are shown assuming
both no exercise and full exercise of the underwriters' option to purchase
additional shares of our common stock.



<TABLE>
<CAPTION>
                                                              NO EXERCISE   FULL EXERCISE
<S>                                                           <C>           <C>
Per share...................................................   $              $
Total.......................................................   $              $
</TABLE>



     We estimate our expenses relating to the offering to be $800,000.



     We and the selling stockholder have agreed to indemnify the underwriters
against certain liabilities, including liabilities under the Securities Act, or
to contribute to payments that the underwriters may be required to make with
respect to these liabilities.



     Our officers, directors and stockholders (including the selling
stockholder) have agreed that they will not, without the prior written consent
of Donaldson, Lufkin & Jenrette Securities Corporation, offer, sell or otherwise
dispose of: (1) any shares of common stock; (2) options or warrants to acquire
shares of common stock; or (3) securities convertible into or exchangeable for
shares of common stock owned by them, for a period of 180 days after the date of
this prospectus. We have agreed not to offer, sell or otherwise dispose of any
of the above securities for a period of 180 days after the date of this
prospectus. See "Shares Eligible for Future Sale."



     At our request, the underwriters have reserved up to 5% of the shares
offered hereby for sale at the initial public offering price to certain of our
employees and members of their immediate families. The number of shares
available for sale to the general public will be reduced to the extent these
individuals purchase such reserved shares. Any reserved shares not purchased
will be offered by the underwriters to the general public on the same basis as
the other shares offered hereby.



     Application will be made to list our common stock on the NYSE under the
symbol "NTG." In order to meet the requirements for listing the common stock on
the NYSE, the underwriters have undertaken to sell lots of 100 or more shares to
a minimum of 2,000 beneficial owners.



     Other than in the United States, no action has been taken by us, the
selling stockholder or the underwriters that would permit a public offering of
the shares of common stock included in this offering in any jurisdiction where
action for that purpose is required. The shares of common stock included in this
offering may not be offered or sold, directly or indirectly, nor may this
prospectus or any other offering material or advertisements in connection with
the offer and sale of any shares of common stock be distributed or published in
any jurisdiction, except under circumstances that will result in compliance with
the applicable rules and regulations of that jurisdiction. Persons who receive
this prospectus are advised to inform themselves about and to observe any
restrictions relating to this offering of our common stock and the distribution
of this prospectus. This prospectus is not an offer to sell or a solicitation of
an offer to buy any shares of common stock included in this offering in any
jurisdiction where that would not be permitted or legal.



     DLJdirect Inc., an affiliate of Donaldson, Lufkin & Jenrette Securities
Corporation and a member of the selling group, is facilitating the distribution
of the shares sold in the offering over the Internet. The underwriters have
agreed to allocate a limited number of shares to DLJdirect Inc. for sale to its
brokerage account holders.



     In connection with this offering, the underwriters may engage in
transactions that stabilize, maintain or otherwise affect the price of the
common stock. Specifically, the underwriters may over-allot this offering,
creating a syndicate short position. The underwriters may also bid for and
purchase shares of common stock in the open market to cover syndicate short
positions or to stabilize the price of the common stock. In addition, the
underwriting syndicate may reclaim selling concessions from syndicate members
and selected dealers if they repurchase previously distributed common stock in
syndicate covering transactions, in stabilizing transactions or otherwise. These
activities may stabilize or maintain the market


                                       68
<PAGE>   73


price of the common stock above independent market levels. The underwriters are
not required to engage in these activities and may end any of these activities
at any time.



     Prior to this offering, there has been no established market for our common
stock. The initial public offering price for the shares of common stock offered
by this prospectus will be determined by negotiation between us and the
representatives of the underwriters. The factors to be considered in determining
the initial public offering price include:



     - the history of and the prospects for the industry in which we compete;



     - our past and present operations;



     - our historical results of operations;



     - the recent market prices of securities of generally comparable companies;
       and



     - general conditions of the securities market at the time of this offering.



     Affiliates of Donaldson, Lufkin & Jenrette Securities Corporation own
limited partnership interests in Capricorn I and Capricorn II. Affiliates of
Salomon Smith Barney Inc. own limited partnership interests in Capricorn II.


                                 LEGAL MATTERS


     The validity of the shares of common stock offered by this prospectus is
being passed upon for us by Vinson & Elkins L.L.P., Houston, Texas. Certain
legal matters in connection with the shares of common stock offered by this
prospectus will be passed upon for the underwriters by Akin, Gump, Strauss,
Hauer & Feld, L.L.P.


                                    EXPERTS


     The consolidated financial statements of NATCO Group Inc. and its
subsidiaries as of March 31, 1998 and December 31, 1998 and for each of the
fiscal years in the two-year period ended March 31, 1998 and the nine-month
period ended December 31, 1998 have been included herein and in the registration
statement of which this prospectus is a part in reliance upon the reports of
KPMG LLP, independent certified public accountants, appearing elsewhere herein,
and upon the authority of said firm as experts in accounting and auditing.



     The financial statements of The Cynara Company at December 31, 1997 and
1996, and for the year ended December 31, 1997 and for the period from March 5,
1996 (date of inception) to December 31, 1996, appearing in this prospectus and
registration statement have been audited by Ernst & Young LLP, independent
auditors, as set forth in their report thereon appearing elsewhere herein, and
are included in reliance upon such report given upon the authority of such firm
as experts in accounting and auditing.



     The financial statements of Porta-Test International Inc. as of June 30,
1999 and for the year then ended have been included herein and in the
registration statement of which this prospectus is a part in reliance upon the
report of KPMG LLP, independent certified public accountants, appearing
elsewhere herein, and upon the authority of said firm as experts in accounting
and auditing.



     The combined financial statements of Engineering Specialties, Inc. and
Engineering Specialties FSC, Inc. as of December 31, 1998 and for the year then
ended have been included herein and in the registration statement of which this
prospectus is a part in reliance upon the report of KPMG LLP, independent
certified public accountants, appearing elsewhere herein, and upon the authority
of said firm as experts in accounting and auditing.


                                       69
<PAGE>   74

                             AVAILABLE INFORMATION


     This prospectus is part of a registration statement we have filed with the
SEC relating to our common stock. As permitted by SEC rules, this prospectus
does not contain all of the information we have included in the registration
statement and the accompanying exhibits and schedules we filed with the SEC. You
may refer to the registration statement, exhibits and schedules for more
information about us and our common stock. You can read and copy the
registration, exhibits and schedules at the SEC's Public Reference Room at 450
Fifth Street, N.W., Washington, D.C. 20549 and at the SEC's regional offices
located at Seven World Trade Center, New York, New York 10048, and at 500 West
Madison Street, Chicago, Illinois 60661. You can obtain information about the
operation of the SEC's Public Reference Room by calling the SEC at
1-800-SEC-0330. The SEC also maintains an Internet site that contains reports,
proxy and information statements, and other information regarding issuers that
file electronically with the SEC. The address of that site is
http://www.sec.gov.



     Following this offering, we will be required to file current reports,
quarterly reports, annual reports, proxy statements and other information with
the SEC. You may read and copy those reports, proxy statements and other
information at the SEC's Public Reference Room and regional offices or through
its Internet site. We intend to furnish our stockholders with annual reports
that will include a description of our operations and audited consolidated
financial statements certified by an independent public accounting firm.


                                       70
<PAGE>   75

                         INDEX TO FINANCIAL STATEMENTS


<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
NATCO GROUP INC. AND SUBSIDIARIES
Independent Auditors' Report................................   F-2
Consolidated Balance Sheets as of March 31, 1998, December
  31, 1998, and June 30, 1999 (unaudited)...................   F-3
Consolidated Statements of Operations for the years ended
  March 31, 1997 and 1998, for the nine months ended
  December 31, 1998, and for the six months ended June 30,
  1998 and 1999 (unaudited).................................   F-4
Consolidated Statements of Stockholders' Equity and
  Comprehensive Income for the years ended March 31, 1997
  and 1998, for the nine months ended December 31, 1998, and
  for the six months ended June 30, 1999 (unaudited)........   F-5
Consolidated Statements of Cash Flows for the years ended
  March 31, 1997 and 1998, for the nine months ended
  December 31, 1998, and for the six months ended June 30,
  1998 and 1999 (unaudited).................................   F-6
Notes to Consolidated Financial Statements..................   F-7
THE CYNARA COMPANY
Report of Independent Auditors..............................  F-30
Balance Sheets as of December 31, 1996 and 1997, and
  September 30, 1998 (unaudited)............................  F-31
Statements of Operations for the period from March 5, 1996
  (date of inception) to December 31, 1996 and for the year
  ended December 31, 1997, and for the nine months ended
  September 30, 1997 and 1998 (unaudited)...................  F-32
Statements of Stockholders' Equity as of December 31, 1996
  and 1997, and September 30, 1998 (unaudited)..............  F-33
Statements of Cash Flows for the period from March 5, 1996
  (date of inception) to December 31, 1996, and for the year
  ended December 31, 1997, and for the nine months ended
  September 30, 1997 and 1998 (unaudited)...................  F-34
Notes to Financial Statements...............................  F-35
PORTA-TEST INTERNATIONAL INC.
Independent Auditors Report.................................  F-42
Balance Sheet as of June 30, 1999...........................  F-43
Statement of Operations for the year ended June 30, 1999....  F-44
Statement of Stockholders' Equity and Comprehensive Loss as
  of and for the year ended June 30, 1999...................  F-45
Statement of Cash Flows for the year ended June 30, 1999....  F-46
Notes to Financial Statements...............................  F-47
ENGINEERING SPECIALTIES, INC. AND ENGINEERING SPECIALTIES
  FSC, INC.
Independent Auditors Report.................................  F-52
Combined Balance Sheets as of December 31, 1998 and June 30,
  1999 (unaudited)..........................................  F-53
Combined Statements of Operations for the year ended
  December 31, 1998 and for the six months ended June 30,
  1998 and 1999 (unaudited).................................  F-54
Combined Statements of Stockholders' Equity and
  Comprehensive Income for the year ended December 31, 1998
  and for the six months ended June 30, 1999 (unaudited)....  F-55
Combined Statements of Cash Flows for the year ended
  December 31, 1998 and for the six months ended June 30,
  1998 and 1999 (unaudited).................................  F-56
Notes to Combined Financial Statements......................  F-57
</TABLE>


                                       F-1
<PAGE>   76

                          INDEPENDENT AUDITORS' REPORT

The Board of Directors
NATCO Group Inc.:


     We have audited the accompanying consolidated balance sheets of NATCO Group
Inc., and subsidiaries as of March 31, 1998 and December 31, 1998 and the
related consolidated statements of operations, stockholders' equity and
comprehensive income, and cash flows for the years ended March 31, 1997 and 1998
and the nine months ended December 31, 1998. These consolidated financial
statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these consolidated financial
statements based on our audits.


     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.


     In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of NATCO Group
Inc. and subsidiaries as of March 31, 1998 and December 31, 1998 and the results
of their operations and their cash flows for the years ended March 31, 1997 and
1998 and the nine months ended December 31, 1998 in conformity with generally
accepted accounting principles.



                                            KPMG LLP


Houston, Texas

March 5, 1999


                                       F-2
<PAGE>   77

                       NATCO GROUP INC. AND SUBSIDIARIES

                          CONSOLIDATED BALANCE SHEETS

                   (DOLLARS IN THOUSANDS, EXCEPT SHARE DATA)



<TABLE>
<CAPTION>
                                                              MARCH 31,   DECEMBER 31,    JUNE 30,
                                                                1998          1998          1999
                                                                                         (UNAUDITED)
<S>                                                           <C>         <C>            <C>
                           ASSETS

Current assets:
  Cash and cash equivalents.................................   $   941      $  2,380      $  1,428
  Restricted cash...........................................       549           883            --
  Trade accounts receivable, less allowance for doubtful
    accounts of $965, $579 and $560 as of March 31, 1998,
    December 31, 1998, and June 30, 1999 respectively.......    43,945        42,585        35,208
  Inventories...............................................    20,096        22,254        19,731
  Notes receivable from director............................     1,576         1,717         1,803
  Net deferred income tax assets............................     2,590         2,871         1,894
  Income tax receivable.....................................        --         1,055         1,671
  Prepaid expenses and other current assets.................     1,655           857         1,138
                                                               -------      --------      --------
         Total current assets...............................    71,352        74,602        62,873
Property, plant and equipment, net..........................     9,332        18,294        18,120
Goodwill....................................................     7,416        18,194        16,648
Net deferred income tax assets..............................     6,162         6,230         6,797
Other assets, net...........................................     1,151         1,092         1,030
                                                               -------      --------      --------
         Total assets.......................................   $95,413      $118,412      $105,468
                                                               =======      ========      ========

            LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Current installments of long-term debt....................   $ 1,682      $  4,693      $  4,693
  Revolving credit bank loan................................     4,147         1,585         1,929
  Accounts payable..........................................    24,182        20,351        14,533
  Accrued expenses and other................................    13,573        13,758        10,825
  Customer advances.........................................     2,057         2,749           721
  Income taxes payable......................................     1,269            --            --
                                                               -------      --------      --------
         Total current liabilities..........................    46,910        43,136        32,701
Long-term debt, excluding current installments..............    27,890        35,499        32,443
Postretirement benefit liability............................    15,194        15,587        15,986
                                                               -------      --------      --------
         Total liabilities..................................    89,994        94,222        81,130
                                                               -------      --------      --------
Stockholders' equity:
  Preferred stock $.01 par value. 5,000,000 shares
    authorized; no shares outstanding.......................        --            --            --
  Class A Common stock, $.01 par value. Authorized
    45,000,000 shares; issued and outstanding 6,666,668,
    8,650,688 and 8,650,688 shares as of March 31, 1998,
    December 31, 1998 and June 30, 1999, respectively.......        67            86            86
  Class B Common stock, $.01 par value. Authorized 5,000,000
    shares; issued and outstanding 0, 500,000 and 500,000
    shares as of March 31, 1998, December 31, 1998, and June
    30, 1999, respectively..................................        --             5             5
  Additional paid-in capital................................    20,272        38,888        38,651
  Accumulated deficit.......................................    (9,470)       (8,818)       (8,672)
  Treasury stock, 470,188 shares at cost....................    (4,350)       (4,550)       (4,550)
  Accumulated other comprehensive loss......................    (1,100)       (1,421)       (1,182)
                                                               -------      --------      --------
         Total stockholders' equity.........................     5,419        24,190        24,338
                                                               -------      --------      --------
Commitments and contingencies
         Total liabilities and stockholders' equity.........   $95,413      $118,412      $105,468
                                                               =======      ========      ========
</TABLE>


          See accompanying notes to consolidated financial statements.
                                       F-3
<PAGE>   78

                       NATCO GROUP INC. AND SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF OPERATIONS

                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)



<TABLE>
<CAPTION>
                                                                   FOR THE
                                          FOR THE YEAR ENDED     NINE MONTHS    FOR THE SIX MONTHS
                                               MARCH 31,            ENDED         ENDED JUNE 30,
                                          -------------------   DECEMBER 31,    ------------------
                                            1997       1998         1998          1998      1999
                                                                                   (UNAUDITED)
<S>                                       <C>        <C>        <C>             <C>        <C>
Revenues................................  $126,657   $202,023     $145,611      $106,658   $86,175
Cost of goods sold......................   100,803    161,801      115,521        85,635    65,821
                                          --------   --------     --------      --------   -------
  Gross profit..........................    25,854     40,222       30,090        21,023    20,354
Selling, general and administrative
  expense...............................    23,313     28,553       24,530        15,274    15,321
Depreciation and amortization expense...       862      1,322        1,473           795     2,311
Interest expense........................     1,861      2,992        2,215         1,347     1,673
Interest cost on postretirement benefit
  liability.............................       957      1,048          786           524       523
Revaluation loss on postretirement
  benefit liability.....................     1,466        159           53            --        --
Interest income.........................      (116)      (140)        (227)         (101)      (99)
                                          --------   --------     --------      --------   -------
  Income (loss) from continuing
     operations before income taxes.....    (2,489)     6,288        1,260         3,184       625
Income tax provision (benefit)..........      (659)     1,141          608           594       479
                                          --------   --------     --------      --------   -------
  Income (loss) from continuing
     operations.........................    (1,830)     5,147          652         2,590       146
Gain on disposal of PTH division (net of
  applicable income taxes of $3,807)....  $  4,788         --           --            --        --
Income from discontinued operations (net
  of applicable income tax expense
  (benefit) of $(825) and $395,
  respectively).........................     1,100        767           --            --        --
                                          --------   --------     --------      --------   -------
  Net income............................  $  4,058   $  5,914     $    652      $  2,590   $   146
                                          ========   ========     ========      ========   =======
Basic earnings per share:
  Continuing operations.................  $  (0.31)  $   0.68     $   0.08      $   0.32   $  0.02
  Discontinued operations...............      0.98       0.10           --            --        --
                                          --------   --------     --------      --------   -------
  Net income............................      0.67       0.78         0.08      $   0.32      0.02
                                          ========   ========     ========      ========   =======
Diluted earnings per share:
  Continuing operations.................     (0.28)      0.64         0.07      $   0.29      0.01
  Discontinued operations...............      0.92       0.09           --            --        --
                                          --------   --------     --------      --------   -------
  Net income............................      0.64       0.73         0.07      $   0.29      0.01
                                          ========   ========     ========      ========   =======
Basic weighted average number of shares
  of common stock outstanding...........     6,032      7,623        8,243         8,146     9,151
Diluted weighted average number of
  shares of common stock outstanding....     6,371      8,067        8,942         8,876     9,824
</TABLE>


          See accompanying notes to consolidated financial statements.
                                       F-4
<PAGE>   79

                       NATCO GROUP INC. AND SUBSIDIARIES


    CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME

                             (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                          COMMON
                                         COMMON            STOCK                                            ACCUMULATED
                                         SHARES            CLASS     ADDITIONAL                                OTHER
                                   -------------------   ---------    PAID-IN     ACCUMULATED   TREASURY   COMPREHENSIVE
                                       A          B       A     B     CAPITAL       DEFICIT      STOCK         LOSS
<S>                                <C>         <C>       <C>   <C>   <C>          <C>           <C>        <C>
Balances at March 31, 1996.......  4,553,334        --   $ 1    --    $11,142      $(14,673)    $(4,350)      $  (563)
Purchase of warrant..............         --        --    --    --     (2,889)         (211)         --            --
Stockholder note repayment.......         --        --    --    --         --            --          --            --
Employee stock compensation......         --        --    --    --      1,241            --          --            --
Change of equity of minority
  interest.......................         --        --    --    --        129            --          --            --
Comprehensive income Net income..         --        --    --    --         --         4,058          --            --
  Foreign currency translation
    adjustment...................         --        --    --    --         --            --          --          (201)
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Total comprehensive income.......         --        --    --    --         --            --          --            --
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Balances at March 31, 1997.......  4,553,334        --   $ 1    --    $ 9,623      $(10,826)    $(4,350)      $  (764)
Issue common stock...............  2,113,334        --    16    --     10,624            --          --            --
Stock split......................         --        --    50    --        (50)           --          --            --
Change in equity of minority
  interest.......................         --        --    --    --        (11)           --          --            --
Dividends paid...................         --        --    --    --         --        (4,558)         --            --
Comprehensive income Net income..         --        --    --    --         --         5,914          --            --
  Foreign currency translation
    adjustment...................         --        --    --    --         --            --          --          (336)
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Total comprehensive income.......         --        --    --    --         --            --          --            --
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Employee stock compensation......         --        --    --    --         86            --          --            --
Note repayment...................         --        --    --    --         --            --          --            --
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Balances at March 31, 1998.......  6,666,668        --   $67    --    $20,272      $ (9,470)    $(4,350)      $(1,100)
Conversion of subordinated
  debt...........................  1,479,258        --    14    --      8,172            --          --            --
Issue common stock for
  acquisition....................         --   500,000    --     5      5,245            --          --            --
Issue common stock...............    504,762        --     5    --      5,295            --          --            --
Employee stock compensation......         --        --    --    --         23            --          --            --
Stock options repurchased........         --        --    --    --       (119)           --          --            --
Call option on common stock......         --        --    --    --         --            --        (200)           --
Comprehensive income
  Net income.....................         --        --    --    --         --           652          --            --
  Foreign currency translation
    adjustment...................         --        --    --    --         --            --          --          (321)
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Total comprehensive income.......         --        --    --    --         --            --          --            --
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Balances at December 31, 1998....  8,650,688   500,000   $86   $ 5    $38,888      $ (8,818)    $(4,550)      $(1,421)
Employee stock compensation
  (unaudited)....................         --        --    --    --         --            --          --            --
Stock options repurchased
  (unaudited)....................         --        --    --    --       (237)           --          --            --
Comprehensive income
  Net income (unaudited).........         --        --    --    --         --           146          --            --
  Foreign currency translation
    adjustment (unaudited).......         --        --    --    --         --            --          --           239
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Total comprehensive income
  (unaudited)....................         --        --    --    --         --            --          --            --
                                   ---------   -------   ---   ---    -------      --------     -------       -------
Balances at June 30, 1999
  (unaudited)....................  8,650,688   500,000   $86   $ 5    $38,651      $ (8,672)    $(4,550)      $(1,182)
                                   =========   =======   ===   ===    =======      ========     =======       =======

<CAPTION>

                                      NOTES
                                    RECEIVABLE         TOTAL
                                       FROM        STOCKHOLDERS'
                                   STOCKHOLDERS   EQUITY (DEFICIT)
<S>                                <C>            <C>
Balances at March 31, 1996.......     $(425)          $(8,868)
Purchase of warrant..............        --            (3,100)
Stockholder note repayment.......         4                 4
Employee stock compensation......        --             1,241
Change of equity of minority
  interest.......................        --               129
Comprehensive income Net income..        --             4,058
  Foreign currency translation
    adjustment...................        --              (201)
                                      -----           -------
Total comprehensive income.......        --             3,857
                                      -----           -------
Balances at March 31, 1997.......     $(421)          $(6,737)
Issue common stock...............        --            10,640
Stock split......................        --                --
Change in equity of minority
  interest.......................        --               (11)
Dividends paid...................        --            (4,558)
Comprehensive income Net income..        --             5,914
  Foreign currency translation
    adjustment...................        --              (336)
                                      -----           -------
Total comprehensive income.......        --             5,578
                                      -----           -------
Employee stock compensation......        --                86
Note repayment...................       421               421
                                      -----           -------
Balances at March 31, 1998.......        --           $ 5,419
Conversion of subordinated
  debt...........................        --             8,186
Issue common stock for
  acquisition....................        --             5,250
Issue common stock...............        --             5,300
Employee stock compensation......        --                23
Stock options repurchased........        --              (119)
Call option on common stock......        --              (200)
Comprehensive income
  Net income.....................        --               652
  Foreign currency translation
    adjustment...................        --              (321)
                                      -----           -------
Total comprehensive income.......        --               331
                                      -----           -------
Balances at December 31, 1998....        --           $24,190
Employee stock compensation
  (unaudited)....................        --                --
Stock options repurchased
  (unaudited)....................        --              (237)
Comprehensive income
  Net income (unaudited).........        --               146
  Foreign currency translation
    adjustment (unaudited).......        --               239
                                      -----           -------
Total comprehensive income
  (unaudited)....................        --               385
                                      -----           -------
Balances at June 30, 1999
  (unaudited)....................        --           $24,338
                                      =====           =======
</TABLE>


          See accompanying notes to consolidated financial statements.

                                       F-5
<PAGE>   80

                       NATCO GROUP INC. AND SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (DOLLARS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                                                     FOR THE
                                                                                       NINE          FOR THE SIX
                                                                FOR YEAR ENDED        MONTHS           MONTHS
                                                                  MARCH 31,           ENDED        ENDED JUNE 30,
                                                              ------------------   DECEMBER 31,   -----------------
                                                               1997       1998         1998        1998      1999
                                                                                                     (UNAUDITED)
<S>                                                           <C>       <C>        <C>            <C>       <C>
Cash flows from operating activities:
  Net income................................................  $ 4,058   $  5,914     $    652     $ 2,590       146
  Adjustments to reconcile net income to net cash provided
    by (used in) operating activities:
    Change in equity of minority interest...................      129        (11)          --          --        --
    Deferred income tax provision...........................     (408)      (565)         (16)        306       410
    Depreciation and amortization expense...................      862      1,322        1,473         795     2,311
    Noncash interest expense................................      925      1,031           --         290        76
    Interest cost on postretirement benefit liability.......      957      1,048          786         524       523
    Gain on sale of property, plant and equipment...........     (285)      (397)         (49)         --         1
    Loss on revaluation of postretirement benefit
      liability.............................................    1,466        159           53          --        --
    Noncash compensation expense............................    1,241         86           23          86      (237)
    Write off of accrued IPO fees...........................       --         --          380          --        --
    Other, net..............................................      107        242          (37)         80        --
    Change in assets and liabilities:
      (Increase) decrease in restricted cash................       45       (141)        (334)         --       883
      (Increase) decrease in trade accounts receivable......   (9,297)       347        2,853        (544)    7,377
      (Increase) decrease in inventories....................   (3,433)    (3,172)         570      (1,064)    3,263
      (Increase) decrease in prepaid expense and other
        current assets......................................      (13)      (361)         874       1,031      (281)
      Decrease in net assets of discontinued operations.....     (537)       349           --          --        --
      Increase (decrease) in other current liabilities,
        net.................................................    1,861       (243)      (1,642)     (1,768)     (616)
      Increase (decrease) in accounts payable...............    3,425     (3,765)      (5,834)      2,009    (6,044)
      Increase (decrease) in accrued expenses and other.....     (246)       757       (1,894)     (2,949)   (2,536)
      Increase (decrease) in customer advances and other....      202        513          692       1,183    (2,028)
                                                              -------   --------     --------               -------
        Net cash provided by (used in) operating
          activities........................................    1,059      3,113       (1,450)      2,569     3,248
                                                              -------   --------     --------               -------
Cash flows from investing activities:
  Capital expenditures for property, plant and equipment....   (1,159)    (1,256)      (1,636)       (609)   (1,574)
  Proceeds from sales of property, plant and equipment......      361      1,075           66          --        --
  Acquisitions, net of working capital acquired.............       --    (22,955)     (15,499)       (507)       --
  Increase in due from director.............................       --     (1,576)          --      (1,576)       --
                                                              -------   --------     --------               -------
        Net cash used in investing activities...............     (798)   (24,712)     (17,069)     (2,692)   (1,574)
                                                              -------   --------     --------               -------
Cash flows from financing activities:
  Net advances (repayments) under revolving credit
    agreements..............................................    6,843      8,867       (2,562)      2,316       344
  Change in bank overdrafts.................................     (823)     2,435         (156)        864       132
  Proceeds from notes receivable............................       --        421           --          --        --
  Proceeds from long-term debt..............................    2,500     10,000       39,477          --        --
  Proceeds from shareholder debt............................       --      2,360           --          --        --
  Repayments of long-term debt..............................   (5,947)   (11,529)     (20,631)     (1,193)   (3,056)
  Purchase of warrants......................................   (3,100)        --           --          --        --
  Issuance of common stock..................................       --     10,640        5,300          --        --
  Payments on postretirement benefit liability..............     (510)      (621)        (446)       (345)     (124)
  Other, principally bank and IPO fees......................        4       (913)        (803)     (1,053)      (93)
                                                              -------   --------     --------               -------
        Net cash provided by financing activities...........   (1,033)    21,660       20,179         589    (2,797)
                                                              -------   --------     --------               -------
Effect of exchange rate changes on cash and cash
  equivalents...............................................     (201)      (336)        (221)       (142)      171
                                                              -------   --------     --------               -------
Increase (decrease) in cash and cash equivalents............     (973)      (275)       1,439         324      (952)
Cash and cash equivalents at beginning of period............    2,189      1,216          941       1,447     2,380
                                                              -------   --------     --------               -------
Cash and cash equivalents at end of period..................  $ 1,216   $    941     $  2,380     $ 1,771   $ 1,428
                                                              =======   ========     ========               =======
Cash payments for:
  Interest..................................................  $ 2,973   $  2,101     $  2,045     $ 1,436   $ 1,668
  Income taxes..............................................  $   260   $  1,104     $  2,093     $   117   $   693
Significant non cash financing activities:
  Issuance of common stock for acquisition..................       --         --     $  5,250          --        --
  Conversion of subordinated debt...........................       --         --     $  8,172     $ 8,172        --
</TABLE>


          See accompanying notes to consolidated financial statements.
                                       F-6
<PAGE>   81

                       NATCO GROUP INC. AND SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

       (INFORMATION FOR THE SIX MONTHS ENDED JUNE 30, 1999 IS UNAUDITED)

                             (DOLLARS IN THOUSANDS)


(1) ORGANIZATION



     NATCO Group Inc. (the Company) was formed in June 1988 by Capricorn
Investors, L.P. (Capricorn). Capricorn led a group of investors who invested
sufficient funds in the Company to enable the Company to acquire several
businesses from Combustion Engineering, Inc. (C-E). On June 21, 1989, the
Company acquired from C-E all of the outstanding common stock of W. S. Tyler,
Incorporated (Tyler), and National Tank Company (NATCO), and the net assets of
certain foreign affiliates of the Company. The accompanying consolidated
financial statements and all related disclosures include the results of
operations of the Company and its majority-owned subsidiaries for the nine
months ended December 31, 1998 and the two years ended March 31, 1998.



     During 1992, the Company contributed its common stock investment in Tyler
and $5,500 in cash to Process Technology Holdings, Inc. (PTH) in exchange for
all of the issued and outstanding common stock of PTH. In 1992 and 1993, PTH and
the Company sold certain shares of PTH common stock to third parties and, during
1997, the Company completed a tax-free spin off of PTH to its stockholder. The
results of operations of PTH are shown as discontinued operations in the
consolidated statement of operations.



     On June 30, 1997, NATCO acquired Total Engineering Services Team, Inc.
(TEST), and on November 20, 1998, NATCO acquired The Cynara Company (CYNARA).


(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES


     Unaudited interim periods. The interim financial statements as of June 30,
1999 and for the six months ended June 30, 1999 and 1998 are unaudited. These
interim financial statements have been prepared on the same basis as the annual
financial statements included herewith. In the opinion of management, all
adjustments, consisting only of normal recurring adjustments, necessary to
fairly present the balance sheet, results of operations and cash flows with
respect to the interim financial statements, have been included. The results of
the operations for the interim periods are not necessarily indicative of the
results for the entire fiscal year.



     Fiscal Year Change. Effective April 1, 1998, the Company changed its fiscal
year end from March 31 to December 31.



     Principles of Consolidation. The consolidated financial statements include
the accounts of the Company and all of its majority-owned subsidiaries.
Significant intercompany accounts and transactions have been eliminated in
consolidation.



     Concentration of Credit Risk. Concentrations of credit risk with respect to
trade receivables are limited due to the large number of customers comprising
the Company's customer base and their geographic dispersion. The Company had
revenues from one customer that represented 14% of revenues for the year ended
March 31, 1998. There was no single company that had revenues in excess of 10%
of total revenues for the year ended March 31, 1997, the nine months ended
December 31, 1998 or the six months ended June 30, 1999.



     Cash Equivalents. The Company considers all highly-liquid investment
instruments with original maturities of three months or less to be cash
equivalents.



     Restricted Cash. At March 31, 1998, December 31, 1998, and June 30, 1999,
$549, $883, and $0, respectively, of cash was pledged as collateral on
outstanding letters of credit related to performance and warranty guarantees,
and was classified as restricted cash on the balance sheet.


                                       F-7
<PAGE>   82
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     Inventories. Inventories are stated at the lower of cost or market. Cost is
determined using the last in, first out (LIFO) method for NATCO domestic
inventories, average cost for TEST inventories and the first in, first out
(FIFO) method for all other inventories.



     Property, Plant and Equipment. Property, plant and equipment are stated at
cost less an allowance for depreciation. Depreciation on plant and equipment is
calculated using the straight-line method over the estimated useful lives.
Maintenance and repair costs are expensed as incurred; renewals and betterments
are capitalized. Upon the sale or retirement of properties, the accounts are
relieved of the cost and the related accumulated depreciation; and any resulting
profit or loss is included in income. The carrying values of property, plant and
equipment by location are reviewed annually and more often if there are
indications that these assets may be impaired.



     Goodwill. Goodwill is being amortized on a straight-line basis over periods
of 20 and 40 years. The Company assesses the recoverability of this intangible
asset by determining whether the amortization over its remaining life can be
recovered through undiscounted future operating cash flows. Based on its most
recent analysis, the Company believes that no material impairment of goodwill
exists at December 31, 1998. Amortization expense for the years ended March 31,
1997 and 1998, the nine months ended December 31, 1998, and the six months ended
June 30, 1999 was $13, $128, $167, and $503, respectively. Accumulated
amortization at March 31, 1998, December 31, 1998, and June 30, 1999 was $227,
$394, and $897, respectively.



     Other Assets, Net. Other assets consist of prepaid pension assets, deposits
of a long-term nature, and deferred financing costs. Deferred financing costs
relating to the Company's various loan agreements have been capitalized and are
being amortized over the term of the related debt agreements. Amortization
expense for the years ended March 31, 1997 and 1998, for the nine months ended
December 31, 1998, and the six months ended June 30, 1999 was $38, $262, $244,
and $155, respectively.



     Environmental Remediation Costs. The Company accrues environmental
remediation costs based on estimates of known environmental remediation
exposure. Such accruals are recorded when the cost of remediation is probable
and estimable, even if significant uncertainties exist over the ultimate cost of
the remediation. Ongoing environmental compliance costs, including maintenance
and monitoring costs, are expensed as incurred.



     Revenue Recognition. Revenues from significant contracts (NATCO contracts
greater than $250 and longer than four months in duration and all TEST contracts
and orders) are recognized on the percentage of completion method. Earned
revenue is based on the percentage that incurred costs to date bear to total
estimated costs after giving effect to the most recent estimates of total cost.
The cumulative impact of revisions in total cost estimates during the progress
of work is reflected in the year in which these changes become known. Earned
revenue reflects the original contract price adjusted for agreed claims and
change order revenues, if any. Losses expected to be incurred on jobs in
progress, after consideration of estimated minimum recoveries from claims and
change orders, are charged to income as soon as such losses are known. Customers
typically retain an interest in uncompleted projects. Other revenues and related
costs are recognized when products are shipped or services are rendered to the
customer.



     Stock-Based Compensation. Statement of Financial Accounting Standards
(SFAS) No. 123, "Accounting for Stock-Based Compensation," permits entities to
recognize as expense over the vesting period the fair value of all stock-based
awards on the date of grant. Alternatively, SFAS No. 123 also allows entities to
continue to apply the provisions of Accounting Principles Board (APB) Opinion
No. 25 and provide pro forma net income and pro forma earnings per share
disclosures for employee stock option grants made in 1995 and future years as if
the fair-value-based method defined in SFAS No. 123 had been applied. The
Company has elected to continue to apply the provision of APB Opinion No. 25 and
provide the pro forma disclosure provisions of SFAS No. 123.


                                       F-8
<PAGE>   83
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     Research and Development. Research and development costs are charged to
operations in the year incurred. The cost of equipment used in research and
development activities, which has alternative uses, is capitalized as equipment
and not treated as an expense of the period. Such equipment is depreciated over
estimated lives of 5 to 10 years. Research and development expenses totaled
$617, $738, $1,001, and $818 for the years ended March 31, 1997 and 1998, for
the nine months ended December 31, 1998, and the six months ended June 30, 1999,
respectively.



     Warranty Costs. Estimated future warranty obligations related to products
are charged to cost of goods sold in the period in which the related revenue is
recognized. Additionally, the Company provides some of its customers with
letters of credit covering potential warranty claims. At March 31, 1998,
December 31, 1998 , and June 30, 1999, the Company had $1,883, $2,528, and
$1,853, respectively, in outstanding letters of credit related to warranties.



     Income Taxes. Deferred tax assets and liabilities are recognized for future
tax consequences attributable to differences between the financial statement
carrying amounts of existing assets and liabilities and their respective tax
bases. Deferred tax assets and liabilities are measured using enacted tax rates
expected to apply to taxable income in the years in which those temporary
differences are expected to be recovered or settled. The effect on deferred tax
assets and liabilities of a change in tax rates is recognized in income in the
period that includes the enactment date.


     In assessing the realizability of deferred tax assets, management considers
whether it is more likely than not that some portion or all of the deferred tax
assets will not be realized. The ultimate realization of deferred tax assets is
dependent upon the future generation of taxable income during the periods in
which those temporary differences become deductible. Management has considered
the scheduled reversal of deferred tax liabilities, projected future taxable
income and tax planning strategies in making this assessment.


     Translation of Foreign Currencies. Financial statement amounts related to
foreign operations are translated into their United States dollar equivalents at
exchange rates as follows: (1) balance sheet accounts at year-end exchange rates
and (2) statement of operations accounts at the weighted average exchange rates
for the period. The gains or losses resulting from such translations are
deferred and included in accumulated other comprehensive income as a separate
component of stockholders' equity. Gains or losses from foreign currency
transactions are reflected in the consolidated statements of operations.



     Use of Estimates. Management of the Company has made a number of estimates
and assumptions relating to the reported amounts of assets and liabilities and
the disclosure of contingent assets and liabilities and the amounts of revenues
and expenses recognized during the period to prepare these financial statements
in conformity with generally accepted accounting principles. Actual results
could differ from those estimates.



     Earnings per Common Share. In February 1997, the Financial Accounting
Standards Board (FASB) issued SFAS No. 128, Earnings per Share, which replaced
primary and fully diluted earnings per share with basic and diluted earnings per
share. The Company adopted the provisions of SFAS No. 128 in the fourth quarter
of 1997 and all previously reported earnings per share data have been restated.
Under SFAS No. 128, the basic earnings per share calculation excludes the
dilutive effect of common stock equivalents in determining basic earnings per
share. The diluted earnings per common and common equivalent share are computed
by dividing net income by the weighted average number of common and common
equivalent shares outstanding. For the purposes of this calculation, outstanding
employee stock options are considered common stock equivalents. In conformity
with Securities and Exchange Commission requirements, common stock, options and
warrants, or other potentially dilutive instruments which have been issued for
nominal consideration during the periods covered by income statements presented
are reflected in earnings per share calculations for all periods presented.


                                       F-9
<PAGE>   84
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     The following table presents earnings per common share amounts computed
using SFAS 128:


<TABLE>
<CAPTION>
                                                              NET              PER SHARE
PERIOD ENDED                                                 INCOME   SHARES    AMOUNTS
<S>                                                          <C>      <C>      <C>
Year ended March 31, 1997
Basic EPS..................................................  $4,058   6,032     $ 0.67
Effect of dilutive securities:
Options....................................................      --     339      (0.03)
                                                             ------   -----     ------
Diluted EPS................................................  $4,058   6,371     $ 0.64
                                                             ======   =====     ======
Year ended March 31, 1998
Basic EPS..................................................  $5,914   7,623     $ 0.78
Effect of dilutive securities:
Options....................................................      --     444      (0.05)
                                                             ------   -----     ------
Diluted EPS................................................  $5,914   8,067     $ 0.73
                                                             ======   =====     ======
Nine months ended December 31, 1998
Basic EPS..................................................  $  652   8,243     $ 0.08
Effect of dilutive securities:
Options....................................................      --     699      (0.01)
                                                             ------   -----     ------
Diluted EPS................................................  $  652   8,942     $ 0.07
                                                             ======   =====     ======
Six months ended June 30, 1998
Basic EPS..................................................  $2,590   8,146     $ 0.32
Effect of dilutive securities:
Options....................................................      --     730      (0.03)
                                                             ------   -----     ------
Diluted EPS................................................  $2,590   8,876     $ 0.29
                                                             ======   =====     ======
Six months ended June 30, 1999
Basic EPS..................................................  $  146   9,151     $ 0.02
Effect of dilutive securities
Options....................................................      --     673      (0.01)
                                                             ------   -----     ------
Diluted EPS................................................  $  146   9,824     $ 0.01
                                                             ======   =====     ======
</TABLE>


(3) CAPITAL STOCK


     Common Stock. On June 25, 1997, the Board of Directors of the Company
approved an increase in the number of authorized common shares from 3,000 to
20,000,000. On that date, the directors declared a 7,503 for one common stock
split to be effected by the distribution of 7,502 additional shares for each
share of common stock held by stockholders of record as of that date. On March
6, 1998, the Company's charter was amended to increase the number of authorized
shares of capital shares from 20,000,000 to 55,000,000, of which 5,000,000 are
shares of preferred stock, par value $0.01, and 50,000,000 are shares of common
stock. On that date, the board of directors declared a common stock split to be
effected by the exchange of four shares for every three shares of common stock
outstanding. All share data has been restated to reflect the effects of this
transaction.



     On November 18, 1998, the Company's charter was again amended to divide the
common stock into two classes: Class A common stock (45,000,000 shares) and
Class B common stock (5,000,000 shares).


                                      F-10
<PAGE>   85
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


The two classes of common stock have the same relative rights and preferences
with the following exceptions:



     - The holders of the Class B common stock have the right, voting separately
       as a class, to elect one member of the Company's board of directors; and



     - unless the Company has previously effected an initial public offering of
       its Class A common stock, holders of Class B common stock will have:



      - the option, during the period from June 30, 2000 to December 31, 2001,
        to require the Company to purchase their Class B shares at a cash price
        of $13.00 per share; and



      - a liquidation preference over the Class A common stock equal to the
        amount then due with respect to any option previously exercised.



Class B shares may be converted by the holder to Class A shares at any time, and
will automatically convert to Class A shares on January 1, 2002.



(4) ACQUISITIONS



     On June 30, 1997, NATCO completed the acquisition of TEST from Weatherford
Enterra, Inc. for $22,475 in cash. The funds used for the acquisition of TEST
were provided by $10,640 in additional equity and a $2,360 loan from Capricorn
Investors II, L.P. (Capricorn II) and proceeds from a new senior credit
facility.



     The acquisition has been accounted for as a purchase and the results of
TEST have been included in the consolidated financial statements since the date
of the acquisition. The purchase agreement allowed for purchase price
adjustments and included a guarantee of collectibility for TEST accounts
receivable acquired at the purchase price date. The Company subsequently
received cash of $1,387 and $1,690 related to purchase price adjustments and the
reimbursement of uncollected accounts receivable of TEST, respectively, at the
end of the purchase price adjustment period. Goodwill amounted to $6,237 and is
being amortized over a forty-year period.



     On November 20, 1998, the Company completed the acquisition of Cynara from
a group of private investors for $5,250 in cash, the assumption of $10,118 in
Cynara bank debt, and the issuance of 500,000 shares of NATCO Class B common
stock valued at $5,250. In addition, the Company may be required to issue up to
an additional 1,400,000 shares to Cynara's former shareholders based on
performance criteria defined in the purchase agreement. The Company has placed
450,000 shares in escrow related to this provision. The Company estimates that
300,000 shares have been earned subsequent to June 30, 1999. Should additional
shares be issued, a corresponding increase will be made to cost in excess of
fair value of net assets acquired. The funds used for the acquisition of Cynara
were provided by $5,300 in additional equity and proceeds from a new senior
credit facility provided by a syndicate of major international banks. The
acquisition has been accounted for as a purchase and the results of Cynara have
been included in the consolidated financial statements since the date of
acquisition. Goodwill amounted to $10,841 and is being amortized over a
twenty-year period.


                                      F-11
<PAGE>   86
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     The unaudited pro forma results including Cynara for the nine months ended
December 31, 1998, below assume the acquisition occurred on April 1, 1998.



<TABLE>
<CAPTION>
                                                              NINE MONTHS ENDED
                                                                DECEMBER 31,
                                                                    1998
<S>                                                           <C>
Revenues....................................................      $149,481
Income from continuing operations...........................           236
Net income (loss)...........................................        (1,150)
Net income (loss) per share:
  Basic.....................................................      $  (0.14)
  Diluted...................................................      $  (0.13)
</TABLE>



     This pro forma data does not purport to be indicative of the actual results
that would have been achieved if these events actually occurred at the beginning
of the periods presented and is not intended to be a projection of future
results. The pro forma results include the amortization of goodwill ($444
annually). As part of their arrangement with their former parent company, Cynara
was charged an amount to offset parent company overhead for corporate
management, accounting, human resources, and legal services. NATCO corporate
overhead has not increased as a result of the acquisition of these companies.
Such amounts would be duplicative or redundant to the overhead already incurred
by NATCO, and accordingly $221 has been eliminated for Cynara for the nine
months ended December 31, 1998.


(5) INVENTORIES

     Inventories consisted of the following amounts:


<TABLE>
<CAPTION>
                                                       MARCH 31,   DECEMBER 31,   JUNE 30,
                                                         1998          1998         1999
<S>                                                    <C>         <C>            <C>
Finished goods.......................................   $ 4,487      $ 7,153      $ 6,127
Work-in-process......................................     5,810        5,642        4,856
Raw materials and supplies...........................    10,064        9,725        9,014
                                                        -------      -------      -------
  Inventories at FIFO................................    20,361       22,520       19,997
Excess of FIFO over LIFO cost........................      (265)        (266)        (266)
                                                        -------      -------      -------
                                                        $20,096      $22,254      $19,731
                                                        =======      =======      =======
</TABLE>



     At March 31, 1998, December 31, 1998 and June 30, 1999, inventories valued
using the LIFO method included in the above numbers amounted to $15,628, $15,855
and $15,129, respectively. During the years ended March 31, 1997 and 1998, the
nine months ended December 31, 1998, and the six months ended June 30, 1999
there were no reductions in the LIFO layers.


                                      F-12
<PAGE>   87
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

(6) COST AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS


     Cost and estimated earnings on uncompleted contracts are as follows:



<TABLE>
<CAPTION>
                                                       MARCH 31,   DECEMBER 31,   JUNE 30,
                                                         1998          1998         1999
<S>                                                    <C>         <C>            <C>
Cost incurred on uncompleted contracts...............   $54,396      $35,704      $42,564
Estimated earnings...................................    10,653       10,265       12,576
                                                        -------      -------      -------
                                                         65,049       45,969       55,140
Less billings to date................................    54,427       36,116       46,552
                                                        -------      -------      -------
                                                        $10,622      $ 9,853      $ 8,588
                                                        =======      =======      =======
Included in accompanying balance sheets under the
  following captions:
  Trade accounts receivable..........................   $11,596      $ 9,904      $ 8,588
  Customer advances..................................      (974)         (51)          --
                                                        -------      -------      -------
                                                        $10,622      $ 9,853      $ 8,588
                                                        =======      =======      =======
</TABLE>


(7) PROPERTY, PLANT AND EQUIPMENT, NET

     The components of property, plant and equipment, were as follows:


<TABLE>
<CAPTION>
                                       ESTIMATED USEFUL   MARCH 31,   DECEMBER 31,   JUNE 30,
                                        LIVES (YEARS)       1998          1998         1999
<S>                                    <C>                <C>         <C>            <C>
Land and improvements................            --        $ 1,232      $ 1,395         1,408
Buildings and improvements...........      20 to 40          7,093        7,441         7,638
Machinery and equipment..............       3 to 12          6,910       15,956        17,412
Office furniture and equipment.......       3 to 12          3,023        3,490         3,490
Less accumulated depreciation........                       (8,926)      (9,988)      (11,828)
                                                           -------      -------      --------
                                                           $ 9,332      $18,294      $ 18,120
                                                           =======      =======      ========
</TABLE>



     Depreciation expense was $811, $1,168, $1,291, and $1,815, respectively,
for the years ended March 31, 1997 and 1998, for the nine months ended December
31, 1998, and for the six months ended June 30, 1999. The Company leases certain
pieces of machinery and equipment to its customers, generally for periods of one
month to one year. The cost of leased machinery and equipment is $2,332, $2,351,
and $2,371 and the related accumulated depreciation is $1,785, $1,863, and
$1,942 at March 31, 1998, December 31, 1998 and June 30, 1999, respectively.
Lease and rental income of $688, $648, $468, and $206 for the years ended March
31, 1997 and 1998, the nine months ended December 31, 1998, and the six months
ended June 30, 1999, respectively, are included in revenues.


(8) OTHER ASSETS, NET

     Other assets consisted of the following:


<TABLE>
<CAPTION>
                                                       MARCH 31,   DECEMBER 31,   JUNE 30,
                                                         1998          1998         1999
<S>                                                    <C>         <C>            <C>
Deferred financing costs.............................   $  407        $  760          698
Deferred costs of public offering....................      380            --           --
Prepaid pension asset................................      283           246          246
Other assets.........................................       81            86           86
                                                        ------        ------       ------
                                                        $1,151        $1,092       $1,030
                                                        ======        ======       ======
</TABLE>


                                      F-13
<PAGE>   88
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     Deferred financing costs are amortized over the life of the related debt
instruments (three and five years). Accumulated amortization amounted to $132,
$129, and $158 at March 31, 1998, December 31, 1998, and June 30, 1999,
respectively.



(9) ACCRUED EXPENSES AND OTHER



     Accrued expense and other consisted of the following:



<TABLE>
<CAPTION>
                                                       MARCH 31,   DECEMBER 31,   JUNE 30,
                                                         1998          1998         1999
<S>                                                    <C>         <C>            <C>
Accrued compensation and benefits....................   $ 7,700      $ 8,802      $ 7,292
Accrued insurance reserves...........................     2,148          905          949
Warranty and product reserves........................     1,685        1,715        1,102
Taxes................................................       684          527          682
Other................................................     1,356        1,809          800
                                                        -------      -------      -------
          Totals.....................................   $13,573      $13,758      $10,825
                                                        =======      =======      =======
</TABLE>



     During the year ended March 31, 1998 and the nine months ended December 31,
1998, the Company revised its previous estimate of accrued insurance reserves
resulting in a reduction of insurance expense of $1,326 and $1,207,
respectively.


(10) SHORT-TERM DEBT


     At March 31, 1998 and December 31, 1998, NATCO had a $5,000 working capital
facility for export sales. The loans bear interest at prime, which was 8.5% and
7.75% at March 31, 1998 and December 31, 1998, respectively. Borrowings are
based on the value of inventory and accounts receivable. The bank facility is
secured by specific project inventory and receivables, a 90% guarantee from EXIM
bank, and a second lien on the assets pledged to the NATCO revolving credit bank
loan. The working capital facilities and loans are annual programs. The facility
in place during the year ended March 31, 1998, matured on June 30, 1998 and was
extended to August 31, 1998. The facility in place at December 31, 1998 will
mature on August 31, 1999. At March 31, 1998 and December 31, 1998, $17, and
$1,585, respectively, had been drawn against these facilities. The Company had
letters of credit outstanding under this facility totaling $1,270 and $523 at
March 31, 1998 and December 31, 1998, respectively. Subsequent to December 31,
1998, the working capital facility was increased to $10,000.



     At March 31, 1998, NATCO-Canada had $4,130 outstanding under a revolving
credit agreement that was due on demand and bears interest at prime plus 0.5%
per annum (7.0% at March 31, 1998). As of March 31, 1998, the maximum
availability under the agreement was $4,931 ($7,000 Canadian). Availability is
based on the collateral value of accounts receivable and inventory, as defined
in the agreement. The loan is secured by collateral mortgages on the
subsidiary's property and plant, a general security agreement over all
equipment, and a general assignment of accounts receivable. The loan contains
various restrictive covenants which include, among others, restrictions on
capital asset additions, incurrences of additional debt, the requirement to
maintain certain financial ratios and restrictions on the aggregate of capital
expenditures and dividends paid in any one fiscal year not to exceed 50% of net
cash flow, which is defined as the sum of after-tax net profit plus depreciation
and amortization and taxes less payments made on long-term debt. In connection
with the refinancing of the Company's bank debt described in note 11,
NATCO-Canada paid this loan off in full prior to December 31, 1998.


                                      F-14
<PAGE>   89
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

(11) LONG-TERM DEBT

     The consolidated borrowings of the Company are as follows:


<TABLE>
<CAPTION>
                                                       MARCH 31,   DECEMBER 31,   JUNE 30,
                                                         1998          1998         1999
<S>                                                    <C>         <C>            <C>
RELATED PARTIES
13% subordinated notes, with interest and principal
  payable at maturity, due June 30, 2000.............   $ 8,226      $    --      $    --
BANK DEBT
Term loan with variable interest rate (7.68% at
  December, 31, 1998) quarterly payments of principal
  ($1,161) and interest, due November 30, 2003.......        --       32,500       30,179
Revolving credit bank loans with variable interest
  rate (8.04% at December 31, 1998) quarterly payment
  of interest, due November 30, 2001.................        --        6,977        6,242
Term loan with variable interest rate (8.69% at March
  31, 1998) quarterly payments of principal ($357)
  and interest, due November 30, 2002................     8,929           --           --
Revolving credit bank loan with variable interest
  rate (8.73% at March 31, 1998) quarterly payment of
  interest, due June 30, 2000........................    10,580           --           --
Industrial revenue bond, $50 due annually with
  balance due September 1, 2005......................       765          715          715
Mortgage, with interest at prime plus 1%, (7.5% at
  March 31, 1998) quarterly payments of principal
  ($33) and interest through May 2000................       936           --           --
Term loan with interest at prime plus 1% (7.5% at
  March 31, 1998) monthly payments of principal ($6)
  and interest through February 2000.................       136           --           --
                                                        -------      -------      -------
          Total......................................    29,572       40,192       37,136
          Less current installments..................    (1,682)      (4,693)      (4,693)
                                                        -------      -------      -------
          Long-term debt.............................   $27,890      $35,499      $32,443
                                                        =======      =======      =======
</TABLE>



     The aggregate annual future maturities of long-term debt for the next five
years ended December 31 are as follows: 1999 -- $4,693, 2000 -- $4,693,
2001 -- $11,670, 2002 -- $4,693, 2003 -- $13,987, thereafter $456.



     Parent Company. On December 11, 1991, the Company issued its promissory
notes to Capricorn to evidence borrowings of $5,000,000. The notes were
subordinated to all senior debt of the Company. Thereafter, interest payments
were deferred and added to the principal amount of the notes. During the period
prior to June 1997, the maturity dates of these notes were extended to 2000 and
$4,600 thereof was assumed, with the consent of Capricorn, by PTH in connection
with the distribution by the Company of the capital stock of PTH to Capricorn.
In conjunction with the refinancing of its domestic debt facility, the remaining
notes plus accrued but unpaid interest held by Capricorn were exchanged for
$5,100 in principal amount of the Company's 13% Subordinated Promissory Note due
2000 (the "Cap I Note").



     In June 1997, the Company completed the refinancing of its domestic debt
facility, in part to finance the acquisition of TEST. At that time, Capricorn II
invested an aggregate of $13,000 in the Company and received in exchange
2,113,334 shares of Common Stock and $2,400 in principal amount of the


                                      F-15
<PAGE>   90
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


Company's 13% Subordinated Promissory Note due 2000 (the "Cap II Note"), the
terms of which are, except for the principal amount, identical to the Cap I
Note. The 13% subordinated notes are convertible into 1,479,258 shares of
Company common stock. Effective April 1, 1998, the Cap I and Cap II Notes were
converted into common stock of the Company.



     NATCO. On November 20, 1998, new revolving credit and term loan facilities
were put into place with a syndicate of major international banks. The new
credit facilities provide for a $32,000 revolving credit line ($22,000 available
in the U.S., $10,000 available in Canada) to finance eligible accounts
receivable and inventories, and a $32,500 term loan. Indebtedness under the
credit facilities bears interest at a floating rate based (at the Company's
option) upon (i) the Base Rate, or Canadian prime rate with respect to Base Rate
Loans, plus the Margin Percentage or (ii) the London Interbank Offered Rate for
one, two, three or six months, plus the Margin Percentage. The Margin Percentage
for Base Rate and Canadian prime rate loans varies from 1.00% to 0.00% depending
on the Company's debt to capitalization ratio; and the Margin Percentage for
Eurodollar loans varies from 2.50% to 1.00% depending on the Company's debt to
capitalization ratio. The term borrowings mature on November 30, 2003, and the
revolving borrowings mature on November 30, 2001. These agreements contain
affirmative covenants including financial requirements related to minimum net
worth, debt to capitalization ratio, and fixed charge coverage ratio, as well as
restrictions on NATCO making any distributions of any property or cash to the
Company in excess of an agreed sum without prior lender approval, and requires
commitment fees in accordance with standard banking practices. The loan is
collateralized by substantially all assets of the Company and its subsidiaries
as well as a guarantee of the Company. As of December 31, 1998, the Company was
in compliance with all restrictive covenants. NATCO had letters of credit
outstanding under the revolving credit facilities totaling $2,592 at December
31, 1998. These letters of credit constitute contract performance and warranty
collateral and expire at various dates through September 2002.



     At March 31, 1998 and until November 20, 1998, NATCO and the Company
participated in a revolving credit agreement, which was collateralized by all of
the assets of the Company and NATCO, and was guaranteed by the Company. The
agreement provided for maximum revolver borrowings of $18,000 and an additional
term loan of $10,000. At March 31, 1998, the interest rate on the revolving
credit facility was 8.73%. The interest rate on the term loan was 7.5% (prime
plus 1%), and interest was payable quarterly along with quarterly principal
payments of $357. The revolving credit agreement contained various restrictive
covenants, which included, among others, restrictions on capital asset
additions, incurrence of additional debt and the requirements to maintain
certain financial ratios. The maturity date of the revolver loan was June 30,
2000, and the term loan was due June 30, 2002. NATCO had letters of credit
outstanding under the revolving credit facility totaling $2,101 at March 31,
1998. These letters of credit constitute contract performance and warranty
collateral and expire at various dates through August 1999.



     The industrial revenue bond is secured by plant, real property, and
equipment of NATCO and is also guaranteed by NATCO. Interest ranges from 7.9% to
8.5%, payable semiannually. The net book value of the related property was $408
at December 31, 1998.



     NATCO-Canada borrowed $1,283 and $61 under a bankers' acceptance and
mortgage, respectively, to finance the purchase of land and buildings from
Tyler. This was done to simplify the corporate structure, reduce borrowing costs
and foreign exchange risk, and enhance the overall corporate tax position. The
bankers' acceptance matured on May 18, 1995, and was paid with the proceeds of
an additional borrowing on the mortgage of the land and buildings in the amount
of $1,283. The bankers' acceptance, mortgage and term loan are secured by
collateral mortgages on a NATCO subsidiary's property and plant, a general
security agreement over all equipment, and a general assignment of accounts
receivable. The bank loan, mortgage and term loan contain various restrictive
covenants which include, among others, restrictions on


                                      F-16
<PAGE>   91
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


capital asset additions and incurrence of additional debt, and the requirements
to maintain certain financial ratios. As part of the Company's debt refinancing
in 1998, these notes were paid off.



     Dividend Restrictions. With respect to its new credit facilities, NATCO has
agreed that it will not make any distributions of any property or cash to the
Company or its stockholders' in excess of $1,500 for 1998, $2,000 for 1999, and
$2,200 for any year thereafter, plus 50% of excess cash flow beginning in 2001.



     The Company's previous Canadian loan facility contained various restrictive
covenants which included, but were not limited to, restrictions on the aggregate
of capital expenditures and/or dividends paid in any one fiscal year not to
exceed 50% of net cash flow, defined as the sum of after tax net profit plus
depreciation/amortization and deferred taxes less payments made on long term
debt. For the fiscal year ended March 31, 1998, NATCO-Canada was restricted from
making any such payments in excess of $1,699.


(12) INCOME TAXES


     Income tax expense (benefit) consisted of the following components:



<TABLE>
<CAPTION>
                                                            YEAR ENDED     NINE MONTHS
                                                            MARCH 31,         ENDED
                                                          --------------   DECEMBER 31,
                                                          1997     1998        1998
<S>                                                       <C>     <C>      <C>
Current:
  Federal...............................................  $(711)  $ (319)     $  --
  State.................................................     --       --        129
  Foreign...............................................    460    2,025        495
                                                          -----   ------      -----
                                                           (251)   1,706        624
                                                          -----   ------      -----
Deferred:
  Federal...............................................   (323)    (511)        77
  State.................................................    (85)     (54)        36
  Foreign...............................................     --       --       (129)
                                                          -----   ------      -----
                                                           (408)    (565)       (16)
                                                          -----   ------      -----
                                                          $(659)  $1,141      $ 608
                                                          =====   ======      =====
</TABLE>


                                      F-17
<PAGE>   92
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Temporary differences related to the following items that give rise to
deferred tax assets and liabilities are as follows:


<TABLE>
<CAPTION>
                                                              MARCH 31,   DECEMBER 31,
                                                                1998          1998
<S>                                                           <C>         <C>
Deferred tax assets:
  Postretirement benefit liability..........................   $ 5,774      $ 5,923
  Accrued liabilities.......................................     3,420        3,017
  Net operating loss carryforward...........................       493        1,113
  Accounts receivable.......................................       334          192
  Property, plant and equipment.............................        40           --
                                                               -------      -------
          Total deferred tax assets.........................   $10,061      $10,245
                                                               -------      -------
Deferred tax liabilities:
  Inventory.................................................   $ 1,201      $   992
  Property, plant and equipment.............................        --           59
  Pension assets............................................       108           93
                                                               -------      -------
          Total deferred tax liabilities....................     1,309        1,144
                                                               -------      -------
          Net deferred tax assets...........................   $ 8,752      $ 9,101
                                                               =======      =======
</TABLE>



     At March 31, 1998 and December 31, 1998, the Company did not record a
valuation allowance related to its deferred tax assets because it is the opinion
of management that future operations will more likely than not generate
sufficient taxable income to realize the deferred tax assets. At December 31,
1998, the Company has net operating loss carryforwards for federal income tax
purposes of $3,172 which are available to offset future federal income tax, if
any, through 2018.



     Income tax expense (benefit) differs from the amount computed by applying
the U.S. federal income tax rate of 34% to income (loss) from continuing
operations before income taxes as a result of the following:



<TABLE>
<CAPTION>
                                                                               NINE MONTHS
                                                       YEAR ENDED MARCH 31,       ENDED
                                                       ---------------------   DECEMBER 31,
                                                        1997         1998          1998
<S>                                                    <C>         <C>         <C>
Income tax expense (benefit) computed at statutory
  rate...............................................   $(846)      $ 2,138        $428
State income tax expense (benefit) net of federal
  income tax effect..................................     (85)          (54)         87
Foreign income tax expense net of federal income tax
  effect.............................................      10           278          31
Foreign losses for which no tax benefit is currently
  available..........................................     530            31          49
Tax benefit of foreign losses not previously
  claimed............................................      --        (1,507)        (79)
Permanent differences, primarily meals and
  entertainment and amortization.....................      60           130         122
Other................................................    (328)          125         (30)
                                                        -----       -------        ----
                                                        $(659)      $ 1,141        $608
                                                        =====       =======        ====
</TABLE>



     A provision has not been made for U.S. income taxes that would be payable
if undistributed earnings of foreign subsidiaries were distributed to the
Company in the form of dividends, since it is management's intention to reinvest
such earnings permanently in the related foreign operations. At December 31,
1998, such amounts were not significant.


                                      F-18
<PAGE>   93
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     Federal income tax returns for fiscal years beginning with 1996 are open
for review by the Internal Revenue Service.


(13) STOCKHOLDERS' EQUITY


     CEO Stock Options. In connection with the engagement of Nathaniel A.
Gregory as the chief executive officer of the Company, the Company granted to
him options to purchase NATCO common stock that were subsequently converted to
options to purchase common stock of the Company. At March 31, 1997 and 1998 and
at December 31, 1998, these options related to an aggregate of 905,104 shares of
Company common stock.



     Stock Appreciation Rights. During 1994, NATCO adopted the National Tank
Company Stock Appreciation Rights Plan (the National Tank Plan). The National
Tank Plan provided for grants to officers and key employees of NATCO of rights
to the appreciation in value of a stated number of shares of NATCO common stock.
Value was to be determined by a committee of the NATCO board of directors. The
maximum number of rights issuable under the National Tank Plan was 500,000.
Rights vested over a three year period. At March 31, 1997, there were 390,005
rights outstanding, of which 290,080 were vested. Compensation expense has been
adjusted in connection with the plan for the years ended March 31, 1997 and 1998
and the nine months ended December 31, 1998 to reflect expense of $1,241, $86
and $23, respectively.



     Individual Stock Options. On July 1, 1997, the board of directors of the
Company approved the exchange of rights outstanding under the National Tank Plan
for individual options to purchase common stock of the Company. The exercise
price of these options was equal to fair market value of the common stock.
Accordingly, no compensation expense was recorded. The individual stock options
granted on July 1, 1997 vested ratably over a period of three or four years. The
maximum term of these options was 7.5 years. The Company reserved an aggregate
of 390,005 shares of common stock for issuance upon exercise of these individual
stock options.



     Stock Options Plans. In January 1998 and February 1998, the Company adopted
the Directors Compensation Plan and the Employee Stock Incentive Plan. These
plans authorize the issuance of options to purchase up to an aggregate of
760,000 shares of Company common stock. The options vest over periods of up to
four years. The maximum term under these options is ten years. At March 31, 1998
and December 31, 1998, options relating to an aggregate of 260,006 shares and
464,672 shares were outstanding under these plans.


                                      F-19
<PAGE>   94
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     The following table summarizes the transactions of the company's stock
option plans for the years ended March 31, 1997 and 1998, the nine months ended
December 31, 1998 and the six months ended June 30, 1999:



<TABLE>
<CAPTION>
                                                                                WEIGHTED
                                                            STOCK OPTIONS       AVERAGE
                                                               SHARES        EXERCISE PRICE
<S>                                                         <C>              <C>
Balance at March 31, 1996.................................      555,555          $ 1.47
  Granted.................................................      185,186          $ 3.58
  Exercised...............................................           --              --
  Canceled................................................           --              --
                                                              ---------          ------
Balance at March 31, 1997.................................      740,741          $ 1.85
  Granted.................................................      424,369          $ 5.15
  Exercised...............................................           --              --
  Canceled................................................           --              --
Conversion of Stock Appreciation Rights to Stock
  Options.................................................      390,005              --
                                                              ---------          ------
Balance at March 31, 1998.................................    1,555,115          $ 2.75
  Granted.................................................      262,751          $ 8.81
  Exercised...............................................      (38,333)         $ 8.81
  Canceled................................................      (19,752)         $ 6.71
                                                              ---------          ------
Balance at December 31, 1998..............................    1,759,781          $ 3.48
  Granted.................................................       72,500          $ 8.81
  Exercised...............................................      (68,334)         $ 1.56
  Canceled................................................      (13,667)         $ 7.43
                                                              ---------          ------
Balance at June 30, 1999..................................    1,750,280          $ 3.90
Price range $1.47 -- $2.22 (weighted average remaining
  contractual life of 3.62 years).........................      845,559          $ 1.51
Price range $3.58 -- $5.03 (weighted average remaining
  contractual life of 4.93 years).........................      569,553          $ 4.56
Price $8.81 (weighted average remaining contractual life
  of 8.99 years)..........................................      335,168          $ 8.81
</TABLE>



<TABLE>
<CAPTION>
                                                                                WEIGHTED
                                                             STOCK OPTIONS      AVERAGE
                                                                SHARES       EXERCISE PRICE
<S>                                                          <C>             <C>
Exercisable Options March 31, 1997.........................    1,030,745         $1.86
March 31, 1998.............................................    1,279,778         $2.26
December 31, 1998..........................................    1,379,638         $2.69
June 30, 1999..............................................    1,374,402         $2.87
</TABLE>



     Pro forma information regarding net income and earnings per share is
required by SFAS 123, and has been determined as if the Company had accounted
for its employee stock options under the minimum value method of this statement
under the assumptions of a risk free rate of 5.5% and an expected life of
options of 10 years for options issued during the year ended December 31, 1998.
For options issued prior to March 31, 1998, the risk free rate of return used
was 7% and the expected life used was 7.5 years.


                                      F-20
<PAGE>   95
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     For purposes of pro forma disclosures, the estimated fair value of the
options is amortized to expense over the options' vesting period. The Company's
pro forma net earnings and earnings per share for the years ending March 31,
1997 and 1998 and the nine months ending December 31, 1998 were as follows:



<TABLE>
<CAPTION>
                                                                         NINE MONTHS ENDED
                                                 YEAR ENDED MARCH 31,      DECEMBER 31,
                                                 --------------------    -----------------
                                                  1997         1998            1998
<S>                                              <C>          <C>        <C>
Net earnings -- as reported....................  $4,058       $5,914           $ 652
Net earnings -- pro forma......................  $4,007       $5,844           $ 495
Earnings per share -- as reported..............  $ 0.67       $ 0.78           $0.08
Earnings per share -- pro forma................  $ 0.66       $ 0.77           $0.06
</TABLE>


     Because the statement provides for pro forma amounts for options granted
beginning in 1995, the pro forma expense will likely increase in future years as
the new option grants become subject to the pricing model.


  Preferred Stock Purchase Rights



     In May 1998, the board of directors of the Company declared a dividend of
one preferred share purchase right (right) for each outstanding share of common
stock and for each share of common stock thereafter issued prior to the time the
rights become exercisable. When the rights become exercisable, each right will
entitle the holder to purchase one one-hundredth of one share of Series A Junior
Participating Preferred Stock at a price of $72.50 in cash. Until the rights
become exercisable, they will be evidenced by the certificates or ownership of
our common stock and they will not be transferable apart from the common stock.



     The rights will become exercisable following the tenth day after a person
or group announces acquisition of 15% or more of the Company's common stock or
announces commencement of a tender offer the consummation of which would result
in ownership by the person or group of 15% or more of the common stock. If a
person or group were to acquire 15% or more of the Company's common stock, each
right would become a right to buy that number of shares of common stock that
would have a market value of two times the exercise price of the right. Rights
beneficially owned by the acquiring person or group would, however, become void.



     At any time prior to the time the rights become exercisable, the board of
directors may redeem the rights at a price of $0.01 per right. At any time after
the acquisition by a person or group of 15% or more but less than 50% of the
common stock, the board may redeem all or part of the rights by issuing common
stock in exchange for them at the rate of one share of common stock for each two
shares of common stock for which each right is then exercisable. The rights will
expire on May 15, 2008 unless previously extended or redeemed.



(14) PENSION AND OTHER POSTRETIREMENT BENEFITS



     The Company has adopted SFAS 132, which revised disclosures about pension
and other postretirement benefit plans. Disclosures regarding pension benefits
represent the plan for certain union employees of a foreign subsidiary.
Disclosures regarding postretirement benefits represent health care and life
insurance benefits for employees who were retired at the time the Company was
acquired from C-E.


                                      F-21
<PAGE>   96
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


The following table sets forth the plan's benefit obligation, fair value of plan
assets, and funded status at March 31, 1998 and December 31, 1998.



<TABLE>
<CAPTION>
                                                    PENSION BENEFITS         POSTRETIREMENT BENEFITS
                                                ------------------------   ---------------------------
                                                MARCH 31,   DECEMBER 31,    MARCH 31,     DECEMBER 31,
                                                  1998          1998           1998           1998
<S>                                             <C>         <C>            <C>            <C>
CHANGE IN BENEFIT OBLIGATION
Benefit obligation at beginning of the
  period......................................    $385          $418         $ 14,608       $ 15,194
Service cost..................................      34            39               --             --
Interest cost.................................      31            33            1,048            786
Participant contributions.....................      --            --              142             83
Actuarial loss................................      14           106              159             53
Foreign currency exchange rate differences....     (15)          (34)              --             --
Contribution from former plan holder..........      --            --            1,047          1,104
Benefit payments..............................     (31)          (35)          (1,810)        (1,633)
                                                  ----          ----         --------       --------
Benefit obligation at end of period...........    $418          $527         $ 15,194       $ 15,587
                                                  ====          ====         ========       ========
CHANGE IN FAIR VALUE OF PLAN ASSETS
Fair value of plan assets at beginning of
  period......................................    $613          $647         $     --       $     --
Actual return on plan assets..................      88            54               --             --
Foreign currency exchange rate differences....     (23)          (49)              --             --
Employer contributions........................      --            --              621            446
Participant contributions.....................      --            --              142             83
Contribution from former plan holder..........      --            --            1,047          1,104
Benefit payments..............................     (31)          (35)          (1,810)        (1,633)
                                                  ----          ----         --------       --------
Fair value of plan assets at end of period....     647           617               --             --
                                                  ----          ----         --------       --------
Funded status.................................     229            90          (15,194)       (15,587)
Unrecognized loss.............................      54           156               --             --
                                                  ----          ----         --------       --------
Prepaid (accrued) benefit cost................    $283          $246         $(15,194)      $(15,587)
                                                  ====          ====         ========       ========
WEIGHTED AVERAGE ASSUMPTIONS
Discount rate.................................     8.5%          7.5%             7.0%          6.75%
Expected return on plan assets................     9.0%          7.5%             N/A            N/A
Rate of compensation increase.................     N/A           N/A              N/A            N/A
Health care trend rates.......................      --            --         4.5%-7.5%      4.5%-6.5%
COMPONENTS OF NET PERIODIC BENEFIT COST:
Service cost..................................    $ 34          $ 39         $     --       $     --
Interest cost.................................      31            33            1,048            786
Recognized gains..............................     (51)          (54)              --             --
                                                  ----          ----         --------       --------
Net periodic benefit cost.....................    $ 14          $ 18         $  1,048       $    786
                                                  ====          ====         ========       ========
                                                                            1% DECREASE   1% INCREASE
Effect on interest cost component.............                               $    (41)        $     85
Effect on the health care component of the
  accumulated postretirement benefit
  obligation..................................                               $   (611)        $  1,266
</TABLE>



     Deferred Compensation Plan. TEST adopted a deferred compensation plan (the
TEST Plan) effective July 1, 1995 to provide incentives and rewards to certain
individuals. Awards are payable in five equal annual installments plus any
earnings, which have been allocated to a participant's account. The Company has
elected not to make any additional awards for the plan year beginning January 1,
1998. As


                                      F-22
<PAGE>   97
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


of December 31, 1998, the total amount owed under the TEST Plan was $578. This
balance presently accrues interest at the prime rate plus 1%.



     Defined Contribution Plans. The Company and its subsidiaries each have
defined contribution pension plans covering substantially all nonunion hourly
and salaried employees who have completed three months of service. Employee
contributions of up to 4% of each covered employee's compensation are matched
100% by the Company. In addition, the Company may at its discretion, contribute
up to an additional 2% of such compensation as a profit sharing contribution.
Company contributions to the plan totaled $1,912 and $912 for the year ended
March 31, 1998 and the nine months ended December 31, 1998, respectively.


(15) OPERATING LEASES


     The Company and its subsidiaries lease various facilities and equipment
under noncancellable operating lease agreements. These leases expire on various
dates through 2003. Future minimum lease payments required under operating
leases that have remaining noncancellable lease terms in excess of one year at
December 31, 1998, are as follows: 1999 -- $2,901, 2000 -- $2,376,
2001 -- $1,405, 2002 -- $420, 2003 -- $48. Total expense for operating leases
for the years ended March 31, 1997 and 1998, for the nine months ended December
31, 1998, and the six months ended June 30, 1999 was $2,241, $2,563, $2,298, and
$1,621, respectively.



     Lease and rental income of $688, $648, $486, and $206 are included in
revenues for years ended March 31, 1997 and 1998, the nine months ending
December 31, 1998 and the six months ended June 30, 1999, respectively.


(16) RELATED PARTIES


     The Company agreed in 1989 to pay $350,000 per year plus specified
out-of-pocket expenses to Capricorn Management to perform management and other
services for the Company and PTH. At the time of the spin-off of PTH, the
agreement was modified to limit the services to administrative services and to
reduce the fee to $75,000 per year plus expenses. Fees paid to Capricorn
Management totaled $374, $163 and $56 for the years ended March 31, 1997 and
1998 and the nine months ended December 31, 1998, respectively.



     Employees of Capricorn Management have participated in various NATCO
employee benefit plans and the Company has from time to time been billed by
vendors for services provided to Capricorn Management personnel acting for the
benefit of the Company. Capricorn Management reimburses the Company for the
foregoing expenses. At December 31, 1998, Capricorn Management owed the Company
$16 for these expenses.



     For the year ended March 31, 1998 and the nine months ended December 31,
1998, PTH paid $95, and $49, respectively to the Company for tax consulting and
analysis services. The Company currently provides tax consulting and analysis
services to PTH for $7 per month.



     On November 1, 1989, two former officers purchased 420,168 shares of common
stock from the Company for $285 in cash and personal notes of $419. The interest
rates on the notes were based on the three-month commercial paper rate until the
officers left the Company and entered into option agreements (see below), at
which time the interest rate became 18%. Interest is payable annually in arrears
and the notes were due November 15, 1996. Accrued interest receivable of $2 is
included with the notes receivable balance at March 31, 1997. During the fiscal
year ended March 31, 1998 both notes were paid in full.



     Effective December 31, 1994, Capricorn entered into an option agreement
with a former officer and 2.5% stockholder of the Company (see above). The
option, which enabled the stockholder to exchange


                                      F-23
<PAGE>   98
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

common stock for a specified interest in a note from the Company, was exercised
on May 10, 1995 for an 18% subordinated note for $1,330 (see note 11). Also,
during fiscal year 1997, Capricorn purchased $1,079 of the note from the note
holder. During the fiscal year ended March 31, 1998, Capricorn purchased the
remaining portion of the note.


     During 1997, the Company loaned the amount of $1,525 to a director of the
Company who is also an affiliate of Capricorn. The promissory note given by the
director bears interest until maturity at 11% per annum. The principal is due on
the date on which Capricorn has distributed its holding of Company common stock
to its partners. During 1998, the Company acquired an option at a cost of $200
to purchase 173,050 shares of Company common stock from the director at a price
of $8.81 per share. At the Company's option, the note may be repaid with shares
of the common stock of the Company. The cost to acquire the option has been
recorded as treasury stock in the accompanying consolidated balance sheet.



     An executive officer of the Company has an employment agreement pursuant to
which he was entitled to a bonus upon the occurrence of any sale or public
offering of the Company. Such bonus was to equal one and one-half percent (1.5%)
of the value of all securities owned by stockholders of the Company prior to the
sale or offering, including Common Stock valued at the price per share received
in either the sale or public offering, and any debt held by such stockholders.



     In July 1999, we amended the agreement to eliminate the bonus. Instead the
Company agreed to lend the officer $1,205 to purchase 136,832 shares of common
stock. The loan accrues interest at 6% annually. The officer will receive a
bonus equal to the outstanding principal and interest of the note upon the sale
or public offering of the Company.


(17) DISCONTINUED OPERATIONS -- PTH


     PTH manufactures vibrating screens, rock crushing equipment, conveyor
components and screening media with operations in the United States, Canada, and
Scotland. On June 30, 1997 the Company completed the tax-free spin-off of PTH by
distributing the 14,250 shares of PTH stock that it owned to Capricorn I as the
holder of its common stock. Capricorn I was the sole stockholder of the Company
at the time of distribution, and accordingly this transaction was recorded on a
historical cost basis. The spin-off distribution reduced stockholders' equity by
$4,558 that represents the net assets of PTH at the date of spin-off including
the assumption of $4,576 of debt owed by the Company to Capricorn and the
forgiveness of $2,347 of intercompany balances.



     The historical results for discontinued operations include an allocation of
the Company's nonspecific interest expense based on the ratio of net assets for
PTH divided by the sum of net assets of the Company, plus all the Company's
debt. Debt and interest expense directly incurred by NATCO was excluded from the
ratio. Interest expense for the Company attributable to the PTH operations and
included in the profit and loss from discontinued operations for the year ending
March 31, 1998, up to and including the disposal date of June 30, 1997; this
amount was $285.



     At the time of the spin-off, the Company and PTH entered into a tax sharing
agreement with provisions for determining responsibility for tax liabilities of
PTH for the years that PTH was included in the Company's consolidated tax
returns. Income taxes have been allocated to PTH based on its pretax income and
calculated on a separate company basis pursuant to the requirements of SFAS No.
109, Accounting for Income Taxes. Income tax allocated to PTH for the year ended
March 31, 1997 and 1998 were $2,982 and $395, respectively.


                                      F-24
<PAGE>   99
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     Summarized financial data for the discontinued operations are as follows:



<TABLE>
<CAPTION>
                                                                 YEARS ENDED
                                                                  MARCH 31,
                                                              -----------------
DISCONTINUED OPERATIONS                                        1997      1998
<S>                                                           <C>       <C>
Revenues....................................................  $86,664   $13,541
Income before income taxes and minority interest............      314     1,162
Income tax provision (benefit)..............................     (825)      395
Minority interest...........................................       39        --
                                                              -------   -------
Income from operations......................................    1,100       767
Gain on disposal of division of discontinued operations net
  of income taxes...........................................    4,788        --
                                                              -------   -------
          Total net discontinued operations.................  $ 5,888   $   767
                                                              =======   =======
</TABLE>



     The financial statements and related notes have been reclassified to
present financial information for these businesses as discontinued operations.
The results of operations for both businesses have been classified as
discontinued operations in the consolidated statements of income and are shown
net of related income tax expense.


(18) COMMITMENTS AND CONTINGENCIES

     In June 1997, the Company, in connection with a financing effected to
provide funds for the acquisition of TEST and other corporate purposes,
distributed all of the outstanding stock of PTH then owned by the Company to its
then sole stockholder, Capricorn. In connection with the distribution, the
Company received an opinion of counsel to the effect that the distribution would
be tax-free to both the Company and Capricorn. Tax-free treatment of the
distribution depends, in part, upon the underlying facts and circumstances at
the time of the distribution. There can be no assurance that the Internal
Revenue Service will agree with the Company's and its counsel's interpretation
of such facts and circumstances. If the Internal Revenue Service were to
challenge the tax-free treatment of the distribution and such challenge were
ultimately to prevail, the Company would be treated as recognizing gain with
respect to the distribution in an amount equal to the excess of the fair market
value of the PTH stock at the time of the distribution over its tax basis to the
Company. Such treatment could have a material adverse effect on the Company's
results of operations and financial condition.

(19) LITIGATION


     We are a party to various routine legal proceedings. These primarily
involve commercial claims, products liability claims, asbestos related personal
injury claims and workers' compensation claims. We cannot predict the outcome of
these lawsuits, legal proceedings and claims with certainty. Nevertheless, we
believe that the outcome of all of these proceedings, even if determined
adversely, would not have a material adverse effect on our business or financial
condition.



(20) INDUSTRY SEGMENTS AND GEOGRAPHIC INFORMATION



     The Company has adopted the provisions of SFAS No. 131, Disclosures About
Segments of an Enterprise and Related Information. The Company's eight business
units have separate management teams and infrastructures that offer different
products and services. The business units have been aggregated into four
reportable segments (described below) since the long-term financial performance
of these reportable segments is affected by similar economic conditions.



     Engineered Systems: This segment consists of five business units; U.S.
Engineered Systems, Cynara, NATCO Japan, NATCO Venezuela, and NATCO London, that
provide design, engineering, manufactur-


                                      F-25
<PAGE>   100
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


ing and start-up services for engineered process systems. The principal markets
for this segment include all major oil and gas producing regions of the world
including North America, Latin America, Europe, Africa and the Far East.
Customers include major multi-national, independent and national or state-owned
companies.



     Traditional Production Equipment and Services: U.S. Sales & Service is the
sole business unit reported in this segment. This unit designs, engineers,
manufactures, and provides start-up services for production equipment, which is
generally less complex than those units provided by Engineered Systems. This
segment also provides replacement parts, field and shop servicing of equipment,
and used equipment refurbishing. The principal market for this segment is the
U.S. onshore and offshore market; however this segment does cover international
markets also. Customers include major multi-national, independent and national
or state-owned companies.



     Instrumentation and Electrical Systems: TEST is the sole business unit
reported in this segment. This unit designs, manufactures, installs and services
instrumentation and electrical control systems. The principal markets for this
segment include all major oil and gas producing regions of the world including
North America, Latin America, Europe, Kazakhstan, Africa and the Far East.
Customers include major multi-national, independent and national or state-owned
companies.



     NATCO Canada: This segment consists of our subsidiary in Canada. NATCO
Canada provides design, engineering, manufacturing and start-up services for
engineered process systems. It also provides replacement parts, field and shop
servicing of equipment, and used equipment refurbishing. NATCO Canada has also
done selective manufacturing for the Engineered Systems segment in the past. The
principal markets for this segment are the oil and gas producing regions of
Canada. Customers include major multi-national and independent companies.



     The accounting policies of the reportable segments are the same as those
described in Note 2. The Company evaluates the performance of its operating
segments based on income before net interest expense, income taxes, depreciation
and amortization expense, accounting changes, and nonrecurring items.


                                      F-26
<PAGE>   101
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     Summarized financial information concerning the Company's reportable
segments is shown in the following table.



<TABLE>
<CAPTION>
                                      TRADITIONAL
                                      PRODUCTION    INSTRUMENTATION
                         ENGINEERED   EQUIPMENT &    & ELECTRICAL      NATCO    CORPORATE &
                          SYSTEMS      SERVICES         SYSTEMS       CANADA    ELIMINATIONS   CONSOLIDATED
<S>                      <C>          <C>           <C>               <C>       <C>            <C>
March 31, 1997
  Revenues.............   $43,607       $56,899             --        $31,995     $(5,844)       $126,657
  Segment profit
     (loss)............       633         4,214             --          3,018      (5,054)          2,811
  Total assets.........    14,203        22,739             --         13,740       9,879          60,561
  Capital
     expenditures......       511           372             --            163         113           1,159
  Depreciation and
     amortization......       197           400             --            120         145             862
March 31, 1998
  Revenues.............    34,250        76,782         33,181         59,721      (1,911)        202,023
  Segment profit
     (loss)............    (1,131)        7,251          3,485          6,465      (4,401)         11,669
  Total assets.........    11,778        30,214         23,668         17,264      12,489          95,413
  Capital
     expenditures......       419           383            301            139          14           1,256
  Depreciation and
     amortization......       204           392            445            130         151           1,322
December 31, 1998
  Revenues.............    35,205        51,858         35,553         28,277      (5,282)        145,611
  Segment profit
     (loss)............     1,500         3,031          3,944          2,425      (3,420)          7,480
     Total assets......    37,022        27,543         24,137         14,052      15,658         118,412
     Capital
       expenditures....       191           391            169            871          14           1,636
     Depreciation and
       amortization....       436           295            445            187         110           1,473
</TABLE>


                                      F-27
<PAGE>   102
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


     The Company's geographic data for continuing operations for the years ended
March 31, 1997 and 1998 and the nine months ended December 31, 1998 are as
follows:



<TABLE>
<CAPTION>
                                  UNITED              UNITED             CORPORATE &
                                  STATES    CANADA    KINGDOM   OTHER    ELIMINATIONS   CONSOLIDATED
<S>                              <C>        <C>       <C>       <C>      <C>            <C>
MARCH 31, 1997
Revenues from unaffiliated
  customers....................  $ 92,518   $28,099   $ 3,464   $2,576     $    --        $126,657
Revenues from affiliates.......     1,385     3,896       443      120      (5,844)             --
                                 --------   -------   -------   ------     -------        --------
Revenues.......................  $ 93,903   $31,995   $ 3,907   $2,696     $(5,844)       $126,657
                                 --------   -------   -------   ------     -------        --------
Operating income (loss)........  $    416   $ 2,076   $(1,247)  $  294     $(2,283)       $   (744)
Identifiable assets............  $ 45,357   $13,740   $ 2,408   $1,165     $(2,109)       $ 60,561
Discontinued assets............                                                              9,483
                                                                                          --------
                                                                                          $ 70,044
                                                                                          --------
MARCH 31, 1998
Revenues from unaffiliated
  customers....................  $132,004   $59,701   $ 4,772   $5,546     $    --        $202,023
Revenues from affiliates.......       909        20       327      202      (1,458)             --
                                 --------   -------   -------   ------     -------        --------
Revenues.......................  $132,913   $59,721   $ 5,099   $5,748     $(1,458)       $202,023
                                 --------   -------   -------   ------     -------        --------
Operating income (loss)........  $  6,458   $ 6,074   $(1,793)  $1,179     $(2,778)       $  9,140
Identifiable assets............  $ 73,884   $17,264   $ 4,792   $1,582     $(2,109)       $ 95,413
DECEMBER 31, 1998
Revenues from unaffiliated
  Customers....................  $113,396   $25,793   $ 2,152   $4,270     $    --        $145,611
Revenues from affiliates.......     2,494     2,484        78      226      (5,282)             --
                                 --------   -------   -------   ------     -------        --------
Revenues.......................  $115,890   $28,277   $ 2,230   $4,496     $(5,282)       $145,611
                                 --------   -------   -------   ------     -------        --------
Operating income (loss)........  $  3,328   $ 2,173   $  (505)  $  959     $(2,707)       $  3,248
Identifiable assets............  $100,671   $14,052   $ 1,750   $4,048     $(2,109)       $118,412
</TABLE>



     Corporate expenses consist of corporate overhead and research and
development expenses. Revenue from one customer in Canada for the year ended
March 31, 1998 amounted to $19,923. The contract was awarded to NATCO Canada
principally as the result of sales efforts made by NATCO Corporate personnel
located in the United States.



(21) OFFICE CLOSURE



     During 1997, the Company began winding down the operations of Natco U.K.
Ltd. These activities include, transferring the net assets and employees at the
Company's parts and service business to a new U.S. subsidiary, Natco London,
Inc., and resolving pending severance, office closure and leasehold issues.
Included in the March 31, 1998 statement of operations is a charge of $282
recognized as the estimated cost to exit these activities, which principally
consists of lease termination costs, and professional fees associated with
winding down the operation.



     During the six months ended June 30, 1999, the Company completed the
closure and reached favorable settlements related to various amounts owed to and
by customers and vendors related to a number of contracts entered into between
1993 and 1995. The accrual for the costs associated with these various claims
had been accrued in fiscal years 1995 through 1998 based on the best available
information at that time. In connection with these favorable settlements, the
Company reversed $509 of these accruals.


                                      F-28
<PAGE>   103
                       NATCO GROUP INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


(22) SUBSEQUENT EVENTS



     On August 4, 1999, the Company sold a non-utilized facility which had been
leased under a long-term agreement for $950. The net book value of the facility
at June 30, 1999 was approximately $385. Proceeds from the sale were used to
retire the industrial development revenue bond related to the facility which
amounted to $715, with the remaining amount applied to the Company's outstanding
revolver balances.



     In September 1999, the Company executed non-binding letters of intent to
acquire Porta-Test International Inc. and Engineering Specialties, Inc.
Porta-Test will be acquired for cash and a note totaling approximately $6.1
million, net of cash acquired. Engineering Specialties, Inc. will be acquired
for cash totaling approximately $7.3 million, net of cash and marketable
securities acquired. Both of these transactions are subject to negotiation and
execution of definitive agreements.


                                      F-29
<PAGE>   104


                         REPORT OF INDEPENDENT AUDITORS



Board of Directors


The Cynara Company



     We have audited the accompanying balance sheets of The Cynara Company (the
"Company") as of December 31, 1997 and 1996, and the related statements of
operations, stockholders' equity, and cash flows for the year ended December 31,
1997 and the period from March 5, 1996 (date of inception) to December 31, 1996.
These financial statements are the responsibility of the Company's management.
Our responsibility is to express an opinion on these financial statements based
on our audits.



     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.



     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of the Company at December 31,
1997 and 1996, and the results of its operations and its cash flows for the year
ended December 31, 1997 and the period from March 5, 1996 (date of inception) to
December 31, 1996, in conformity with generally accepted accounting principles.



ERNST & YOUNG LLP



Houston, Texas


February 27, 1998,


  except for Note 15, as to which the date is


  May 29, 1998


                                      F-30
<PAGE>   105

                               THE CYNARA COMPANY

                                 BALANCE SHEETS


<TABLE>
<CAPTION>
                                                               DECEMBER 31
                                                         ------------------------   SEPTEMBER 30
                                                            1996         1997           1998
                                                                                    (UNAUDITED)
<S>                                                      <C>          <C>           <C>
                        ASSETS
Current assets:
  Cash.................................................  $  646,714   $ 2,556,540   $   390,645
  Restricted cash......................................          --       262,000       262,000
  Accounts receivable..................................   1,089,524       347,270     2,483,166
  Stockholder advances.................................     101,579            --            --
  Inventories..........................................   1,545,493     2,631,753     2,640,183
  Costs and estimated earnings in excess of billings on
     uncompleted contracts.............................     191,788       620,579     1,098,953
  Prepaids and other current assets....................     200,395       210,955       266,401
                                                         ----------   -----------   -----------
          Total current assets.........................   3,775,493     6,629,097     7,141,348
  Property, plant, and equipment, net..................   4,055,091     8,798,151     8,838,884
  Loan origination fees................................     161,662        92,625        88,529
  Other assets.........................................      67,500        52,500        40,000
                                                         ----------   -----------   -----------
          Total assets.................................  $8,059,746   $15,572,373   $16,108,761
                                                         ==========   ===========   ===========
         LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable.....................................  $  883,845   $ 1,836,602   $ 1,909,286
  Accrued compensation and benefits....................     308,707       442,794       431,262
  Stockholder distributions payable....................          --       263,189            --
  Billings in excess of costs and estimated earnings on
     uncompleted contracts.............................          --       235,878       179,863
  Other accrued liabilities............................     425,022       943,759       802,105
  Common stock warrants liability......................      60,903       493,480       294,655
  Current maturities of long-term debt.................     969,599     1,300,000     1,300,000
                                                         ----------   -----------   -----------
          Total current liabilities....................   2,648,076     5,515,702     4,917,171
  Long-term debt.......................................   3,784,798     7,138,000     9,566,282
  Stockholders' equity:
  Class A common stock, voting, $.001 par value:
     Authorized shares -- 90,000
     Issued and outstanding shares -- 50,000...........          50            50            50
  Class B common stock, nonvoting, $.001 par value:
     Authorized shares -- 10,000
     Issued and outstanding shares -- None.............          --            --            --
  Additional paid-in capital...........................   1,659,377     1,659,377     1,659,377
  Retained earnings (accumulated deficit)..............     (32,555)    1,259,244       (34,119)
                                                         ----------   -----------   -----------
          Total stockholders' equity...................   1,626,872     2,918,671     1,625,308
                                                         ----------   -----------   -----------
          Total liabilities and stockholders' equity...  $8,059,746   $15,572,373   $16,108,761
                                                         ==========   ===========   ===========
</TABLE>


                            See accompanying notes.
                                      F-31
<PAGE>   106

                               THE CYNARA COMPANY

                            STATEMENTS OF OPERATIONS


<TABLE>
<CAPTION>
                                               PERIOD FROM
                                              MARCH 5, 1996                         NINE MONTHS ENDED
                                           (DATE OF INCEPTION)    YEAR ENDED          SEPTEMBER 30,
                                             TO DECEMBER 31,     DECEMBER 31,   --------------------------
                                                  1996               1997          1997           1998
                                                                                       (UNAUDITED)
<S>                                        <C>                   <C>            <C>           <C>
Revenues:
  Construction projects and module
     revenues............................      $  996,125        $13,814,684    $ 8,813,553   $  8,553,129
  Processing services and other
     revenues............................       3,041,497          4,811,948      3,812,399      3,549,436
                                               ----------        -----------    -----------   ------------
                                                4,037,622         18,626,632     12,625,952     12,102,565
Cost of revenues:
  Construction projects and module
     revenues............................         701,552          8,339,673      5,065,826      5,227,476
  Processing services and other
     revenues............................       1,566,211          3,276,574      2,696,547      4,494,591
                                               ----------        -----------    -----------   ------------
                                                2,267,763         11,616,247      7,762,373      9,722,067
                                               ----------        -----------    -----------   ------------
Gross profit.............................       1,769,859          7,010,385      4,863,579      2,380,498
Operating expenses:
  Research and development...............         116,656            309,237        150,103        252,005
  Management fees to related party.......          86,624            327,940        225,000        294,565
  Selling, general, and administrative...       1,183,625          3,150,287      1,808,270      2,474,633
                                               ----------        -----------    -----------   ------------
          Total operating expenses.......       1,386,905          3,787,464      2,183,373      3,021,203
                                               ----------        -----------    -----------   ------------
Operating income (loss)..................         382,954          3,222,921      2,680,206       (640,705)
Interest expense.........................        (341,712)        (1,233,989)      (486,712)      (505,361)
Other income, net........................           3,352             43,637         57,798         25,176
Equity loss in Partnership...............          (9,082)                --             --             --
                                               ----------        -----------    -----------   ------------
          Net income (loss)..............      $   35,512        $ 2,032,569    $ 2,251,292   $ (1,120,890)
                                               ==========        ===========    ===========   ============
</TABLE>


                            See accompanying notes.
                                      F-32
<PAGE>   107

                               THE CYNARA COMPANY

                       STATEMENTS OF STOCKHOLDERS' EQUITY


<TABLE>
<CAPTION>
                                                                          RETAINED
                                    CLASS A      CLASS A   ADDITIONAL     EARNINGS         TOTAL
                                  COMMON STOCK   COMMON     PAID-IN     (ACCUMULATED   STOCKHOLDERS'
                                     SHARES       STOCK     CAPITAL       DEFICIT)        EQUITY
<S>                               <C>            <C>       <C>          <C>            <C>
Common stock issued at March 5,
  1996 (date of inception)......     16,320        $16     $   59,411   $        --     $    59,427
  Issuance of common stock......     33,680         34      1,599,966            --       1,600,000
  Distributions to
     stockholders...............         --         --             --       (68,067)        (68,067)
  Net income....................         --         --             --        35,512          35,512
                                     ------        ---     ----------   -----------     -----------
Balance at December 31, 1996....     50,000         50      1,659,377       (32,555)      1,626,872
  Distributions to
     stockholders...............         --         --             --      (740,770)       (740,770)
  Net income....................         --         --             --     2,032,569       2,032,569
                                     ------        ---     ----------   -----------     -----------
Balance at December 31, 1997....     50,000         50      1,659,377     1,259,244       2,918,671
  Distributions to stockholders
     (unaudited)................         --         --             --      (172,473)       (172,473)
  Net loss (unaudited)..........         --         --             --    (1,120,890)     (1,120,890)
                                     ------        ---     ----------   -----------     -----------
Balance at September 30, 1998
  (unaudited)...................     50,000        $50     $1,659,377   $   (34,119)    $ 1,625,308
                                     ======        ===     ==========   ===========     ===========
</TABLE>


                            See accompanying notes.
                                      F-33
<PAGE>   108

                               THE CYNARA COMPANY

                            STATEMENTS OF CASH FLOWS


<TABLE>
<CAPTION>
                                             PERIOD FROM
                                            MARCH 5, 1996
                                              (DATE OF                           NINE MONTHS
                                            INCEPTION) TO    YEAR ENDED      ENDED SEPTEMBER 30,
                                            DECEMBER 31,    DECEMBER 31,   ------------------------
                                                1996            1997          1997         1998
                                                                                 (UNAUDITED)
<S>                                         <C>             <C>            <C>          <C>
OPERATING ACTIVITIES
Net income (loss).........................   $    35,512     $2,032,569    $2,251,292   $(1,120,890)
Adjustments to reconcile net income (loss)
  to net cash provided by (used in)
  operating activities:
  Depreciation and amortization...........       429,600      1,175,780       705,003     1,610,348
  Amortization of loan origination fees
     and debt discount....................        69,188        212,140       103,629        15,795
  Loss on disposal of fixed assets........            --         52,365            --      (198,825)
  Common stock warrants revaluation.......            --        432,577            --            --
  Equity loss in Partnership..............         9,082             --            --            --
  Change in assets and liabilities:
     Restricted cash......................            --       (262,000)     (262,000)           --
     Accounts receivable..................       482,608        742,254       942,188    (2,135,896)
     Inventory............................        67,774     (1,086,260)     (456,125)       (8,430)
     Costs and estimated earnings in
       excess of billings on uncompleted
       contracts..........................      (191,788)      (428,791)     (215,289)     (478,374)
     Prepaids and other current assets....      (184,738)       (10,560)     (139,336)      (55,446)
     Accounts payable.....................       453,534        952,757       718,525        72,684
     Billings in excess of costs and
       estimated earnings on uncompleted
       contracts..........................            --        235,878            --       (56,015)
     Other accrued liabilities............       411,183        652,824       651,884      (416,373)
     Other................................            --             --       101,578            --
                                             -----------     ----------    ----------   -----------
Net cash provided by (used in) operating
  activities..............................     1,581,955      4,701,533     4,401,349    (2,771,422)
INVESTING ACTIVITIES
Capital expenditures......................      (360,848)    (3,601,205)   (2,182,838)   (1,638,582)
Acquisition, net of cash acquired.........    (6,589,297)    (2,355,000)           --            --
                                             -----------     ----------    ----------   -----------
Net cash used in investing activities.....    (6,950,145)    (5,956,205)   (2,182,838)   (1,638,582)
FINANCING ACTIVITIES
Proceeds from revolving loans and term
  loans...................................     6,700,000     13,288,000     2,050,000     5,865,589
Payments on revolving loans and long-term
  loans...................................    (1,900,000)    (9,650,000)   (1,850,000)   (3,437,307)
Loan origination fees.....................      (215,550)       (97,500)      (46,875)      (11,700)
Issuance of common stock..................     1,600,000             --            --            --
Issuance of common stock warrants.........           100             --            --            --
Distributions to stockholders.............      (169,646)      (376,002)     (477,580)     (172,473)
                                             -----------     ----------    ----------   -----------
Net cash provided by (used in) financing
  activities..............................     6,014,904      3,164,498      (324,455)    2,244,109
                                             -----------     ----------    ----------   -----------
Increase (decrease) in cash...............       646,714      1,909,826     1,894,056    (2,165,895)
Cash at beginning of period...............            --        646,714       646,714     2,556,540
                                             -----------     ----------    ----------   -----------
Cash at end of period.....................   $   646,714     $2,556,540    $2,540,770   $   390,645
                                             ===========     ==========    ==========   ===========
</TABLE>


                            See accompanying notes.
                                      F-34
<PAGE>   109

                               THE CYNARA COMPANY

                         NOTES TO FINANCIAL STATEMENTS
                               DECEMBER 31, 1997

1. ORGANIZATION AND BASIS OF PRESENTATION

     The Cynara Company, formerly RHRK Holdings, Inc., was incorporated on March
5, 1996 as an S corporation by Robert J. Hamaker ("Hamaker") and Ralph M. Kelly
("Kelly"). Hamaker and Kelly each contributed his 5% limited interest in a
partnership known as The Cynara Company (the "Partnership") in exchange for
8,160 shares each of Class A common stock of the company. Effective July 1,
1996, concurrent with the acquisition described in Note 3, the company changed
its name to The Cynara Company (the "Company").


     The Company uses hollow fiber membranes to separate CO(2) from streams of
fluids produced from oil and gas reservoirs. The Company designs, constructs,
sells, leases, or owns and operates commercial CO(2) separation plants using
this process in the Gulf Coast region of the U.S., Southeast Asia, and South
America. The Company either sells equipment to or contracts with operators of
such reservoirs to perform such separations on a fee basis.


     Effective July 1, 1996, concurrent with the acquisition described in Note
3, a group of individual investors (collectively, "HHDS&P" or the "Majority
Stockholders") individually purchased a total of 33,680 shares of the Company's
Class A common stock for $1.6 million. Concurrently, Hamaker and Kelly each
individually sold certain of his Class A common stock to an individual HHDS&P
investor, resulting in the Majority Stockholders controlling 80% of the
outstanding shares of Class A common stock, with Hamaker and Kelly each
controlling 10%.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

 INTERIM INFORMATION


     The financial statements included herein as of September 30, 1998, and for
the nine months ended September 30, 1998 and 1997 are unaudited, and, in the
opinion of management, the information furnished reflects all material
adjustments, consisting of normal recurring adjustments necessary for a fair
statement of the results for the interim periods presented.


 REVENUE RECOGNITION

     The Company accounts for earnings from long-term construction contracts on
the percentage-of-completion method of accounting. Under the
percentage-of-completion method, earnings on contracts-in-process are recognized
based on the percentage of estimated total earnings that costs incurred bear to
currently estimated total costs on each contract, commencing when sufficient
progress has been made to estimate final results with reasonable accuracy.
Provisions are made for the full amounts of anticipated losses in the period in
which they are first determinable. Costs and estimated earnings on contracts-in-
process in excess of amounts billed are reported as a current asset. Amounts
billed on contracts-in-process in excess of related costs and estimated earnings
are reported as a current liability.


     Revenues from CO(2) separation services are based on volumes processed and
revenues from membrane module sales are recognized when the modules are shipped.


 CASH EQUIVALENTS

     The Company considers all highly liquid investments with an original
maturity date of three months or less to be cash equivalents.

                                      F-35
<PAGE>   110
                               THE CYNARA COMPANY

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

 PROPERTY, PLANT, AND EQUIPMENT

     Property, plant, and equipment are stated at cost. Depreciation is computed
on the straight-line method over the estimated useful lives of the assets.
Expenditures for major improvements which extend the lives of property and
equipment are capitalized, while minor replacements, maintenance, and repairs
are charged to operations as incurred.

  RESEARCH AND DEVELOPMENT COSTS

     The costs of materials and equipment that are acquired for research and
development activities, and which have alternative future uses, are capitalized
and depreciated over the period of future benefit. All other research and
development costs are charged to operations as incurred.

  INVENTORIES

     Inventories are stated at the lower of cost or market value, using average
cost for raw materials and standard cost for work-in-progress and finished
membrane modules, which approximates actual cost.

  USE OF ESTIMATES

     Management is required to make estimates and assumptions that affect the
amounts reported in the financial statements and accompanying notes. Actual
results could differ from those estimates.

  CONCENTRATIONS OF CREDIT RISK

     Financial instruments which subject the Company to concentrations of credit
risk consist principally of trade receivables. The Company's policy is to
evaluate each customer's financial condition and determine the amount of credit
to be extended. The Company sells to a limited number of customers, primarily in
the petrochemical industry. Collateral is generally not required on these
receivables. At December 31, 1997 and 1996, there were no allowances for
doubtful accounts.

  RECLASSIFICATIONS

     Certain reclassifications have been made to the prior year financial
statements to conform to the current year presentation.

3. ACQUISITION


     Effective July 1, 1996, the Company purchased Dow's 90% interest in the
Partnership and certain other assets (primarily inventory and certain
Pittsburgh, California, membrane manufacturing plant assets) from Dow. The
acquisition was accounted for under the purchase method of accounting, whereby
all of the assets and liabilities acquired were adjusted to their fair values at
the acquisition date, which approximated the purchase price. The tentative
purchase price at July 1, 1996 was $7.1 million and consisted of $6.3 million in
cash, assumption of certain liabilities of $454,000, and acquisition costs of
$300,000. Effective immediately prior to the acquisition on July 1, 1996, the
Partnership distributed certain net liabilities of approximately $174,000 to the
Company. The final purchase price was contingent upon the resolution of an
operating agreement with Pennzoil for CO(2) separation services at the SACROC
Unit, as more fully described in Note 4. In August 1997, the Company negotiated
a new operating agreement with Pennzoil and was required to pay an additional
cash consideration of $2,355,000, resulting in a total purchase price of
$9,455,000. The additional purchase price was allocated to the SACROC Unit. The
financial statements reflect all operations of the acquired entity from July 1,
1996 through December 31, 1997.


                                      F-36
<PAGE>   111
                               THE CYNARA COMPANY

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)


4. CO(2) SEPARATION SERVICES



     The Partnership had an operating agreement with Pennzoil (assumed from
Chevron U.S.A., Inc., in 1994) to provide CO(2) separation services at a
facility in Snyder, Texas (the "SACROC Unit"). Separation services began at the
SACROC Unit in December 1983 and the agreement expired in August 1993, with
automatic annual renewals. In May 1996, Pennzoil notified the Partnership of its
intent to terminate the agreement effective September 1, 1996. The Company, as
successor to the Partnership, continued to provide CO(2) separation services at
the SACROC Unit on a month-to-month basis until August 1997. In August 1997, the
Company entered into a new agreement with Pennzoil to provide such services. The
agreement expires February 2008, with automatic annual renewals unless either
party provides written notice of termination at least 90 days prior to the
renewal date.



     In August 1996, the Company began operations under an agreement with Texaco
to provide CO(2) separation services at a facility in Paradis, Louisiana (the
"Paradis Unit"). The agreement expires July 31, 2001, with automatic annual
renewals unless either party provides written notice of termination at least 90
days prior to the renewal date.


     Approximately $3.3 million and $1.3 million of total revenues resulted from
separation services at the SACROC Unit and Paradis Unit, respectively, for the
year ended December 31, 1997. Approximately $2.3 million and $500,000 of total
revenues resulted from separation services at the SACROC Unit and Paradis Unit,
respectively, for the period from March 5, 1996 (date of inception) to December
31, 1996.

5. COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS

     In January 1997, the Company entered into a long-term construction contract
valued at approximately $18.2 million with Unocal Thailand, Ltd. ("Unocal"). The
contract is estimated to be completed in the second quarter of 1998. At December
31, 1997, the Company has issued a $1.5 million letter of credit for the benefit
of Unocal, which reduces the available borrowing base under the revolving loan
described in Note 8.

     In July 1997, the Company entered into a long-term construction contract
valued at approximately $2.6 million with Total Exploration and Production
Thailand ("Total"). The contract is estimated to be completed in the second
quarter of 1998. At December 31, 1997, the Company has restricted cash of
$262,000 to secure its performance on this contract.

     For the year ended December 31, 1997, approximately $12.6 million and
$601,000 of the Company's revenues resulted from the contracts with Unocal and
Total, respectively.

  UNAUDITED

     In March 1998, management lowered the estimated cost to complete the Unocal
contract. As a result, the Company determined the contract to be approximately
92% complete for purposes of revenue recognition compared to 84% complete prior
to the revision in estimate. This change in estimate resulted in a $1.5 million
revenue recognition adjustment.

                                      F-37
<PAGE>   112
                               THE CYNARA COMPANY

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

6. INVENTORIES


     Inventories consist of the following at December 31 and September 30:



<TABLE>
<CAPTION>
                                                                            SEPTEMBER 30,
                                                     1996         1997          1998
                                                                             (UNAUDITED)
<S>                                               <C>          <C>          <C>
Raw materials...................................  $  171,375   $  335,895    $  581,288
Work-in-progress................................     183,155      420,458       146,390
Finished goods..................................   1,190,963    1,875,400     1,912,505
                                                  ----------   ----------    ----------
                                                  $1,545,493   $2,631,753    $2,640,183
                                                  ==========   ==========    ==========
</TABLE>


7. PROPERTY, PLANT, AND EQUIPMENT

     Property, plant, and equipment consist of the following at December 31:

<TABLE>
<CAPTION>
                                                 ESTIMATED
                                                USEFUL LIFE       1996         1997
<S>                                            <C>             <C>          <C>
Leasehold improvements.......................  Up to 5 years   $  184,269   $   188,446
Machinery and equipment......................        5 years    4,054,932     8,854,407
Furniture and fixtures.......................        7 years       58,134       112,311
Computers and office equipment...............        5 years      158,566       296,156
Construction-in-progress.....................                      21,290       907,269
                                                               ----------   -----------
                                                                4,477,191    10,358,589
Less accumulated depreciation................                     422,100     1,560,438
                                                               ----------   -----------
Property, plant, and equipment, net..........                  $4,055,091   $ 8,798,151
                                                               ==========   ===========
</TABLE>

     Depreciation expense for the year ended December 31, 1997 and for the
period from March 5, 1996 (date of inception) to December 31, 1996 was
$1,161,000 and $436,000, respectively. During 1997, the Company disposed of
certain fixed assets which were used primarily in an older manufacturing
process. The loss on disposal of such assets was approximately $52,000 and is
netted with other income in the statement of operations.

                                      F-38
<PAGE>   113
                               THE CYNARA COMPANY

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

8. LONG-TERM DEBT

     Long-term debt consists of the following at December 31:


<TABLE>
<CAPTION>
                                                                 1996         1997
<S>                                                           <C>          <C>
Term loan with Bank One Capital Partners II, LTD ("BOCP");
  interest payable quarterly at a rate of 12%, principal
  payable in quarterly installments of $250,000 commencing
  March 31, 1997, due July 1, 2001, secured by all assets of
  the Company...............................................  $4,500,000           --
Revolving loan with BOCP; interest payable monthly at a rate
  of prime plus 1 1/2%, due the earlier of July 1, 1998 or
  the date the term loan is paid in full, secured by all
  assets of the Company.....................................     300,000           --
Term loan with Bank One; interest payable quarterly at a
  rate of 9.5%, principal payable in quarterly installments
  of $325,000 commencing March 31, 1998, due December 31,
  2002, secured by all assets of the Company................          --   $7,000,000
Revolving loan with Bank One; interest payable monthly at a
  rate of 8.5%, due October 8, 1999, secured by all assets
  of the Company............................................          --    1,438,000
Less debt discount..........................................     (45,603)          --
                                                              ----------   ----------
                                                               4,754,397    8,438,000
Less current maturities, including related debt discount....     969,599    1,300,000
                                                              ----------   ----------
Long-term debt due after one year...........................  $3,784,798   $7,138,000
                                                              ==========   ==========
</TABLE>


     Upon resolution of the SACROC operating agreement, as more fully described
in Note 4, the Company refinanced all of its outstanding borrowings with Bank
One. The debt agreement provides for a term loan of $7.0 million and a revolving
loan not to exceed $6.0 million. The Company has issued a $1.5 million letter of
credit which reduces the available borrowing base under the revolving loan. A
commitment fee of 0.5% is charged on the unused portion of the revolving loan.
In 1997, the Company paid loan origination fees of approximately $98,000, which
are being amortized to interest expense over five years. The revolving loan is
subject to certain borrowing base requirements based primarily on current asset
balances. The existing debt agreement provides, among other things, for the
maintenance of certain minimums, as defined, for working capital, net worth,
liquidity, and cash flow coverage of debt service.

     Scheduled maturities of the Company's long-term debt are as follows for the
years ending December 31:

<TABLE>
<S>                                                        <C>
1998....................................................   $1,300,000
1999....................................................    2,738,000
2000....................................................    1,300,000
2001....................................................    1,300,000
2002 and thereafter.....................................    1,800,000
                                                           ----------
                                                           $8,438,000
                                                           ==========
</TABLE>

     The Company paid interest of $464,000 and $259,000 during the year ended
December 31, 1997 and for the period from March 5, 1996 (date of inception) to
December 31, 1996, respectively. The carrying value of the Company's long-term
debt approximates its fair value, as the interest rates on outstanding
borrowings approximate the market rate.

                                      F-39
<PAGE>   114
                               THE CYNARA COMPANY

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

9. INCOME TAXES

     The stockholders have elected to treat the Company as an S corporation, as
defined by the Internal Revenue Code. In general, the corporate income or loss
of an S corporation is allocated to the stockholders for inclusion in their
personal federal income tax returns. As a result, federal income taxes are not
reflected in these financial statements.

10. COMMITMENTS

     The Company leases certain equipment and facilities under operating leases
that expire at various dates through 2002. Minimum rental commitments under all
noncancelable leases with an initial term in excess of one year are payable as
follows:
<TABLE>
<S>                                                        <C>
1998....................................................   $  493,035
1999....................................................      244,255
2000....................................................      152,530
2001....................................................      152,530
2002....................................................      152,530
                                                           ----------
                                                           $1,194,880
                                                           ==========
</TABLE>

     Total rental expense charged to operations during the year ended December
31, 1997 and for the period from March 5, 1996 (date of inception) to December
31, 1996 was $523,775 and $233,174, respectively.

     From time to time, the Company is subject to claims arising in the ordinary
course of business. In the opinion of management, the ultimate outcome of these
claims is not expected to have a material adverse effect on the financial
statements.

11. RELATED PARTY TRANSACTIONS


     The Company entered into a management services agreement with HHDS&P
whereby the Company pays monthly management fees to HHDS&P for certain
management services provided. Unpaid management fees and expenses were
approximately $188,000 and $38,000 at December 31, 1997 and 1996, respectively.


12. STOCKHOLDERS AGREEMENT

     The Company entered into a Stockholders Agreement (the "Agreement") on July
1, 1996 with the holders of its outstanding shares of common stock and BOCP. The
Agreement provides the stockholders and BOCP the right of first refusal to
purchase the selling stockholder's shares. The Agreement also provides the
stockholders and BOCP the right of co-sale when a selling stockholder elects a
third-party offer when such selling shares are not purchased under the right of
first refusal. The Agreement further states that the Majority Stockholders may
require, with 30 days' written notice, the other stockholders and BOCP to sell
their shares to a purchaser on the same terms and for the same price that the
Majority Stockholders have agreed to sell their shares.

     The Agreement provides Hamaker and Kelly the right, if terminated for any
reason other than for cause, to require the Company to purchase all of their
outstanding shares. Conversely, the Agreement also provides the Company the
option, if Hamaker or Kelly is terminated for cause, to purchase all of the
outstanding shares held by the terminated employee. The put or call option price
per share shall be the fair market value per share of the Company on a fully
diluted basis, as mutually determined by the parties or a financial institution.

                                      F-40
<PAGE>   115
                               THE CYNARA COMPANY

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

     The Agreement allows quarterly distributions to be made to the
stockholders, to the extent permitted under the Company's debt agreement, to
satisfy the stockholder's aggregate federal and state income tax liability
incurred in respect to the income of the Company. The Company may require
stockholders to refund distributions in excess of the stockholders' aggregate
tax liability, or the Company may reduce the first distribution of the following
year. During the year ended December 31, 1997, the Company distributed cash of
$376,000, and an additional $263,000 is recorded as stockholder distributions
payable in the balance sheet. During the period from March 5, 1996 (date of
inception) to December 31, 1996, the Company distributed cash of $170,000 to
stockholders, of which $102,000 is recorded as stockholder advances in the
balance sheet.

     The Agreement allows stockholders to exchange their shares of Class A
voting common stock for Class B nonvoting common stock and vice versa upon
written request.

     The Agreement shall terminate upon the earlier of the following: (1) the
sale, transfer, or disposition by Hamaker, Kelly, and BOCP of all their shares;
(2) an initial public offering of the Company's common stock; (3) the sale or
transfer of all of the outstanding common stock to a third-party offeror; or (4)
June 30, 2006.

13. COMMON STOCK WARRANTS AND OPTIONS

     Concurrent with the execution of its debt agreement with BOCP, the Company
issued 1,282 common stock warrants to BOCP in exchange for $100. The proceeds of
the debt and detachable warrants were allocated between the debt and warrants,
resulting in a debt discount. The common stock warrants entitle BOCP the right
to purchase 1,282 shares of Class B nonvoting common stock at $.01 per share.
The warrants also have put rights, which entitle the holder to require the
Company to purchase all of the outstanding warrants or warrant shares at the put
price. The put price is determined based on the fair value, as mutually agreed
by the parties or based on defined formulas. The warrants are recorded at their
estimated put price at December 31, 1997, based on the consideration expected to
be received in conjunction with the proposed merger (as more fully described in
Note 15), and are included in liabilities in the balance sheet. The warrants
expire on October 8, 2002.

     BOCP also has common stock options to purchase 3,846.15 shares of Class B
common stock from the Majority Stockholders at an exercise price of $52.26 per
share.

14. BENEFIT PLAN

     The Company has a 401(k) defined contribution retirement plan covering all
eligible employees. This plan allows for employees to defer up to 16% of their
compensation, with the Company matching 50% of the first 10% of the
participant's contribution. In addition, the Company may make a discretionary
contribution at the end of the plan year. Participants are immediately and fully
vested in employer contributions. The Company's matching contribution charged to
operations for the year ended December 31, 1997 and for the period from March 5,
1996 (date of inception) to December 31, 1996 was $83,000 and $32,000,
respectively.

15. SUBSEQUENT EVENT


     In March 1998, management of the Company announced an agreement in
principle to merge the business of the Company with NATCO Group Inc. ("NATCO").
The transaction is expected to be completed in June 1998 and is contingent on
NATCO's successful initial public offering anticipated to occur in June 1998.
Upon completion, NATCO will own 100% of the Company's capital stock. The Company
has obtained approval of the proposed transaction with the holder of outstanding
borrowings.


                                      F-41
<PAGE>   116


                          INDEPENDENT AUDITORS' REPORT



The Board of Directors


Porta-Test International Inc.:



     We have audited the accompanying balance sheet of Porta-Test International
Inc. as of June 30, 1999, and the related statements of operations,
stockholders' equity and comprehensive loss, and cash flows for the year ended
June 30, 1999. These financial statements are the responsibility of Company's
management. Our responsibility is to express an opinion on these financial
statements based on our audit.



     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.



     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Porta-Test International
Inc. as of June 30, 1999, and the results of its operations and its cash flows
for the year ended June 30, 1999 in conformity with generally accepted
accounting principles.



                                            KPMG LLP



September 17, 1999


Houston, Texas


                                      F-42
<PAGE>   117


                         PORTA-TEST INTERNATIONAL INC.



                                 BALANCE SHEET


                                 JUNE 30, 1999



<TABLE>
<S>                                                            <C>
                           ASSETS
Current assets:
  Cash and cash equivalents.................................   $   80,405
  Trade accounts receivable.................................      613,351
  Inventory.................................................      638,996
  Note receivable from related party........................      137,287
  Investments and other current assets......................      106,772
                                                               ----------
          Total current assets..............................    1,576,811
Property, plant and equipment, net..........................      338,582
                                                               ----------
                                                               $1,915,393
                                                               ==========
            LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Current installments of long-term debt....................   $   93,547
  Bonuses payable...........................................      757,666
  Accounts payable..........................................      357,519
  Accrued expenses and other................................      136,036
  Advances from shareholders................................       68,059
                                                               ----------
          Total current liabilities.........................    1,412,827
Long-term debt, excluding current installments..............      162,843
Deferred tax liability......................................       28,302
                                                               ----------
          Total liabilities.................................    1,603,972
Stockholders' equity:
  Common stock, $.72 par value. Authorized unlimited shares,
     issued and outstanding 100 shares......................           72
  Retained earnings.........................................      322,629
  Accumulated other comprehensive loss......................      (11,280)
                                                               ----------
          Total stockholders' equity........................      311,421
Commitments and contingencies
                                                               ----------
                                                               $1,915,393
                                                               ==========
</TABLE>



                See accompanying notes to financial statements.


                                      F-43
<PAGE>   118


                         PORTA-TEST INTERNATIONAL INC.



                            STATEMENT OF OPERATIONS


                            YEAR ENDED JUNE 30, 1999



<TABLE>
<S>                                                            <C>
Revenues....................................................   $7,255,961
Cost of goods sold..........................................    4,483,103
                                                               ----------
  Gross profit..............................................    2,772,858
Selling, general and administrative expenses................    2,797,026
Depreciation and amortization expense.......................       66,491
                                                               ----------
  Loss from operations......................................      (90,659)
Interest expense, net.......................................       16,464
Loss on disposal of investments and other assets, net.......      109,263
                                                               ----------
  Loss before income taxes..................................     (216,386)
Income tax benefit..........................................       26,946
                                                               ----------
  Net loss..................................................   $ (189,440)
                                                               ==========
</TABLE>



                See accompanying notes to financial statements.


                                      F-44
<PAGE>   119


                         PORTA-TEST INTERNATIONAL INC.



            STATEMENT OF STOCKHOLDERS' EQUITY AND COMPREHENSIVE LOSS


                            YEAR ENDED JUNE 30, 1999



<TABLE>
<CAPTION>
                                                                       ACCUMULATED
                                                                          OTHER           TOTAL
                                                 COMMON   RETAINED    COMPREHENSIVE   STOCKHOLDERS'
                                                 STOCK    EARNINGS        LOSS           EQUITY
<S>                                              <C>      <C>         <C>             <C>
Balances at June 30, 1998......................   $72     $ 512,069     $(26,376)       $ 485,765
Comprehensive loss:
  Net loss.....................................    --      (189,440)          --         (189,440)
  Unrealized gains on investments..............    --            --       21,628           21,628
  Foreign currency translation adjustment......    --            --       (6,532)          (6,532)
                                                                                        ---------
          Total comprehensive loss.............    --            --           --         (174,344)
                                                  ---     ---------     --------        ---------
Balances at June 30, 1999......................   $72     $ 322,629     $(11,280)       $ 311,421
                                                  ===     =========     ========        =========
</TABLE>



                See accompanying notes to financial statements.


                                      F-45
<PAGE>   120


                         PORTA-TEST INTERNATIONAL INC.



                            STATEMENT OF CASH FLOWS


                            YEAR ENDED JUNE 30, 1999



<TABLE>
<S>                                                           <C>
Cash flows from operating activities:
  Net loss..................................................  $ (189,440)
  Adjustments to reconcile net income to net cash provided
     by operating activities:
     Depreciation and amortization expense..................      66,491
     Loss on disposal of investments and other assets,
      net...................................................     109,263
     Deferred income taxes..................................      (1,989)
     Changes in operating assets and liabilities:
       Decrease in trade accounts receivable................     318,797
       Decrease in inventories..............................      27,669
       Increase in bonus payable............................     757,666
       Increase in accounts payable.........................      33,883
       Decrease in accrued expenses and other...............     (41,068)
                                                              ----------
          Net cash provided by operating activities.........   1,081,272
                                                              ----------
Cash flows from investing activities:
  Capital expenditures for property, plant and equipment....     (58,901)
  Purchase of investments, net..............................     (24,612)
  Note receivable advances to related party.................    (246,550)
                                                              ----------
          Net cash used in investing activities.............    (330,063)
                                                              ----------
Cash flows from financing activities:
  Decrease is bank overdraft................................    (710,620)
  Proceeds from long-term debt..............................     186,352
  Repayments of advances from shareholders..................     (16,870)
  Repayments of advances from related party.................    (129,666)
                                                              ----------
          Net cash provided by financing activities.........    (670,804)
                                                              ----------
Net increase in cash and cash equivalents...................     791,025
Cash and cash equivalents at beginning of period............          --
                                                              ----------
Cash and cash equivalents at end of period..................  $   80,405
                                                              ==========
Cash payments for:
  Interest..................................................  $   16,464
  Income taxes..............................................      13,753
</TABLE>



                See accompanying notes to financial statements.


                                      F-46
<PAGE>   121


                         PORTA-TEST INTERNATIONAL INC.



                         NOTES TO FINANCIAL STATEMENTS


                                 JUNE 30, 1999


(1) THE COMPANY



     Porta-Test International Inc. (the Company), incorporated in Alberta,
Canada, is a manufacturer of equipment for separating gases, liquids and
suspended solids. The Company's manufacturing facility is located in Edmonton,
Alberta and sales are primarily to customers located in Canada, Mexico and the
United States.



     The Company's financial statements have been prepared in accordance with
accounting principles generally accepted in the United States.



(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES



  CASH EQUIVALENTS



     The Company considers all highly-liquid investment instruments with
original maturities of three months or less to be cash equivalents.



  CONCENTRATION OF CREDIT RISK



     The Company had revenues from one single customer that represented 54% of
revenues for the year ended June 30, 1999.



  INVENTORIES



     Finished goods and work-in-process are valued at the lower of cost and net
realizable value. Raw materials and supplies are valued at the lower of cost and
net replacement cost. Cost is determined principally on a first-in, first-out
basis. Cost includes materials, labor and manufacturing overhead.



  INVESTMENTS



     Investments at June 30, 1999 consist of equity securities which the Company
classifies as available-for-sale. Investments are recorded at fair value, and
unrealized holding gains and losses are excluded from earnings and are reported
as a separate component of other comprehensive income(loss) until realized.



  PROPERTY, PLANT AND EQUIPMENT



     Property, plant and equipment are stated at cost less an allowance for
depreciation. Depreciation on plant and equipment is calculated using the
straight-line method over the estimated useful lives of the assets. Maintenance
and repair costs are expensed as incurred; renewals and betterments are
capitalized. Upon the sale or retirement of properties, the accounts are
relieved of the cost and the related accumulated depreciation, with any
resulting profit or loss included in income. The carrying values of property,
plant and equipment by location are reviewed at least annually or whenever there
are indications that these assets may be impaired.



  FAIR VALUE OF FINANCIAL INSTRUMENTS



     Fair value estimates are made at discrete points in time based on relevant
market information. These estimates may be subjective in nature and involve
uncertainties and matters of significant judgment, and therefore cannot be
determined with precision.



     The Company believes that the carrying amounts of its current assets and
current liabilities approximate the fair value of such items due to their
short-term nature. The carrying amounts of long-term debt approximate fair value
as the interest rates thereon approximate market.


                                      F-47
<PAGE>   122

                         PORTA-TEST INTERNATIONAL INC.



                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)



  REVENUE RECOGNITION



     Revenues from fixed-price and modified fixed-price construction contracts
are recognized on the percentage-of-completion method for each contract.
Contract costs include all direct material and labor costs and those indirect
costs related to contract performance, such as indirect labor, supplies, tools
and repair costs. Selling, general, and administrative costs are charged to
expense as incurred. Provisions for estimated losses on uncompleted contracts
are made in the period in which such losses are determined. Changes in job
performance, job conditions, and estimated profitability, including those
arising from contract penalty provisions, and final contract settlements may
result in revisions to costs and income and are included in revenues when their
realization is reasonably assured. Claims are included in revenues when
realization is probable and can be reliably estimated.



  INCOME TAXES



     Deferred tax assets and liabilities are recognized for the future tax
consequences attributable to differences between the financial statement
carrying amounts of existing assets and liabilities and their respective tax
bases. Deferred tax assets and liabilities are measured using enacted tax rates
expected to apply to taxable income in the years in which those temporary
differences are expected to be recovered or settled. The effect on deferred tax
assets and liabilities of a change in tax rates is recognized in income in the
period that includes the enactment date.



  TRANSLATION OF FOREIGN CURRENCIES



     Financial statement amounts have been translated into their United States
dollar equivalents at exchange rates as follows: (1) balance sheet accounts at
year-end exchange rates, and (2) statement of operations accounts at a weighted
average exchange rate for the period. The gains or losses resulting from such
translations are included in the determination of comprehensive income (loss).
Gains or losses from foreign currency transactions are reflected in the
statement of operations.



  USE OF ESTIMATES



     Management of the Company has made a number of estimates and assumptions
relating to the reported amounts of assets and liabilities and the disclosure of
contingent assets and liabilities and the amounts of revenues and expenses
recognized during the period to prepare these financial statements in conformity
with generally accepted accounting principles. Actual results could differ from
these estimates.



(3) INVENTORIES



     Inventories consist of the following at June 30, 1999:



<TABLE>
<S>                                                           <C>
     Raw materials and supplies.............................  $134,297
     Work-in-process........................................   433,428
     Finished goods.........................................    71,271
                                                              --------
                                                              $638,996
                                                              ========
</TABLE>



(4) INVESTMENTS AND OTHER CURRENT ASSETS



     Investments and other current assets consist of the following at June 30,
1999:



<TABLE>
<S>                                                           <C>
     Short-term investments.................................  $ 84,215
     Other..................................................    22,557
                                                              --------
                                                              $106,772
                                                              ========
</TABLE>


                                      F-48
<PAGE>   123

                         PORTA-TEST INTERNATIONAL INC.



                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)



(5) PROPERTY, PLANT AND EQUIPMENT



     Property, plant and equipment consist of the following at June 30, 1999:



<TABLE>
<CAPTION>
                                                                   ESTIMATED
                                                                  USEFUL LIFE
<S>                                                   <C>         <C>
Buildings and improvements..........................  $  30,177        5 years
Machinery and equipment.............................    373,264   3 - 15 years
Computer and office equipment.......................    116,068    2 - 5 years
                                                      ---------
                                                        519,509
  Less accumulated depreciation.....................   (180,927)
                                                      ---------
                                                      $ 338,582
                                                      =========
</TABLE>



(6) LONG-TERM DEBT



     Long-term debt consists of the following at June 30, 1999:



<TABLE>
<S>                                                            <C>
Bank term loan, with monthly repayments of $8,334 (CAN$)
  plus interest at prime plus 1.25% (7.50% at June 30,
  1999), secured by a general security agreement and a
  postponement of shareholder advances......................   $226,446
Bank term loan, with monthly repayments of $4,167 (CAN$)
  plus interest at prime plus 3/4% (7.00% at June 30, 1999),
  secured by a general security agreement and a postponement
  of shareholder advances...................................     19,802
Bank term loan, with monthly repayments of $712 (CAN$) plus
  interest at prime plus 2% (8.25%) at June 30, 1999),
  secured by an assignment of book debts and a postponement
  of shareholder advances...................................     10,142
                                                               --------
          Total long-term debt..............................    256,390
Less current installments...................................     93,547
                                                               --------
          Long-term debt, less current installments.........   $162,843
                                                               ========
</TABLE>



     At June 30, 1999, aggregate annual future maturities of long-term debt are
as follows:



<TABLE>
<S>                                                            <C>
2000........................................................   $ 93,547
2001........................................................     72,279
2002........................................................     67,940
2003........................................................     22,624
                                                               --------
                                                               $256,390
                                                               ========
</TABLE>



(7) ADVANCES FROM SHAREHOLDERS



     Advances from shareholders are due on demand, bear no interest and have no
fixed terms of repayment. As such, these advances have been classified as
current on the accompanying balance sheet.



(8) INCOME TAXES



     Income tax benefit consists of the following for the year ended June 30,
1999:



<TABLE>
<S>                                                           <C>
Current-Foreign.............................................  $24,957
Deferred-Foreign............................................    1,989
                                                              -------
          Total.............................................  $26,946
                                                              =======
</TABLE>


                                      F-49
<PAGE>   124

                         PORTA-TEST INTERNATIONAL INC.



                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)



     The tax effects of temporary differences that give rise to significant
portions of the deferred tax liabilities at June 30, 1999, are as follows:



<TABLE>
<S>                                                           <C>
  Property, plant and equipment.............................  $28,302
                                                              -------
          Total deferred tax liabilities....................  $28,302
                                                              =======
</TABLE>



     Income tax benefit for the year ended June 30, 1999 differs from the amount
computed by applying the U.S. federal income tax rate of 34% to loss before
income taxes as a result of the following:



<TABLE>
<S>                                                           <C>
Income tax benefit computed at U.S. statutory rate..........  $ 73,571
Differences between U.S. and foreign tax rate...............   (32,458)
Other.......................................................   (14,167)
                                                              --------
                                                              $ 26,946
                                                              ========
</TABLE>



(9) RELATED PARTY TRANSACTIONS



     The Company is related to 554257 Alberta Ltd. and Quantum Mechanical Ltd.
by virtue of common control exercised by members of the shareholders' family.
554257 Alberta Ltd. leases the building occupied by the Company as outlined in
note 10. Rent expense is paid to 554257 Alberta Ltd. at commercial rates. The
Company has written off advances to Quantum Mechanical Ltd. in the amount of
$140,806 during the year ended June 30, 1999.



     At June 30, 1999, the Company had a note receivable from Westana Financial
Corporation (Westana) in the amount of $137,287. Westana is a related party in
that an officer at Westana serves as a director of the Company. The note
receivable is due on demand, accrues interest at 18% and is unsecured.



(10) OPERATING LEASES



     The Company operates in premises leased from a related party under a
long-term lease from February 1996 to January 2000. The lease provides for
annual lease payments of $228,000 (CAN$), plus a five-year renewal option to
extend this lease at annual rates to be negotiated.



     In addition, the Company leases various facilities and equipment under
noncancelable operating lease agreements. These leases expire on various dates
through 2003. Future minimum lease payments required under these operating
leases are summarized as follows:



<TABLE>
<CAPTION>
YEAR ENDING JUNE 30,                                            AMOUNT
<S>                                                            <C>
2000........................................................   $173,527
2001........................................................    106,263
2002........................................................     11,577
                                                               --------
          Total minimum lease payments......................   $291,367
                                                               ========
</TABLE>



     Total expense for operating leases for the year ended June 30, 1999, was
$199,095.


                                      F-50
<PAGE>   125

                         PORTA-TEST INTERNATIONAL INC.



                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)



(11) COMPREHENSIVE INCOME (LOSS)



     The accumulated balances for each classification of comprehensive income
     (loss) are as follows at June 30, 1999:



<TABLE>
<CAPTION>
                                                                               ACCUMULATED
                                                   FOREIGN      UNREALIZED        OTHER
                                                  CURRENCY       GAINS ON     COMPREHENSIVE
                                                 TRANSLATION    INVESTMENTS   INCOME (LOSS)
                                                 -----------    -----------   -------------
<S>                                              <C>            <C>           <C>
Beginning balance..............................   $(26,376)       $    --       $(26,376)
Current period change..........................     (6,532)        21,628         15,096
                                                  --------        -------       --------
Ending balance.................................   $(32,908)       $21,628       $(11,280)
                                                  ========        =======       ========
</TABLE>



(12) GEOGRAPHIC INFORMATION



     For the year ended June 30, 1999, the Company had revenues from external
     customers in the following countries:



<TABLE>
<S>                                                            <C>
Mexico......................................................   $4,231,037
United States...............................................    1,845,315
Canada......................................................    1,179,609
                                                               ----------
                                                               $7,255,961
                                                               ==========
</TABLE>



(13) SALE OF COMPANY



     The shareholders of the Company have signed a letter of intent to sell all
     of the issued and outstanding common stock of the Company to NATCO Group,
     Inc. (NATCO) in exchange for cash and notes.


                                      F-51
<PAGE>   126

                          INDEPENDENT AUDITORS' REPORT

The Stockholders
Engineering Specialties, Inc. and
     Engineering Specialties FSC, Inc.:

     We have audited the accompanying combined balance sheet of Engineering
Specialties, Inc. and Engineering Specialties FSC, Inc. (ESI) as of December 31,
1998, and the related combined statements of operations, stockholders' equity
and comprehensive income, and cash flows for the year then ended. These combined
financial statements are the responsibility of ESI's management. Our
responsibility is to express an opinion on these combined financial statements
based on our audit.

     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

     In our opinion, the combined financial statements referred to above present
fairly, in all material respects, the financial position of ESI as of December
31, 1998 and the results of their operations and their cash flows for the year
then ended in conformity with generally accepted accounting principles.


                                            KPMG LLP


New Orleans, Louisiana
September 24, 1999

                                      F-52
<PAGE>   127


                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.


                            COMBINED BALANCE SHEETS


<TABLE>
<CAPTION>
                                                              DECEMBER 31,      JUNE 30,
                                                                  1998            1999
                           ASSETS                             ------------     -----------
                                                                               (UNAUDITED)
<S>                                                           <C>              <C>
Current assets:
  Cash......................................................   $1,043,248         148,857
  Investments...............................................    1,700,205       2,600,068
  Receivables:
     Trade..................................................      741,475         254,203
     Costs and estimated earnings in excess of billings on
       uncompleted contracts................................      139,588         401,138
                                                               ----------       ---------
          Total receivables.................................      881,063         655,341
  Inventories...............................................      190,890         331,353
  Prepaid expenses..........................................       36,561          24,700
                                                               ----------       ---------
          Total current assets..............................    3,851,967       3,760,319
                                                               ----------       ---------
Property and equipment, net.................................      239,569         220,385
Other assets................................................        8,934           8,777
                                                               ----------       ---------
                                                               $4,100,470       3,989,481
                                                               ==========       =========
            LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Billings in excess of costs and estimated earnings on
     uncompleted contracts..................................   $       --          43,185
  Accounts payable..........................................       93,068          22,020
  Accrued expenses..........................................      122,326         153,147
                                                               ----------       ---------
          Total current liabilities.........................      215,394         218,352
                                                               ----------       ---------
Stockholders' equity:
  Common stock..............................................        2,000           2,000
  Additional paid-in capital................................        4,096           4,096
  Retained earnings.........................................    4,653,456       4,546,900
  Accumulated other comprehensive income....................      215,524         208,133
  Treasury stock............................................     (990,000)       (990,000)
                                                               ----------       ---------
          Total stockholders' equity........................    3,885,076       3,771,129
Commitments
                                                               ----------       ---------
                                                               $4,100,470       3,989,481
                                                               ==========       =========
</TABLE>


See accompanying notes to combined financial statements

                                      F-53
<PAGE>   128

                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



                       COMBINED STATEMENTS OF OPERATIONS



<TABLE>
<CAPTION>
                                                                             SIX MONTHS ENDED
                                                             YEAR ENDED          JUNE 30,
                                                            DECEMBER 31,   ---------------------
                                                                1998         1998        1999
                                                            ------------   ---------   ---------
                                                                                (UNAUDITED)
<S>                                                         <C>            <C>         <C>
Revenues..................................................   $3,905,553    1,592,655   1,380,032
Cost of goods sold........................................    1,881,915      895,686     839,951
                                                             ----------    ---------   ---------
          Gross profit....................................    2,023,638      696,969     540,081
                                                             ----------    ---------   ---------
Operating expenses:
  Production expenses.....................................      327,143      121,677     164,901
  Selling expenses........................................      275,866      146,781     151,024
  General and administrative expenses.....................      693,340      330,278     343,275
                                                             ----------    ---------   ---------
                                                              1,296,349      598,736     659,200
                                                             ----------    ---------   ---------
       Operating profit (loss)............................      727,289       98,233    (119,119)
Other income (expense):
  Dividend income.........................................       85,150       48,129      23,825
  Gain (loss) on sale of investments......................      (18,111)          33      83,427
  Other, net..............................................        1,524           --          --
                                                             ----------    ---------   ---------
                                                                 68,563       48,162     107,252
                                                             ----------    ---------   ---------
     Earnings before income taxes.........................      795,852      146,395     (11,867)
Income taxes..............................................        4,986          987          --
                                                             ----------    ---------   ---------
          Net earnings (loss).............................   $  790,866      145,408     (11,867)
                                                             ==========    =========   =========
</TABLE>


See accompanying notes to combined financial statements.

                                      F-54
<PAGE>   129

                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



      COMBINED STATEMENTS OF STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME



<TABLE>
<CAPTION>
                                                                      ACCUMULATED
                                           ADDITIONAL                    OTHER                      TOTAL
                                  COMMON    PAID-IN      RETAINED    COMPREHENSIVE   TREASURY   STOCKHOLDERS'
                                  STOCK     CAPITAL      EARNINGS       INCOME        STOCK        EQUITY
                                  ------   ----------   ----------   -------------   --------   -------------
<S>                               <C>      <C>          <C>          <C>             <C>        <C>
Balances at December 31, 1997...  $2,000     4,096       4,947,908      122,245      (990,000)    4,086,249
Comprehensive income
  Net income....................     --         --         790,866           --            --       790,866
  Net unrealized changes in
     investments................     --         --              --       93,279            --        93,279
                                  ------     -----      ----------      -------      --------    ----------
          Total comprehensive
            income..............     --         --         790,866       93,279            --       884,145
Shareholder distributions.......     --         --      (1,085,318)          --            --    (1,085,318)
                                  ------     -----      ----------      -------      --------    ----------
Balances at December 31, 1998...  2,000      4,096       4,653,456      215,524      (990,000)    3,885,076
Comprehensive income
  Net loss (unaudited)..........     --         --         (11,867)          --            --       (11,867)
  Net unrealized changes in
     investments (unaudited)....     --         --              --       (7,391)           --        (7,391)
                                  ------     -----      ----------      -------      --------    ----------
          Total comprehensive
            income
            (unaudited).........     --         --         (11,867)      (7,391)           --       (19,258)
Shareholder distributions
  (unaudited)...................     --         --         (94,689)          --            --       (94,689)
                                  ------     -----      ----------      -------      --------    ----------
Balances at June 30, 1999
  (unaudited)...................  $2,000     4,096       4,546,900      208,133      (990,000)    3,771,129
                                  ======     =====      ==========      =======      ========    ==========
</TABLE>


See accompanying notes to combined financial statements.

                                      F-55
<PAGE>   130

                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



                       COMBINED STATEMENTS OF CASH FLOWS



<TABLE>
<CAPTION>
                                                                            SIX MONTHS ENDED
                                                            YEAR ENDED          JUNE 30,
                                                           DECEMBER 31,   ---------------------
                                                               1998         1998        1999
                                                           ------------   --------   ----------
                                                                               (UNAUDITED)
<S>                                                        <C>            <C>        <C>
Cash flows from operating activities:
  Net earnings (loss)....................................  $   790,866     145,408      (11,867)
  Adjustments to reconcile net earnings (loss) to net
     cash provided by operating activities:
       Depreciation......................................       65,335      16,560       26,864
       Loss (gain) on sale of investments................       18,111         (33)     (83,427)
       Change in operating assets and liabilities:
          Receivables....................................      207,501    (154,910)     225,722
          Inventories....................................       14,714     (52,799)    (140,463)
          Prepaid expenses...............................      (22,784)      2,695       11,861
          Other assets...................................       (1,177)     (1,146)         157
          Accounts payable...............................      115,981      91,263      (71,048)
          Accrued expenses...............................      (14,881)     24,355      (62,943)
          Billings in excess of cost.....................           --          --       43,185
                                                           -----------    --------   ----------
          Net cash provided by (used in) operating
            activities...................................    1,173,666      71,393      (61,959)
                                                           -----------    --------   ----------
Cash flows from investing activities:
  Proceeds from sale of investments......................    1,200,101      50,050      879,016
  Purchases of investments...............................     (835,150)    (48,129)  (1,702,843)
  Capital expenditures...................................      (39,296)    (21,946)      (7,680)
                                                           -----------    --------   ----------
          Net cash provided by (used in) investing
            activities...................................      325,655     (20,025)    (831,507)
Cash flows from financing activities -- distributions to
  stockholder............................................   (1,085,318)   (680,613)        (925)
                                                           -----------    --------   ----------
          Net increase (decrease) in cash................      414,003    (629,245)    (894,391)
Cash at beginning of period..............................      629,245     629,245    1,043,248
                                                           -----------    --------   ----------
Cash at end of period....................................  $ 1,043,248          --      148,857
                                                           ===========    ========   ==========
Supplemental disclosures of non-cash transactions:
  Change in unrealized gain on investments...............  $    93,279     112,969       (7,391)
                                                           ===========    ========   ==========
  Accrued distributions to stockholder...................  $        --     136,393       93,764
                                                           ===========    ========   ==========
</TABLE>


See accompanying notes to combined financial statements.

                                      F-56
<PAGE>   131


                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



                     NOTES TO COMBINED FINANCIAL STATEMENTS


                               DECEMBER 31, 1998


            (INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS


                   ENDED JUNE 30, 1999 AND 1998 IS UNAUDITED)




 (1) ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

      (A) ORGANIZATION


        The combined financial statements include the accounts of Engineering
        Specialties, Inc. and Engineering Specialties FSC, Inc. (the Company),
        which are affiliated through common ownership. Significant intercompany
        accounts and transactions have been eliminated in combination.



        Engineering Specialties, Inc. (ESI) was organized under the laws of the
        State of Louisiana in 1964, and is located in Covington, Louisiana. ESI
        designs, engineers, manufactures and markets wastewater treating
        equipment for use by the industrial and oilfield wastewater markets. The
        Company serves clients worldwide, providing services and equipment in 24
        countries. Engineering Specialties FSC, Inc. is a foreign sales
        corporation organized in 1995.


      (B) CONCENTRATION OF CREDIT RISK


        Trade receivables from four customers collectively represented 77% and
        individually represented 30%, 21%, 15% and 11% of total trade
        receivables at December 31, 1998. The Company had revenues from two
        customers that collectively represented 31% and individually represented
        20% and 11% of revenues for the year ended December 31, 1998. Export
        sales to Norway and Saudi Arabia represented 12% and 19% of revenues,
        respectively, for the year ended December 31, 1998.


      (C) INVESTMENTS

        Investments consist of shares in mutual funds. The Company classifies
        these investments as available-for-sale, and thus records them at their
        fair value. Unrealized holding gains and losses are excluded from
        earnings and are reported as a separate component of other comprehensive
        income until realized. Realized gains and losses from the sale of the
        investments are determined on a specific identification basis.

        A decline in the market value of an investment below cost that is deemed
        to be other than temporary results in a reduction in carrying amount to
        fair value. The impairment is charged to earnings and a new cost basis
        for the investment is established. Dividend and interest income are
        recognized when earned.

      (D) INVENTORIES

        Inventories are valued at the lower of cost, determined by the first-in,
        first-out method, or market.

      (E) PROPERTY AND EQUIPMENT

        Property and equipment are carried at cost, less an allowance for
        depreciation. Depreciation is computed by accelerated methods over the
        estimated useful lives of the assets. Leasehold improvements are
        amortized using the straight-line method over the shorter of the lease
        term or the estimated useful life of the asset. The carrying values of
        property and equipment are reviewed at least annually or whenever there
        are indications that these assets may be impaired.

                                      F-57
<PAGE>   132

                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1998
            (INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS
                   ENDED JUNE 30, 1999 AND 1998 IS UNAUDITED)



      (F) REVENUE RECOGNITION

        Revenues from significant contracts are recognized on the
        percentage-of-completion method of accounting. Earned revenue is based
        on the percentage that incurred costs to date bear to total estimated
        costs after giving effect to the most recent estimates of total cost.
        The cumulative impact of revisions in total cost estimates during the
        progress of work is reflected in the year in which these changes become
        known. Earned revenue reflects the original contract price, adjusted for
        agreed upon change order revenue, if any. Losses expected to be incurred
        on jobs in progress, after consideration of estimated minimum recoveries
        from change orders, are charged to income as soon as such losses are
        known. Progress billings are included in accounts receivable and are
        considered currently due.

      (G) INCOME TAXES

        Engineering Specialties, Inc. elected under the applicable provision of
        the Internal Revenue Code not to be taxed as a corporation, but to have
        their income taxed to the individual stockholder. Accordingly, no
        provision for Federal and state income taxes with respect to income from
        Engineering Specialties, Inc. has been made in the accompanying combined
        financial statements. Engineering Specialties FSC, Inc., however, is
        taxed as a C-corporation. Gross profits earned on the export sales of
        Engineering Specialties, Inc., net of operating expense allocations, are
        recorded as commission income at Engineering Specialties FSC, Inc. and
        as commission expense by Engineering Specialties, Inc. The commission
        expense is fully deductible by Engineering Specialties, Inc. but a
        portion of the commission income is excludable by Engineering
        Specialties FSC, Inc. under the Internal Revenue Code.

        Income taxes for Engineering Specialties FSC, Inc. are accounted for
        under the asset and liability method. Deferred tax assets and
        liabilities are recognized for the future tax consequences attributable
        to differences between the financial statement carrying amounts of
        existing assets and liabilities and their respective tax bases and
        operating loss and tax credit carryforwards. Deferred tax assets and
        liabilities are measured using enacted tax rates expected to apply to
        taxable income in the years in which those temporary differences are
        expected to be recovered or settled. The effect on deferred tax assets
        and liabilities of a change in tax rates is recognized in income in the
        period that includes the enactment date. For all periods presented,
        there were no differences between the financial statement carrying
        amounts of existing assets and liabilities and their respective tax
        bases.

      (H) USE OF ESTIMATES

        The preparation of financial statements in conformity with generally
        accepted accounting principles requires management to make estimates and
        assumptions that affect the reported amounts of assets and liabilities
        and disclosure of contingent assets and liabilities at the date of the
        combined financial statements and the reported amounts of revenues and
        expenses during the reporting period. Actual results could differ from
        those estimates.

      (I) COMPREHENSIVE INCOME

        On January 1, 1998, the Company adopted SFAS No. 130, Reporting
        Comprehensive Income. SFAS No. 130 establishes standards for reporting
        and presentation of comprehensive income
                                      F-58
<PAGE>   133

                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1998
            (INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS
                   ENDED JUNE 30, 1999 AND 1998 IS UNAUDITED)



        and its components in a full set of financial statements. Comprehensive
        income consists of net income and net unrealized gains (losses) on
        investments and is presented in the statements of stockholders' equity
        and comprehensive income. The Statement requires only additional
        disclosures in the financial statements; it does not affect the
        Company's financial position or results of operations.

      (J) UNAUDITED INTERIM COMBINED FINANCIAL INFORMATION

        In the opinion of management, the accompanying unaudited combined
        financial information of the Company contains all adjustments,
        consisting only of those of a recurring nature, necessary to present
        fairly the Company's combined financial position as of June 30, 1999 and
        the results of its operations and cash flows for the six-months periods
        ended June 30, 1999 and 1998, and the changes in stockholders' equity
        for the six months ended June 30, 1999. These results are not
        necessarily indicative of the results to be expected for the full fiscal
        year.

 (2) INVESTMENTS

     The amortized cost, gross unrealized holding gains, gross unrealized
     holding losses and fair value of available-for-sale investments in mutual
     funds as of December 31, 1998 and June 30, 1999 were as follows:

<TABLE>
<CAPTION>
                                                         GROSS        GROSS
                                                       UNREALIZED   UNREALIZED
                                          AMORTIZED     HOLDING      HOLDING       FAIR
                                             COST        GAINS        LOSSES       VALUE
                                          ----------   ----------   ----------   ---------
<S>                                       <C>          <C>          <C>          <C>
December 31, 1998.......................  $1,484,681    215,524        --        1,700,205
June 30, 1999...........................  $2,391,935    208,133        --        2,600,068
</TABLE>

     Proceeds from the sale of investments were $1,200,101, $50,050 and $879,016
     for the year ended December 31, 1998, and for the six months ended June 30,
     1998 and 1999, respectively. Gross realized gains included in income for
     the same periods were $14,340, $33 and $94,458, respectively. Gross
     unrealized losses included in income for the same periods were $32,451, $0
     and $11,031, respectively.

                                      F-59
<PAGE>   134

                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1998
            (INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS
                   ENDED JUNE 30, 1999 AND 1998 IS UNAUDITED)



 (3) COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS

     Contract costs are summarized as follows:

<TABLE>
<CAPTION>
                                                              DECEMBER 31,   JUNE 30,
                                                                  1998         1999
                                                              ------------   --------
<S>                                                           <C>            <C>
Cumulative expenditures on uncompleted contracts...........     $524,772      412,598
Estimated earnings thereon.................................      285,135      217,447
                                                                --------     --------
                                                                 809,907      630,045
Less billings to date......................................     (670,319)    (272,092)
                                                                --------     --------
                                                                $139,588      357,953
                                                                ========     ========
Included in the combined balance sheets under the following
  captions:
Costs and estimated earnings in excess of..................     $
billings on uncompleted contracts..........................      139,588      401,138
Billings in excess of costs and estimated earnings on
  uncompleted contracts....................................           --      (43,185)
                                                                --------     --------
                                                                $139,588      357,953
                                                                ========     ========
</TABLE>

 (4) INVENTORIES

     Inventories consist of the following amounts:

<TABLE>
<CAPTION>
                                                              DECEMBER 31,   JUNE 30,
                                                                  1998         1999
                                                              ------------   --------
<S>                                                           <C>            <C>
Finished goods..............................................    $ 26,424      92,017
Work-in-progress............................................     164,466     239,336
                                                                --------     -------
                                                                $190,890     331,353
                                                                ========     =======
</TABLE>

 (5) PROPERTY AND EQUIPMENT

     Property and equipment consists of the following:


<TABLE>
<CAPTION>
                                              DECEMBER 31,    JUNE 30,      ESTIMATED
                                                  1998          1999      USEFUL LIVES
                                              ------------   ----------   -------------
<S>                                           <C>            <C>          <C>
Leasehold improvements......................  $   406,181       406,181   15 - 25 years
Buildings...................................      280,614       280,614   31 - 39 years
Automobiles and equipment...................      413,816       415,622      5 years
Furniture and fixtures......................      184,205       190,079    5 - 7 years
                                              -----------    ----------
                                                1,284,816     1,292,496
Less accumulated depreciation...............   (1,045,247)   (1,072,111)
                                              -----------    ----------
                                              $   239,569       220,385
                                              ===========    ==========
</TABLE>


                                      F-60
<PAGE>   135

                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1998
            (INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS
                   ENDED JUNE 30, 1999 AND 1998 IS UNAUDITED)



 (6) STOCKHOLDERS' EQUITY

     A summary of ESI's authorized and issued common stock and additional
     paid-in capital at December 31, 1998 and June 30, 1999 follows:

<TABLE>
<CAPTION>
                                                                ISSUED AND             ADDITIONAL
                                       PAR VALUE   AUTHORIZED   OUTSTANDING   COMMON    PAID-IN
                                       PER SHARE     SHARES       SHARES      STOCK     CAPITAL
                                       ---------   ----------   -----------   ------   ----------
<S>                                    <C>         <C>          <C>           <C>      <C>
Engineering Specialties, Inc.........    $ --         1,000          500      $1,000     $4,096
Engineering Specialties, FSC, Inc....      --        10,000        1,000      1,000          --
</TABLE>

 (7) INCOME TAXES

     All income tax expense in 1998 related to the federal tax expense of
     Engineering Specialties FSC, Inc.

     Actual income tax expense differs from amounts computed by applying the
     U.S. federal corporate income tax rate of 34% to earnings before income
     taxes as a result of the following:

<TABLE>
<S>                                                            <C>
Computed "expected" tax expense.............................   $270,590
Increase (reduction) in income taxes resulting from:
Earnings taxed directly to shareholders.....................   (233,479)
Benefit of FSC..............................................    (24,219)
Effect of graduated rates...................................     (7,906)
                                                               --------
                                                               $  4,986
                                                               ========
</TABLE>

     Cash paid for income taxes in 1998 was approximately $5,000.

 (8) RELATED PARTY TRANSACTIONS

     The Company has a land lease with the stockholder of Engineering
     Specialties, Inc. that required monthly rental payments of $3,000 through
     December 31, 1998. The monthly rental payment increased to $5,000 effective
     January 1, 1999. This lease expires in 2001. Rent expense to the
     stockholder was $36,000 for the year ended December 31, 1998.

     Revenues from contracts between the stockholder of Engineering Specialties,
     Inc. and the Company totaled $23,886 for the year ended December 31, 1998.
     These revenues were recorded as distributions to the stockholder. The
     Company paid $30,000 in professional services to a related party during
     1998.

 (9) COMMITMENTS

     The Company has various outstanding letters of credit totaling
     approximately $140,000 and $155,000, at December 31, 1998 and June 30,
     1999, respectively. These letters of credit are maintained for certain
     customers in accordance with the terms of their contract. The outstanding
     letters of credit have expiration dates ranging from January 1999 through
     October 2000.

                                      F-61
<PAGE>   136

                       ENGINEERING SPECIALTIES, INC. AND


                       ENGINEERING SPECIALTIES FSC, INC.



             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1998
            (INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS
                   ENDED JUNE 30, 1999 AND 1998 IS UNAUDITED)



(10) SUBSEQUENT EVENT

     In August 1999, the stockholder of Engineering Specialties, Inc. purchased
     certain fixed assets from the Company for $50,000. The net book value of
     the assets purchased was $14,000 at December 31, 1998.


     In September 1999, the stockholder of the Company signed a non-binding
     letter of intent to sell all of the issued and outstanding common stock of
     the Company to NATCO Group, Inc. (NATCO) in exchange for cash.


                                      F-62
<PAGE>   137

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION


     The expenses of the offering are estimated to be as follows:


<TABLE>
<S>                                                            <C>
Securities and Exchange Commission registration fee.........   $  24,249
NASD filing fee.............................................       8,720
NYSE listing fee............................................      84,600
Legal fees and expenses.....................................     250,000
Accounting fees and expenses................................     285,000
Blue Sky fees and expenses (including legal fees)...........      10,000
Printing expenses...........................................     100,000
Transfer Agent fees.........................................      15,000
Miscellaneous...............................................      22,431
                                                               ---------
          TOTAL.............................................   $ 800,000
                                                               =========
</TABLE>



ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS



     Under Section 145 of the Delaware General Corporation Law, a Delaware
corporation has the power, under specified circumstances, to indemnify its
directors, officers, employees and agents in connection with threatened, pending
or completed actions, suits or proceedings, whether civil, criminal,
administrative or investigative (other than an action by or in right of the
corporation), brought against them by reason of the fact that they were or are
such directors, officers, employees or agents, against expenses, judgments,
fines and amounts paid in settlement actually and reasonably incurred in any
such action, suit or proceeding. Article Eleventh of the Restated Certificate of
Incorporation of NATCO Group Inc. (the "Company") provides that the Company may
indemnify any director, officer, employee or agent of the Company to the fullest
extent permitted by the Delaware General Corporation Law as the same exists or
may be hereafter amended. Article VI of the Company's Bylaws provides that the
Company shall indemnify each person who is or was made a party to any actual or
threatened civil, criminal, administrative or investigative action, suit or
proceeding because such person is or was an officer or director of the Company
or is a person who is or was serving at the request of the Company as a
director, officer, employee or agent of another corporation or of a partnership,
joint venture, trust or other enterprise, including service relating to employee
benefit plans, to the fullest extent permitted by the Delaware General
Corporation Law as it existed at the time the indemnification provisions of the
Company's Bylaws were adopted or as may be thereafter amended.



     Article VI of the Company's Bylaws also provides that the Company may
maintain insurance, at its own expense, to protect itself and any director,
officer, employee or agent of the Company or of another entity against any
expense, liability, or loss, regardless of whether the Company would have the
power to indemnify such person against such expense, liability or loss under the
Delaware General Corporation Law.



     Section 102(b)(7) of the Delaware General Corporation Law provides that a
certificate of incorporation may contain a provision eliminating or limiting the
personal liability of a director to the corporation or its stockholders for
monetary damages for breach of fiduciary duty as a director, provided that such
provision shall not eliminate or limit the liability of a director (i) for any
breach of the director's duty of loyalty to the corporation or its stockholders,
(ii) for its or omissions not in good faith or which involve intentional
misconduct or a knowing violation of law, (iii) under Section 174 of the
Delaware General Corporation Law (relating to liability for unauthorized
acquisitions or redemptions of, or dividends on, capital stock) or (iv) for any
transaction from which the director derived an improper personal benefit.
Article Tenth of the Company's Certificate of Incorporation contains such a
provision.


                                      II-1
<PAGE>   138


ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES



     On March 5, 1998, the Company effected a four for three split of its common
stock, par value $.01 per share (the "Common Stock"). All references to shares
of Common Stock herein are on a post-split basis.



     On June 30, 1997, the Company issued $2,359,864 in principal amount of its
13% Subordinated Promissory Notes due 2000 and 2,113,334 shares of Common Stock
to Capricorn Investors II, L.P. in consideration of the payment to the Company
of $13,000,000. In so doing, the Company relied on the provisions of Section
4(2) of the Securities Act in claiming exemption for the offering, sale and
delivery of such securities from the registration provisions of the Securities
Act.



     As of June 30, 1998, Capricorn Investors, L.P. and Capricorn Investors II,
L.P. delivered to the Company $5,084,501 and $2,359,864, respectively, in
principal amount of the Company's 13% Subordinated Notes due 2000 in exchange
for the issuance by the Company to such limited partnerships out of authorized
but unissued Common Stock 1,010,333 shares and 468,925 shares, respectively. In
so doing, the Company relied on the provisions of Section 3(a)(9) of the
Securities Act in claiming exemption from the registration provisions of the
Securities Act.



     On November 18, 1998, in connection with the merger of The Cynara Company
("Cynara") with and into the Company, the Company issued 500,000 shares of
Common Stock to the former stockholders of Cynara in partial consideration of
the receipt of all of the outstanding shares of the common stock, par value $.01
per share, of Cynara. In so doing, the Company relied on the provisions of
Section 4(2) of the Securities Act in claiming exemption for the offering, sale
and delivery of such securities from the registration provisions of the
Securities Act.



     On November 18, 1998, the Company issued $5,300,000 in principal amount of
its Convertible Promissory Note due 1999 to Capricorn Investors II, L.P. in
consideration of the payment to the Company of $5,300,000. In so doing, the
Company relied on the provisions of Section 4(2) of the Securities Act in
claiming exemption for the offering, sale and delivery of such securities from
the registration provisions of the Securities Act.



     On December 17, 1998, Capricorn Investors II, L.P. delivered to the Company
$5,300,000 in principal amount of the Company's Convertible Promissory Note due
1999 in exchange for the issuance by the Company to such limited partnership out
of authorized but unissued Common Stock 504,762 shares. In so doing, the Company
relied on the provisions of Section 3(a)(9) of the Securities Act in claiming
exemption from the registration provisions of the Securities Act.



     As of July 12, 1999, the Company issued 136,832 shares of Common Stock to
Nathaniel A. Gregory in consideration of the payment to the Company of
$1,205,489.92. In so doing, the Company relied on the provisions of Section 4(2)
of the Securities Act in claiming exemption for the offering, sale and delivery
of such securities from the registration provisions of the Securities Act.



ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES


     (A) EXHIBITS:


<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
<C>                      <S>
          1.1***         -- Form of Underwriting Agreement.
          2.1**          -- Amended and Restated Agreement and Plan of Merger dated
                            November 17, 1998 but effective March 26, 1998 among the
                            Company, NATCO Acquisition Company, National Tank Company
                            and The Cynara Company.
          2.2*           -- Stock Purchase Agreement dated as of May 7, 1997 among
                            Enterra Petroleum Equipment Group, Inc., National Tank
                            Company and Weatherford Enterra, Inc.
          3.1**          -- Restated Certificate of Incorporation of the Company, as
                            amended by Certificate of Amendment dated November 18,
                            1998.
</TABLE>


                                      II-2
<PAGE>   139


<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
<C>                      <S>
          3.2*           -- Certificate of Designations of Series A Junior
                            Participating Preferred Stock.
          3.3*           -- Amended and Restated Bylaws of the Company.
          4.1*           -- Specimen Common Stock certificate.
          4.2*           -- Rights Agreement dated as of May 15, 1998 by and among
                            the Company and ChaseMellon Shareholder Services, L.L.C.,
                            as Rights Agent.
          4.3**          -- Registration Rights Agreement dated as of November 18,
                            1998 among the Company and Capricorn Investors, L.P. and
                            Capricorn Investors II, L.P.
          4.4**          -- Registration Rights Agreement dated as of November 18,
                            1998 among the Company and the former stockholders of The
                            Cynara Company.
          4.5***         -- Form of lock-up letter to the Underwriters from certain
                            directors and officers of the Company.
          5.1**          -- Opinion of Vinson & Elkins L.L.P.
         10.1*           -- Directors Compensation Plan.
         10.2*           -- Form of Nonemployee Director's Option Agreement.
         10.3*           -- Employee Stock Incentive Plan.
         10.4*           -- International Revolving Loan Agreement dated as of June
                            30, 1997 between National Tank Company and Chase Bank of
                            Texas, N.A.
         10.5*           -- Commitment Letter dated November 24, 1994 from The Bank
                            of Nova Scotia to NATCO Canada, Ltd.
         10.6*           -- Service and Reimbursement Agreement dated as of July 1,
                            1997 between the Company and Capricorn Management, G.P.
         10.7*           -- Term Loan Facility and Revolving Loan Facility dated June
                            30, 1997 among National Tank Company and Chase Bank of
                            Texas, N.A.
         10.8*           -- Loan Agreement dated as of October 8, 1997 between The
                            Cynara Company and Bank One Texas, N.A.
         10.9*           -- Form of Indemnification Agreement between the Company and
                            its officers and directors.
         10.10*          -- Securities Exchange Agreement dated as of March 5, 1998
                            by and among the Company, Capricorn Investors, L.P. and
                            Capricorn Investors II, L.P.
         10.11*          -- Stockholders' Agreement by and among the Company,
                            Capricorn Investors, L.P. and Capricorn Investors II,
                            L.P.
         10.12**         -- Employment Agreement dated as of July 31, 1997 between
                            the Company and Nathaniel A. Gregory, as amended as of
                            July 12, 1999.
         10.13**         -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and Nathaniel A. Gregory, as amended as of
                            July 12, 1999.
         10.14*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and Patrick M. McCarthy.
         10.15*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and William B. Wiener III.
         10.16*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and Frank Smith.
         10.17*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and Frank Smith.
         10.18*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and David Volz.
</TABLE>


                                      II-3
<PAGE>   140


<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
<C>                      <S>
         10.19**         -- Stockholder's Agreement dated as of November 18, 1998
                            among the Company, Capricorn Investors, L.P., Capricorn
                            Investors II, L.P. and the former stockholders of The
                            Cynara Company.
         10.20**         -- Change of Control Policy dated as of September 28, 1999.
         10.21**         -- Severance Pay Summary Plan Description.
         10.22**         -- Loan Agreement ($22,000,000 U.S. Revolving Loan Facility,
                            $10,000,000 Canadian Revolving Loan Facility and
                            $32,500,000 Term Loan Facility) dated as of November 20,
                            1998 among National Tank Company, NATCO Canada, Ltd.,
                            Chase Bank of Texas, National Association, The Bank of
                            Nova Scotia and the other lenders parties thereto and
                            joined in by NATCO Group Inc., as amended.
         10.23**         -- International Revolving Loan Agreement dated as of June
                            30, 1997 between National Tank Company and Texas Commerce
                            Bank, National Association, as amended.
         10.24**         -- Form of Nonstatutory Stock Option Agreement.
         21.1**          -- List of subsidiaries of the Company.
         23.1**          -- Consent of KPMG LLP regarding NATCO Group Inc.
         23.2**          -- Consent of KPMG LLP regarding Engineering Specialties,
                            Inc. and Engineering Specialties FSC, Inc.
         23.3**          -- Consent of KPMG LLP regarding Porta-Test International
                            Inc.
         23.4**          -- Consent of Ernst &Young LLP regarding The Cynara Company.
         23.5**          -- Consent of Vinson & Elkins L.L.P. (contained in Exhibit
                            5.1 hereto).
         24.1**          -- Powers of Attorney (included on the signature page
                            hereto).
         27.1**          -- Financial Data Schedule.
         99.1*           -- Consent of George K. Hickox, Jr. to serve as director.
</TABLE>


- ------------------------------


  * Previously filed.



 ** Filed herewith.



*** To be filed by amendment.



     (b)[CONSOLIDATED FINANCIAL STATEMENT SCHEDULES, YEARS ENDED MARCH 31, 1996,
        1997 AND 1998 AND SIX MONTHS ENDED JUNE 30, 1998 (UNAUDITED) AND 1999
        (UNAUDITED)]


     All other schedules are omitted because the required information is
inapplicable or the information is presented in the Consolidated Financial
Statements or related notes.


ITEM 17. UNDERTAKINGS



     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the Company
pursuant to the foregoing provisions, or otherwise, the Company has been advised
that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses
incurred or paid by a director, officer or controlling person of the Company in
the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Company will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.

                                      II-4
<PAGE>   141


     The undersigned Company hereby undertakes to provide to the underwriters at
the closing specified in the underwriting agreement certificates in such
denominations and registered in such names as required by the underwriters to
permit prompt delivery to each purchaser.



     The undersigned Company hereby undertakes that:



          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the Company pursuant to Rule 424(b)(1) or (4)
     or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.


          (2) For purposes of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.

                                      II-5
<PAGE>   142

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant has duly caused this Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
State of Texas, on the 30th day of September, 1999.


                                            NATCO GROUP INC.


                                            By:  /s/ NATHANIEL A. GREGORY

                                              ----------------------------------
                                                     Nathaniel A. Gregory
                                                 Chief Executive Officer and
                                                            Chairman
                                                  of the Board of Directors


                               POWER OF ATTORNEY



     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Nathaniel A. Gregory and Daniel R. Carter, or
either of them, his true and lawful attorney-in-fact and agent, with full power
of substitution, for him and in his name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments)
to this Registration Statement and any subsequent registration statements filed
by the Registrant pursuant to Rule 462(b) of the Securities Act of 1933, which
relates to this Registration Statement, and to file the same with all exhibits
thereto, and other documents in connection therewith, with the Securities and
Exchange Commission, granting unto said attorney-in-fact and agent full power
and authority to do and perform each and every act and thing requisite and
ratifying and confirming all that said attorney-in-fact and agent or his
substitute or substitutes may lawfully do or cause to be done by virtue hereof.



     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons in
the capacities indicated on the           day of             , 1999.



<TABLE>
<CAPTION>
                  SIGNATURE                                         TITLE
<C>                                             <S>

          /s/ NATHANIEL A. GREGORY              Chairman of the Board and Chief Executive
- ---------------------------------------------     Officer (Principal Executive Officer)
            Nathaniel A. Gregory

            /s/ J. MICHAEL MAYER                Senior Vice President and Chief Financial
- ---------------------------------------------     Officer (Principal Financial Officer)
              J. Michael Mayer

           /s/ STEPHEN J. GOODLAND              Vice President -- Finance and Accounting
- ---------------------------------------------     (Principal Accounting Officer)
             Stephen J. Goodland

         /s/ HERBERT S. WINOKUR, JR.            Director
- ---------------------------------------------
           Herbert S. Winokur, Jr.

             /s/ E. HALE STALEY                 Director
- ---------------------------------------------
               E. Hale Staley

           /s/ PATRICK M. MCCARTHY              Director
- ---------------------------------------------
             Patrick M. McCarthy
</TABLE>


                                      II-6
<PAGE>   143


<TABLE>
<CAPTION>
                  SIGNATURE                                         TITLE
<C>                                             <S>

             /s/ HOWARD I. BULL                 Director
- ---------------------------------------------
               Howard I. Bull

             /s/ KEITH K. ALLAN                 Director
- ---------------------------------------------
               Keith K. Allan

          /s/ GEORGE K. HICKOX, JR.             Director
- ---------------------------------------------
            George K. Hickox, Jr.
</TABLE>


                                      II-7
<PAGE>   144


                               INDEX TO EXHIBITS



<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
<C>                      <S>
          1.1***         -- Form of Underwriting Agreement.
          2.1**          -- Amended and Restated Agreement and Plan of Merger dated
                            November 17, 1998 but effective March 26, 1998 among the
                            Company, NATCO Acquisition Company, National Tank Company
                            and The Cynara Company.
          2.2*           -- Stock Purchase Agreement dated as of May 7, 1997 among
                            Enterra Petroleum Equipment Group, Inc., National Tank
                            Company and Weatherford Enterra, Inc.
          3.1**          -- Restated Certificate of Incorporation of the Company, as
                            amended by Certificate of Amendment dated November 18,
                            1998.
          3.2*           -- Certificate of Designations of Series A Junior
                            Participating Preferred Stock.
          3.3*           -- Amended and Restated Bylaws of the Company.
          4.1*           -- Specimen Common Stock certificate.
          4.2*           -- Rights Agreement dated as of May 15, 1998 by and among
                            the Company and ChaseMellon Shareholder Services, L.L.C.,
                            as Rights Agent.
          4.3**          -- Registration Rights Agreement dated as of November 18,
                            1998 among the Company and Capricorn Investors, L.P. and
                            Capricorn Investors II, L.P.
          4.4**          -- Registration Rights Agreement dated as of November 18,
                            1998 among the Company and the former stockholders of The
                            Cynara Company.
          4.5***         -- Form of lock-up letter to the Underwriters from certain
                            directors and officers of the Company.
          5.1**          -- Opinion of Vinson & Elkins L.L.P.
         10.1*           -- Directors Compensation Plan.
         10.2*           -- Form of Nonemployee Director's Option Agreement.
         10.3*           -- Employee Stock Incentive Plan.
         10.4*           -- International Revolving Loan Agreement dated as of June
                            30, 1997 between National Tank Company and Chase Bank of
                            Texas, N.A.
         10.5*           -- Commitment Letter dated November 24, 1994 from The Bank
                            of Nova Scotia to NATCO Canada, Ltd.
         10.6*           -- Service and Reimbursement Agreement dated as of July 1,
                            1997 between the Company and Capricorn Management, G.P.
         10.7*           -- Term Loan Facility and Revolving Loan Facility dated June
                            30, 1997 among National Tank Company and Chase Bank of
                            Texas, N.A.
         10.8*           -- Loan Agreement dated as of October 8, 1997 between The
                            Cynara Company and Bank One Texas, N.A.
         10.9*           -- Form of Indemnification Agreement between the Company and
                            its officers and directors.
         10.10*          -- Securities Exchange Agreement dated as of March 5, 1998
                            by and among the Company, Capricorn Investors, L.P. and
                            Capricorn Investors II, L.P.
         10.11*          -- Stockholders' Agreement by and among the Company,
                            Capricorn Investors, L.P. and Capricorn Investors II,
                            L.P.
         10.12**         -- Employment Agreement dated as of July 31, 1997 between
                            the Company and Nathaniel A. Gregory, as amended as of
                            July 12, 1999.
         10.13**         -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and Nathaniel A. Gregory, as amended as of
                            July 12, 1999.
</TABLE>

<PAGE>   145


<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
<C>                      <S>
         10.14*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and Patrick M. McCarthy.
         10.15*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and William B. Wiener III.
         10.16*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and Frank Smith.
         10.17*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and Frank Smith.
         10.18*          -- Stock Option Agreement dated as of July 31, 1997 between
                            the Company and David Volz.
         10.19**         -- Stockholder's Agreement dated as of November 18, 1998
                            among the Company, Capricorn Investors, L.P., Capricorn
                            Investors II, L.P. and the former stockholders of The
                            Cynara Company.
         10.20**         -- Change of Control Policy dated as of September 28, 1999.
         10.21**         -- Severance Pay Summary Plan Description
         10.22**         -- Loan Agreement ($22,000,000 U.S. Revolving Loan Facility,
                            $10,000,000 Canadian Revolving Loan Facility and
                            $32,500,000 Term Loan Facility) dated as of November 20,
                            1998 among National Tank Company, NATCO Canada, Ltd.,
                            Chase Bank of Texas, National Association, The Bank of
                            Nova Scotia and the other lenders parties thereto and
                            joined in by NATCO Group Inc., as amended.
         10.23**         -- International Revolving Loan Agreement dated as of June
                            30, 1997 between National Tank Company and Texas Commerce
                            Bank, National Association, as amended.
         10.24**         -- Form of Nonstatutory Stock Option Agreement.
         21.1**          -- List of subsidiaries of the Company.
         23.1**          -- Consents of KPMG LLP regarding NATCO Group Inc.
         23.2**          -- Consent of KPMG LLP regarding Engineering Specialties,
                            Inc. and Engineering Specialties FSC, Inc.
         23.3**          -- Consent of KPMG LLP regarding Porta-Test International
                            Inc.
         23.4**          -- Consent of Ernst &Young LLP regarding The Cynara Company.
         23.5**          -- Consent of Vinson & Elkins L.L.P. (contained in Exhibit
                            5.1 hereto).
         24.1**          -- Powers of Attorney (included on the signature page
                            hereto).
         27.1**          -- Financial Data Schedule.
         99.1*           -- Consent of George K. Hickox, Jr. to serve as director.
</TABLE>


- ------------------------------


  * Previously filed.



 ** Filed herewith.



*** To be filed by amendment.


<PAGE>   1
                                                                     EXHIBIT 2.1

                              AMENDED AND RESTATED

                          AGREEMENT AND PLAN OF MERGER


                                  BY AND AMONG


                               NATCO GROUP INC.,


                           NATCO ACQUISITION COMPANY,


                             NATIONAL TANK COMPANY


                                      AND


                               THE CYNARA COMPANY


                            DATED NOVEMBER 17, 1998


                       BUT EFFECTIVE AS OF MARCH 26, 1998



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                               TABLE OF CONTENTS

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ARTICLE I

         DEFINITIONS

         SECTION 1.01      Definitions............................................................................2
         SECTION 1.02      Rules of Construction..................................................................2

ARTICLE II

         TERMS OF MERGER

         SECTION 2.01      Statutory Merger.......................................................................2
         SECTION 2.02      Effective Time.........................................................................2
         SECTION 2.03      Effect of the Merger...................................................................2
         SECTION 2.04      Certificate of Incorporation; Bylaws...................................................2
         SECTION 2.05      Directors and Officers.................................................................3

ARTICLE III

         CONVERSION OF SECURITIES; EXCHANGE OF CERTIFICATES

         SECTION 3.01      Merger Consideration; Conversion and Cancellation of Securities........................3
         SECTION 3.02      Exchange of Certificates...............................................................7
         SECTION 3.04      Stock Transfer Books...................................................................9

ARTICLE IV

         REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         SECTION 4.01      Organization and Qualification; Subsidiaries..........................................10
         SECTION 4.02      Certificate of Incorporation and Bylaws...............................................10
         SECTION 4.03      Capitalization........................................................................10
         SECTION 4.04      Authorization of Agreement............................................................11
         SECTION 4.05      Approvals.............................................................................11
         SECTION 4.06      No Violation..........................................................................11
         SECTION 4.07      Financial Statements..................................................................12
         SECTION 4.08      No Material Adverse Effect; Conduct...................................................12
         SECTION 4.09      Title to Properties...................................................................13
         SECTION 4.10      Certain Obligations...................................................................13
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                          AGREEMENT AND PLAN OF MERGER


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         SECTION 4.11      Permits; Compliance...................................................................13
         SECTION 4.12      Litigation; Compliance with Laws......................................................13
         SECTION 4.13      Employee Benefit Plans................................................................14
         SECTION 4.14      Taxes.................................................................................17
         SECTION 4.15      Environmental Matters.................................................................17
         SECTION 4.16      Intellectual Property.................................................................18
         SECTION 4.17      Insurance.............................................................................18
         SECTION 4.18      Tax Matters...........................................................................18
         SECTION 4.19      Stockholders..........................................................................19
         SECTION 4.20      Certain Business Practices............................................................19
         SECTION 4.21      Brokers...............................................................................19

ARTICLE V

         REPRESENTATIONS AND WARRANTIES OF ACQUIROR

         SECTION 5.01      Organization and Qualification; Subsidiaries..........................................20
         SECTION 5.02      Certificate of Incorporation and Bylaws...............................................20
         SECTION 5.03      Capitalization........................................................................20
         SECTION 5.05      Approvals.............................................................................22
         SECTION 5.06      No Violation..........................................................................22
         SECTION 5.07      Financial Statements..................................................................23
         SECTION 5.08      No Material Adverse Effect; Conduct...................................................23
         SECTION 5.09      Title to Properties...................................................................23
         SECTION 5.10      Certain Obligations...................................................................24
         SECTION 5.11      Permits; Compliance...................................................................24
         SECTION 5.12      Litigation; Compliance with Laws......................................................24
         SECTION 5.13      Employee Benefit Plans................................................................25
         SECTION 5.14      Taxes.................................................................................28
         SECTION 5.15      Environmental Matters.................................................................28
         SECTION 5.16      Tax Matters...........................................................................29
         SECTION 5.17      Brokers...............................................................................30
         SECTION 5.18      Intellectual Property.................................................................30
         SECTION 5.19      Certain Business Practices............................................................30

ARTICLE VI

         COVENANTS

         SECTION 6.01      Affirmative Covenants.................................................................31
         SECTION 6.02      Negative Covenants....................................................................31
         SECTION 6.03      Access and Information................................................................35
         SECTION 6.04      Confidentiality Agreement.............................................................35
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                          AGREEMENT AND PLAN OF MERGER

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         SECTION 6.05      Stockholders' Letter..................................................................35

ARTICLE VII ADDITIONAL AGREEMENTS

         SECTION 7.01      Meeting of Stockholders...............................................................36
         SECTION 7.02      Appropriate Action; Consents; Filings.................................................36
         SECTION 7.03      Tax Treatment.........................................................................37
         SECTION 7.04      Public Announcements..................................................................37
         SECTION 7.06      Employee Benefit Plans................................................................38
         SECTION 7.07      Indemnification of Directors and Officers.............................................38
         SECTION 7.08      Event Notices.........................................................................39
         SECTION 7.11      The Cynara Name.......................................................................40
         SECTION 7.12      Natco.................................................................................40
         SECTION 7.13      Avoidance of Diminution of Put........................................................41

ARTICLE VIII

         CLOSING CONDITIONS

         SECTION 8.01      Conditions to Obligations of Each Party Under This Agreement..........................41
         SECTION 8.02      Additional Conditions to Obligations of the Acquiror Companies........................42
         SECTION 8.03      Additional Conditions to Obligations of the Company...................................43

ARTICLE IX

         INDEMNIFICATION

         SECTION 9.02      General Indemnification...............................................................44

ARTICLE X

         TERMINATION, AMENDMENT AND WAIVER

         SECTION 10.01     Termination...........................................................................47
         SECTION 10.02     Effect of Termination.................................................................48
         SECTION 10.03     Amendment.............................................................................48
         SECTION 10.04     Waiver................................................................................48
         SECTION 10.05     Fees, Expenses and Other Payments.....................................................49
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ARTICLE XI

         GENERAL PROVISIONS

         SECTION 11.01     Notices...............................................................................49
         SECTION 11.02     Headings..............................................................................50
         SECTION 11.03     Severability..........................................................................50
         SECTION 11.04     Entire Agreement......................................................................51
         SECTION 11.05     Assignment............................................................................51
         SECTION 11.06     Parties in Interest...................................................................51
         SECTION 11.07     Failure or Indulgence Not Waiver; Remedies Cumulative.................................51
         SECTION 11.08     Governing Law.........................................................................51
         SECTION 11.09     Arbitration...........................................................................51
         SECTION 11.10     Counterparts..........................................................................52
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                                    ANNEXES


Annex A           Schedule of Defined Terms
Annex B           Form of Stockholder's Letter
Annex C           Form of Escrow Agreement
Annex D           Form of Charter Amendment
Annex E-1         Form of Registration Rights Agreement - Capricorn
Annex E-2         Form of Registration Rights Agreement - Cynara
Annex F           Form of Stockholders' Agreement
Exhibit I         Calculation Examples



                          AGREEMENT AND PLAN OF MERGER

                                      -iv-

<PAGE>   6

                              AMENDED AND RESTATED
                          AGREEMENT AND PLAN OF MERGER


         THIS AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER, dated
November 17, 1998 but effective as of March 26, 1998 (this "Agreement"), is by
and among NATCO Group Inc., a Delaware corporation ("Acquiror"), National Tank
Company, a Delaware corporation and a direct, wholly-owned subsidiary of
Acquiror ("Natco"), Natco Acquisition Company, a Delaware corporation and a
wholly owned subsidiary of the Acquiror ("Newco"), and The Cynara Company, a
Delaware corporation (the "Company"). The Acquiror and Natco are sometimes
referred to herein as the "Acquiror Companies."

                                   RECITALS:

         The Acquiror, the Company and Newco executed and delivered an
Agreement and Plan of Merger dated March 26, 1998 providing for the merger of
Newco with and into the Company as a result of which the Company would become a
wholly owned subsidiary of the Acquiror.

         The parties to that agreement have determined to amend the agreement
to provide for the merger (the "Merger") of Cynara with and into Natco in lieu
of Newco and to provide for certain other changes therein and, after effecting
such amendments, to restate the agreement.

         The Board of Directors of the Company has determined that the business
combination to be effected by means of the Merger is consistent with and in
furtherance of the long-term business strategy of the Company and is in the
best interests of the Company and its stockholders and has approved and adopted
this Agreement and recommended approval and adoption of this Agreement by the
stockholders of the Company.

         The Board of Directors of the Acquiror has determined that the
business combination to be effected by means of the Merger is consistent with
and in furtherance of the long-term business strategy of the Acquiror and is
fair to, and in the best interests of, the Acquiror and its stockholders and
has approved and adopted this Agreement.

         Upon the terms and subject to the conditions of this Agreement and in
accordance with the Corporate Statute, the Company will merge with and into
Natco and Natco will be the Surviving Corporation.

         For federal income tax purposes, it is intended that the Merger will
qualify as a reorganization within the meaning of the provisions of Section
368(a) of the Code.

         NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth in this
Agreement, the parties hereto agree as follows:



<PAGE>   7

                                   ARTICLE I

                                  DEFINITIONS

         SECTION 1.01 Definitions. Certain capitalized and other terms used in
this Agreement are defined in Annex A hereto and are used herein with the
meanings ascribed to them therein.

         SECTION 1.02 Rules of Construction. Unless the context otherwise
requires, as used in this Agreement: (a) a term has the meaning ascribed to it;
(b) an accounting term not otherwise defined has the meaning ascribed to it in
accordance with GAAP; (c) "including" means "including without limitation;" (d)
words in the singular include the plural; (e) words in the plural include the
singular; (f) words applicable to one gender shall be construed to apply to
each gender; (g) the terms "hereof," "herein," "hereby," "hereto" and
derivative or similar words refer to this entire Agreement; and (h) the terms
"Article" or "Section" shall refer to the specified Article or Section of this
Agreement.

                                   ARTICLE II

                                TERMS OF MERGER

         SECTION 2.01 Statutory Merger. Subject to the terms and conditions and
in reliance upon the representations, warranties, covenants and agreements
contained herein, the Company shall merge with and into Natco at the Effective
Time. The terms and conditions of the Merger and the mode of carrying the same
into effect shall be as set forth in this Agreement. As a result of the Merger,
the separate corporate existence of the Company shall cease and Natco shall
continue as the Surviving Corporation.

         SECTION 2.02 Effective Time. At the conclusion of the Closing on the
Closing Date, the parties hereto shall cause the Merger to be consummated by
filing a Certificate of Merger with the Secretary of State of the State of
Delaware, in such form as required by, and executed in accordance with the
relevant provisions of, the Corporate Statute.

         SECTION 2.03 Effect of the Merger. At the Effective Time, the effect
of the Merger shall be as provided in the applicable provisions of the
Corporate Statute. Without limiting the generality of the foregoing, and
subject thereto, at the Effective Time, except as otherwise provided herein,
all the property, rights, privileges, powers and franchises of Natco and the
Company shall vest in the Surviving Corporation, and all debts, liabilities and
duties of Natco and the Company shall become the debts, liabilities and duties
of the Surviving Corporation.

         SECTION 2.04 Certificate of Incorporation; Bylaws. At the Effective
Time, the certificate of incorporation and the bylaws of Natco, as in effect
immediately prior to the Effective Time, shall be the certificate of
incorporation and the bylaws of the Surviving Corporation, except that the
certificate of incorporation and bylaws of Natco shall contain provisions
substantially similar


                          AGREEMENT AND PLAN OF MERGER

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<PAGE>   8

in form and substance to the indemnification provisions contained in Article
Ten of the certificate of incorporation and Article VI of the bylaws of the
Company, respectively.

         SECTION 2.05 Directors and Officers. The directors of Natco
immediately prior to the Effective Time shall be the directors of the Surviving
Corporation, each to hold office in accordance with the certificate of
incorporation and bylaws of the Surviving Corporation, and the officers of the
Company immediately prior to the Effective Time shall be the officers of the
Surviving Corporation, in each case until their respective successors are duly
elected or appointed and qualified.

                                  ARTICLE III

               CONVERSION OF SECURITIES; EXCHANGE OF CERTIFICATES

         SECTION 3.01 Merger Consideration; Conversion and Cancellation of
Securities. On the date on which the Effective Time occurs, by virtue of the
Merger and without any action on the part of the Acquiror Companies, the
Company or the holders of any of the following securities:

                  (a) Conversion Ratio. Subject to the other provisions of this
         Article III and to the provisions of Section 7.10, each share of
         Company Common Stock issued and outstanding immediately prior to the
         Effective Time (excluding any Company Common Stock described in
         Subsection 3.01(e)) shall be converted into 18.525 shares of Acquiror
         Class B Common Stock, the right to receive $102.38 in cash, the right
         to receive the CTOC Earnout Shares, if any (which right shall in no
         event entitle the holder and any permitted assignees to more than
         2.730 shares of Acquiror Class B Common Stock per share of Company
         Common Stock) and the right to receive the Initial Earnout Shares and
         the Supplemental Earnout Shares, if any (which right shall in no event
         entitle the holder and any permitted assignees to more than 15.795
         shares of Acquiror Class B Common Stock per share of Company Common
         Stock plus such portion of the 2.730 shares of Acquiror Class B Common
         Stock per share of Company Common Stock as were not received as CTOC
         Earnout Shares). The right to receive the CTOC Earnout Shares and the
         right to receive the Initial Earnout Shares and the Supplemental
         Earnout Shares shall not be assignable except by operation of Law, by
         death pursuant to a will or the Laws of descent and distribution, by
         transfer to a member of the immediate family of the Designated Company
         Stockholder or a trust for the benefit of any such family member, by
         transfer to another Designated Company Stockholder, by transfer to a
         commercial bank or other lending institution in accordance with the
         terms of a bona fide pledge or, in the case of a Designated Company
         Stockholder that is a legal entity, by such entity to an affiliate or
         successor of such entity or to the purchaser of all or substantially
         all of that entities assets, all of which exceptions shall be
         permitted if the transferor or transferee shall give notice of such
         assignment, together with such information as may be reasonably
         necessary to evidence qualification of the transferee to be an
         assignee thereof, to the Acquiror and the transferee shall have
         executed the Stockholders' Agreement. The Acquiror shall issue any
         CTOC Earnout Shares on the CTOC Payout Date, any Initial Earnout
         Shares on the Initial Payout Date and any Supplemental Earnout Shares
         on the


                          AGREEMENT AND PLAN OF MERGER

                                      -3-

<PAGE>   9


         Supplemental Payout Date. Notwithstanding the foregoing, (i) if
         between the date of this Agreement and the Effective Time the
         outstanding shares of common stock, par value $0.001 per share, of the
         Acquiror as constituted prior to the effectuation of the Charter
         Amendment or the Acquiror Class A Common Stock shall have been changed
         into a different number of shares or a different class by reason of
         any stock dividend, subdivision, reclassification, recapitalization,
         split, combination or exchange of shares (a "Share Adjustment"), the
         Merger Consideration Per Share of Company Common Stock shall be
         correspondingly adjusted to reflect such Share Adjustment and (ii), if
         between the Effective Time and the Supplemental Payout Date the
         outstanding shares of Acquiror Class B Common Stock shall be subject
         to a Share Adjustment, the numbers of CTOC Earnout Shares, Initial
         Earnout Shares and Supplemental Earnout Shares payable with respect to
         a share of Company Common Stock outstanding immediately prior to the
         Effective Time shall, to the extent the record date for such Share
         Adjustment shall have occurred, or the Share Adjustment shall
         otherwise have become effective, prior to the CTOC Payout Date, the
         Initial Payout Date or the Supplemental Payout Date, as appropriate,
         be correspondingly adjusted to reflect such Share Adjustment. Upon
         exercise of the Warrants issued by the Company from and after the
         Effective Time in accordance with their terms, the Acquiror will issue
         the Merger Consideration Per Share of Company Common Stock for each
         share of Company Common Stock as to which the Warrants are exercised.

                  (b) Earnout Determinations. With respect to determinations
         relating to CTOC Earnout Shares, the aggregate amount of revenues, if
         any, billed in the ordinary course of business by the Surviving
         Corporation to the CTOC Project through September 30, 1999 ("Billed
         Revenues") shall be determined by the Acquiror as of September 30,
         1999 no later than October 31, 1999. With respect to determinations
         relating to Initial Earnout Shares, the Sales Revenue derived or to be
         derived from all Awarded Project Contracts that shall have an award
         date on or prior to March 31, 2000 shall be determined by the Acquiror
         as of March 31, 2000 no later than April 30, 2000. With respect to
         determinations relating to Supplemental Earnout Shares, the Sales
         Revenue derived or to be derived from all Awarded Project Contracts
         that shall have an award date after March 31, 2000 but on or prior to
         December 31, 2000 shall be determined by the Acquiror as of December
         31, 2000 no later than January 31, 2001.

                  (c) No Return Obligation. Notwithstanding the provisions of
         subsections (a) and (b) of this Section 3.01, no Designated Company
         Stockholder shall have any obligation to return any shares of Acquiror
         Class B Common Stock by reason of the fact that the calculation of the
         number of Initial Earnout Shares or Supplemental Earnout Shares shall
         result in a negative number.

                  (d) Cancellation of Converted Shares. All shares of Company
         Common Stock shall at the Effective Time, upon conversion thereof into
         shares of Acquiror Class B Common Stock and the right to receive cash,
         cease to be outstanding and shall without further action be canceled
         and retired, and each certificate previously evidencing Company Common
         Stock outstanding immediately prior to the Effective Time (other than
         Company



                          AGREEMENT AND PLAN OF MERGER

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<PAGE>   10

         Common Stock described in Subsection 3.01(e)) shall thereafter be
         deemed, for all purposes other than the payment of dividends or
         distributions, to represent that number of shares of Acquiror Class B
         Common Stock and the right to receive cash determined pursuant to
         Section 3.01(a) and, if applicable, the right to receive cash pursuant
         to Subsection 3.02(e). The holders of certificates previously
         evidencing Company Common Stock shall cease to have any rights with
         respect to such Company Common Stock except as otherwise provided
         herein or by law.

                  (e) Treasury Stock. Notwithstanding any provision of this
         Agreement to the contrary, each share of Company Common Stock held in
         the treasury of the Company and each share of Company Common Stock, if
         any, owned by the Acquiror or any direct or indirect wholly owned
         Subsidiary of the Acquiror or of the Company immediately prior to the
         Effective Time shall be canceled and extinguished without conversion
         thereof.

                  (f) Natco Stock. Each share of common stock, par value $1.00
         per share, of Natco issued and outstanding immediately prior to the
         Effective Time shall be converted into one share of common stock, par
         value $1.00 per share, of the Surviving Corporation.

                  (g) Review of Earnout Determinations. The Acquiror shall
         deliver its determinations of Billed Revenues to the first sentence of
         subsection (b) of this Section and of Sales Revenue pursuant to the
         second and third sentences of subsection (b) of this Section at least
         twenty (20) days prior to the CTOC Payout Date, the Initial Payout
         Date and the Supplemental Payout Date, respectively, to the
         Representative (as hereinafter defined) and shall provide the
         Representative with a reasonably detailed calculation of Billed
         Revenues or Sales Revenue together with any supporting backup
         reasonably requested by the Representative. If the Representative
         shall have any objections to the determination of such Billed Revenues
         or either determination of Sales Revenue, the Representative shall so
         notify the Acquiror and the Acquiror and the Representative shall
         endeavor in good faith to resolve their differences (the
         "Differences") prior to the related payout date. Any Differences not
         so resolved shall be deferred until the Supplemental Payout Date. If
         the parties are unable to resolve their Differences, the
         Representative shall have until the Supplemental Payout Date to notify
         the Acquiror that the Representative intends to apply for arbitration
         of the Differences pursuant to Section 11.09. If Differences exist as
         to the determination of Billed Revenues for the CTOC Earnout Shares or
         the Sales Revenue for the Initial Earnout Shares or the Supplemental
         Earnout Shares, the Acquiror shall deliver the CTOC Earnout Shares,
         the Initial Earnout Shares and the Supplemental Earnout Shares on the
         CTOC Payout Date, the Initial Payout Date and the Supplemental Payout
         Date, respectively, less in each case the numbers of shares of
         Acquiror Class B Common Stock attributable to the Differences. Any
         additional shares of Acquiror Class B Common Stock attributable to the
         Differences shall be delivered by the Acquiror upon resolution of all
         such Differences, whether by arbitration or otherwise.

                  (h) Acquiror's Successor. If (i) the Acquiror shall merge
         with one or more other corporations or legal entities (whether or not
         the Acquiror shall be the corporation surviving


                          AGREEMENT AND PLAN OF MERGER

                                      -5-

<PAGE>   11

         such merger) and the outstanding Acquiror Class B Common Stock shall
         be converted into another class of capital stock or into other
         securities of the surviving corporation or into cash or other
         property, (ii) the Acquiror shall consolidate with one or more other
         corporations or legal entities, (iii) the Acquiror shall sell all or
         substantially all its assets in a single transaction or a series of
         related transactions and distribute the proceeds thereof to its
         stockholders, the rights under this Section 3.01 of the former holders
         of Company Common Stock to receive CTOC Earnout Shares, Initial
         Earnout Share and Supplemental Earnout Shares shall become, at the
         effective time of any such transaction, rights to receive, in lieu of
         shares of Acquiror Class B Common Stock, the number and class of
         shares of capital stock or other securities or cash or other property
         to which such holders would have been entitled pursuant to the terms
         of such transaction if, immediately prior thereto, such holders had
         been the holders of record of the number of shares of Acquiror Class B
         Common Stock to which such holders would have been entitled as CTOC
         Earnout Shares, Initial Earnout Shares and Supplemental Earnout Shares
         pursuant to this Section 3.01 but for such transaction. If the
         consideration to be received by the former holders of Company Common
         Stock is converted into a right to receive shares of capital stock of
         any other issuer and if between the Effective Time and the
         Supplemental Payout Date the outstanding shares of such capital stock
         shall become subject to a Share Adjustment, the numbers of shares of
         such capital stock or other securities payable hereunder in lieu of
         CTOC Earnout Shares, Initial Earnout Shares and Supplemental Earnout
         Shares shall, to the extent the record date for such Share Adjustment
         shall have occurred, or the Share Adjustment shall otherwise have
         become effective, prior to the CTOC Payout Date, the Initial Payout
         Date or the Supplemental Payout Date, as appropriate, be
         correspondingly adjusted to reflect such Share Adjustment. The parties
         hereto intend, through this subsection 3.01(h) and the last sentence
         of subsection 3.01(a), to provide a mechanism by which the Designated
         Company Stockholders, to the extent that they are entitled to any CTOC
         Earnout Shares, Initial Earnout Shares or Supplemental Earnout Shares
         pursuant to the provisions of this Agreement, will receive on the
         applicable payout dates the correct numbers of shares of Acquiror
         Class B Common Stock or shares of any other capital stock of Acquiror
         or any other issuer of the type and amount that would have been
         received by a Designated Company Stockholder (or its assignee) if such
         stockholder (or its assignee) had been issued such CTOC Earnout
         Shares, Initial Earnout Shares or Supplemental Earnout Shares at the
         Effective Time. The Acquiror, on behalf of itself, its successors and
         assigns, hereby agrees to reserve for issuance all shares of capital
         stock in any way required to be issued to the Designated Company
         Stockholders pursuant to the provisions of this Agreement and agrees
         to adjust equitably the consideration to be received by the Designated
         Company Stockholders as CTOC Earnout Shares, Initial Earnout Shares
         and Supplemental Earnout Shares if necessary to give effect to the
         intent of the parties hereto expressed in the preceeding sentence.

                  (i) Examples. Attached hereto as Exhibit I are examples
         prepared to demonstrate the application of this Section 3.01, Section
         7.10 and the applicable definitions, to reflect the distribution of
         the Escrow Shares, the CTOC Earnout Shares, the Initial Earnout Shares
         and the Supplemental Earnout Shares to the Designated Company
         Stockholders.


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                                      -6-

<PAGE>   12

         SECTION 3.02 Exchange of Certificates.

                  (a) Exchange Fund. At or immediately prior to the Effective
         Time, the Acquiror shall segregate, and hold separate and apart from
         its general funds, for the benefit of the former holders of Company
         Common Stock as of the Effective Time and for exchange in accordance
         with this Article III, certificates evidencing a number of shares of
         Acquiror Class B Common Stock and an amount of cash equal to the
         product of the Merger Consideration Per Share of Company Common Stock
         (other than the right to receive the Earnout Shares) and the number of
         shares of Company Common Stock outstanding immediately prior to the
         Effective Time (exclusive of any such shares to be canceled pursuant
         to Subsection 3.01(e)), together with any cash to be paid pursuant to
         Section 3.02(e). The Acquiror shall deliver Acquiror Class B Common
         Stock, together with any cash to be paid in lieu of fractional
         interests in shares of Acquiror Class B Common Stock pursuant to
         Subsection 3.02(e) and any dividends or distributions to be paid
         pursuant to Subsection 3.02(d), in exchange for certificates
         theretofore evidencing Company Common Stock surrendered to the
         Acquiror pursuant to Subsection 3.02(c). Except as contemplated by
         Subsection 3.02(e), the Exchange Fund shall not be used for any other
         purpose.

                  (b) Letter of Transmittal. The Acquiror will at the request
         of any Designated Company Stockholder provide to the Designated
         Company Stockholder within 10 days of such request a letter of
         transmittal and other appropriate materials for use in surrendering to
         the Acquiror certificates that prior to the Effective Time evidenced
         shares of Company Common Stock. To the extent that the Designated
         Company Stockholders do not make any such request prior to the
         Effective Time, the Acquiror will send, within two Business Days after
         the Effective Time, to each record holder of Company Common Stock
         immediately prior to the Effective Time a letter of transmittal and
         other appropriate materials for use in surrendering to the Acquiror
         certificates that prior to the Effective Time evidenced shares of
         Company Common Stock. Such letter of transmittal shall include a Form
         W-9 prescribed by the Regulations under the Code.

                  (c) Exchange Procedures. Promptly after the Effective Time,
         the Acquiror shall distribute to each former holder of Company Common
         Stock, upon surrender to the Acquiror for cancellation of one or more
         certificates that theretofore evidenced shares of Company Common
         Stock, certificates evidencing the appropriate number of shares of
         Acquiror Class B Common Stock and cash into which such shares of
         Company Common Stock were converted pursuant to the Merger, together
         with any cash to be paid in lieu of fractional interests in shares of
         Acquiror Class B Common Stock pursuant to Subsection 3.02(e) and any
         dividends or distributions to be paid pursuant to Subsection 3.02(d).
         If shares of Acquiror Class B Common Stock are to be issued to a
         Person other than the Person in whose name the surrendered certificate
         or certificates are registered, it shall be a condition of issuance of
         the Acquiror Class B Common Stock that (i) the surrendered certificate
         or certificates shall be properly endorsed, with signatures guaranteed
         or otherwise in proper form for transfer, and that the Person
         requesting such payment shall pay any transfer or other taxes required
         by reason of the issuance of Acquiror Class B Common Stock to a Person


                          AGREEMENT AND PLAN OF MERGER

                                      -7-

<PAGE>   13




         other than the registered holder of the surrendered certificate or
         certificates or (ii) such Person shall establish to the satisfaction
         of the Acquiror that such tax has been paid or is not applicable.
         Notwithstanding the foregoing, neither the Acquiror nor any other
         party hereto shall be liable to any former holder of Company Common
         Stock for any Acquiror Class B Common Stock or cash into which such
         Company Common Stock shall have been converted pursuant to the Merger,
         cash in lieu of fractional share interests or dividends or
         distributions thereon required to be delivered to a public official
         pursuant to any applicable escheat law in accordance with an opinion
         of counsel to such effect.

                  (d) Distributions with Respect to Unexchanged Shares of
         Company Common Stock. No dividends or other distributions declared or
         made with respect to Acquiror Class B Common Stock with a record date
         after the Effective Time shall be paid to the holder of any
         certificate that theretofore evidenced shares of Company Common Stock
         until the holder of such certificate shall surrender such certificate.
         Subject to the effect of any applicable escheat laws, following
         surrender of any such certificate, there shall be paid (i) to the
         holder of the certificates evidencing whole shares of Acquiror Class B
         Common Stock issued in exchange therefor, without interest, (A)
         promptly, the amount of dividends or other distributions with a record
         date after the Effective Time theretofore paid with respect to such
         whole shares of Acquiror Class B Common Stock and (B), at the
         appropriate payment date, the amount of dividends or other
         distributions, with a record date after the Effective Time but prior
         to surrender and a payment date occurring after surrender, payable
         with respect to such whole shares of Acquiror Class B Common Stock and
         (ii) to the holder of any certificate that theretofore evidenced
         shares of Company Common Stock, without interest, promptly the amount
         of any cash payable with respect to a fractional share of Acquiror
         Class B Common Stock to which such holder is entitled pursuant to
         Subsection 3.02(e).

                  (e) No Fractional Shares. Notwithstanding anything herein to
         the contrary, no certificates or scrip evidencing fractional shares of
         Acquiror Class B Common Stock shall be issued in connection with the
         Merger, and any such fractional share interests to which a holder of
         record of Company Common Stock at the Effective Time would otherwise
         be entitled will not entitle such holder to vote or to any rights of a
         stockholder of the Acquiror. In lieu of any such fractional shares,
         each holder of record of Company Common Stock at the Effective Time
         who but for the provisions of this Subsection 3.02(e) would be
         entitled to receive a fractional interest of a share of Acquiror Class
         B Common Stock pursuant to the Merger shall be paid cash, without any
         interest thereon, in an amount equal to $13.00 multiplied by such
         fraction. The Acquiror shall promptly deposit the aggregate amount of
         cash so required as part of the Exchange Fund. Thereafter, the
         Acquiror shall, in accordance with Subsection 3.02(d), pay to the
         Persons who would otherwise be entitled to receive a fractional
         interest of a share of Acquiror Class B Common Stock an amount in cash
         determined as provided above.

                  (f) Termination of Exchange Fund. Any portion of the Exchange
         Fund which remains unclaimed by the former holders of Company Common
         Stock for twelve months after the Effective Time may be returned to
         the general funds of the Acquiror, and any former


                          AGREEMENT AND PLAN OF MERGER

                                      -8-

<PAGE>   14




         holders of Company Common Stock who shall not have theretofore
         complied with this Article III shall thereafter look only to the
         Acquiror for the Acquiror Class B Common Stock and any cash to which
         they are entitled.

                  (g) Withholding of Tax. The Acquiror shall be entitled to
         deduct and withhold from the consideration otherwise payable pursuant
         to this Agreement to any former holder of Company Common Stock such
         amounts as the Acquiror (or any affiliate thereof) is required to
         deduct and withhold with respect to the making of such payment under
         the Code or any provision of state, local or foreign tax law. To the
         extent that amounts are so withheld by the Acquiror, such withheld
         amounts shall be treated for all purposes of this Agreement as having
         been paid to the former holder of Company Common Stock in respect of
         which such deduction and withholding was made by the Acquiror. To the
         extent that any former holder of Company Common Stock shall execute
         and return the Form W-9 included in the letter of transmittal, no such
         withholding shall be required or made.

                  (h) Lost Certificates. If any certificate evidencing Company
         Common Stock shall have been lost, stolen or destroyed, upon the
         making of an affidavit of that fact by the Person claiming such
         certificate to be lost, stolen or destroyed and, if required by
         Acquiror, the posting by such Person of a bond, in such reasonable
         amount as Acquiror may direct, as indemnity against claims that may be
         made against it with respect to such certificate, the Acquiror shall
         issue in exchange for such lost, stolen or destroyed certificate the
         Acquiror Class B Common Stock and cash into which such Company Common
         Stock shall have been converted pursuant to the Merger, any cash in
         lieu of fractional shares of Acquiror Class B Common Stock to which
         the holder thereof may be entitled pursuant to Section 3.02(e) and any
         dividends or other distributions to which the holder thereof may be
         entitled pursuant to Subsection 3.02(d).

         SECTION 3.03 Closing. The Closing shall take place at the offices of
Vinson & Elkins L.L.P., 1001 Fannin, 3600 First City Tower, Houston, Texas
77002-6760, at 10:00 a.m. on November 18, 1998 or at such other place and time
as the parties hereto may agree.

         SECTION 3.04 Stock Transfer Books. At the Effective Time, the stock
transfer books of the Company shall be closed and there shall be no further
registration of transfers of shares of Company Common Stock thereafter on the
records of the Company.

                                   ARTICLE IV

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         If and to the extent any information required to be furnished in any
Section of the Company's Disclosure Letter is contained in another Section of
the Company's Disclosure Letter, such information will be deemed to be included
in all Sections of the Company's Disclosure Letter if such disclosure is
reasonably apparent on its face. Subject to the provisions of Section 9.01, the
Company hereby represents and warrants to the Acquiror Companies that:


                          AGREEMENT AND PLAN OF MERGER

                                      -9-

<PAGE>   15

         SECTION 4.01 Organization and Qualification; Subsidiaries. The Company
is a legal entity duly organized, validly existing and in good standing under
the Laws of its jurisdiction of incorporation, has all requisite power and
authority to own, lease and operate its properties and to carry on its business
as it is now being conducted and is duly qualified and in good standing to do
business in each jurisdiction in which the nature of the business conducted by
it or the ownership or leasing of its properties makes such qualification
necessary, other than any matters, including the failure to be so duly
qualified and in good standing, that could not reasonably be expected to have a
Material Adverse Effect on the Company. The Company does not have any
Subsidiaries. Except as disclosed in Section 4.01 of the Company's Disclosure
Letter, the Company does not own an equity interest in any partnership, joint
venture arrangement or other business entity that is Material to the Company.

         SECTION 4.02 Certificate of Incorporation and Bylaws. The Company has
heretofore marked for identification and furnished to the Acquiror complete and
correct copies of its certificate of incorporation and bylaws, in each case as
amended or restated to the date hereof. The Company is not in violation of any
of the provisions of its certificate of incorporation or bylaws.

         SECTION 4.03 Capitalization.

                  (a) Company Common Stock. The authorized capital stock of the
         Company consists solely of (i) 100,000 shares of Company Common Stock
         consisting of 90,000 shares of Class A Common Stock and 10,000 shares
         of Class B Common Stock, of which as of December 31, 1997: (A)
         49,999.99 shares of Class A Common Stock were issued and outstanding,
         (B) no shares of Class B Common Stock were issued and outstanding. All
         the outstanding shares of Class A Common Stock are duly authorized,
         validly issued, fully paid and nonassessable and not subject to
         preemptive rights created by statute, the Company's certificate of
         incorporation or bylaws or any agreement to which the Company is a
         party or is bound other than the Stockholders Agreement dated July 1,
         1996 by and among the Company, BOCP and the stockholders of the
         Company (the "Company Stockholders Agreement"). Except as set forth in
         Subsection 4.03(a) of the Company's Disclosure Letter, between
         December 31, 1997 and the date of this Agreement, no shares of Company
         Common Stock have been issued by the Company and the Company has not
         granted any options for, or other rights to purchase, shares of
         Company Common Stock.

                  (b) Reserved Shares. Except as set forth in Subsection
         4.03(a), no shares of Common Stock are reserved for issuance, and,
         except for the Warrants listed in Subsection 4.03(b) of the Company's
         Disclosure Letter, there are no contracts, agreements, commitments or
         arrangements obligating the Company (i) to offer, sell, issue or grant
         any Equity Securities of the Company, (ii) to redeem, purchase or
         acquire, or to offer to purchase or acquire, any outstanding Equity
         Securities of the Company or (iii) to grant any Lien on any shares of
         capital stock of the Company.

                  (c) Adverse Claims. Except for the Warrants and the Company
         Stockholders Agreement, there are no voting trusts, proxies or other
         agreements, commitments or


                          AGREEMENT AND PLAN OF MERGER

                                      -10-

<PAGE>   16

         understandings of any character to which the Company is a party or by
         which the Company is bound with respect to the voting of any shares of
         capital stock of the Company or with respect to the registration of
         the offering, sale or delivery of any shares of capital stock of the
         Company under the Securities Act.

         SECTION 4.04 Authorization of Agreement. The Company has all requisite
corporate power and authority to execute and deliver this Agreement and each
instrument required hereby to be executed and delivered by it at the Closing,
to perform its obligations hereunder and thereunder and to consummate the
transactions contemplated hereby. The execution and delivery by the Company of
this Agreement and each instrument required hereby to be executed and delivered
by it at the Closing and the performance of its obligations hereunder and
thereunder have been duly and validly authorized by all requisite corporate
action on the part of the Company (other than, with respect to this Agreement,
the approval and adoption of this Agreement by the holders of a majority of the
outstanding shares of Company Common Stock in accordance with the Corporate
Statute). This Agreement has been duly executed and delivered by the Company
and (assuming due authorization, execution and delivery hereof by the other
parties hereto) constitutes a legal, valid and binding obligation of the
Company, enforceable against the Company in accordance with its terms, except
as the same may be limited by legal principles of general applicability
governing the application and availability of equitable remedies.

         SECTION 4.05 Approvals. Except as set forth in Section 4.05 of the
Company's Disclosure Letter and for the applicable requirements, if any, of (a)
the Securities Act, (b) the Exchange Act, (c) state securities or blue sky
laws, (b) the HSR Act, (c) the filing and recordation of appropriate merger
documents as required by the Corporate Statute and (d) those Laws, Regulations
and Orders noncompliance with which could not reasonably be expected to have a
material adverse effect on the ability of the Company to perform its
obligations under this Agreement or to have a Material Adverse Effect on the
Company, no filing or registration with, no waiting period imposed by and no
Permit or Order of, any Governmental Authority is required under any Law,
Regulation or Order applicable to the Company to permit the Company to execute,
deliver or perform this Agreement or any instrument required hereby to be
executed and delivered by it at the Closing.

         SECTION 4.06 No Violation. Assuming effectuation of all filings and
registrations with, termination or expiration of any applicable waiting periods
imposed by and receipt of all Permits and Orders of, Governmental Authorities
indicated as required in Section 4.05 and receipt of the approval of this
Agreement by the stockholders of the Company as required by the Corporate
Statute and the approvals or consents required to be obtained from the other
parties disclosed in Section 4.06 of the Company's Disclosure Letter, neither
the execution and delivery by the Company of this Agreement or any instrument
required hereby to be executed and delivered by it at the Closing nor the
performance by the Company of its obligations hereunder or thereunder will (a)
violate or breach the terms of or cause a default under, or result in the
termination of, or accelerate the performance required by, or result in a right
of termination, cancellation or acceleration of any obligation under, or result
in the creation of any lien, security interest, charge or encumbrance upon any
of the properties or assets of the Company or any of its Subsidiaries under (i)
any Law,


                          AGREEMENT AND PLAN OF MERGER

                                      -11-

<PAGE>   17
Regulation or Order applicable to the Company, (ii) the certificate of
incorporation or bylaws of the Company or (iii) any contract or agreement to
which the Company or any of its Subsidiaries is a party or by which it or any
of its properties or assets is bound, or (b) with the passage of time, the
giving of notice or the taking of any action by a third Person, have any of the
effects set forth in clause (a) of this Section, except in any such case for
any matters described in this Section that could not reasonably be expected to
have a material adverse effect upon the ability of the Company to perform its
obligations under this Agreement or a Material Adverse Effect on the Company.

         SECTION 4.07 Financial Statements.

                  (a) The Company Financial Statements (i) have been prepared
         in accordance with GAAP and (ii) fairly present the consolidated
         financial position of the Company and its Subsidiaries as of the
         respective dates thereof and the consolidated results of their
         operations and cash flows for the periods indicated.

                  (b) Except as set forth in Subsection 4.07(b) of the
         Company's Disclosure Letter, there exist no liabilities or obligations
         of the Company that are Material to the Company, whether accrued,
         absolute, contingent or threatened, that would be required to be
         reflected, reserved for or disclosed under GAAP in financial
         statements of the Company (including the notes thereto) as of and for
         the period ended on the date of this representation and warranty,
         other than (i) liabilities or obligations that are adequately
         reflected, reserved for or disclosed in the Company's Financial
         Statements, (ii) liabilities or obligations incurred in the ordinary
         course of business of the Company since December 31, 1997, (iii)
         liabilities or obligations the incurrence of which is not prohibited
         by Subsection 6.02(a) and (iv) liabilities and obligations that are
         not Material to the Company.

         SECTION 4.08 No Material Adverse Effect; Conduct.

                  (a) Since December 31, 1997, no event (other than any event
         that is of general application to all or a substantial portion of the
         Company's industry and other than any event that is expressly subject
         to any other representation or warranty contained in Article IV) has,
         to the Knowledge of the Company, occurred that, individually or
         together with other similar events, could reasonably be expected to
         constitute or cause a Material Adverse Effect on the Company.

                  (b) Except as disclosed in Subsection 4.08(b) of the
         Company's Disclosure Letter, during the period from December 31, 1997
         to the date of this Agreement, the Company has not engaged in any
         conduct that is proscribed during the period from the date of this
         Agreement to the Effective Time by subsections (i) through (xii) of
         Subsection 6.02(a) or agreed in writing or otherwise during such
         period prior to the date of this Agreement to engage in any such
         conduct.



                          AGREEMENT AND PLAN OF MERGER

                                      -12-


<PAGE>   18

         SECTION 4.09 Title to Properties. The Company has indefeasible title
to all of the properties reflected in the Company's Balance Sheet, other than
any properties reflected in the Company's Balance Sheet that (i) have been sold
or otherwise disposed of since the date of the Company's Balance Sheet in the
ordinary course of business consistent with past practice or (ii) are not,
individually or in the aggregate, Material to the Company, free and clear of
Liens, other than (x) Liens the existence of which is reflected in the
Company's Financial Statements, (y) Permitted Encumbrances and (z) Liens that,
individually or in the aggregate, are not Material to the Company. The Company
holds under valid lease agreements all real and personal properties reflected
in the Company's Balance Sheet as being held under capitalized leases, and all
real and personal property that is subject to the operating leases to which
reference is made in the notes to the Company's Audited Financial Statements,
and enjoy peaceful and undisturbed possession of such properties under such
leases, other than (i) any properties as to which such leases have terminated
in the ordinary course of business without any Material liability of any party
thereto since the date of the Company's Balance Sheet and (ii) any properties
that, individually or in the aggregate, are not Material to the Company. The
Company has not received any written notice of any adverse claim to the title
to any properties owned by it or with respect to any lease under which any
properties are held by it, other than any claims that, individually or in the
aggregate, could not reasonably be expected to have a Material Adverse Effect
on the Company.

         SECTION 4.10 Certain Obligations. Except as set forth in Section 4.10
of the Company's Disclosure Letter, the Company is not a party to or bound by
any Material Contract. Except as set forth in Section 4.10 of the Company's
Disclosure Letter, all Material Contracts to which the Company is a party are
in full force and effect, the Company has performed its obligations thereunder
to date and, to the Knowledge of the Company, each other party thereto has
performed its obligations thereunder to date, other than any failure of a
Material Contract to be in full force and effect or any nonperformance thereof
that could not reasonably be expected to have a Material Adverse Effect on the
Company.

         SECTION 4.11 Permits; Compliance. To the Knowledge of the Company, the
Company has obtained all Permits that are necessary to carry on its business as
currently conducted, except for any such Permits that its failure to possess,
individually or in the aggregate, could not reasonably be expected to have a
Material Adverse Effect on the Company. Such Permits are in full force and
effect, have not been violated in any respect that could reasonably be expected
to have a Material Adverse Effect on the Company and, to the Knowledge of the
Company, no suspension, revocation or cancellation thereof has been threatened
and there is no action, proceeding or investigation pending or threatened
regarding suspension, revocation or cancellation of any of such Permits, except
where the suspension, revocation or cancellation of such Permits could not
reasonably be expected to have a Material Adverse Effect on the Company.

         SECTION 4.12 Litigation; Compliance with Laws. There are no actions,
suits, investigations or proceedings (including any proceedings in arbitration)
pending or, to the Knowledge of the Company, threatened against the Company, at
law or in equity, in any Court or before or by any Governmental Authority,
except actions, suits or proceedings that (a) are set forth in Section 4.12 or
Section 4.15 of the Company's Disclosure Letter or (b), individually or, with


                          AGREEMENT AND PLAN OF MERGER

                                      -13-

<PAGE>   19




respect to multiple actions, suits or proceedings that allege similar theories
of recovery based on similar facts, in the aggregate, could not reasonably be
expected to have a Material Adverse Effect on the Company. There are no claims
pending or, to the Knowledge of the Company, threatened by any Persons against
the Company for indemnification pursuant to any statute, organizational
document, contract or otherwise with respect to any action, suit, investigation
or proceeding pending or previously determined in any Court or before or by any
Governmental Authority. Except as set forth in Section 4.12 of the Company's
Disclosure Letter, the Company is in substantial compliance with all applicable
Laws and Regulations and is not in default with respect to any Order applicable
to the Company, except such events of noncompliance or defaults that,
individually or in the aggregate, could not reasonably be expected to have a
Material Adverse Effect on the Company.

         SECTION 4.13 Employee Benefit Plans.

                  (a) Listing. Each Benefit Plan of the Company is listed in
         Subsection 4.13(a) of the Company's Disclosure Letter, including, with
         respect to Terminated Benefit Plans, the date of termination. True and
         correct copies of each of the following have been made available to
         the Acquiror: (i) the most recent annual report (Form 5500) relating
         to each such Current Benefit Plan filed with the IRS, (ii) the plan
         document for each such Current Benefit Plan, (iii) the trust
         agreement, if any, relating to each such Current Benefit Plan, (iv)
         the most recent summary plan description for each such Current Benefit
         Plan for which a summary plan description is required by ERISA, (v)
         the most recent actuarial report or valuation relating to each such
         Current Benefit Plan subject to Title IV of ERISA and (vi) the most
         recent determination letter, if any, issued by the IRS with respect to
         any such Current Benefit Plan intended to be qualified under Section
         401 of the Code.

                  (b) Liability Related to Plans. No event has occurred and, to
         the Knowledge of the Company, there exists no condition or set of
         circumstances in connection with which the Company could be subject to
         any liability under the terms of such Benefit Plans, or with respect
         to any such Benefit Plans, under ERISA, the Code or any other
         applicable Law, other than any event, condition or set of
         circumstances that could not reasonably be expected to have a Material
         Adverse Effect on the Company.

                  (c) Qualified Status. Each Current Benefit Plan intended to
         be qualified under Code Section 401 (i) satisfies in form the
         requirements of such Section, (ii) is a standardized prototype which
         does not require an individual favorable determination letter from the
         IRS, (iii) has not, since adoption of the prototype, been amended and
         (iv) has not been operated in a way that would adversely affect its
         qualified status.

                  (d) No Termination of Current Plans. There has been no
         termination or partial termination of any such Current Benefit Plan
         within the meaning of Section 411(d)(3) of the Code. The Company
         intends to terminate its Management Incentive Plan (the "MIP") as of
         or immediately prior to the Closing and to pay any accrued amounts to
         employees of the Company entitled to participate in the MIP as of the
         termination date.


                          AGREEMENT AND PLAN OF MERGER

                                      -14-

<PAGE>   20

                  (e) Terminated Plans. Any such Terminated Benefit Plan
         intended to have been qualified under Section 401 of the Code received
         a favorable determination letter from the IRS with respect to its
         termination.

                  (f) No Claims. There are no actions, suits or claims pending
         (other than routine claims for benefits) or, to the Knowledge of the
         Company, threatened against, or with respect to, any of such Benefit
         Plans or their assets that could reasonably be expected to have a
         Material Adverse Effect on the Company.

                  (g) Pending Matters. To the Knowledge of the Company, there
         is no matter pending (other than routine qualification determination
         filings) with respect to any of such Benefit Plans before the IRS, the
         Department of Labor, the PBGC or any other Governmental Authority.

                  (h) Required Contributions. All contributions required to be
         made by the Company or the Company's Subsidiaries to such Benefit
         Plans pursuant to their terms and provisions have been made timely.

                  (i) No ERISA Violations. As to any such Current Benefit Plan
         subject to Title IV of ERISA, (i) there has been no event or condition
         that presents a material risk of plan termination, (ii) no accumulated
         funding deficiency, whether or not waived, within the meaning of
         Section 302 of ERISA or Section 412 of the Code has been incurred
         within six years prior to date of this Agreement, (iii) no reportable
         event within the meaning of Section 4043 of ERISA (for which the
         disclosure requirements of Regulation section 2615.3 promulgated by
         the PBGC have not been waived) has occurred within six years prior to
         the date of this Agreement, (iv) no notice of intent to terminate such
         Benefit Plan has been given under Section 4041 of ERISA, (v) no
         proceeding has been instituted under Section 4042 of ERISA to
         terminate such Benefit Plan, (vi) no liability to the PBGC has been
         incurred (other than with respect to required premium payments) and
         (vii) the assets of the Benefit Plan equal or exceed the actuarial
         present value of the benefit liabilities, within the meaning of
         Section 4041 of ERISA, under the Benefit Plan, based upon reasonable
         actuarial assumptions and the asset valuation principles established
         by the PBGC.

                  (j) Nondeductible Payments. Except as set forth in Subsection
         4.13(j) of the Company's Disclosure Letter, in connection with the
         consummation of the transactions contemplated by this Agreement, no
         payment of money or other property, acceleration of benefits or
         provision of other rights has been or will be made under any such
         Current Benefit Plans or any of the programs, agreements, policies or
         other arrangements described in Subsection 4.13(l) of the Company's
         Disclosure Letter that would be reasonably likely to be nondeductible
         under Section 280G of the Code, whether or not some other subsequent
         action or event would be required to cause such payment, acceleration
         or provision to be triggered.

                  (k) No Required Increases. Except as set forth in Subsection
         4.13(k) of the Company's Disclosure Letter, the execution and delivery
         of this Agreement and the


                          AGREEMENT AND PLAN OF MERGER

                                      -15-

<PAGE>   21

         consummation of the transactions contemplated hereby will not (i)
         require the Company to make a larger contribution to, or pay greater
         benefits or provide other rights under, any Current Benefit Plan or
         any of the programs, agreements, policies or other arrangements
         described in Subsection 4.13(l) of the Company's Disclosure Letter
         than it otherwise would, whether or not some other subsequent action
         or event would be required to cause such payment or provision to be
         triggered or (ii) create or give rise to any additional vested rights
         or service credits under any Current Benefit Plan or any of such
         programs, agreements, policies or other arrangements, whether or not
         some other subsequent action or event would be required to cause such
         creation or acceleration to be triggered.

                  (l) Severance and Employment Agreements. Except as set forth
         in Subsection 4.13(l) of the Company's Disclosure Letter, the Company
         is not a party to nor is it bound by any severance agreement
         (involving $50,000 or more), program or policy. True and correct
         copies of all employment agreements with officers of the Company and
         all vacation, overtime and other compensation policies of the Company
         relating to its employees have been made available to the Acquiror.

                  (m) Retiree Benefits. Except as set forth in Subsection
         4.13(m) of the Company's Disclosure Letter, no Benefit Plan provides
         retiree medical or retiree life insurance benefits to any Person and
         the Company is not contractually or otherwise obligated (whether or
         not in writing) to provide any Person with life insurance or medical
         benefits upon retirement or termination of employment, other than as
         required by the provisions of Sections 601 through 608 of ERISA and
         Section 4980B of the Code. Each Benefit Plan or other arrangement
         described in Subsection 4.13(m) of the Company's Disclosure Letter may
         be unilaterally amended or terminated in its entirety without
         liability except as to benefits accrued thereunder prior to such
         amendment or termination.

                  (n) Multiemployer Plans. The Company does not contribute or
         have any obligation to contribute, and has not within six years prior
         to the date of this Agreement contributed or had an obligation to
         contribute, to a multiemployer plan within the meaning of Section
         3(37) of ERISA.

                  (o) Vacation Policies. Except as set forth in Subsection
         4.13(o) of the Company's Disclosure Letter, the vacation policies of
         the Company do not provide for carryover vacation from one calendar
         year to the next.

                  (p) Collective Bargaining Agreements. No collective
         bargaining agreement to which the Company is a party is currently in
         effect or is being negotiated by the Company. There is no pending or,
         to the Knowledge of the Company, threatened labor dispute, strike or
         work stoppage against the Company that could reasonably be expected to
         have a Material Adverse Effect on the Company. To the Knowledge of the
         Company, neither the Company nor any representative or employee of the
         Company has in the United States committed any unfair labor practices
         in connection with the operation of the business of the Company, and
         there is no pending or, to the Knowledge of the Company, threatened
         charge or complaint


                          AGREEMENT AND PLAN OF MERGER

                                      -16-

<PAGE>   22

         against the Company by the National Labor Relations Board or any
         comparable agency of any state of the United States.

         SECTION 4.14 Taxes.

                  (a) Tax Returns and Taxes. Except for such matters as could
         not reasonably be expected to have a Material Adverse Effect on the
         Company, (i) all Tax Returns that are required to be filed by or with
         respect to the Company on or before the Effective Time have been or
         will be timely filed, (ii) all Taxes payable by the Company with
         respect to the income, operations, business or capital of the Company
         on or before the Effective Time have been or will be timely paid in
         full, (iii) all withholding Tax requirements imposed on or with
         respect to the Company have been or will be satisfied in full in all
         respects and (iv) no penalty, interest or other charge is or will
         become due with respect to the late filing of any such Tax Return or
         late payment of any such Tax.

                  (b) Audits. Except as set forth in Subsection 4.14(b) of the
         Company's Disclosure Letter, all Tax Returns have been audited by the
         applicable Governmental Authority or the applicable statute of
         limitations has expired for the period covered by such Tax Returns.

                  (c) Extensions of Times. Except as set forth in Subsection
         4.14(c) of the Company's Disclosure Letter, there is not in force any
         extension of time with respect to the due date for the filing of any
         Tax Return or any waiver or agreement for any extension of time for
         the assessment or payment of any Tax due with respect to the period
         covered by any Tax Return.

                  (d) Claims. There is no claim against or with respect to the
         income, operations, business or capital of the Company for any Taxes,
         and no assessment, deficiency or adjustment has been asserted or
         proposed with respect to any Tax Return, that, in either case, could
         reasonably be expected to have a Material Adverse Effect on the
         Company.

                  (e) Affiliated Group. Except as set forth in Subsection
         4.14(e) of the Company's Disclosure Letter, the Company has not,
         during the last ten years, been a member of an affiliated group filing
         a consolidated federal income Tax Return.

         SECTION 4.15 Environmental Matters. Except for matters disclosed in
Section 4.15 of the Company's Disclosure Letter and except for matters that,
individually or in the aggregate, could not reasonably be expected to have a
Material Adverse Effect on the Company, (a) the properties, operations and
activities of the Company are in compliance with all applicable Environmental
Laws; (b) the Company and the properties and operations of the Company are not
subject to any existing, pending or, to the Knowledge of the Company,
threatened action, suit, investigation, inquiry or proceeding by or before any
Court or Governmental Authority under any Environmental Law; (c) all Permits,
if any, required to be obtained or filed by the Company under any Environmental
Law in connection with the business of the Company have been obtained or filed


                          AGREEMENT AND PLAN OF MERGER

                                      -17-

<PAGE>   23


and are valid and currently in full force and effect; (d) there has been no
release of any hazardous substance, pollutant or contaminant into the
environment by the Company or in connection with its properties or operations;
(e) there has been no exposure (attributable to the action of the Company) of
any Person or property to any hazardous substance, pollutant or contaminant in
connection with the properties, operations and activities of the Company; and
(f) the Company has made available to the Acquiror all internal and external
environmental audits and studies and all correspondence on substantial
environmental matters (in each case relevant to the Company) in the possession
of the Company.

         SECTION 4.16 Intellectual Property. Other than as disclosed in Section
4.16 of the Company's Disclosure Letter, the Company owns or holds licenses
under or otherwise has the right to use or sublicense, all foreign and domestic
patents, trademarks (common law and registered), trademark registration
applications, service marks (common law and registered), service mark
registration applications, trade names and copyrights, copyright applications,
trade secrets, know-how and other proprietary information as are necessary for
the conduct of the business of the Company as currently conducted except for
any such intellectual property as to which the failure to own or hold licenses
could not reasonably be expected to have a Material Adverse Effect on the
Company. Other than as disclosed in Section 4.16 of the Company's Disclosure
Letter, the Company is not currently in receipt of any notice of infringement
or notice of conflict with the asserted rights of others in any patents,
trademarks, service marks, trade names, trade secrets and copyrights owned or
held by other Persons, except, in each case, for matters that could not
reasonably be expected to have a Material Adverse Effect on the Company.
Neither the execution and delivery of this Agreement nor consummation of the
transactions contemplated hereby will violate or breach the terms or cause any
cancellation of any Material license held by the Company under any patent,
trademark, service mark, trade name, trade secret or copyright.

         SECTION 4.17 Insurance. Section 4.17 of the Company's Disclosure
Letter sets forth a list, including the name of the underwriter, the risks
insured, coverage and related limits and deductibles, expiration dates and
significant riders, of the principal insurance policies currently maintained by
the Company. To the Knowledge of the Company, all such policies are in full
force and effect and all premiums due thereon have been paid.

         SECTION 4.18 Tax Matters. The Company has not taken or agreed to take
any action that would prevent the Merger from constituting a reorganization
within the meaning of section 368(a) of the Code. Specifically:

                  (a) Preservation of Proprietary Interest. Prior to and in
         connection with the Merger, (x) none of the Company Common Stock will
         be redeemed, (y) no extraordinary distribution will be made with
         respect to the Company Common Stock and (z) none of the Company Common
         Stock will be acquired by any Person related (as the term "related" is
         defined in Treas. Reg. Section 1.368-1(e)(3) without regard to Section
         1.368-1(e)(3)(i)(A)) to the Company.


                          AGREEMENT AND PLAN OF MERGER

                                      -18-


<PAGE>   24

                  (b) Expenses. The Company and the stockholders of the Company
         will each pay their respective expenses, if any, incurred in
         connection with the Merger.

                  (c) Intercorporate Indebtedness. There is no intercorporate
         indebtedness existing between the Company and the Acquiror or between
         the Company and Natco that was issued, acquired, or will be settled at
         a discount.

                  (d) Investment Company. The Company is not an investment
         company as defined in section 368(a)(2)(F)(iii) and (iv) of the Code.

                  (e) Bankruptcy. The Company is not under the jurisdiction of
         a court in a title 11 or similar case within the meaning of section
         368(a)(3)(A) of the Code.

         SECTION 4.19 Stockholders. Section 4.19 of the Company's Disclosure
Letter contains a true and complete list of all Persons who as of the date
hereof own shares of Company Common Stock of record or, to the Knowledge of the
Company, beneficially.

         SECTION 4.20 Certain Business Practices. To the Company's Knowledge,
as of the date of this Agreement, neither the Company nor any director,
officer, employee or agent of the Company has (i) used any funds for unlawful
contributions, gifts, entertainment or other unlawful payments relating to
political activity, (ii) made any unlawful payment to any foreign or domestic
government official or employee or to any foreign or domestic political party
or campaign or violated any provision of the Foreign Corrupt Practices Act of
1977, as amended, (iii) consummated any transaction, made any payment, entered
into any agreement or arrangement or taken any other action in violation of
Section 1128B(b) of the Social Security Act, as amended, or (iv) made any other
unlawful payment, except for any such matters that could not reasonably be
expected to have a Material Adverse Effect on the Company.

         SECTION 4.21 Brokers. Except as set forth in Section 4.21 of the
Company's Disclosure Letter, no broker, finder or investment banker is entitled
to any brokerage, finder's or other fee or commission in connection with the
transactions contemplated by this Agreement based upon arrangements made by or
on behalf of the Company.

                                   ARTICLE V

                   REPRESENTATIONS AND WARRANTIES OF ACQUIROR

         If and to the extent any information required to be furnished in any
Section of the Acquiror's Disclosure Letter is contained in another Section of
the Acquiror's Disclosure Letter, such information will be deemed to be
included in all Sections of the Acquiror's Disclosure Letter if such disclosure
is reasonably apparent on its face. Subject to the provisions of Section 9.01,
the Acquiror Companies hereby represent and warrant to the Company that:


                          AGREEMENT AND PLAN OF MERGER

                                      -19-


<PAGE>   25

         SECTION 5.01 Organization and Qualification; Subsidiaries. The
Acquiror, Natco and each other Subsidiary of the Acquiror are legal entities
duly organized, validly existing and in good standing under the laws of their
respective jurisdictions of incorporation or organization, have all requisite
power and authority to own, lease and operate their respective properties and
to carry on their business as it is now being conducted and are duly qualified
and in good standing to do business in each jurisdiction in which the nature of
the business conducted by them or the ownership or leasing of their respective
properties makes such qualification necessary, other than any matters,
including the failure to be so duly qualified and in good standing, that could
not reasonably be expected to have a Material Adverse Effect on the Acquiror.
Section 5.01 of the Acquiror's Disclosure Letter sets forth, as of the date of
this Agreement, a true and complete list of all Significant Subsidiaries of the
Acquiror, together with the jurisdiction of incorporation of each such
Subsidiary and the percentage of each such Subsidiary's outstanding capital
stock or other equity interests owned by the Acquiror or another Subsidiary of
the Acquiror. Except for investments in Subsidiaries, neither the Acquiror,
Natco nor any of the Acquiror's other Subsidiaries owns an equity interest in
any partnership or joint venture arrangement or other business entity that is
Material to the Acquiror.

         SECTION 5.02 Certificate of Incorporation and Bylaws. The Acquiror has
heretofore marked for identification and furnished to the Company complete and
correct copies of the certificate of incorporation and the bylaws or the
equivalent organizational documents, in each case as amended or restated to the
date hereof, of the Acquiror and each of its Significant Subsidiaries. None of
the Acquiror, Natco or any of the Acquiror's Significant Subsidiaries is in
violation of any of the provisions of its certificate of incorporation or
bylaws (or equivalent organizational documents).

         SECTION 5.03 Capitalization.

                  (a) As of the date of this Agreement, the authorized capital
         stock of the Acquiror consists of 50,000,000 shares of Common Stock,
         of which 8,145,925 shares are, as of such date, issued and outstanding
         and owned beneficially and of record by the Stockholders, free and
         clear of all Liens, and 5,000,000 shares of Preferred Stock, without
         par value, of which 200,000 shares have been designated as the Series
         A Junior Participating Preferred Stock and of which none is issued or
         outstanding. As of the date hereof, no other shares of capital stock
         of the Acquiror are issued or outstanding. Section 5.03(a) of the
         Acquiror's Disclosure Letter sets forth the Persons who own the
         Acquiror Common Stock of record and beneficially as of the date
         hereof, including the number of shares owned by each, and the pro
         forma ownership of the Acquiror Common Stock after giving effect to
         the consummation of the Investment Agreement and the Merger. The
         Acquiror has heretofore delivered to the Company a true and correct
         copy of the Investment Agreement.

                  (b) Each outstanding share of Common Stock has been duly
         authorized, validly issued and is fully paid and nonassessable. No
         shares of Common Stock were issued in violation of any preemptive
         rights created by statute, the Acquiror's certificate of incorporation
         or bylaws or any agreement as to which the Acquiror is a party or
         bound. Except for 504,762 shares of Class A Common Stock to be issued
         pursuant to the Investment


                          AGREEMENT AND PLAN OF MERGER

                                      -20-

<PAGE>   26

         Agreement, the shares of Class B Common Stock to be issued pursuant to
         this Agreement and the shares of Common Stock to be issued (as Class A
         Common Stock) pursuant to the Acquiror Stock Options listed in
         Subsection 5.03(b) of the Acquiror's Disclosure Letter and except as
         otherwise set forth in Subsection 5.03(b) of the Disclosure Letter, no
         shares of Common Stock or other capital stock of the Acquiror were
         reserved for issuance and, except for the Investment Agreement, this
         Agreement, and the Acquiror Stock Options listed in Subsection 5.03(b)
         of the Acquiror's Disclosure Letter and the other agreements listed in
         Subsection 5.03(b) of the Acquiror's Disclosure Letter, there are no
         contracts, agreements, commitments or arrangements obligating the
         Acquiror (i) to offer, sell, issue or grant any Equity Securities of
         the Acquiror, (ii) to redeem, purchase or acquire, or offer to
         purchase or acquire, any outstanding Equity Securities of the Acquiror
         or (iii) to grant any Lien on any shares of capital stock of the
         Acquiror.

                  (c) The authorized capital stock of each Significant
         Subsidiary of the Acquiror is as set forth in Subsection 5.03(c) of
         the Acquiror's Disclosure Letter. Except as set forth in Subsection
         5.03(c) of the Acquiror's Disclosure Letter, (i) all the issued and
         outstanding shares of capital stock of, or other equity interests in,
         each Significant Subsidiary of the Acquiror are owned by the Acquiror
         or one of its Subsidiaries, have been duly authorized and are validly
         issued, and, with respect to capital stock, are fully paid and
         nonassessable, and were not issued in violation of any preemptive or
         similar rights of any Person; (ii) all such issued and outstanding
         shares, or other equity interests, that are owned by the Acquiror or
         one of its Subsidiaries are owned free and clear of all Liens; (iii)
         no shares of capital stock of, or other equity interests in, any
         Significant Subsidiary of the Acquiror are reserved for issuance, and
         there are no contracts, agreements, commitments or arrangements
         obligating the Acquiror or any of its Subsidiaries (A) to offer, sell,
         issue, grant, pledge, dispose of or encumber any Equity Securities of
         any of the Significant Subsidiaries of the Acquiror or (B) to redeem,
         purchase or acquire, or offer to purchase or acquire, any outstanding
         Equity Securities of any of the Significant Subsidiaries of the
         Acquiror or (C) to grant any Lien on any outstanding Equity Securities
         of any of the Significant Subsidiaries of the Acquiror; and (iv) all
         the outstanding shares of capital stock of Natco are owned directly by
         the Acquiror; except for any matter under clause (i), (ii) or (iii) of
         this Subsection 5.03(c) that could not reasonably be expected to have
         a Material Adverse Effect on the Acquiror.

                  (d) Except as set forth in Section 5.03(d) of the Acquiror's
         Disclosure Letter, there are no voting trusts, proxies or other
         agreements, commitments or understandings of any character to which
         the Acquiror or any of its Subsidiaries is a party or by which the
         Acquiror or any of its Subsidiaries is bound with respect to the
         voting of any shares of capital stock of the Acquiror or any of its
         Subsidiaries or with respect to the registration of the offering, sale
         or delivery of any shares of capital stock of the Acquiror or any of
         its Subsidiaries, except in the case of any Subsidiaries of the
         Acquiror that are not Significant Subsidiaries for any matters that
         could not reasonably be expected to have a Material Adverse Effect on
         the Acquiror.


                          AGREEMENT AND PLAN OF MERGER

                                      -21-


<PAGE>   27

         SECTION 5.04 Authorization of Agreement. Each of the Acquiror and
Natco has all requisite corporate power and authority to execute and deliver
this Agreement and each instrument required hereby to be executed and delivered
by it at the Closing, to perform its obligations hereunder and thereunder and
to consummate the transactions contemplated hereby. The execution and delivery
by the Acquiror and Natco of this Agreement and each instrument required hereby
to be executed and delivered by the Acquiror or Natco at the Closing and the
performance of their respective obligations hereunder and thereunder have been
duly and validly authorized by all requisite corporate action (including
stockholder action) on the part of the Acquiror and Natco, respectively. This
Agreement has been duly executed and delivered by the Acquiror and Natco and
(assuming due authorization, execution and delivery hereof by the other party
hereto) constitutes a legal, valid and binding obligation of the Acquiror and
Natco, enforceable against the Acquiror and Natco in accordance with its terms,
except as the same may be limited by legal principles of general applicability
governing the application and availability of equitable remedies.

         SECTION 5.05 Approvals. Except for the applicable requirements, if
any, of (a) the Securities Act, (b) the Exchange Act, (c) state securities or
blue sky laws, (d) the HSR Act, (e) the filing and recordation of appropriate
merger documents as required by the Corporate Statute and (f) those Laws,
Regulations and Orders noncompliance with which could not reasonably be
expected to have a material adverse effect on the ability of the Acquiror or
Natco to perform its obligations under this Agreement or to have a Material
Adverse Effect on the Acquiror, no filing or registration with, no waiting
period imposed by and no Permit or Order of, any Governmental Authority is
required under any Law, Regulation or Order applicable to the Acquiror or Natco
to permit the Acquiror or Natco to execute, deliver or perform this Agreement
or any instrument required hereby to be executed and delivered by it at the
Closing.

         SECTION 5.06 No Violation. Assuming effectuation of all filings and
registrations with, termination or expiration of any applicable waiting periods
imposed by and receipt of all Permits and Orders of, Governmental Authorities
indicated as required in Section 5.05, neither the execution and delivery by
the Acquiror or Natco of this Agreement or any instrument required hereby to be
executed and delivered by the Acquiror or Natco at the Closing nor the
performance by the Acquiror or Natco of its respective obligations hereunder or
thereunder will (a) violate or breach the terms of or cause a default under or
result in the termination, cancellation or acceleration of any obligation
under, or result in the creation of any Lien upon any of the properties or
assets of the Acquiror or any of its Subsidiaries under (i) any Law, Regulation
or Order applicable to the Acquiror or Natco, (ii) the certificate of
incorporation or bylaws of the Acquiror or Natco or (iii) any contract or
agreement to which the Acquiror or any of its Subsidiaries is a party or by
which it or any of its properties or assets is bound, or (b) with the passage
of time, the giving of notice or the taking of any action by a third Person,
have any of the effects set forth in clause (a) of this Section, except in any
such case for any matters described in this Section that could not reasonably
be expected to have a material adverse effect upon the ability of the Acquiror
or Natco to perform its obligations under this Agreement or a Material Adverse
Effect on the Acquiror.


                          AGREEMENT AND PLAN OF MERGER

                                      -22-


<PAGE>   28

         SECTION 5.07 Financial Statements.

                  (a) The Acquiror's Consolidated Financial Statements (i) have
         been prepared in accordance with GAAP and (ii) fairly present the
         consolidated financial position of the Acquiror and its Subsidiaries
         as of the respective dates thereof and the consolidated results of
         their operations and cash flows for the periods indicated (including,
         in the case of any unaudited interim financial statements, reasonable
         estimates of normal and recurring year-end adjustments).

                  (b) Except as set forth in Subsection 5.07(b) of the
         Acquiror's Disclosure Letter, there exist no liabilities or
         obligations of the Acquiror and its Subsidiaries that are Material to
         the Acquiror, whether accrued, absolute, contingent or threatened,
         that would be required to be reflected, reserved for or disclosed
         under GAAP in consolidated financial statements of the Acquiror as of
         and for the period ended on the date of this representation and
         warranty, other than (i) liabilities or obligations that are
         adequately reflected, reserved for or disclosed in the Acquiror's
         Consolidated Financial Statements, (ii) liabilities or obligations
         incurred in the ordinary course of business of the Acquiror and its
         Subsidiaries since December 31, 1997, (iii) liabilities or obligations
         the incurrence of which is not prohibited by Subsection 6.02(b) and
         (iv) liabilities or obligations that are not Material to the Acquiror.

         SECTION 5.08 No Material Adverse Effect; Conduct.

                  (a) Since December 31, 1997, no event (other than any event
         that is of general application to all or a substantial portion of the
         Acquiror's industry and other than any event that is expressly subject
         to any other representation or warranty contained in Article V) has,
         to the Knowledge of the Acquiror, occurred that, individually or
         together with other similar events, could reasonably be expected to
         constitute or cause a Material Adverse Effect on the Acquiror.

                  (b) Except as disclosed in the Acquiror's Disclosure Letter,
         during the period from September 30, 1997 to the date of this
         Agreement, neither the Acquiror nor any of its Subsidiaries has
         engaged in any conduct that is proscribed during the period from the
         date of this Agreement to the Effective Time by clauses (i) through
         (viii) of Subsection 6.02(b) or agreed in writing or otherwise during
         such period prior to the date of this Agreement to engage in any such
         conduct.

         SECTION 5.09 Title to Properties. The Acquiror or its Subsidiaries,
individually or together, have indefeasible title to all of the properties
reflected in the Acquiror's Consolidated Balance Sheet, other than any
properties reflected in the Acquiror's Consolidated Balance Sheet that (a) have
been sold or otherwise disposed of since the date of the Acquiror's
Consolidated Balance Sheet in the ordinary course of business consistent with
past practice or (b) are not, individually or in the aggregate, Material to the
Acquiror, free and clear of Liens, other than (i) Liens the existence of which
is reflected in the Acquiror's Consolidated Financial Statements, (ii)
Permitted Encumbrances and (iii) Liens that, individually or in the aggregate,
are not Material to the Acquiror.

                          AGREEMENT AND PLAN OF MERGER

                                      -23-


<PAGE>   29

The Acquiror or its Subsidiaries, individually or together, hold under valid
lease agreements all real and personal properties reflected in the Acquiror's
Consolidated Balance Sheet as being held under capitalized leases, and all real
and personal property that is subject to the operating leases to which
reference is made in the notes to the Acquiror's Audited Consolidated Financial
Statements, and enjoy peaceful and undisturbed possession of such properties
under such leases, other than (x) any properties as to which such leases have
terminated in the ordinary course of business without any Material liability of
any party thereto since the date of the Acquiror's Consolidated Balance Sheet
and (y) any properties that, individually or in the aggregate, are not Material
to the Acquiror. Neither the Acquiror nor any of its Subsidiaries has received
any written notice of any adverse claim to the title to any properties owned by
them or with respect to any lease under which any properties are held by them,
other than any claims that, individually or in the aggregate, could not
reasonably be expected to have a Material Adverse Effect on the Acquiror.

         SECTION 5.10 Certain Obligations. Except as set forth in Section 5.10
of the Acquiror's Disclosure Letter, neither the Acquiror nor any of its
Subsidiaries is a party to or bound by any Material Contract. Except as set
forth in Section 5.10 of the Acquiror's Disclosure Letter, all Material
Contracts to which the Acquiror or any of its Subsidiaries is a party are in
full force and effect, the Acquiror or the Subsidiary of the Acquiror that is a
party to or bound by each such Material Contract has performed its obligations
thereunder to date and, to the Knowledge of the Acquiror, each other party
thereto has performed its obligations thereunder to date, other than any
failure of any such Material Contract to be in full force and effect or any
nonperformance thereof that could not reasonably be expected to have a Material
Adverse Effect on the Acquiror.

         SECTION 5.11 Permits; Compliance. To the Knowledge of the Acquiror,
the Acquiror and its Subsidiaries have obtained all Permits that are necessary
to carry on their businesses as currently conducted, except for any such
Permits that the failure to possess, individually or in the aggregate, could
not reasonably be expected to have a Material Adverse Effect on the Acquiror.
Such Permits are in full force and effect, have not been violated in any
respect that could reasonably be expected to have a Material Adverse Effect on
the Acquiror and, to the Knowledge of the Acquiror, no suspension, revocation
or cancellation thereof has been threatened and there is no action, proceeding
or investigation pending or threatened regarding suspension, revocation or
cancellation of any of such Permits, except where the suspension, revocation or
cancellation of such Permits could not reasonably be expected to have a
Material Adverse Effect on the Acquiror.

         SECTION 5.12 Litigation; Compliance with Laws. There are no actions,
suits, investigations or proceedings (including any proceedings in arbitration)
pending or, to the Knowledge of the Acquiror, threatened against the Acquiror
or any of its Subsidiaries, at law or in equity, in any Court or before or by
any Governmental Authority, except actions, suits or proceedings that (a) are
set forth in Section 5.12 or Section 5.15 of the Acquiror's Disclosure Letter
or (b), individually or, with respect to multiple actions, suits or proceedings
that allege similar theories of recovery based on similar facts, in the
aggregate, could not reasonably be expected to have a Material Adverse Effect
on the Acquiror. There are no claims pending or, to the Knowledge of the
Acquiror, threatened by any Persons against the Acquiror or any of its
Subsidiaries for indemnification pursuant to any statute, organizational
document, contract or otherwise with respect to any action,

                          AGREEMENT AND PLAN OF MERGER

                                      -24-

<PAGE>   30

suit, investigation or proceeding pending or previously determined in any Court
or before or by any Governmental Authority. The Acquiror and its Subsidiaries
are in substantial compliance with all applicable Laws and Regulations and are
not in default with respect to any Order applicable to the Acquiror or any of
its Subsidiaries, except such events of noncompliance or defaults that,
individually or in the aggregate, could not reasonably be expected to have a
Material Adverse Effect on the Acquiror.

         SECTION 5.13 Employee Benefit Plans.

                  (a) Listing. Each Benefit Plan of the Acquiror and its
         Subsidiaries is listed in Subsection 5.13(a) of the Acquiror's
         Disclosure Letter, including, with respect to Terminated Benefit
         Plans, the date of termination. True and correct copies of each of the
         following have been made available to the Company: (i) the most recent
         annual report (Form 5500) relating to each such Current Benefit Plan
         filed with the IRS, (ii) the plan document for each such Current
         Benefit Plan, (iii) the trust agreement, if any, relating to each such
         Current Benefit Plan, (iv) the most recent summary plan description
         for each such Current Benefit Plan for which a summary plan
         description is required by ERISA, (v) the most recent actuarial report
         or valuation relating to each such Current Benefit Plan subject to
         Title IV of ERISA and (vi) the most recent determination letter, if
         any, issued by the IRS with respect to any such Current Benefit Plan
         intended to be qualified under Section 401 of the Code.

                  (b) Liability Related to Plans. No event has occurred and, to
         the Knowledge of the Acquiror, there exists no condition or set of
         circumstances in connection with which the Acquiror or any of its
         Subsidiaries could be subject to any liability under the terms of any
         Benefit Plans of the Acquiror or any of its Subsidiaries or, with
         respect to any such Benefit Plan, under ERISA, the Code or any other
         applicable Law, other than any condition or set of circumstances that
         could not reasonably be expected to have a Material Adverse Effect on
         the Acquiror.

                  (c) Qualified Status. Each Current Benefit Plan intended to
         be qualified under Code Section 401 (i) satisfies in form the
         requirements of such Section, (ii) has received a favorable
         determination letter from the IRS regarding such qualified status,
         (iii) except as set forth in Section 5.13(c)(iii) of the Acquiror's
         Disclosure Letter, has not, since receipt of the most recent favorable
         determination letter, been amended and (iv) has not been operated in a
         way that would adversely affect its qualified status.

                  (d) No Termination of Current Plans. There has been no
         termination or partial termination of any such Current Benefit Plan
         within the meaning of Section 411(d)(3) of the Code.

                  (e) Terminated Plans. Any such Terminated Benefit Plan
         intended to have been qualified under Section 401 of the Code received
         a favorable determination letter from the IRS with respect to its
         termination.


                          AGREEMENT AND PLAN OF MERGER

                                      -25-

<PAGE>   31

                  (f) No Claims. There are no actions, suits or claims pending
         (other than routine claims for benefits) or, to the Knowledge of the
         Acquiror, threatened against, or with respect to, any of such Benefit
         Plans or their assets that could reasonably be expected to have a
         Material Adverse Effect on the Acquiror.

                  (g) Pending Matters. To the Knowledge of the Acquiror, there
         is no matter pending (other than routine qualification determination
         filings) with respect to any of such Benefit Plans before the IRS, the
         Department of Labor, the PBGC or any other Governmental Authority.

                  (h) Required Contributions. All contributions required to be
         made by the Acquiror or the Acquiror's Subsidiaries to such Benefit
         Plans pursuant to their terms and provisions have been made timely.

                  (i) No ERISA Violations. As to any such Current Benefit Plan
         subject to Title IV of ERISA, (i) there has been no event or condition
         that presents the material risk of plan termination, (ii) no
         accumulated funding deficiency, whether or not waived, within the
         meaning of Section 302 of ERISA or Section 412 of the Code has been
         incurred, (iii), except as set forth in Subsection 5.13(i)(iii) of the
         Acquiror's Disclosure Letter, no reportable event within the meaning
         of Section 4043 of ERISA (for which the disclosure requirements of
         Regulation section 2615.3 promulgated by the PBGC have not been
         waived) has occurred within six years prior to the date of this
         Agreement, (iv) no notice of intent to terminate such Benefit Plan has
         been given under Section 4041 of ERISA, (v) no proceeding has been
         instituted under Section 4042 of ERISA to terminate such Benefit Plan,
         (vi) no liability to the Pension Benefit Guaranty Corporation has been
         incurred (other than with respect to required premium payments) and
         (vii) the assets of the Benefit Plan equal or exceed the actuarial
         present value of the benefit liabilities, within the meaning of
         Section 4041 of ERISA, under the Benefit Plan, based upon reasonable
         actuarial assumptions and the asset valuation principles established
         by the PBGC.

                  (j) Nondeductible Payments. Except as set forth in Subsection
         5.13(j) of the Acquiror's Disclosure Letter, in connection with the
         consummation of the transactions contemplated by this Agreement, no
         payment of money or other property, acceleration of benefits or
         provision of other rights has been or will be made under any such
         Current Benefit Plans or any of the programs, agreements, policies or
         other arrangements described in Subsection 5.13(l) of the Acquiror's
         Disclosure Letter that would be reasonably likely to be nondeductible
         under Section 280G of the Code, whether or not some other subsequent
         action or event would be required to cause such payment, acceleration
         or provision to be triggered.

                  (k) No Required Increases. Except as set forth in Subsection
         5.13(k) of the Acquiror's Disclosure Letter, the execution and
         delivery of this Agreement and the consummation of the transactions
         contemplated hereby will not (i) require the Acquiror or any of its
         Subsidiaries to make a larger contribution to, or pay greater benefits
         or provide other rights under, any Current Benefit Plan or any of the
         programs, agreements, policies or



                          AGREEMENT AND PLAN OF MERGER

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<PAGE>   32
         other arrangements described in Subsection 5.13(l) of the Acquiror's
         Disclosure Letter than it otherwise would, whether or not some other
         subsequent action or event would be required to cause such payment or
         provision to be triggered or (ii) create or give rise to any
         additional vested rights or service credits under any Current Benefit
         Plan or any of such programs, agreements, policies or other
         arrangements, whether or not some other subsequent action or event
         would be required to cause such creation or acceleration to be
         triggered.

                  (l) Severance and Employment Agreements. Except as set forth
         in Subsection 5.13(l) of the Acquiror's Disclosure Letter, neither the
         Acquiror nor any of its Subsidiaries is a party to or is bound by any
         severance agreement (involving $50,000 or more), program or policy.
         True and correct copies of all employment agreements with officers of
         the Acquiror and its Subsidiaries, and all vacation, overtime and
         other compensation policies of the Acquiror and its Subsidiaries
         relating to their employees have been made available to the Acquiror.

                  (m) Retiree Benefits. Except as set forth in Subsection
         5.13(m) of the Acquiror's Disclosure Letter, no Benefit Plan provides
         retiree medical or retiree life insurance benefits to any Person and
         neither the Acquiror nor any of its Subsidiaries is contractually or
         otherwise obligated (whether or not in writing) to provide any Person
         with life insurance or medical benefits upon retirement or termination
         of employment, other than as required by the provisions of Sections
         601 through 608 of ERISA and Section 4980B of the Code. Each Benefit
         Plan or other arrangement described in Subsection 5.13(m) of the
         Acquiror's Disclosure Letter may, except as described therein, be
         unilaterally amended or terminated in its entirety without liability
         except as to benefits accrued thereunder prior to such amendment or
         termination.

                  (n) Multiemployer Plans. Neither the Acquiror nor any of its
         Subsidiaries contributes or has an obligation to contribute, and has
         not within six years prior to the date of this Agreement contributed
         or had an obligation to contribute, to a multiemployer plan within the
         meaning of Section 3(37) of ERISA.

                  (o) Vacation Policies. Except as set forth in Subsection
         5.13(o) of the Acquiror's Disclosure Letter, the vacation policies of
         the Acquiror and its Subsidiaries do not provide for carryover
         vacation from one calendar year to the next.

                  (p) Collective Bargaining Agreements. Except as set forth in
         Section 5.13(p) of the Acquiror's Disclosure Letter, no collective
         bargaining agreement to which the Acquiror or any of its Subsidiaries
         is a party is currently in effect or is being negotiated by the
         Acquiror or any of its Subsidiaries. There is no pending or, to the
         Knowledge of the Acquiror, threatened labor dispute, strike or work
         stoppage against the Acquiror or any of its Subsidiaries that could
         reasonably be expected to have a Material Adverse Effect on the
         Acquiror. To the Knowledge of the Acquiror, neither the Acquiror or
         any of its Subsidiaries nor any representative or employee of the
         Acquiror or any of its Subsidiaries has in the United States committed
         any unfair labor practices in connection with the operation of the




                          AGREEMENT AND PLAN OF MERGER

                                      -27-

<PAGE>   33

         business of the Acquiror and its Subsidiaries, and there is no pending
         or, to the Knowledge of the Acquiror, threatened charge or complaint
         against the Acquiror or any of its Subsidiaries by the National Labor
         Relations Board or any comparable agency of any state of the United
         States.

         SECTION 5.14 Taxes.

                  (a) Tax Returns and Taxes. Except for such matters as could
         not reasonably be expected to have a Material Adverse Effect on the
         Acquiror, (i) all Tax Returns that are required to be filed by or with
         respect to the Acquiror or any of its Subsidiaries on or before the
         Effective Time have been or will be timely filed, (ii) all Taxes that
         are due on or before the Effective Time have been or will be timely
         paid in full, (iii) all withholding Tax requirements imposed on or
         with respect to the Acquiror or any of its Subsidiaries have been or
         will be satisfied in full in all respects and (iv) no penalty,
         interest or other charge is or will become due with respect to the
         late filing of any such Tax Return or late payment of any such Tax.

                  (b) Audits. Except as set forth in Subsection 5.14(b) of the
         Acquiror's Disclosure Letter, all Tax Returns have been audited by the
         applicable Governmental Authority or the applicable statute of
         limitations has expired for the period covered by such Tax Returns.

                  (c) Extensions of Times. Except as set forth in Subsection
         5.14(c) of the Acquiror's Disclosure Letter, there is not in force any
         extension of time with respect to the due date for the filing of any
         Tax Return or any waiver or agreement for any extension of time for
         the assessment or payment of any Tax due with respect to the period
         covered by any Tax Return.

                  (d) Claims. There is no claim against or with respect to the
         income, operations, business or capital of the Acquiror or any of its
         Subsidiaries for any Taxes, and no assessment, deficiency or
         adjustment has been asserted or proposed with respect to any Tax
         Return, that, in either case, could reasonably be expected to have a
         Material Adverse Effect on the Acquiror.

                  (e) Consolidated Tax Returns. Except as set forth in
         Subsection 5.14(e) of the Acquiror's Disclosure Letter, none of the
         Acquiror and its Subsidiaries has, during the last ten years, been a
         member of an affiliated group filing a consolidated federal income Tax
         Return.

                  (f) Final Company Return. The Acquiror represents that it
         will cause the timely filing of any required Tax Return relating to
         the federal income Taxes of the Company for the one day period ended
         at the Effective Time.

         SECTION 5.15 Environmental Matters. Except for matters disclosed in
Section 5.15 of the Acquiror's Disclosure Letter and except for matters that,
individually or in the aggregate,



                          AGREEMENT AND PLAN OF MERGER


                                      -28-

<PAGE>   34

could not reasonably be expected to have a Material Adverse Effect on the
Acquiror, (a) the properties, operations and activities of the Acquiror and its
Subsidiaries are in compliance with all applicable Environmental Laws; (b) the
Acquiror and its Subsidiaries and the properties and operations of the Acquiror
and its Subsidiaries are not subject to any existing, pending or, to the
Knowledge of the Acquiror, threatened action, suit, investigation, inquiry or
proceeding by or before any Court or Governmental Authority under any
Environmental Law; (c) all Permits, if any, required to be obtained or filed by
the Acquiror or any of its Subsidiaries under any Environmental Law in
connection with the business of the Acquiror and its Subsidiaries have been
obtained or filed and are valid and currently in full force and effect; (d)
there has been no release of any hazardous substance, pollutant or contaminant
into the environment by the Acquiror or its Subsidiaries or in connection with
their properties or operations; and (e) there has been no exposure of any
Person or property to any hazardous substance, pollutant or contaminant in
connection with the properties, operations and activities of the Acquiror and
its Subsidiaries; and (f) the Acquiror has made available to the Company all
internal and external audits and studies and all correspondence in the
possession of the Acquiror or any of its Subsidiaries relating to any
environmental matter involving to the Acquiror or any of its Subsidiaries that
is Material to the Acquiror.

         SECTION 5.16 Tax Matters. To the Knowledge of the Acquiror, neither
the Acquiror nor any of its Affiliates has taken or agreed to take any action
that would prevent the Merger from constituting a reorganization within the
meaning of section 368(a) of the Code. Specifically:

                  (a) Preservation of Proprietary Interest. In connection with
         the Merger, none of the Company Common Stock will be acquired by the
         Acquiror or a Person related (as defined in Treas. Reg. Section
         1.368-1(e)(3)) to the Acquiror for consideration other than Acquiror
         Class B Common Stock except for the cash received pursuant to Section
         3.01(a) and any cash paid in lieu of fractional share interests in
         Acquiror Class B Common Stock pursuant to Section 3.02(e).

                  (b) Assets. The Surviving Corporation will acquire at least
         90 percent of the fair market value of the Company's net assets and at
         least 70 percent of the fair market value of the Company's gross
         assets held by the Company immediately prior to the Merger, taking
         into account amounts used to pay Merger expenses, any dissenting
         holders of Company Common Stock and any distributions other than
         regular dividends.

                  (c) Acquiror's Plans. The Acquiror has no plan or intention
         to (i) liquidate the Surviving Corporation, (ii) merge the Surviving
         Corporation with or into another corporation, (iii) sell or otherwise
         dispose of the stock of the Surviving Corporation, (iv) cause the
         Surviving Corporation to issue additional shares of its capital stock
         that would result in the Acquiror's losing control (within the meaning
         of section 368(c) of the Code) of the Surviving Corporation, (v) cause
         or permit the Surviving Corporation to sell or otherwise dispose of
         any of the assets acquired from the Company except for dispositions
         made in the ordinary course of business or successive transfers of
         assets to one or more corporations controlled in each transfer by the
         transferor corporation or (vi) reacquire or cause any of its


                          AGREEMENT AND PLAN OF MERGER

                                      -29-

<PAGE>   35

         Subsidiaries to acquire any of the Acquiror Class B Common Stock
         issued to the holders of Company Common Stock in the Merger.

                  (d) No Natco Liabilities. The liabilities of the Company that
         will be assumed by the Surviving Corporation in the Merger and the
         liabilities to which the Company's assets are subject were incurred by
         the Company in the ordinary course of its business.

                  (e) Business Continuity. Following the Merger, the Surviving
         Corporation will continue the historic business of the Company or use
         a significant portion of its historic business assets in a business
         (within the meaning of Treas. Reg. Section 1.368-1(d)).

                  (f) Intercorporate Indebtedness. There is no intercorporate
         indebtedness existing between the Company and the Acquiror or between
         the Company and Natco that was issued, acquired, or will be settled at
         a discount.

         SECTION 5.17 Brokers. Except as set forth in Section 5.17 of the
Acquiror's Disclosure Letter, no broker, finder or investment banker is
entitled to any brokerage, finder's or other fee or commission in connection
with the transactions contemplated by this Agreement based upon arrangements
made by or on behalf of the Acquiror.

         SECTION 5.18 Intellectual Property. Other than as disclosed in Section
5.19 of the Acquiror's Disclosure Letter, the Acquiror and its Subsidiaries own
or hold licenses under or otherwise have the right to use or sublicense, all
foreign and domestic patents, trademarks (common law and registered), trademark
registration applications, service marks (common law and registered), service
mark registration applications, trade names and copyrights, copyright
applications, trade secrets, know-how and other proprietary information as are
necessary for the conduct of the businesses of the Acquiror and its
Subsidiaries as currently conducted except for any such intellectual property
as to which the failure to own or hold licenses could not reasonably be
expected to have a Material Adverse Effect on the Acquiror. Other than as
disclosed in Section 5.19 of the Acquiror's Disclosure Letter, neither the
Acquiror nor any of its Subsidiaries is currently in receipt of any notice of
infringement or notice of conflict with the asserted rights of others in any
patents, trademarks, service marks, trade names, trade secrets and copyrights
owned or held by other Persons, except, in each case, for matters that could
not reasonably be expected to have a Material Adverse Effect on the Acquiror.
Neither the execution and delivery of this Agreement nor consummation of the
transactions contemplated hereby will violate or breach the terms or cause any
cancellation of any Material license held by the Acquiror or any of its
Subsidiaries under any patent, trademark, service mark, trade name, trade
secret or copyright.

         SECTION 5.19 Certain Business Practices. To the Acquiror's Knowledge,
as of the date of this Agreement, neither the Acquiror or any of its
Subsidiaries nor any director, officer, employee or agent of the Acquiror or
any of its Subsidiaries has (i) used any funds for unlawful contributions,
gifts, entertainment or other unlawful payments relating to political activity,
(ii) made any unlawful payment to any foreign or domestic government official
or employee or to any foreign or domestic political party or campaign or
violated any provision of the Foreign Corrupt Practices


                          AGREEMENT AND PLAN OF MERGER

                                      -30-

<PAGE>   36

Act of 1977, as amended, (iii) consummated any transaction, made any payment,
entered into any agreement or arrangement or taken any other action in
violation of Section 1128B(b) of the Social Security Act, as amended, or (iv)
made any other unlawful payment, except for any such matters that could not
reasonably be expected to have a Material Adverse Effect on the Acquiror.


                                   ARTICLE VI

                                   COVENANTS

         SECTION 6.01 Affirmative Covenants. Each of the Company and the
Acquiror hereby covenants and agrees that, prior to the Effective Time, unless
otherwise expressly contemplated by this Agreement or consented to in writing
by the other, it will and will cause its Subsidiaries:

                  (a) Ordinary Course. To operate its business in the usual and
         ordinary course consistent with past practices;

                  (b) Maintenance of Organization. to use all reasonable
         efforts to preserve substantially intact its business organization,
         maintain its rights and franchises, retain the services of its
         respective key employees and maintain its relationships with its
         respective customers and suppliers;

                  (c) Maintenance of Assets. to maintain and keep its
         properties and assets in as good repair and condition as at present,
         ordinary wear and tear excepted, and maintain supplies and inventories
         in quantities consistent with its customary business practice; and

                  (d) Maintenance of Insurance. to use all reasonable efforts
         to keep in full force and effect insurance and bonds comparable in
         amount and scope of coverage to that currently maintained;

except for any matters that, individually or in the aggregate, could not
reasonably be expected to have a Material Adverse Effect on such party.

         SECTION 6.02 Negative Covenants.

                  (a) Except as set forth in Subsection 6.02(a) of the
         Company's Disclosure Letter, the Company covenants and agrees that,
         except as expressly contemplated by this Agreement or otherwise
         consented to in writing by the Acquiror, from the date of this
         Agreement until the Effective Time, it will not do, and will not
         permit any of its Subsidiaries to do, any of the following:

                           (i) Issuance of Securities. Offer, sell, issue or
                  grant, or authorize the offering, sale, issuance or grant, of
                  any Equity Securities of the Company, other than issuances of
                  Company Common Stock upon the exercise of Warrants
                  outstanding at the date of this Agreement in accordance with
                  the terms thereof (as in effect on the date of this
                  Agreement).


                          AGREEMENT AND PLAN OF MERGER


                                      -31-

<PAGE>   37

                           (ii) Redemptions and Purchases of Securities. (A)
                  Redeem, purchase or acquire, or offer to purchase or acquire,
                  any outstanding Equity Securities of the Company, (B) effect
                  any reorganization or recapitalization; or (C) split, combine
                  or reclassify any of the outstanding Equity Securities of the
                  Company or issue or authorize or propose the issuance of any
                  other Equity Securities in respect of, in lieu of or in
                  substitution for, outstanding Equity Securities of the
                  Company.

                           (iii) Dividends. Declare or pay any dividend on, or
                  make any other distribution in respect of, outstanding shares
                  of capital stock, except for cash dividends payable at the
                  end of each calendar quarter and for any period ending on or
                  before the Effective Time that, in the aggregate, approximate
                  the estimated liability of the holders of Company Common
                  Stock for federal and state income taxes relating to
                  operations of the Company for such calendar quarter or other
                  period immediately prior to the Effective Time and except
                  that the Company may pay a cash dividend on the Company
                  Common Stock in the aggregate amount of $37,000 on or before
                  the Closing Date.

                           (iv) Business Combinations. Acquire, by merging or
                  consolidating with, by purchasing an equity interest in or a
                  portion of the assets of, or in any other manner acquiring,
                  any business or any corporation, partnership, association or
                  other business organization or division thereof or otherwise
                  acquire any assets of any other Person (other than (x) the
                  purchase of assets from suppliers or vendors in the ordinary
                  course of business and consistent with past practice and (y)
                  other acquisitions of equity interests, assets and businesses
                  in an amount not to exceed $250,000 in the aggregate).

                           (v) Sale of Material Assets. Sell, lease, exchange
                  or otherwise dispose of, or to grant any Lien (other than a
                  Permitted Encumbrance) with respect to, any of the assets of
                  the Company or any of its Subsidiaries that are Material to
                  the Company, except for (x) dispositions of assets and
                  inventories in the ordinary course of business and consistent
                  with past practice and (y) dispositions of assets and
                  purchase money Liens incurred in connection with the original
                  acquisition of assets and secured by the assets acquired in
                  an amount not to exceed $250,000 in the aggregate.

                           (vi) Debt Incurrence. Incur any obligations for
                  borrowed money or purchase money indebtedness that are
                  Material to the Company, whether or not evidenced by a note,
                  bond, debenture or similar instrument, except (A) drawings
                  under credit lines existing at the date of this Agreement,
                  (B) purchase money indebtedness as to which Liens may be
                  granted as permitted by Subsection 6.02(a)(v), and (C) other
                  indebtedness incurred in the ordinary course of business
                  consistent with past practice and in no event (including
                  purchase money indebtedness incurred pursuant to clause (B))
                  in excess of $250,000.


                          AGREEMENT AND PLAN OF MERGER


                                      -32-

<PAGE>   38

                           (vii) Material Contracts. Enter into any Material
                  Contract with any third Person (other than customers and
                  vendors in the ordinary course of business) which provides
                  for an exclusive arrangement with that third Person or is
                  substantially more restrictive on the Company or
                  substantially less advantageous to the Company than Material
                  Contracts existing on the date hereof.

                           (viii) Charter Amendments. Adopt any amendments to
                  its charter or bylaws or other organizational documents that
                  would alter the terms of its capital stock or other equity
                  interests or would have a material adverse effect on the
                  ability of the Company to perform its obligations under this
                  Agreement.

                           (ix) Compensation Increases. (A) increase the
                  compensation payable to or to become payable to any director,
                  executive officer or employee, (B) grant any severance or
                  termination pay; (C) amend or otherwise modify the terms of
                  any outstanding options, warrants or rights the effect of
                  which shall be to make such terms more favorable to the
                  holders thereof; (D) take any action to accelerate the
                  vesting of any outstanding Company Stock Options; (E) amend
                  or take any other actions to increase the amount or
                  accelerate the payment or vesting of any benefit under any
                  Benefit Plan (including the acceleration of vesting, waiving
                  of performance criteria or the adjustment of awards or any
                  other actions permitted upon a change in control of such
                  party); except (i) pursuant to any contract, agreement or
                  other legal obligation of the Company existing at the date of
                  this Agreement, (ii) increases in salary payable or to become
                  payable upon promotion to an office having greater
                  operational responsibilities, (iii), in the case of severance
                  or termination payments, grants made pursuant to the
                  severance policy of the Company existing at the date of this
                  Agreement and (iv) in the case of options, warrants, rights
                  or Benefit Plans, amendments required by ERISA or other
                  applicable law.

                           (x) Employment and Other Agreements. (A) enter into
                  any employment or severance agreement with, any director,
                  officer or employee, either individually or as part of a
                  class of similarly situated persons or (B) establish, adopt
                  or enter into any new Benefit Plan; except employment and
                  severance agreements and Benefit Plans for the benefit of any
                  newly employed or promoted officers or employees, in which
                  case, the terms of such agreements and Benefit Plans shall be
                  reasonably consistent with those existing at the date of this
                  Agreement.

                           (xi) Tax and Accounting Changes. (A) Change any of
                  its methods of accounting in effect at December 31, 1997,
                  except as may be required to comply with GAAP, (B) make or
                  rescind any election relating to Taxes (other than any
                  election which must be made periodically which is made
                  consistent with past practice), (C) settle or compromise any
                  claim, action, suit, litigation, proceeding, arbitration,
                  investigation, audit or controversy relating to Taxes (except
                  where the cost to the Company and its Subsidiaries of such
                  settlements or compromises, individually or


                          AGREEMENT AND PLAN OF MERGER


                                      -33-

<PAGE>   39

                  in the aggregate, does not exceed $250,000) or (D) change any
                  of its methods of reporting income or deductions for federal
                  income tax purposes from those employed in the preparation of
                  the federal income tax returns for the taxable year ending
                  December 31, 1996, except, in each case, as may be required
                  by Law and for matters that could not reasonably be expected
                  to have a Material Adverse Effect on the Company.

                           (xii) Agreements. Agree in writing or otherwise to
                  do any of the foregoing.

                  (b) The Acquiror covenants and agrees that, except as
         expressly contemplated by this Agreement or otherwise consented to in
         writing by the Company, from the date of this Agreement until the
         Effective Time, it will not do, and will not permit any of its
         Subsidiaries to do, any of the following:

                           (i) Issuance of Securities. Offer, sell, issue or
                  grant, or authorize the offering, sale, issuance or grant, of
                  any Equity Securities of the Acquiror or any of its
                  Subsidiaries, other than issuances of (A) Acquiror Common
                  Stock or Acquiror Class A Common Stock upon the exercise of
                  Acquiror Stock Options outstanding at the date of this
                  Agreement in accordance with the terms thereof (as in effect
                  on the date of this Agreement), (B) Acquiror Class A Common
                  Stock pursuant to the Investment Agreement, (C) upon the
                  expiration of any restrictions upon issuance of any grant
                  existing at the date of this Agreement of restricted stock or
                  stock bonus pursuant to the terms (as in effect on the date
                  of this Agreement) of any Benefit Plans of the Acquiror or
                  any of its Subsidiaries or (D), periodically, pursuant to the
                  terms (as in effect on the date of this Agreement) of any
                  Benefit Plan of the Acquiror or any of its Subsidiaries.

                           (ii) Redemptions of Securities. Redeem, purchase or
                  acquire, or offer to purchase or acquire, any outstanding
                  Equity Securities of the Acquiror or any of its Subsidiaries
                  (other than (1) any such acquisition by the Acquiror or any
                  of its wholly-owned Subsidiaries directly from any
                  wholly-owned Subsidiary of the Acquiror in exchange for
                  capital contributions or loans to such Subsidiary, (2) any
                  repurchase, forfeiture or retirement of shares of Acquiror
                  Common Stock (or Acquiror Class A Common Stock) or Acquiror
                  Stock Options occurring pursuant to the terms (as in effect
                  on the date of this Agreement) of any existing Benefit Plan
                  of the Acquiror or any of its Subsidiaries, (3) any periodic
                  purchase of Acquiror Common Stock (or Acquiror Class A Common
                  Stock) for allocation to employee's accounts occurring
                  pursuant to the terms (as in effect on the date of this
                  Agreement) of any existing Benefit Plan of the Acquiror or
                  any of its Subsidiaries and (4) any redemption, purchase or
                  acquisition by a Subsidiary that could not reasonably be
                  expected to have a Material Adverse Effect on the Acquiror).

                           (iii) Dividends. Declare or to pay any dividend on,
                  or to make any other distribution in respect of, outstanding
                  shares of capital stock, except for dividends by


                          AGREEMENT AND PLAN OF MERGER


                                      -34-

<PAGE>   40

                  a wholly-owned Subsidiary of the Acquiror to the Acquiror or
                  another wholly-owned Subsidiary of the Acquiror.

                           (iv) Charter Amendments. Adopt any amendments to its
                  charter or bylaws or other organizational documents that
                  would alter the terms of the Acquiror's Common Stock other
                  than the Charter Amendment or could reasonably be expected
                  to have a material adverse effect on the ability of the
                  Acquiror to perform its obligations under this Agreement.

                           (v) Agreements. Agree in writing or otherwise to do
                  any of the foregoing.

         SECTION 6.03 Access and Information.

                  (a) Each of the parties shall, and shall cause its
         Subsidiaries to, (i) afford to the other party and its officers,
         directors, employees, accountants, consultants, legal counsel, agents
         and other representatives (collectively, the "Representatives" of such
         party) reasonable access at reasonable times upon reasonable prior
         notice to the officers, employees, agents, properties, offices and
         other facilities of such party and its Subsidiaries and to their books
         and records and (ii) furnish promptly to the other party and its
         Representatives such information concerning the business, properties,
         contracts, records and personnel of such party and its Subsidiaries
         (including financial, operating and other data and information) as may
         be reasonably requested, from time to time, by or on behalf of the
         other party.

                  (b) If this Agreement is terminated for any reason pursuant
         to Article IX hereof, a party that has received information in
         accordance with Section 6.03(a), within ten days after request
         therefor from the other party, shall return or destroy (and provide
         the other party within such ten-day time period with a certificate of
         an executive officer certifying such destruction) all of the
         information furnished to it and its Representatives pursuant to the
         provisions of Section 6.03(a) and all internal memoranda, analyses,
         evaluations and other similar material containing or reflecting any
         such information, in each case other than information available to the
         general public without restriction.

         SECTION 6.04 Confidentiality Agreement. The parties shall comply with,
and shall cause their respective Representatives to comply with, all of their
respective obligations under the Confidentiality Agreement.

         SECTION 6.05 Stockholders' Letter. The Company agrees to use all
reasonable efforts to obtain from each owner of shares of Company Common Stock
of record or, to the Knowledge of the Company, beneficially as of the date of
the Company Stockholders' Meeting a Stockholder's Letter dated the date of the
Company Stockholders' Meeting and from any Person who shall thereafter but
prior to the Closing Date become an owner of Company Common Stock of record or,
to the Knowledge of the Company, beneficially a Stockholder's Letter dated the
Closing Date.



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                                      -35-


<PAGE>   41

                                  ARTICLE VII

                             ADDITIONAL AGREEMENTS

         SECTION 7.01 Meeting of Stockholders. The Company shall, promptly
after the date of this Agreement, take all actions necessary in accordance with
the Corporate Statute and its certificate of incorporation and bylaws to
convene a special meeting of the Company's stockholders to consider approval
and adoption of this Agreement (the "Company Stockholders' Meeting"), and the
Company shall consult with the Acquiror in connection therewith. The Company
shall use all reasonable efforts to secure the vote or consent of stockholders
required by the Corporate Statute and its certificate of incorporation and
bylaws to approve and adopt this Agreement.

         SECTION 7.02 Appropriate Action; Consents; Filings.

                  (a) The Company and the Acquiror shall each use all
         reasonable efforts (i) to take, or to cause to be taken, all
         appropriate action, and to do, or to cause to be done, all things
         necessary, proper or advisable under applicable Law or otherwise to
         consummate and make effective the transactions contemplated by this
         Agreement, (ii) to obtain from any Governmental Entities any Permits
         or Orders required to be obtained or made by the Acquiror or the
         Company or any of their Subsidiaries in connection with the
         authorization, execution, delivery and performance of this Agreement
         and the consummation of the transactions contemplated hereby,
         including the Merger, (iii) to make all necessary filings, and
         thereafter make any other required submissions, with respect to this
         Agreement and the Merger required under (A) the Securities Act (in the
         case of Acquiror) and the Exchange Act and the Regulations thereunder,
         and any other applicable federal or state securities Laws, (B) the HSR
         Act and (C) any other applicable Law. The Acquiror and the Company
         shall cooperate with each other in connection with the making of all
         such filings, including providing copies of all such documents to the
         nonfiling party and its advisors prior to filings and, if requested,
         shall accept all reasonable additions, deletions or changes suggested
         in connection therewith. The Company and the Acquiror shall furnish
         all information required for any application or other filing to be
         made pursuant to any applicable Law or any applicable Regulations of
         any Governmental Authority in connection with the transactions
         contemplated by this Agreement.

                  (b) Each of the Company and the Acquiror shall give prompt
         notice to the other of (i) any notice or other communication from any
         Person alleging that the consent of such Person is or may be required
         in connection with the Merger, (ii) any notice or other communication
         from any Governmental Authority in connection with the Merger, (iii)
         any actions, suits, claims, investigations or proceedings commenced or
         threatened in writing against, relating to or involving or otherwise
         affecting the Company, the Acquiror or their Subsidiaries that relate
         to the consummation of the Merger, (iv) the occurrence of a default or
         event that, with notice or lapse of time or both, will become a
         default under any Material Contract of the Acquiror or of the Company,
         and (v) any change that is reasonably likely to have a Material
         Adverse Effect on the Company or the Acquiror or is likely to delay or
         impede the ability of either the Acquiror or the Company to consummate
         the transactions contemplated by this Agreement or to fulfill their
         respective obligations set forth herein.


                          AGREEMENT AND PLAN OF MERGER


                                      -36-

<PAGE>   42

                  (c) The Acquiror and the Company agree to cooperate and use
         all reasonable efforts vigorously to contest and resist any action,
         including legislative, administrative or judicial action, and to have
         vacated, lifted, reversed or overturned any Order (whether temporary,
         preliminary or permanent) of any Court or Governmental Authority that
         is in effect and that restricts, prevents or prohibits the
         consummation of the Merger or any other transactions contemplated by
         this Agreement, including the vigorous pursuit of all available
         avenues of administrative and judicial appeal and all available
         legislative action. The Acquiror and the Company also agree to take
         any and all actions, including the disposition of assets or the
         withdrawal from doing business in particular jurisdictions, required
         by any Court or Governmental Authority as a condition to the granting
         of any Permit or Order necessary for the consummation of the Merger or
         as may be required to avoid, lift, vacate or reverse any
         administrative or judicial action that would otherwise cause any
         condition to Closing not to be satisfied; provided, however, that in
         no event shall either party take, or be required to take, any action
         that could reasonably be expected to have an Material Adverse Effect
         on the Acquiror or the Company.

                  (d)      (i) Each of the Company and Acquiror shall give (or
                  shall cause their respective Subsidiaries to give) any
                  notices to third Persons, and use, and cause their respective
                  Subsidiaries to use, all reasonable efforts to obtain any
                  consents from third Persons (A) necessary, proper or
                  advisable to consummate the transactions contemplated by this
                  Agreement, (B) otherwise required under any contracts,
                  licenses, leases or other agreements in connection with the
                  consummation of the transactions contemplated hereby or (C)
                  required to prevent a Material Adverse Effect on the Company
                  from occurring prior to or after the Effective Time or a
                  Material Adverse Effect on the Acquiror from occurring after
                  the Effective Time.

                           (ii) If any party shall fail to obtain any consent
                  from a third Person described in Subsection (d)(i) above,
                  such party shall use all reasonable efforts, and shall take
                  any such actions reasonably requested by the other parties,
                  to limit the adverse effect upon the Company and Acquiror,
                  their respective Subsidiaries, and their respective
                  businesses resulting, or that could reasonably be expected to
                  result after the Effective Time, from the failure to obtain
                  such consent.

         SECTION 7.03 Tax Treatment. Each party hereto shall use all reasonable
efforts to cause the Merger to qualify, and shall not take, and shall use all
reasonable efforts to prevent any Affiliate of such party from taking, any
actions which could prevent the Merger from qualifying as a reorganization
under the provisions of Section 368(a) of the Code.

         SECTION 7.04 Public Announcements. The Acquiror and the Company shall
consult with each other before issuing any press release or otherwise making
any public statements with respect to the Merger and shall not issue any such
press release or make any such public statement prior to such consultation.



                          AGREEMENT AND PLAN OF MERGER


                                      -37-


<PAGE>   43
         SECTION 7.05 Exercise or Assumption of Warrants. BOCP joins in this
Agreement for the limited purpose of agreeing to exercise the Warrants
immediately after the Closing by providing, in the case of the Warrants issued
by the Company, to the Acquiror and, in the case of the Warrants granted by
stockholders of the Company, to such stockholders the exercise consideration,
and by executing and delivering all such documents and instruments, required by
the terms of the Warrants to be provided upon the exercise thereof. In
connection therewith, the Acquiror agrees to issue the Merger Consideration Per
Share of Company Common Stock for each share of Company Common Stock as to which
the Warrants issued by the Company are exercised in accordance with the terms
and provisions thereof, and agrees to make available at the Closing certificates
evidencing the Acquiror Class B Common Stock issuable upon exercise of all the
Warrants, such certificates to be registered in the name of BOCP in such
denominations as shall be requested by BOCP at least two Business Days prior to
the Closing. All such shares of Acquiror Class B Common Stock shall be deemed,
for purposes of subsection B of Section II of Article Fourth of the Certificate
of Incorporation of the Acquiror, as amended by the Charter Amendment, to have
been "received pursuant to the Merger Agreement" by BOCP.

         SECTION 7.06 Employee Benefit Plans. Until the first anniversary of the
Effective Time, the Acquiror shall and shall cause the Surviving Corporation to
provide each employee of the Company at the Effective Time ("Company
Participants") with employee benefits after the Effective Time that are
substantially comparable to similarly situated employees of the Acquiror;
provided, however, that for a period of time beginning at the Effective Time and
ending no later than December 31, 1998, the Acquiror may satisfy the
requirements of the preceding clause by continuing to maintain the Benefit Plans
of the Company existing at the Effective Time without change, except for changes
required by applicable law and changes not adverse to the Company Participants.
The Benefit Plans of the Acquiror and the Surviving Corporation in which Company
Participants are eligible to participate shall provide Company Participants with
credit for service prior to the Effective Time with the Company and its
predecessors, including The Dow Chemical Company.

         SECTION 7.07 Indemnification of Directors and Officers.

                  (a) Until six years from the Effective Time, the certificate
         of incorporation and bylaws of the Surviving Corporation as in effect
         immediately after the Effective Time shall not be amended to reduce or
         limit the rights of indemnity afforded to the present and former
         directors and officers of the Company thereunder or as to the ability
         of the Company to indemnify such persons or to hinder, delay or make
         more difficult the exercise of such rights of indemnity or the ability
         to indemnify. The Surviving Corporation will at all times exercise the
         powers granted to it by its certificate of incorporation, its bylaws
         and applicable law to indemnify to the fullest extent possible the
         present and former directors, officers, employees and agents of the
         Company against claims made against them arising from their service in
         such capacities prior to the Effective Time.

                  (b) If any claim or claims shall, subsequent to the Effective
         Time and within six years thereafter, be made against any present or
         former director, officer, employee or agent of the Company based on or
         arising out of the services of such Person prior to the Effective



                          AGREEMENT AND PLAN OF MERGER

                                      -38-


<PAGE>   44

         Time in the capacity of such Person as a director, officer, employee
         or agent of the Company, the provisions of subsection (a) of this
         Section respecting the certificate of incorporation and bylaws of the
         Surviving Corporation shall continue in effect until the final
         disposition of all such claims.

                  (c) The Acquiror hereby agrees after the Effective Time to
         guarantee the payment of the Surviving Corporation's indemnification
         obligations described in Subsection 7.07(a) up to an amount determined
         as of the Effective Time equal to (i) the fair market value of any
         assets of the Surviving Corporation or any of its Subsidiaries
         distributed to the Acquiror or any of its Subsidiaries (other than the
         Surviving Corporation and its Subsidiaries), minus (ii) any
         liabilities of the Surviving Corporation or any of its Subsidiaries
         assumed by the Acquiror or any of its Subsidiaries (other than the
         Surviving Corporation and its Subsidiaries), minus (iii) the fair
         market value of any assets of the Acquiror or any of its Subsidiaries
         (other than the Surviving Corporation and its Subsidiaries)
         contributed to the Surviving Corporation or any of its Subsidiaries
         and (iv) plus any liabilities of the Acquiror or any of its
         Subsidiaries (other than the Surviving Corporation and its
         Subsidiaries) assumed by the Surviving Corporation or any of its
         Subsidiaries. If any other entity is merged with or into the Surviving
         Corporation or the Surviving Corporation acquires any other Material
         business or Material portion of the assets of another entity, the
         Acquiror shall assume all obligations to indemnify the former
         directors and officers of the Company hereunder.

                  (d) Notwithstanding Subsection (a), (b) or (c) of this
         Section 7.07, the Acquiror and the Surviving Corporation shall be
         released from the obligations imposed by such subsection if the
         Acquiror shall assume the obligations of the Surviving Corporation
         thereunder by operation of Law or otherwise. Notwithstanding anything
         to the contrary in this Section 7.07, neither the Acquiror nor the
         Surviving Corporation shall be liable for any settlement effected
         without its written consent, which shall not be unreasonably withheld.

                  (e) The provisions of this Section 7.07 are intended to be
         for the benefit of, and shall be enforceable by, each Person entitled
         to indemnification hereunder and the heirs and representatives of such
         Person.

         SECTION 7.08 Event Notices. From and after the date of this Agreement
until the Effective Time, each party hereto shall promptly notify the other
party hereto of (i) the occurrence or nonoccurrence of any event the occurrence
or nonoccurrence of which would be likely to cause any condition to the
obligations of such party to effect the Merger and the other transactions
contemplated by this Agreement not to be satisfied and (ii) the failure of such
party to comply with any covenant or agreement to be complied with by it
pursuant to this Agreement which would be likely to result in any condition to
the obligations of such party to effect the Merger and the other transactions
contemplated by this Agreement not to be satisfied. No delivery of any notice
pursuant to this Section 7.08 shall cure any breach of any representation or
warranty or any failure to comply with any covenant or agreement of such party
contained in this Agreement or otherwise limit or affect the remedies available
hereunder to the party receiving such notice.



                          AGREEMENT AND PLAN OF MERGER

                                      -39-

<PAGE>   45

         SECTION 7.09 Company Tax Audit. The Designated Company Stockholders
shall have the right to defend, at their sole cost, any audit of the Company
for any taxable year ending on or prior to the Closing Date and shall have the
right to defend all tax issues arising in any such year. The Designated Company
Stockholders shall be entitled to make all decisions relating to any such
audit, including the right to settle any issue. The Acquiror and Natco agree to
cooperate in any manner reasonably requested by the Designated Company
Stockholders, including providing all requested information in Acquiror's or
Natco's possession and signing any documents or forms, relating to any such
audit. To the extent necessary to implement the foregoing, the Acquiror and
Natco agree to execute, at the Closing, a power of attorney in favor of Douglas
P. Heller to conduct all and any of the foregoing activities on behalf of the
Company, and the Acquiror agrees that it will not revoke such power of attorney
during the pendency of any audit contemplated by this Section 7.09.

         SECTION 7.10 Escrow Arrangement. At the Closing, the certificates
evidencing 450,000 shares of Class B Common Stock (the "Escrow Shares")
issuable to the Designated Company Stockholders but for the provisions of this
Section 7.10 shall be deposited in escrow pursuant to an escrow agreement with
Chase Bank of Texas, N.A., as escrow agent (the "Escrow Agent"), in form and
substance substantially similar to the form thereof attached hereto as Annex C
(the "Escrow Agreement"). The Escrow Shares shall be withheld from the shares
of Class B Common Stock otherwise to be issued to the Designated Company
Stockholders pursuant to Section 3.01 promptly after the Effective Time pro
rata in accordance with the number of shares of Class B Common Stock to be
issued to each (except that no fractional shares shall be allocated to any
stockholder). On September 30, 1999 or as soon thereafter as reasonably
practicable, the Acquiror and the Representative (the "Escrow Parties") shall
give written instructions to the Esrow Agent with respect to the disposition of
the Escrow Shares in accordance with the provisions of this Section 7.10 and
the Escrow Agreement. The Escrow Parties shall instruct the Escrow Agent to
release from escrow and deliver to the Designated Company Stockholders that
number of Escrow Shares that shall equal the number obtained by: (i) dividing
(A) the aggregate amount of revenues, if any, billed in the ordinary course of
business by the Surviving Corporation to the CTOC Project through September 30,
1999 by (B) $1,000; and (ii) multiplying the quotient by 22. The Escrow Parties
shall concurrently instruct the Escrow Agent to release from escrow and deliver
to the Designated Company Stockholders any other capital stock or securities,
cash or other property theretofore delivered to the Escrow Agent and held in
escrow to the extent that such capital stock, securities, cash or other
property has been distributed or paid with respect to the Escrow Shares then
being released from escrow. The Escrow Shares released from escrow (and such
capital stock, securities, cash or other property) shall be delivered to the
Designated Company Stockholders pro rata in accordance with the number of
shares of Class B Common Stock issued to each pursuant to Section 3.01 promptly
after the Effective Time (except that no fractional shares shall be allocated
to any stockholder). Any remaining Escrow Shares shall be delivered to the
Acquiror for cancellation and restoration to the status of authorized but
unissued Class B Common Stock.

         SECTION 7.11 The Cynara Name. The Acquiror and the Company shall take
all reasonable actions necessary or desirable in order to preserve the
availability of the name "The



                          AGREEMENT AND PLAN OF MERGER

                                      -40-

<PAGE>   46

Cynara Company" and all variations thereof under the Corporate Statute and
under applicable tradename Laws.

         SECTION 7.12 Natco. The Acquiror shall take all action necessary to
cause Natco to perform its obligations under this Agreement and to consummate
the Merger on the terms and conditions set forth in this Agreement.

         SECTION 7.13 Avoidance of Diminution of Put. The Acquiror hereby
agrees, for the benefit of the Designated Company Stockholders, that it will
use all reasonable efforts, in amending the Bank Credit Agreement after the
Effective Time or in negotiating any other credit agreement in lieu of or in
addition to the Bank Credit Agreement, to avoid undertaking covenants that
limit or restrict the ability of the Acquiror to perform its obligations with
respect to any Put (as defined therein) exercised pursuant to the terms of
Section II (B) of the Certificate of Incorporation, as amended, of the
Acquiror.

                                  ARTICLE VIII

                               CLOSING CONDITIONS

         SECTION 8.01 Conditions to Obligations of Each Party Under This
Agreement. The respective obligations of each party to effect the Merger and
the other transactions contemplated hereby shall be subject to the satisfaction
at or prior to the Effective Time of the following conditions, any or all of
which may be waived by the parties hereto, in whole or in part, to the extent
permitted by applicable Law:


                  (a) Stockholder Approval. This Agreement shall have been
         approved and adopted by the requisite vote of the stockholders of the
         Company as required by the Corporate Statute.

                  (b) No Order. No Governmental Authority or Court shall have
         enacted, issued, promulgated, enforced or entered any Law, Regulation
         or Order (whether temporary, preliminary or permanent) that is in
         effect and that has the effect of making the Merger illegal or
         otherwise prohibiting consummation of the Merger.

                  (c) HSR Act. The applicable waiting period under the HSR Act
         shall have expired or been terminated.

                  (d) Foreign Governmental Authorities. The applicable waiting
         period under any competition Laws, Regulations and Orders of foreign
         Governmental Authorities, as set forth in the Acquiror's Disclosure
         Letter and the Company's Disclosure Letter, shall have expired or been
         terminated and any Permits or Orders required thereunder in order to
         consummate the Merger shall have been received by the parties hereto.


                          AGREEMENT AND PLAN OF MERGER

                                      -41-

<PAGE>   47
                  (e) Dissenting Stockholders. No holders of Company Common
         Stock shall have dissented from the Merger under conditions such that
         the aggregate amount of the Merger Consideration otherwise payable
         with respect to shares of Company Common Stock held by such holders,
         together with the Merger Expenses payable by the Company, shall equal
         or exceed nine percent (9%) of the total Merger Consideration payable
         with respect to all shares of Company Common Stock assuming no such
         holders dissented from the Merger.

                  (f) Registration Rights Agreement. The Registration Rights
         Agreement among the Acquiror and the Designated Company Stockholders
         shall have been executed and delivered by such parties.

                  (g) Charter Amendment. The Charter Amendment shall have been
         approved by the Stockholders, shall have been filed with the Secretary
         of State of the State of Delaware and shall have become effective in
         accordance with the Charter Amendment.

         SECTION 8.02 Additional Conditions to Obligations of the Acquiror
Companies. The obligations of the Acquiror Companies to effect the Merger and
the other transactions contemplated hereby shall be subject to the satisfaction
at or prior to the Effective Time of the following conditions, any or all of
which may be waived by the Acquiror Companies, in whole or in part, to the
extent permitted by applicable Law:

                  (a) Representations and Warranties. Each of the
         representations and warranties of the Company contained in this
         Agreement that is qualified as to materiality shall be true and
         correct in all respects and each of such representations and
         warranties that is not so qualified shall be true and correct in all
         material respects as of the date of this Agreement and as of the
         Closing Date as though made again on and as of the Closing Date. The
         Acquiror Companies shall have received a certificate of the President
         and the Chief Financial Officer of the Company, dated the Closing
         Date, to such effect.

                  (b) Agreements and Covenants. The Company shall have
         performed or complied in all material respects with all agreements and
         covenants required by this Agreement to be performed or complied with
         by it on or prior to the Closing Date. The Acquiror Companies shall
         have received a certificate of the President and the Chief Financial
         Officer of the Company, dated the date of the Closing Date, to such
         effect.

                  (c) Tax Opinion. The Acquiror shall have received the opinion
         dated on or prior to the Closing Date of Vinson & Elkins LLP to the
         effect that (i) the Merger will constitute a reorganization under
         section 368(a) of the Code, (ii) the Acquiror, the Company and Natco
         will each be a party to that reorganization, and (iii) no gain or loss
         will be recognized by the Acquiror, the Company or Natco by reason of
         the Merger.

                  (d) Stockholders' Letters. The Acquiror shall have received
         from each owner of shares of Company Common Stock of record or, to the
         Knowledge of the Company, beneficially as of the date of the Company
         Stockholders' Meeting a Stockholder's Letter




                          AGREEMENT AND PLAN OF MERGER

                                      -42-

<PAGE>   48
         dated the date of the Company Stockholders' Meeting and from any
         Person who shall thereafter but prior to the Closing Date become an
         owner of Company Common Stock of record or, to the Knowledge of the
         Company, beneficially a Stockholder's Letter dated the Closing Date.

                  (e) Financing. The lenders under the Bank Credit Agreement
         shall have made available funds to National Tank Company for the
         purpose of funding, and in an amount sufficient to fund, the cash
         portion of the Merger Consideration.

         SECTION 8.03 Additional Conditions to Obligations of the Company. The
obligations of the Company to effect the Merger and the other transactions
contemplated hereby shall be subject to the satisfaction at or prior to the
Effective Time of the following conditions, any or all of which may be waived
by the Company, in whole or in part, to the extent permitted by applicable Law:

                  (a) Representations and Warranties. Each of the
         representations and warranties of the Acquiror Companies contained in
         this Agreement that is qualified as to materiality shall be true and
         correct in all respects and each of such representations and
         warranties that is not so qualified shall be true and correct in all
         material respects as of the date of this Agreement and as of the
         Closing Date as though made again on and as of the Closing Date. The
         Company shall have received a certificate of the President and the
         Chief Financial Officer of each of the Acquiror Companies, dated the
         Closing Date, to such effect.

                  (b) Agreements and Covenants. The Acquiror Companies shall
         have performed or complied in all material respects with all
         agreements and covenants required by this Agreement to be performed or
         complied with by them on or prior to the Closing Date. The Company
         shall have received a certificate of the President and the Chief
         Financial Officer of each of the Acquiror Companies, dated the Closing
         Date, to such effect.

                  (c) Tax Opinion. The Company shall have received the opinion
         dated on or prior to the Closing Date of Reed Smith Shaw & McClay, LLP
         to the effect that (i) the Merger will constitute a reorganization
         under section 368(a) of the Code, (ii) the Acquiror, the Company and
         Natco will each be a party to that reorganization, and (iii) no gain
         or loss will be recognized by the stockholders of the Company upon the
         receipt of shares of Acquiror Class B Common Stock in exchange for
         shares of Company Common Stock pursuant to the Merger except with
         respect to the cash portion of the Merger Consideration Per Share of
         Company Common Stock, any cash received in lieu fractional share
         interests, and any of the Conditional Earned Shares, the Accelerated
         Earned Shares and Earned Shares treated as imputed interest.

                  (d) Bank Debt. The Acquiror Companies shall have either paid
         in full the outstanding indebtedness under the Company's credit
         facility at Banc One, Texas, N.A. or agreed with such bank to cause
         the Surviving Corporation to assume the indebtedness under such credit
         facility.



                          AGREEMENT AND PLAN OF MERGER

                                      -43-

<PAGE>   49

                  (e) Stockholders' Agreement. The Stockholders' Agreement
         shall have been executed and delivered by Cap I, Cap II and the
         Designated Company Stockholders.

                  (f) Investment Agreement. The transactions contemplated by
         the Investment Agreement shall have been consummated.

                                   ARTICLE IX

                                INDEMNIFICATION

         SECTION 9.01 Survival of Representations, Warranties, Covenants and
Agreements. The representations and warranties of the parties contained in
Articles IV and V (other than those contained in Sections 4.14 and 5.14) shall
survive both the Closing and any investigation by the parties with respect
thereto but shall terminate and be of no further force or effect on the first
anniversary of the Closing Date. The representations and warranties contained
in Section 4.14 and 5.14 shall survive the Closing and any investigation by the
parties with respect thereto but shall terminate and be of no further force or
effect on the earlier of the fourth anniversary of the Closing Date or, in the
case of Section 4.14 or Section 5.14, respectively, the date that is thirty
(30) days after the results of an audit by the Internal Revenue Service of the
federal income tax returns of the Company or the Acquiror through the Closing
have been reported to the Company or the Representative, respectively.
Notwithstanding the foregoing, any such representation or warranty as to which
a bona fide claim relating thereto is asserted in writing in accordance with
Section 9.02 during such survival period shall, with respect only to such
claim, survive such survival period pending resolution thereof. The covenants
and agreements in this Article IX shall survive the Closing and shall remain in
full force and effect for such period as is necessary to resolve any bona fide
claim made with respect to any representation or warranty contained in this
Agreement during the survival period thereof. The remaining covenants and
agreements of the parties hereto contained in this Agreement shall survive the
Closing without any contractual limitation on the period of survival.

         SECTION 9.02 General Indemnification.

                  (a) If the transactions contemplated hereby to occur at the
         Closing are effected, the Acquiror, on the one hand, hereby agrees,
         and the Designated Company Stockholders, on the other, hereby
         severally agree (the Acquiror and such holders together each being an
         "Indemnifying Party"), from and after the Closing, to indemnify and
         hold harmless all those persons who hold Company Common Stock
         immediately prior to the Effective Time, on the one hand, and the
         Acquiror, on the other (each such group or person being the
         "Indemnified Party") against any losses, claims, damages or
         liabilities ("Losses") that such Indemnified Party shall actually
         incur, to the extent that such Losses (or actions, suits or
         proceedings in respect thereof and any appeals therefrom
         ("Proceedings")):


                          AGREEMENT AND PLAN OF MERGER

                                      -44-

<PAGE>   50
                           (i) arise out of or are based upon any allegation
                  that any representation or warranty made herein in Article IV
                  or V for the benefit of the Acquiror or the Company,
                  respectively, is untrue or has been breached in any respect;
                  or

                           (ii) arise out of or are based upon any allegation
                  that any covenant or agreement made herein for the benefit of
                  the Indemnified Party by the Indemnifying Party has not been
                  performed in accordance with its terms;

         and will reimburse the Indemnified Party for any legal or other
         expenses reasonably incurred by it in connection with investigating or
         defending against any such Losses or Proceedings. Notwithstanding the
         foregoing, the Indemnifying Party shall be severally liable to the
         Indemnified Party under this Section only for the amount of individual
         Losses incurred by the Indemnified Party that exceed $250,000 in the
         aggregate; provided, however, that the amount of such Losses that are
         subject to indemnification hereunder shall not exceed $2,500,000 in
         the aggregate for all Designated Company Stockholders on the one hand
         and the Acquiror on the other; and provided, further, that the Losses
         incurred by an Indemnified Party shall, for purposes of determining
         the threshold level thereof in accordance with this sentence and
         otherwise, be offset by (i) the proceeds of any insurance received by
         the Indemnified Party with respect thereto and (ii) the amount of any
         federal income tax benefit actually realized by the Indemnified Party
         with respect thereto. No Designated Company Stockholder shall be
         liable hereunder for more than his pro rata share of Losses (based on
         the number of shares of Company Common Stock owned immediately prior
         to the Effective Time, including for this purpose the shares of
         Company Common Stock issuable upon exercise of all the Warrants) and
         may elect, in his sole discretion, to pay such Losses in cash or in
         Acquiror Class B Common Stock or both. If the Designated Company
         Stockholder shall elect to pay all or any portion of such Losses in
         Acquiror Class B Common Stock, the value of such Acquiror Class B
         Common Stock shall be deemed to be $13.00 per share, subject to
         adjustment pursuant to the last sentence of Section 3.01(a) or Section
         3.01(h), or both, as the case may be.

                  (b) Promptly after receipt by the Indemnified Party under
         subsection (a) of this Section of notice of a Loss or the commencement
         of any Proceeding against which it believes it is indemnified under
         this Section, the Indemnified Party shall, if a claim in respect
         thereto is to be made against the Indemnifying Party under this
         Section, notify the Indemnifying Party in writing of the commencement
         thereof; provided, however, that the omission so to notify the
         Indemnifying Party shall not relieve it from any liability which it
         may have to the Indemnified Party to the extent that the Indemnifying
         Party is not prejudiced by such omission.

                  (c) The Indemnifying Party shall, within thirty (30) days
         after receipt of a notice of Loss or Proceeding given pursuant to
         subsection (b) of this Section, either (i) acknowledge liability, as
         between the Indemnifying Party and the Indemnified Party, for such
         Loss or the amount in controversy in such Proceeding and pay the
         Indemnified Party the amount of such Loss or the amount in controversy
         in such Proceeding in cash in immediately available funds



                          AGREEMENT AND PLAN OF MERGER

                                      -45-

<PAGE>   51
         (or establish by agreement with the Indemnified Party an alternative
         payment schedule), (ii) acknowledge liability, as between the
         Indemnifying Party and the Indemnified Party, for such Loss or the
         amount in controversy in such Proceeding, disavow the validity of the
         Loss or Proceeding or the amount thereof and, in the case of a
         proceeding to the extent that it shall so desire in accordance with
         subsection (d) of this Section, assume the legal defense thereof, or
         (iii) object (or reserve the right to object until additional
         information is obtained) to the claim for indemnification or the
         amount thereof, setting forth the grounds therefor in reasonable
         detail. If the Indemnifying Party does not respond to the Indemnified
         Party as provided in this subsection within such 30-day period, the
         Indemnifying Party shall be deemed to have acknowledged its liability
         for such indemnification claim in accordance with clause (i) of this
         subsection and the Indemnified Party may exercise any and all of its
         rights under applicable law to collect such amount.

                  (d) In the case of a Loss as to which the Indemnifying Party
         shall have responded pursuant to clause (ii) or (iii) of subsection
         (c) above, the parties shall attempt in good faith to resolve their
         differences for a period of 60 days following receipt by the
         Indemnified Party or Parties of the response of the Indemnifying Party
         pursuant to subsection (c) above and, if the parties are unable to
         resolve their differences within such period, the Indemnified Party or
         Parties may submit the matter to arbitration in accordance with the
         provisions of Section 11.09.

                  (e) If a Proceeding shall be brought against an Indemnified
         Party and it shall notify the Indemnifying Party thereof in accordance
         with subsection (b) of this Section, the Indemnifying Party shall, if
         it shall have responded to such notice in accordance with clause (ii)
         of subsection (c) of this Section, be entitled to assume the legal
         defense thereof with counsel reasonably satisfactory to the
         Indemnified Party. After notice from the Indemnifying Party to the
         Indemnified Party of its election to assume the defense of such claim
         or such action, the Indemnifying Party shall not be liable to the
         Indemnified Party under this Section for any attorney's fees or other
         expenses (except reasonable costs of investigation) subsequently
         incurred by the Indemnified Party in connection with the defense
         thereof. If the Indemnifying Party does not assume the defense of a
         Proceeding as to which it has acknowledged liability, as between
         itself and the Indemnified Party, pursuant to clause (ii) of
         subsection (c) of this Section, the Indemnified Party may require the
         Indemnifying Party to reimburse it on a current basis for its
         reasonable expenses of investigation, reasonable attorney's fees and
         expenses and reasonable out-of-pocket expenses incurred in the defense
         thereof and, subject to the provisions of subsection (f) of this
         Section, the Indemnifying Party shall be bound by the result obtained
         with respect thereto by the Indemnified Party.

                  (f) An Indemnifying Party will not, without the prior written
         consent of the Indemnified Party (which consent shall not be
         unreasonably withheld), settle or compromise or consent to the entry
         of any judgment with respect to any pending or threatened Proceeding
         in respect of which indemnification or contribution may be sought
         hereunder (whether or not the Indemnified



                          AGREEMENT AND PLAN OF MERGER

                                      -46-

<PAGE>   52

         Party is an actual or potential party to such Proceeding) unless such
         settlement, compromise or consent includes an unconditional release of
         the Indemnified Party from all liability arising out of such
         Proceeding. If the Indemnifying Party has responded to the Indemnified
         Party pursuant to clause (i) of subsection (c) of this Section, the
         Indemnified Party may settle or compromise or consent to the entry of
         any judgment with respect to the Proceeding that was the subject of
         notice to the Indemnifying Party pursuant to subsection (c) of this
         Section without the consent of the Indemnifying Party (but no such
         settlement, compromise or consent shall increase the indemnification
         obligation of the Indemnifying Party to which it has consented
         pursuant to clause (i) of subsection (c) of this Section). An
         Indemnified Party will not otherwise, without the prior written
         consent of the Indemnifying Party (which consent shall not be
         unreasonably withheld), settle or compromise or consent to the entry
         of any judgment with respect to any pending or threatened Proceeding,
         but, if such Proceeding is settled or compromised or if there is
         entered any judgment with respect to any such Proceeding, in either
         case with the consent of the Indemnifying Party, or if there be a
         final judgment of the plaintiff in any such Proceeding, the
         Indemnifying Party agrees to indemnify and hold harmless any
         Indemnified Party from and against any loss or liability by reason of
         such settlement, compromise or judgment.

                  (g) From and after the Closing, the provisions of this
         Section shall be the sole and exclusive remedy of each party hereto
         for (i) any breach of the other party's representations or warranties
         contained in this Agreement or (ii) any breach of the other party's
         covenants or agreements contained in this Agreement.

                  (h) From and after the Closing, all representations,
         warranties, covenants and agreements herein to or for the benefit of
         the Company by the Acquiror shall be deemed to be representations,
         warranties, covenants and agreements directly to, with and for the
         benefit of the Designated Company Stockholders and the Designated
         Company Stockholders shall have the right to indemnification in
         accordance with Article IX from the Acquiror in connection therewith.

                                   ARTICLE X

                       TERMINATION, AMENDMENT AND WAIVER

         SECTION 10.01 Termination. This Agreement may be terminated at any
time prior to the Effective Time, whether before or after approval of this
Agreement by the stockholders of the Company:

                  (a) by mutual consent of the Acquiror and the Company;

                  (b) by the Acquiror, upon a breach of any covenant or
         agreement on the part of the Company set forth in this Agreement, or
         if any representation or warranty of the Company shall have become
         untrue, in either case such that the conditions set forth in
         Subsection 8.02(a) or Subsection 8.02(b) would not be satisfied (a
         "Terminating Company Breach"); provided that, if (i) such Terminating
         Company Breach is curable by the Company through the exercise of
         reasonable efforts and (ii) the Company is exercising reasonable



                          AGREEMENT AND PLAN OF MERGER

                                      -47-

<PAGE>   53
         efforts to cure the Terminating Company Breach, the Acquiror may not,
         for such period not exceeding 30 days as the Company continues to
         exert such efforts, terminate this Agreement under this Subsection
         9.01(b);

                  (c) by the Company, upon breach of any covenant or agreement
         on the part of the Acquiror Companies set forth in this Agreement, or
         if any representation or warranty of the Acquiror Companies shall have
         become untrue, in either case such that the conditions set forth in
         Subsection 8.03(a) or Subsection 8.03(b) would not be satisfied (a
         "Terminating Acquiror Breach"); provided that, if (i) such Terminating
         Acquiror Breach is curable by the Company through the exercise of
         reasonable efforts and (ii) the Acquiror is exercising reasonable
         efforts to cure the Terminating Acquiror Breach, the Company may not
         terminate, for such period not exceeding 30 days as the Acquiror
         continues to exert such efforts, this Agreement under this Subsection
         9.01(c);

                  (d) by either Acquiror or the Company, if there shall be any
         Order which is final and nonappealable preventing the consummation of
         the Merger, unless the party relying on such Order has not complied
         with its obligations under Section 7.03;

                  (e) by either Acquiror or the Company, if the Merger shall
         not have been consummated before November 30, 1998; or

                  (f) by either Acquiror or the Company, if this Agreement
         shall fail to receive the requisite vote for approval and adoption by
         the stockholders of the Company at the Stockholders' Meeting.

         The right of any party hereto to terminate this Agreement pursuant to
this Section 9.01 shall remain operative and in full force and effect
regardless of any investigation made by or on behalf of any party hereto, any
Person controlling any such party or any of their respective officers,
directors, representatives or agents, whether prior to or after the execution
of this Agreement.

         SECTION 10.02 Effect of Termination. Except as provided in Section
10.05 or Section 10.01 of this Agreement, in the event of the termination of
this Agreement pursuant to Section 10.01, this Agreement shall forthwith become
void, there shall be no liability on the part of the Acquiror Companies or the
Company or any of their respective officers or directors to the other and all
rights and obligations of any party hereto shall cease, except that nothing
herein shall relieve any party from liability for any breach of this Agreement.

         SECTION 10.03 Amendment. This Agreement may be amended by the parties
hereto by action taken by or on behalf of their respective Boards of Directors
at any time prior to the Effective Time; provided, however, that, after
approval of the Merger by the stockholders of the Company, no amendment may be
made which would reduce the amount or change the type of consideration into
which each share of Company Common Stock shall be converted pursuant to this
Agreement upon consummation of the Merger. This Agreement may not be amended
except by an instrument in writing signed by the parties hereto.


                          AGREEMENT AND PLAN OF MERGER

                                      -48-


<PAGE>   54

         SECTION 10.04 Waiver. At any time prior to the Effective Time, any
party hereto may (a) extend the time for the performance of any of the
obligations or other acts of the other party hereto, (b) waive any inaccuracies
in the representations and warranties of the other party contained herein or in
any document delivered pursuant hereto and (c) waive compliance by the other
party with any of the agreements or conditions contained herein. Any such
extension or waiver shall be valid only if set forth in an instrument in
writing signed by the party or parties to be bound thereby. For purposes of
this Section 10.04, the Acquiror Companies shall be deemed to be one party.

         SECTION 10.05 Fees, Expenses and Other Payments. All Expenses incurred
by the parties hereto shall be borne solely and entirely by the party which has
incurred such Expenses; provided, however, that the Acquiror may, at its
option, pay any Expenses of the Company and, provided further, that the Company
shall bear all expenses of Reed Smith Shaw & McClay LLP in connection with this
Agreement and the transactions contemplated herein.

                                   ARTICLE XI

                               GENERAL PROVISIONS

         SECTION 11.01 Notices. All notices and other communications given or
made pursuant hereto shall be in writing and shall be deemed to have been duly
given upon receipt, if delivered personally, mailed by registered or certified
mail (postage prepaid, return receipt requested) to the parties at the
following addresses or sent by electronic transmission to the telecopier number
specified below:

                  (a)      If to any of the Acquiror Companies, to:

                           NATCO Group Inc.
                           2950 North Loop West
                           Suite 750
                           Houston, Texas 77092
                           Attention:  William B. Wiener III
                                       Senior Vice President and
                                       Chief Financial Officer
                           Telecopier No.:  713/683-7841

                  with a copy to:

                           Vinson & Elkins L.L.P.
                           First City Tower
                           1001 Fannin
                           Houston, Texas  77002-6760
                           Attention:  William E. Joor III
                           Telecopier No.: (713) 758-2346



                          AGREEMENT AND PLAN OF MERGER

                                      -49-

<PAGE>   55

                  (b)      If to the Company, to:
                           The Cynara Company
                           2925 Briarpark
                           Suite 1200
                           Houston, Texas 77042
                           Attention: Richard D. Peters
                           Telecopier No.: (713) 975-9611

                  with copies to:

                           George K. Hickox, Jr.
                           Heller Hickox Dimeling Schreiber & Park
                           1629 Locust Street
                           Philadelphia, Pennsylvania 19103
                           Telecopier No.:  (215) 546-1041

                           and

                           Lori L. Lasher, Esquire
                           Reed Smith Shaw & McClay, LLP
                           2500 One Liberty Place
                           1650 Market Street
                           Philadelphia, Pennsylvania 19103
                           Telecopier No.:  (215) 851-1420

or to such other address or telecopier number as any party may, from time to
time, designate in a written notice given in a like manner. Notice given by
telecopier shall be deemed delivered on the day the sender receives telecopier
confirmation that such notice was received at the telecopier number of the
addressee. Notice given by mail as set out above shall be deemed delivered
three days after the date the same is postmarked.

         SECTION 11.02 Headings. The headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

         SECTION 11.03 Severability. If any term or other provision of this
Agreement is invalid, illegal or incapable of being enforced by any rule of law
or public policy, all other conditions and provisions of this Agreement shall
nevertheless remain in full force and effect so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
materially adverse to any party. Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties
hereto shall negotiate in good faith to modify this Agreement so as to effect
the original intent of the parties as closely as possible in an acceptable
manner to the end that transactions contemplated hereby are fulfilled to the
extent possible.


                          AGREEMENT AND PLAN OF MERGER

                                      -50-


<PAGE>   56

         SECTION 11.04 Entire Agreement. This Agreement (together with the
Annexes, the Company's Disclosure Letter, the Acquiror's Disclosure Letter and
the Confidentiality Agreement) constitutes the entire agreement of the parties,
and supersedes all prior agreements and undertakings, both written and oral,
among the parties, with respect to the subject matter hereof.

         SECTION 11.05 Assignment. This Agreement shall not be assigned by
operation of Law or otherwise.

         SECTION 11.06 Parties in Interest. This Agreement shall be binding
upon and inure solely to the benefit of each party hereto, and, other than
pursuant to Sections 7.08 and 7.09 hereof, nothing in this Agreement, express
or implied, is intended to or shall confer upon any other Person any right,
benefit or remedy of any nature whatsoever under or by reason of this
Agreement.

         SECTION 11.07 Failure or Indulgence Not Waiver; Remedies Cumulative.
No failure or delay on the part of any party hereto in the exercise of any
right hereunder shall impair such right or be construed to be a waiver of, or
acquiescence in, any breach of any representation, warranty or agreement
herein, nor shall any single or partial exercise of any such right preclude
other or further exercise thereof or of any other right. All rights and
remedies existing under this Agreement are cumulative to, and not exclusive to,
and not exclusive of, any rights or remedies otherwise available.

         SECTION 11.08 Governing Law. This Agreement shall be governed by, and
construed in accordance with, the Laws of the State of Texas, regardless of the
Laws that might otherwise govern under applicable principles of conflicts of
law; provided, however, that any matter involving the internal corporate
affairs of any corporate party hereto shall be governed by the provisions of
the Corporate Statute.

         SECTION 11.09 Arbitration. Any dispute referenced in subsection (g) of
Section 3.01 or subsection (d) of Section 9.02 shall be resolved by binding
arbitration under the Commercial Arbitration Rules (the "AAA Rules") of the
American Arbitration Association (the "AAA"). This arbitration provision is
expressly made pursuant to and shall be governed by the Federal Arbitration
Act, 9 U.S.C. Sections 1-14. The parties hereto agree that, pursuant to Section
9 of the Federal Arbitration Act, a judgment of a United States District Court
of competent jurisdiction shall be entered upon the award made pursuant to the
arbitration. Three arbitrators, who shall have the authority to allocate the
costs of any arbitration initiated under this paragraph, shall be selected
according to the AAA Rules or, if such AAA Rules do not so provide, then in
accordance with the following sentence within ten (10) days of the submission
to the AAA of the response to the statement of claim or the date on which any
such response is due, whichever is earlier. The alternative selection shall be
made as follows: one by a majority in interest of the Designated Company
Stockholders, one by the Acquiror and one by the two so selected. The
arbitrators shall conduct the arbitration in accordance with the Federal Rules
of Evidence. The arbitrators shall decide the amount and extent of pre-hearing
discovery which is appropriate. The arbitrators shall have the power to enter
any award of monetary or injunctive relief (including the power to issue
permanent injunctive relief and also the power to reconsider any prior request
for immediate injunctive relief by either of the parties and any order as to
immediate injunctive relief previously


                          AGREEMENT AND PLAN OF MERGER

                                      -51-

<PAGE>   57

granted or denied by a court in response to a request therefor by either of the
parties), including the power to render an award as provided in Rule 43 of the
AAA Rules; provided, however, that the arbitrators shall not have the power to
award punitive damages under any circumstances (whether styled as punitive,
exemplary, or treble damages, or any penalty or punitive type of damages)
regardless of whether such damages may be available under applicable law, the
parties hereby waiving their rights, if any, to recover any such damages,
whether in arbitration or litigation. The arbitrators shall award the
prevailing party its costs and reasonable attorney's fees, and the losing party
shall bear the entire cost of the arbitration, including the arbitrators' fees.
The arbitration award may be enforced in any court having jurisdiction over the
parties and the subject matter of the arbitration. The arbitration shall be
held in Houston, Texas.

         SECTION 11.10 Counterparts. This Agreement may be executed in multiple
counterparts, and by the different parties hereto in separate counterparts,
each of which when executed shall be deemed to be an original but all of which
taken together shall constitute one and the same agreement.



                          AGREEMENT AND PLAN OF MERGER

                                      -52-

<PAGE>   58
         IN WITNESS WHEREOF, each of the parties hereto has caused this
Agreement to be executed as of the date first written above by their respective
officers thereunto duly authorized.

                                    NATCO GROUP INC.


                                        By:   /s/ NATHANIEL A. GREGORY
                                           ------------------------------------
                                           Name:  Nathaniel A. Gregory
                                           Title: Chairman and Chief Executive
                                                  Officer

                                    NATIONAL TANK COMPANY


                                        By:   /s/ WILLIAM B. WIENER III
                                           ------------------------------------
                                           Name:  William B. Wiener III
                                           Title: Senior Vice President and
                                                  Treasurer

                                    NATCO ACQUISITION COMPANY


                                        By:   /s/ NATHANIEL A. GREGORY
                                           ------------------------------------
                                           Name:  Nathaniel A. Gregory
                                           Title: Chairman and Chief Executive
                                                  Officer


                                    THE CYNARA COMPANY


                                        By:   /s/ RICHARD D. PETERS
                                           ------------------------------------
                                           Name:  Richard D. Peters
                                           Title: President

                                    THE DESIGNATED COMPANY STOCKHOLDERS

                                    /s/ WILLIAM R. DIMELING
                                    -------------------------------------------
                                              William R. Dimeling

                                    /s/ ROBERT J. HAMAKER
                                    -------------------------------------------
                                              Robert J. Hamaker

                                    /s/ DOUGLAS P. HELLER
                                    -------------------------------------------
                                              Douglas P. Heller

                                    /s/ GEORGE K. HICKOX, JR.
                                    -------------------------------------------
                                              George K. Hickox, Jr.


                          AGREEMENT AND PLAN OF MERGER

                                      -53-

<PAGE>   59

                                    /s/ RALPH M. KELLY
                                    -------------------------------------------
                                              Ralph M. Kelly

                                    /s/ STEVEN G. PARK
                                    -------------------------------------------
                                              Steven G. Park

                                    /s/ RICHARD R. SCHREIBER
                                    -------------------------------------------
                                              Richard R. Schreiber

                                    /s/ JOHN C. TUTEN, JR.
                                    -------------------------------------------
                                              John C. Tuten, Jr.


                             THE 1998 TRUST FOR JODY SMITH HAMAKER


                                      By: /s/ JODY SMITH HAMAKER
                                         --------------------------------------
                                      Name: Jody Smith Hamaker
                                           ------------------------------------
                                      Title: Trustee
                                            -----------------------------------


                             BOCP II, L.L.C.


                                      By: /s/ EARLE J. BENSING
                                         --------------------------------------
                                      Name: Earle J. Bensing
                                      Title: Authorized Signer




                          AGREEMENT AND PLAN OF MERGER

                                      -54-

<PAGE>   60

                                                                        ANNEX A


                           SCHEDULE OF DEFINED TERMS

         The following terms when used in the Agreement shall have the meanings
set forth below unless the context shall otherwise require:

         "Acquiror" shall mean NATCO Group Inc., a Delaware corporation, and
its successors from time to time.

         "Acquiror Class A Common Stock" shall mean the Class A Common Stock,
par value $0.01 per share, of the Acquiror, as constituted after the filing of
the Charter Amendment and having the rights, powers and preferences, and
limitations and restrictions thereof attributable to the Class A Common Stock
set forth in the Charter Amendment.

         "Acquiror Class B Common Stock" shall mean the Class B Common Stock,
par value $0.01 per share, of the Acquiror, as constituted after the filing of
the Charter Amendment and having the rights, powers and preferences, and
limitations and restrictions thereof attributable to the Class B Common Stock
set forth in the Charter Amendment.

         "Acquiror Common Stock" shall mean the common stock, par value $0.01
per share, of the Acquiror, as constituted as of the date of this Agreement.
Upon the filing of the Charter Amendment, each share of Acquiror Common Stock
outstanding or reserved for issuance will become a share of Class A Common
Stock.

         "Acquiror Companies" shall have the meaning ascribed to such term in
the first paragraph of this Agreement.

         "Acquiror's Audited Consolidated Financial Statements" shall mean the
consolidated balance sheets of the Acquiror and its Subsidiaries as of March
31, 1996 and the related consolidated statements of operations and cash flows
for the fiscal years ended March 31, 1995 and 1996, together with the notes
thereto, all as audited by KPMG Peat Marwick LLP, independent accountants,
under their report with respect thereto dated June 27, 1997.

         "Acquiror's Consolidated Balance Sheet" shall mean the consolidated
balance sheet of the Acquiror as of December 31, 1997 included in the
Acquiror's Unaudited Consolidated Financial Statements.

         "Acquiror's Consolidated Financial Statements" shall mean the
Acquiror's Audited Consolidated Financial Statements and the Acquiror's
Unaudited Consolidated Financial Statements.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-1

<PAGE>   61

         "Acquiror's Disclosure Letter" shall mean a letter of even date
herewith amending the Acquiror's disclosure letter dated March 26, 1998
delivered by the Acquiror to the Company with the execution of the Agreement,
which, among other things, shall identify exceptions to the Acquiror's
representations and warranties contained in Article V by specific section and
subsection references.

         "Acquiror's Unaudited Consolidated Financial Statements" shall mean
the unaudited consolidated balance sheet of the Acquiror and its Subsidiaries
as of December 31, 1997 and the related consolidated statements of operations
and cash flows for the fiscal quarters ended December 31, 1996 and December 31,
1997, together with the notes thereto.

         "Acquiror Option Plan" shall mean the Acquiror's Non-Employee
Directors Stock Option Plan and the Acquiror's Employee Stock Incentive Plan.

         "Acquiror Stock Options" shall mean stock options granted pursuant to
the Acquiror Option Plans, as well as the individual employee issued otherwise
than pursuant to a plan but that are set forth in Section 5.03(b) of the
Acquiror's Disclosure Letter.

         "Additional Shares" shall mean that number of shares of Acquiror Class
B Common Stock (not less than zero) that is equal to the Sales Revenue
expressed in dollars derived or to be derived from all Awarded Project
Contracts that shall have an Award Date on or prior to March 31, 2000 divided
by $176.06.

         "Affiliate" shall, with respect to any Person, mean any other Person
that controls, is controlled by or is under common control with the former.

         "Agreement" shall mean the Amended and Restated Agreement and Plan of
Merger dated November 17, 1998 but effective as of March 26, 1998 among the
Acquiror, Natco, Newco and the Company, including any amendments thereto and
each Annex (including this Annex A) and Schedule thereto (including the
Acquiror's Disclosure Letter and the Company's Disclosure Letter).

         "Award Date" shall mean the date of receipt of the purchase order or
commitment that, with respect to the definition of Awarded Project Contract,
constitutes an Awarded Project Contract.

         "Awarded Project Contract" shall mean the receipt of (i) a purchase
order related to a Project Contract, (ii) a commitment related to a Project
Contract, e.g., a letter of intent, and work is commenced on the project
substantially in accordance with the schedule contemplated by the commitment;
provided, that a purchase order is subsequently received and accepted or (iii)
a commitment with respect to the design engineering phase of a Project Contract
and work is commenced on the project substantially in accordance with the
schedule contemplated by the commitment; provided, that, in the case of clause
(iii), a purchase order on the remaining phase is received within six months
thereafter.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-2

<PAGE>   62


         "Bank Credit Agreement" shall mean that certain Loan Agreement to be
dated as of November 18, 1998 among, inter alia, the Corporation, as U.S.
Borrower, NATCO Canada, Ltd., as Canadian Borrower, and Chase Bank of Texas,
National Association, as U.S. Agent for the lenders thereunder, Bank of Nova
Scotia, as Canadian Agent for the lenders thereunder, and such lenders, as
amended from time to time.

         "Benefit Plans" shall mean, with respect to a specified Person, any
employee pension benefit plan (whether or not insured), as defined in Section
3(2) of ERISA, any employee welfare benefit plan (whether or not insured) as
defined in Section 3(1) of ERISA, any plans that would be employee pension
benefit plans or employee welfare benefit plans if they were subject to ERISA,
such as foreign plans and plans for directors, any stock bonus, stock
ownership, stock option, stock purchase, stock appreciation rights, phantom
stock or other stock plan (whether qualified or nonqualified), and any bonus or
incentive compensation plan sponsored, maintained, or contributed to by the
specified Person or any of its Subsidiaries for the benefit of any of the
present or former directors, officers, employees, agents, consultants or other
similar representatives providing services to or for the specified Person or
any of its Subsidiaries in connection with such services or any such plans
which have been so sponsored, maintained, or contributed to within six years
prior to the date of this Agreement; provided, however, that such term shall
not include (a) routine employment policies and procedures developed and
applied in the ordinary course of business and consistent with past practice,
including wage, vacation, holiday and sick or other leave policies, (b) workers
compensation insurance and (c) directors and officers liability insurance.

         "Billed Revenues" shall have the meaning ascribed to such term in
Section 3.01(b).

         "BOCP" shall mean Banc One Capital Partners II, LTD as the holder of
the Warrants.

         "Business Day" means any day other than a day on which banks in the
State of Texas are authorized or obligated to be closed;

         "Cap I" shall mean Capricorn Investors, L.P., a Delaware limited
partnership.

         "Cap II" shall mean Capricorn Investors II, L.P., a Delaware limited
partnership.

         "Certificate of Merger" shall have the meaning ascribed to such term
in Section 2.04.

         "Charter Amendment" shall mean an amendment to the Certificate of
Incorporation of the Acquiror substantially similar in form and substance to
the form thereof attached to this Agreement as Annex D, pursuant to which each
share of Acquiror Common Stock outstanding or reserved for issuance will be
converted into a share of Acquiror Class A Common Stock or the right to receive
such a share.

         "Closing" shall mean a meeting, which shall be held in accordance with
Section 3.03, of all Persons interested in the transactions contemplated by the
Agreement at which all documents deemed necessary by the parties to the
Agreement to evidence the fulfillment or waiver of all


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-3


<PAGE>   63

conditions precedent to the consummation of the transactions contemplated by
the Agreement are executed and delivered.

         "Closing Date" shall mean the date of the Closing as determined
pursuant to Section 3.03.

         "Code" shall mean the Internal Revenue Code of 1986, as amended, and
the rules and Regulations promulgated thereunder.

         "Commission" shall mean the Securities and Exchange Commission.

         "Company" shall mean The Cynara Company, a Delaware corporation, and
its successors from time to time.

         "Company Common Stock" shall mean both the Class A common stock, par
value $0.001 per share, and the Class B common stock, par value $0.001 per
share, of the Company.

         "Company Participants" shall have the meaning ascribed to such term in
Section 7.08 herein.

         "Company Stockholders Agreement" shall mean that certain Stockholders
Agreement dated July 1, 1996 by and among the Company, BOCP and the
stockholders of the Company.

         "Company's Audited Consolidated Financial Statements" shall mean the
consolidated balance sheets of the Company and its Subsidiaries as of December
31, 1997 and the related consolidated and combined statements of operations and
cash flows for the fiscal years ended December 31 1996 and December 31, 1997,
together with the notes thereto, all as audited by Ernst & Young LLP,
independent accountants, under their report with respect thereto dated March
11, 1998.

         "Company's Consolidated Balance Sheet" shall mean the consolidated
balance sheet of the Company as of September 30, 1997 included in the Company's
Unaudited Consolidated Financial Statements.

         "Company's Consolidated Financial Statements" shall mean the Company's
Audited Consolidated Financial Statements and the Company's Unaudited
Consolidated Financial Statements.

         "Company's Disclosure Letter" shall mean a letter of even date
herewith amending the Company's disclosure letter dated March 26, 1998 and
delivered by the Company to the Acquiror Companies concurrently with the
execution of the Agreement, which, among other things, shall identify
exceptions to the Company's representations and warranties contained in Article
IV by specific section and subsection references.

         "Company's Unaudited Consolidated Financial Statements" shall mean the
unaudited consolidated balance sheet of the Company and its Subsidiaries as of
September 30, 1997 and the

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-4


<PAGE>   64

related consolidated statements of operations and cash flows for the three
months periods ended September 30, 1996 and September 30, 1997, together with
the notes thereto.

         "Confidentiality Agreement" shall mean that certain confidentiality
agreement between the Acquiror and the Company dated December 11, 1997.

         "Constituent Corporations" shall mean the Company and Natco.

         "control" (including the terms "controlled," "controlled by" and
"under common control with") means the possession, directly or indirectly or as
trustee or executor, of the power to direct or cause the direction of the
management or policies of a Person, whether through the ownership of stock or
as trustee or executor, by contract or credit arrangement or otherwise.

         "Corporate Statute" shall mean the General Corporation Law of the
State of Delaware.

         "Court" shall mean any court or arbitration tribunal of the United
States, any foreign country or any domestic or foreign state, and any political
subdivision thereof.

         "CTOC Earnout Shares" shall mean that number of shares of Class B
Common Stock that shall equal the number obtained by: (i) dividing (A) the
aggregate amount of Billed Revenues, if any, in excess of $20,454,545 by (B)
$1,000; (ii) multiplying the quotient by 22; and (iii) dividing the result by
the number of shares of Company Common Stock outstanding at the Effective Time
(after giving effect to the exercise of the Warrants).

         "CTOC Payout Date" shall mean November 30, 1999.

         "CTOC Project" shall mean any project let to the Company by the
Carigali-Triton Operating Company or any general contractor appointed by the
Carigali-Triton Operating Company.

         "Current Benefit Plans" shall mean Benefit Plans that are sponsored,
maintained, or contributed to by a specified Person or any of its Subsidiaries
as of the date of this Agreement.

         "Designated Company Stockholders" shall mean those holders of Company
Common Stock (including BOCP) who have executed and delivered this Agreement
for the limited purpose of joining in the mutual covenants contained in Article
IX herein and, in the case of BOCP, Section 7.05 and to enforce provisions of
Article IX as contemplated therein and who shall have the right to become a
party to the Registration Rights Agreement pursuant to Sections 6.05 and
8.01(f) herein.

         "Effective Time" shall mean the date and time of the completion of the
filing of the Certificate of Merger with the Secretary of State of the State of
Delaware in accordance with Section 2.02.

         "Environmental Law or Laws" shall mean any and all laws, statutes,
ordinances, rules, regulations, or orders of any Governmental Authority
pertaining to health or the environment


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-5

<PAGE>   65

currently in effect and applicable to a specified Person and its Subsidiaries,
including the Clean Air Act, as amended, the Comprehensive Environmental,
Response, Compensation, and Liability Act of 1980 ("CERCLA"), as amended, the
Federal Water Pollution Control Act, as amended, the Occupational Safety and
Health Act of 1970, as amended, the Resource Conservation and Recovery Act of
1976 ("RCRA"), as amended, the Safe Drinking Water Act, as amended, the Toxic
Substances Control Act, as amended, the Hazardous & Solid Waste Amendments Act
of 1984, as amended, the Superfund Amendments and Reauthorization Act of 1986,
as amended, the Hazardous Materials Transportation Act, as amended, the Oil
Pollution Act of 1990, as amended ("OPA"), any state or local Laws implementing
the foregoing federal Laws, and all other environmental conservation or
protection Laws. For purposes of the Agreement, the terms "hazardous substance"
and "release" have the meanings specified in CERCLA; provided, however, that to
the extent the Laws of the state or locality in which the property is located
establish a meaning for "hazardous substance" or "release" that is broader than
that specified in CERCLA, such broader meaning shall apply within the
jurisdiction of such state or locality, and the term "hazardous substance"
shall include all dehydration and treating wastes, waste (or spilled) oil, and
waste (or spilled) petroleum products, and (to the extent in excess of
background levels) radioactive material, even if such are specifically exempt
from classification as hazardous substances pursuant to CERCLA or RCRA or the
analogous statutes of any jurisdiction applicable to the specified Person or
its Subsidiaries or any of their respective properties or assets.

         "Equity Securities" shall mean, with respect to a specified Person,
any shares of capital stock of, or other equity interests in, or any securities
that are convertible into or exchangeable for any shares of capital stock of,
or other equity interests in, or any outstanding options, warrants or rights of
any kind to acquire any shares of capital stock of, or other equity interests
in, such Person.

         "ERISA" shall mean the Employee Retirement Income Security Act of
1974, as amended, and the Regulations promulgated thereunder.

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, and the Regulations promulgated thereunder.

         "Exchange Fund" shall mean the fund of Acquiror Class B Common Stock
and cash comprising the Merger Consideration Per Share of Company Common Stock
in the aggregate, cash in lieu of fractional share interests and dividends and
distributions, if any, with respect to such shares of Acquiror Class B Common
Stock segregated by the Acquiror pursuant to Section 3.02.

         "Expenses" shall mean all reasonable out-of-pocket expenses (including
all fees and expenses of counsel, accountants, investment bankers, experts and
consultants to a party hereto and its affiliates) incurred by a party or on its
behalf in connection with or related to the authorization, preparation,
negotiation, execution and performance of this Agreement and the Registration
Rights Agreement, the solicitation of stockholder approvals and all other
matters related to the consummation of the transactions contemplated hereby.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-6

<PAGE>   66

         "GAAP" shall mean accounting principles generally accepted in the
United States consistently applied by a specified Person.

         "Governmental Authority" shall mean any governmental agency or
authority (other than a Court) of the United States, any foreign country, or
any domestic or foreign state, and any political subdivision or agency thereof,
and shall include any multinational authority having governmental or
quasi-governmental powers.

         "HSR Act" shall mean the Hart-Scott-Rodino Antitrust Improvements Act
of 1976, as amended, and the Regulations promulgated thereunder.

         "Initial Earnout Shares" shall mean the number of Additional Shares
divided by the number of shares of Company Common Stock outstanding at the
Effective Time (after giving effect to the exercise of the Warrants).

         "Initial Payout Date" shall mean May 31, 2000.

         "Initial Shares" shall mean the shares of Acquiror Class B Common
Stock received by the Designated Company Stockholders pursuant to the Merger as
part of the Merger Consideration payable as of the Effective Date.

         "Investment Agreement" shall mean that certain Investment Agreement
dated as of November 17, 1998 between the Acquiror and Cap II relating to the
purchase by Cap II of a non-negotiable promissory note in the principal amount
of $5,300,000 convertible into 504,762 shares of Class A Common Stock upon the
occurrence of the events therein described.

         "IRS" shall mean the Internal Revenue Service.

         "Knowledge" shall mean, with respect to either the Company or the
Acquiror, the knowledge (obtained after reasonable inquiry) of any executive
officer of such party.

         "Law" shall mean all laws, statutes, ordinances and Regulations of the
United States, any foreign country, or any domestic or foreign state, and any
political subdivision or agency thereof, including all decisions of Courts
having the effect of law in each such jurisdiction.

         "Lien" shall mean any mortgage, pledge, security interest,
encumbrance, lien or charge of any kind (including any agreement to give any of
the foregoing), any conditional sale or other title retention agreement, any
lease in the nature thereof or the filing of or agreement to give any financing
statement under the Uniform Commercial Code of any jurisdiction.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-7

<PAGE>   67

         "Material" shall mean material to the condition (financial and other),
results of operations or business of a specified Person and its Subsidiaries,
if any, taken as a whole; provided, however, that, as used in this definition
the word "material" shall have the meaning accorded thereto in Section 11 of
the Securities Act.

         "Material Adverse Effect" shall mean any change or effect that would
be material and adverse to the consolidated business, condition (financial or
otherwise), operations, performance or properties (but excluding any
outstanding capital stock or other securities) of a specified Person and its
Subsidiaries, if any, taken as a whole; provided, however, that, as used in
this definition the word "material" shall have the meaning accorded thereto in
Section 11 of the Securities Act. Notwithstanding anything herein to the
contrary, if the Company is not awarded any Project Contract in Southeast Asia,
such circumstance shall not constitute a Material Adverse Effect on the
Company.

         "Material Contract" shall mean each contract, lease, indenture,
agreement, arrangement or understanding to which a specified Person or any of
its Subsidiaries is a party or to which any of the assets or operations of such
specified Person or any of its Subsidiaries is subject that is of a type that
would be required to be included as an exhibit to a registration statement on
Form S-1 pursuant to Paragraph (2), (4), (10) or (14) of Item 601(b) of
Regulation S-K under the Securities Act if such a registration statement were
to be filed by such Person under the Securities Act on the date of
determination. Notwithstanding the foregoing, such term shall, in the case of
the Company, include any of the following contracts, agreements or commitments,
whether oral or written:

                  (1) Any collective bargaining agreement or other agreement
         with any labor union;

                  (2) any agreement, contract or commitment with any other
         Person, other than any agency or representation entered in the
         ordinary course of business, containing any covenant limiting the
         freedom of such specified Person or any of its Subsidiaries to engage
         in any line of business or to compete with any other Person;

                  (3) any partnership, joint venture or profit sharing
         agreement with any Person, which partnership, joint venture or profit
         sharing agreement generated revenues during its most recently
         completed fiscal year of $100,000 or more;

                  (4) any employment or consulting agreement, contract or
         commitment between the Company or any of its Subsidiaries and any
         employee, officer or director thereof (i) having more than one year to
         run from the date hereof, (ii) providing for an obligation to pay or
         accrue compensation of $100,000 or more per annum or (iii) providing
         for the payment or accrual of any additional compensation upon a
         change in control of such Person or any of its Subsidiaries or upon
         any termination of such employment or consulting relationship
         following a change in control of such Person or any of its
         Subsidiaries; and


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-8

<PAGE>   68

                  (5) any agency or representation agreement with any Person
         which is not terminable by the Company or one of its Subsidiaries
         without penalty upon not more than one year's notice;

         "Merger" shall mean the merger of the Company with and into Natco as
provided in Article II of this Agreement.

         "Merger Consideration" shall mean the aggregate Merger Consideration
Per Share of Company Common Stock payable pursuant to Section 3.01 herein with
respect to a specific number of shares of Company Common Stock.

         "Merger Consideration Per Share of Company Common Stock" shall mean
the number of shares of Acquiror Class B Common Stock, the right to receive an
amount of cash, the right to receive the CTOC Earnout Shares and the right to
receive the Initial Earnout Shares and the Supplemental Earnout Shares into
which each share of Company Common Stock is to be converted pursuant to the
Merger as provided in Section 3.01(a).

         "NASD" shall mean the National Association of Securities Dealers, Inc.

         "Natco" shall mean National Tank Company, a Delaware corporation and a
wholly-owned Subsidiary of the Acquiror.

         "Newco" shall mean Natco Acquisition Company, a Delaware corporation
and a wholly-owned Subsidiary of the Acquiror.

         "NYSE" shall mean the New York Stock Exchange, Inc.

         "Order" shall mean any judgment, order or decree of any Court or
Governmental Authority, federal, foreign, state or local.

         "Payout Date" shall mean May 31, 2001.

         "PBGC" shall mean the Pension Benefit Guaranty Corporation.

         "Permit" shall mean any and all permits, licenses, authorizations,
orders, certificates, registrations or other approvals granted by any
Governmental Authority.

         "Permitted Encumbrances" shall mean the following:

                  (1) liens for taxes, assessments and other governmental
         charges not delinquent or which are currently being contested in good
         faith by appropriate proceedings; provided that, in the latter case,
         the specified Person or one of its Subsidiaries shall have set aside
         on its books adequate reserves with respect thereto;


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-9


<PAGE>   69

                  (2) mechanics' and materialmen's liens not filed of record
         and similar charges not delinquent or which are filed of record but
         are being contested in good faith by appropriate proceedings; provided
         that, in the latter case, the specified Person or one of its
         Subsidiaries shall have set aside on its books adequate reserves with
         respect thereto;

                  (3) liens in respect of judgments or awards with respect to
         which the specified Person or one of its Subsidiaries shall in good
         faith currently be prosecuting an appeal or other proceeding for
         review and with respect to which such Person or such Subsidiary shall
         have secured a stay of execution pending such appeal or such
         proceeding for review; provided that, such Person or such Subsidiary
         shall have set aside on its books adequate reserves with respect
         thereto;

                  (4) easements, leases, reservations or other rights of others
         in, or minor defects and irregularities in title to, property or
         assets of a specified Person or any of its Subsidiaries; provided
         that, such easements, leases, reservations, rights, defects or
         irregularities do not materially impair the use of such property or
         assets for the purposes for which they are held; and

                  (5) any lien or privilege vested in any lessor, licensor or
         permittor for rent or other obligations of a specified Person or any
         of its Subsidiaries thereunder so long as the payment of such rent or
         the performance of such obligations is not delinquent.

                  (6) the Lien of Banc One, Texas, N.A. on all assets of the
         Company.

         "Person" shall mean an individual, partnership, limited liability
company, corporation, joint stock company, trust, estate, joint venture,
association or unincorporated organization, or any other form of business or
professional entity, but shall not include a Governmental Authority.

         "Project Contract" shall mean a contract to supply a new membrane
system, including all or part of the responsibilities for design, manufacture,
delivery and startup of membranes and related equipment, where the destination
of such membrane system is Southeast Asia; provided, however, that the long
term service and parts contracts awarded with respect to any project contract
included within this definition shall be limited to a duration of the first
three years of the contract term, i.e., the revenues attributable to such a
long term service and parts contract for purposes of the Agreement shall be
limited to the revenues earned or to be earned during the first three years of
such contract.

         "Registration Rights Agreement" shall mean an agreement among the
Acquiror and the Designated Company Stockholders pursuant to which the Acquiror
agrees to provide rights of registration of the offering, sale and delivery of
shares of Acquiror Common Stock under the registration provisions of the
Securities Act which shall be in form and substance substantially similar to
the form thereof attached hereto as Annex E.



                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-10

<PAGE>   70

         "Regulation" shall mean any rule or regulation of any Governmental
Authority having the effect of law.

         "Reports" shall mean, with respect to a specified Person, all reports,
registrations, filings and other documents and instruments required to be filed
by the specified Person or any of its Subsidiaries with any Governmental
Authority.

         "Representative" shall mean, initially, Douglas P. Heller, or any
successor individual designated at any time by notice to the Acquiror signed by
a majority in interest of the Designated Company Stockholders (determined at
the time by reference to the holdings of Company Common Stock of each of the
Designated Company Stockholders immediately prior to the Effective Time after
giving effect to the exercise of the Warrants).

         "Sales Revenue" shall mean the gross sales revenue attributable to an
Awarded Project Contract in accordance with the provisions of the Project
Contract, whether earned or to be earned in accordance therewith. Except as
heretofore provided in this definition, Sales Revenue shall be determined in
accordance with GAAP and the sales revenue for any component of the Project
Contract for which the sales revenue was not expressly provided in the Project
Contract shall be estimated on a reasonable basis taking into account
experience regarding similar Project Contracts.

         "Securities Act" shall mean the Securities Act of 1933, as amended,
and the Regulations promulgated thereunder.

         "Share Adjustment" shall have the meaning ascribed to such term in
subsection (a) of Section 3.01.

         "Significant Subsidiary" means any Subsidiary of the Company or
Acquiror, as the case may be, that would constitute a Significant Subsidiary of
such party within the meaning of Rule 1-02 of Regulation S-X of the Commission.

         "Southeast Asia" shall mean the countries and territorial waters
included in the area bounded by and including Australia to the south, the
Philippines to the east, China to the north and Pakistan to the west.

         "Stockholders" shall mean Capricorn Investors, Ltd., a Delaware
limited partnership, and Capricorn Investors II, Ltd., a Delaware limited
partnership.

         "Stockholders' Agreement" shall mean an agreement among the Acquiror,
Cap I, Cap II and the Designated Company Stockholders in form and substance
substantially similar to the form thereof attached hereto as Annex F.

         A "Subsidiary" of a specified Person shall be any corporation,
partnership, limited liability company, joint venture or other legal entity of
which the specified Person (either alone or through or together with any other
Subsidiary) owns, directly or indirectly, 50 percent or more of the stock



                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-11

<PAGE>   71

or other equity or partnership interests the holders of which are generally
entitled to vote for the election of the board of directors or other governing
body of such corporation or other legal entity.

         "Stockholder's Letter" shall mean a letter in form and substance
substantially similar to the form thereof attached hereto as Annex B.

         "Stockholders' Meeting" shall have the meaning ascribed to such term
in Subsection 7.01(a).

         "Supplemental Earnout Shares" shall mean the number of Supplemental
Shares divided by the number of shares of Company Common Stock outstanding at
the Effective Time (after giving effect to the exercise of the Warrants).

         "Supplemental Payout Date" shall mean February 28, 2001.

         "Supplemental Shares" shall mean that number of shares of Acquiror
Class B Common Stock (not less than zero) that is equal to the Sales Revenue
expressed in dollars derived or to be derived from all Awarded Project
Contracts that shall have an Award Date after March 31, 2000 and on or prior to
December 31, 2000 (less any unearned Sales Revenue attributed to Awarded
Project Contracts included in the determination of Initial Earnout Shares but
subsequently cancelled) divided by $352.11.

         "Surviving Corporation" shall mean Natco as the corporation surviving
the Merger.

         "Tax Returns" shall mean all returns and reports of or with respect to
any Tax which are required to be filed by or with respect to the Company or any
of its Subsidiaries.

         "Taxes" shall mean all taxes, charges, imposts, tariffs, fees, levies
or other similar assessments or liabilities, including income taxes, ad valorem
taxes, excise taxes, withholding taxes, stamp taxes or other taxes of or with
respect to gross receipts, premiums, real property, personal property, windfall
profits, sales, use, transfers, licensing, employment, payroll and franchises
imposed by or under any Law; and such terms shall include any interest, fines,
penalties, assessments or additions to tax resulting from, attributable to or
incurred in connection with any such tax or any contest or dispute thereof.

         "Terminated Benefit Plans" shall mean Benefit Plans that were
sponsored, maintained, or contributed to by a specified Person or any of its
Subsidiaries within six years prior to the date of this Agreement but which
have been terminated prior to the date of this Agreement.

         "Warrants" shall mean those certain warrants to purchase Company
Common Stock issued by the Company and those options granted by stockholders of
the Company, in each case held by BOCP as described in Section 4.03(b) of the
Company's Disclosure Letter.



                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX A-12

<PAGE>   72

                                                                        ANNEX B

                              STOCKHOLDER'S LETTER

                                     [Date]


NATCO Group Inc.
Brookhollow Central III
2950 North Loop West, Suite 750
Houston, Texas 77092

Ladies and Gentlemen:

         The undersigned is a holder of Class A Common Stock of The Cynara
Company, a Delaware corporation (the "Company"). Pursuant to the terms and
subject to the conditions of that certain Agreement and Plan of Merger by and
among NATCO Group Inc., a Delaware corporation (the "Acquiror"), Natco
Acquisition Company, a newly formed Delaware corporation and a wholly owned
Subsidiary of the Acquiror ("Natco"), and the Company dated as of March __,
1998 (the "Merger Agreement"), providing for, among other things, the merger of
the Company with and into Natco (the "Merger"), the undersigned will be
entitled to receive shares of Acquiror Class B Common Stock in exchange for
shares of Company Common Stock owned by the undersigned at the Effective Time
of the Merger as determined pursuant to the Merger Agreement. Capitalized terms
used but not defined herein are defined in Annex A to the Merger Agreement and
are used herein with the same meanings as ascribed to them therein.

         The undersigned hereby represents that the undersigned is the
beneficial owner of the shares of Company Common Stock of which it is the
record owner on the stock record books of the Company as of the date hereof and
is an "accredited investor" within the meaning of such term as defined in Rule
501 of the General Rules and Regulations under the Securities Act. The
undersigned acknowledges receipt of a draft dated March ___, 1998 of a
Registration Statement on Form S-1 of NATCO Group Inc. to be filed with the
Commission under the Securities Act.

         The undersigned has been advised that the offering, sale and delivery
of the shares of Acquiror Class B Common Stock to be received by the
undersigned pursuant to the Merger will not have been registered with the
Commission under the Securities Act and that, therefore, such shares of
Acquiror Class B Common Stock may not be resold by the undersigned unless the
offering, sale and delivery of such shares are so registered under the
Securities Act or an exemption from such registration is available. In that
regard, the undersigned represents that the undersigned is acquiring the shares
of Acquiror Class B Common Stock to be received by the undersigned pursuant to
the Merger without a view to the distribution thereof within the meaning of
such term as used in the Securities Act and Rule 144 of the General Rules and
Regulations thereunder.

         The undersigned understands that instructions will be given to the
transfer agent for the Acquiror Class B Common Stock with respect to the
Acquiror Class B Common Stock to be received by the undersigned pursuant to the
Merger and that there will be placed on the certificates


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX B-1

<PAGE>   73

representing such shares of Acquiror Class B Common Stock, or any substitutions
therefor, a legend stating in substance as follows:

         "These shares were issued in a transaction in which the offering, sale
         and delivery thereof were not registered under the Securities Act of
         1933, as amended, in reliance on an exemption from such registration
         requirement. These shares may only be sold or otherwise transferred in
         a transaction in which the offering, sale and delivery thereof are
         registered under such Act or for which an exemption from such
         registration requirement is provided by such Act.

It is understood and agreed that the legend set forth above shall be removed
upon surrender of certificates bearing such legend by delivery of substitute
certificates without such legend if the undersigned shall have delivered to the
Acquiror an opinion of counsel, in form and substance reasonably satisfactory
to the Acquiror, to the effect that (i) the sale or disposition of the shares
represented by the surrendered certificates may be effected without
registration of the offering, sale and delivery of such shares under the
Securities Act and (ii) the shares to be so transferred may be publicly
offered, sold and delivered by the transferee thereof without compliance with
the registration provisions of the Securities Act.

         By its execution hereof, the Acquiror agrees that it will, from and
after the Effective Time of the Merger and for so long as the undersigned owns
any shares of Acquiror Class B Common Stock to be received by the undersigned
pursuant to the Merger that are subject to the restrictions on sale, transfer
or other disposition herein set forth, take all reasonable efforts to make
timely filings with the Commission of all reports required to be filed by it
pursuant to the Exchange Act and will promptly furnish upon written request of
the undersigned a written statement confirming that such reports have been so
timely filed.

         If you are in agreement with the foregoing, please so indicate by
signing below and returning a copy of this letter to the undersigned, at which
time this letter shall become a binding agreement between us.

                                  Very truly yours,

                                  By:
                                     ------------------------------------------
                                     Name:
                                     Title:
                                     Date:
                                     Address:

ACCEPTED this ___ day
of __________, 1998

NATCO Group Inc.

By:
   Name:
   Title:


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX B-2

<PAGE>   74
                                                                         ANNEX C

                                ESCROW AGREEMENT


         This Escrow Agreement, dated as of November 18, 1998, between NATCO
Group, Inc., a Delaware corporation (the "Acquiror") the Designated Company
Stockholders named on the signature page hereto and, Douglas P. Heller or any
successor as Representative (the "Representative", sometimes referred to
collectively as "Escrow Parties"), and Chase Bank of Texas, National
Association, a national banking association ("Escrow Agent");

                             W I T N E S S E T H :

         WHEREAS, the Acquiror, National Tank Company, a Delaware company and a
direct, wholly-owned subsidiary of the Acquiror ("Natco"), Natco Acquisition
Company, a Delaware corporation and a wholly owned subsidiary of the Acquiror,
and The Cynara Company, a Delaware corporation (the "Company") have entered
into an Amended and Restated Agreement and Plan of Merger dated November 17,
1998 but effective as of March 26, 1998, (the "Merger Agreement"), which
provides, among other things, for the merger (the "Merger") of the Company with
and into Natco, with the result that the separate corporate existence of the
Company shall cease and Natco shall continue as the Surviving Corporation; and

         WHEREAS, the parties hereto desire, pursuant to Section 7.10 of the
Merger Agreement, to set aside a portion of the consideration to be paid to the
Designated Company Stockholders in connection with the Merger for the purpose
of establishing a reserve of Escrow Shares (as defined in Section 7.10 of the
Merger Agreement) for disposition in accordance with the provisions of that
Section of the Merger Agreement;

         WHEREAS, Escrow Agent has agreed to hold the Escrow Shares in
accordance with the terms and provisions contained herein;

         NOW, THEREFORE, in consideration of the premises and of other good and
valuable consideration, the parties hereto hereby agree as follows:

         1. Definitions. Capitalized terms used but not defined herein shall
have the meanings assigned to such terms in the Merger Agreement.

         2. Appointment of Escrow Agent. The Acquiror and the Designated
Company Stockholders hereby designate and appoint Chase Bank of Texas, National
Association, as Escrow Agent for the purposes set forth herein, and the Escrow
Agent hereby accepts such appointment on the terms herein provided. In
addition, the Acquiror and the Representative hereby deliver to the Escrow
Agent a fully executed copy of the Merger Agreement.

         3. Deposit of Escrow Shares. In conjunction with the Closing and
promptly after the Effective Time, the Acquiror shall deliver to the Escrow
Agent one or more certificates totaling 450,000 shares of Natco registered in
the names of the various Designated Company Stockholders representing the
Escrow Shares, together with stock powers duly executed in blank. Any and all


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX C-1

<PAGE>   75
dividends and distributions declared and paid or made with respect to the
Escrow Shares shall be delivered to the Designated Company Stockholders. Any
and all shares of capital stock, other securities, cash or other property into
which the Escrow Shares may from time to time in whole or in part be converted
or for which they may in whole or in part be exchanged shall be delivered to
the Escrow Agent and deposited into escrow. The aggregate of all such Escrow
Shares, shares of capital stock, other securities, cash and other property is
herein referred to as the "Escrow Fund". The Escrow Agent will invest and
reinvest any cash portion of the Escrow Fund and any interest or other amounts
earned thereon, in the Fidelity Treasury Money Market Fund #77 unless otherwise
instructed in writing by the Escrow Parties. Unless Escrow Agent is otherwise
directed in such written instructions, Escrow Agent may use a broker-dealer of
its own selection, including a broker-dealer owned by or affiliated with Escrow
Agent or any of its affiliates. It is expressly agreed and understood by the
parties hereto that Escrow Agent shall not in any way whatsoever be liable for
losses on any investments, including, but not limited to, losses from market
risks due to premature liquidation or resulting from other action taken
pursuant to this Escrow Agreement.

         4. Maintenance and Distribution of Escrow. The Escrow Agent shall hold
the Escrow Shares in escrow and shall maintain and distribute the Escrow Shares
solely in accordance with written instructions signed on behalf of the Acquiror
by a duly authorized officer and on behalf of the Designated Company
Stockholders by the Representative.

         5. Performance and Reliance by Escrow Agent; Liability of Escrow
Agent. The Escrow Agent undertakes to perform such duties as are set forth in
this Escrow Agreement and shall be protected in acting upon any written notice,
request, waiver, consent, certificate, receipt, authorization or other paper or
document that the Escrow Agent believes to be genuine. The Escrow Agent may
confer with its own corporate or outside legal counsel in the event of any
dispute or question as to the construction of any of the provisions hereof, or
its duties hereunder, and shall incur no liability and shall be fully protected
in acting in accordance with the written opinions of such counsel. The duties
of the Escrow Agent hereunder will be limited to the observance of the express
provisions of this Escrow Agreement. The Escrow Agent will not be subject to,
or be obliged to recognize, any other agreement between the parties hereto or
directions or instructions not specifically set forth as provided for herein,
except for such directions as appear in this Escrow Agreement. The Escrow Agent
will not make any payment or disbursement from or out of the Escrow Fund that
is not expressly authorized pursuant to this Escrow Agreement.

         6. Liability of Escrow Agent. The Escrow Agent may rely upon and act
upon any instrument received by it pursuant to the provisions of this Escrow
Agreement that it reasonably believes to be genuine and in conformity with the
requirements of this Escrow Agreement. The Escrow Agent undertakes to use the
same degree of care and skill in performing its services hereunder as an
ordinary prudent person would do or use under the circumstances in the conduct
of his or her own affairs. The Escrow Agent will not be liable for any action
taken or not taken by it under the terms hereof in the absence of breach of its
obligations hereunder or gross negligence, willful misconduct or willful breach
of this Escrow Agreement on its part. In no event shall Escrow Agent be liable
for any lost profits, lost savings or other special, exemplary, consequential
or incidental damages in excess of Escrow Agent's fee hereunder and provided,
further, that Escrow Agent shall have no liability for any loss arising from
any cause beyond its control, including without limitation the following: (a)
acts of God, force majeure, including, without limitation, war (whether


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX C-2

<PAGE>   76
or not declared or existing), revolution, insurrection, riot, civil commotion,
accident, fire, explosion, stoppage of labor, strikes and other differences
with employees; (b) the act, failure or neglect of any other party or any agent
or correspondent or any other person selected by Escrow Agent; (c) any delay,
error, omission or default of any mail, courier, telegraph, cable or wireless
agency or operator; or (d) the acts or edicts of any government or governmental
agency or other group or entity exercising governmental powers.

         7. Termination of Escrow. This Escrow Agreement shall terminate upon
release of all of the Escrow Shares and Escrow Fund in accordance with the
provisions of this Escrow Agreement; provided, however that in the event all
fees, expenses, costs and other amounts required to be paid to Escrow Agent
hereunder are not fully paid prior to termination, the Escrow Agent shall be
entitled to pay and set off from the Escrow Fund prior to the release of the
Escrow Shares and Escrow Fund. Upon release by the Escrow Agent of all of the
Escrow Shares and Escrow Fund as provided therein, the duties of the Escrow
Agent shall be completed, and the Escrow Agent shall have no further
obligations under this Escrow Agreement to any other party. Section 8 shall
survive termination hereof.

         8. Indemnification of Escrow Agent. The Acquiror and the Designated
Company Stockholders shall, jointly and severally, indemnify and hold the
Escrow Agent harmless from and against any and all losses, costs, damages or
expenses (including without limitation reasonable attorneys' fees) it may
sustain by reason of its service as Escrow Agent hereunder, except such losses,
costs, damages or expenses (including without limitation reasonable attorneys'
fees) incurred by reason of such acts or omissions for which the Escrow Agent
is liable or responsible under the last sentence of Section 6 hereof. As
between the Acquiror and the Designated Company Stockholders, however, all such
losses, costs, damages and expenses (including attorneys' fees) shall be borne
by the Acquiror and the Designated Company Stockholders on the basis of 50%
each.

         9. Release of Representative; Successor Representative. In
consideration of Douglas P. Heller (and any successor) acting as the
Representative hereunder on behalf of all Designated Company Stockholders, each
such Designated Company Stockholder, by accepting shares of Class B Common
Stock pursuant to Section 3.01 and Section 7.10 of the Merger Agreement and by
becoming a beneficiary of this Escrow Agreement, releases the Representative
from liability for any action taken or not taken by the Representative under
the terms hereof in the absence of the Representative's gross negligence or
willful misconduct. If Douglas P. Heller ceases to act as the Representative
for any reason or Douglas P. Heller or his representative shall notify the
Acquiror and the Escrow Agent of the Representative's intent to resign as
Representative, then a majority in interest of the Designated Company
Stockholders (as determined at the time by reference to the holdings of Company
Common Stock of each of the Designated Company Stockholders immediately prior
to the Effective Time after giving effect to the exercise of the Warrants) may
designate by notice to the Acquiror a successor Representative. If no such
successor is appointed within 30 days, then Acquiror shall appoint an
independent third party as successor.

         10. Fees and Expenses of the Escrow Agent. All fees of the Escrow
Agent for its services hereunder, together with any expenses reasonably
incurred by the Escrow Agent in connection with this Escrow Agreement, shall be
paid by Acquiror in accordance with the Escrow Agent's fee

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX C-3

<PAGE>   77
schedule in effect. The Acquiror shall promptly pay to the Designated Company
Stockholders any amounts set off against the Escrow Fund pursuant to Section 7
hereof.

         11. Resignation of Escrow Agent. The Escrow Agent may resign from its
duties hereunder by giving each of the parties hereto not less than 60 days
prior written notice of the effective date of such resignation. The parties
hereto intend that a substitute Escrow Agent will be appointed by the Acquiror
to fulfill the duties of the Escrow Agent hereunder for the remaining term of
this Escrow Agreement in the event of the Escrow Agent's resignation. If on or
before the effective date of such resignation, a substitute Escrow Agent has
not been appointed, the Escrow Agent will thereupon deposit the Escrow Shares
into the registry of a court of competent jurisdiction.

         12. Designees for Instructions. The Escrow Parties are hereby
designated as the persons who will execute notices and from whom the Escrow
Agent may take instructions hereunder. Such designation may be changed from
time to time upon notice to the Escrow Agent from the Acquiror in the case of
the Acquiror and from the Representative in the case of the Designated Company
Stockholders. The Escrow Agent will be entitled to rely conclusively on any
notices or instructions from the Escrow Parties that the Escrow Agent believes
to be genuine. If the Acquiror or the Representative changes its designees
hereunder and notifies the Escrow Agent of such change, the Escrow Agent will
be entitled to rely conclusively on any notice or instructions from any such
successor designees so designated.

         13. Notices. Any notices, consents, demands, requests, approvals and
other communications to be given under this Escrow Agreement by any party to
any other party shall be in writing and shall be either (a) personally
delivered, (b) mailed by registered or certified mail, postage prepaid with
return receipt requested, (c) delivered by overnight express delivery service
or same-day local courier service, or (d) delivered by facsimile transmission,
to the address set forth below, or to such other address as may be designated
by such party from time to time in accordance with this Section. Notices
delivered personally, by overnight express delivery service or by local courier
service shall be deemed given as of actual receipt. Mailed notices shall be
deemed given three business days after mailing. Notices delivered by facsimile
transmission shall be deemed given upon receipt by the sender of the
transmission confirmation.

             (a)      If to the Acquiror:     NATCO Group Inc.
                                              Brookhollow Central III, Suite 750
                                              2950 N. Loop West
                                              Houston, Texas  77092
                                              Attn:  William B. Wiener III
                                              Telecopy No.: (713) 683-7841

                      with a copy to:         Vinson & Elkins L.L.P.
                                              1001 Fannin, Suite 2300
                                              Houston, Texas  77002
                                              Attn:  William E. Joor III
                                              Telecopy No.:  (713) 758-2346


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX C-4


<PAGE>   78
             (b) If to the Escrow Agent:   Chase Bank of Texas, National
                                            Association
                                           600 Travis Street, Suite 1150
                                           Houston, Texas
                                           Attn: May Ng
                                           Telecopy No.: (713)216-6467

             (c) If to the Representative: Douglas P. Heller
                                           Heller, Hickox, Dimeling, Schrieber
                                           1629 Locust Street
                                           Philadelphia, Pennsylvania  19103
                                           Telecopy No.:  (215) 546-1041

                 with a copy to:           Reed, Smith, Shaw & McClay
                                           2500 One Liberty Place
                                           Philadelphia, Pennsylvania  19103
                                           Attn:  Lori L. Lasher
                                           Telecopy No.:  (215) 851-1420

         14. Binding Effect. This Escrow Agreement will be binding upon and
inure to the benefit of the parties hereto and their permitted assigns. The
rights of any person or entity to receive Escrow Shares hereunder shall not be
transferable except by operation of law.

         15. Amendment and Termination. This Escrow Agreement or any provision
hereof may be amended, modified, waived or terminated only by written
instrument duly signed by the parties hereto.

         16. Applicable Law. This Escrow Agreement will be governed by and
construed in accordance with the laws of the State of Texas, without giving
effect to conflicts of law principles.

         17. Counterparts. This Escrow Agreement may be executed in one or more
counterparts, each of which will be deemed an original, but all of which
together will constitute but one and the same instrument.

         18. Captions and Paragraph Headings. Captions and paragraph headings
used herein are for convenience only and are not part of this Escrow Agreement
and will not be used in construing it.

         19. Arbitration. Any and all claims, demands, causes of action,
disputes, controversies and other matters in question arising out of or
relating to this Escrow Agreement, the alleged breach thereof, or in any way
relating to the subject matter of this Agreement ("Disputes"), even though some
or all of such Disputes allegedly are extra contractual in nature, whether such
Disputes sound in contract, tort or otherwise, at law or in equity, under state
or federal law, whether provided by statute or the common law, for damages or
any other relief, shall be resolved and decided exclusively by binding
arbitration pursuant to the Federal Arbitration Act in accordance with the
Commercial Arbitration Rules then in effect with the American Arbitration
Association. The arbitration proceeding shall be conducted in Houston, Texas.
The arbitration shall be before a panel of three

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX C-5

<PAGE>   79
arbitrators. The Acquiror and the Representative shall each select one
arbitrator and the two arbitrators so selected shall select the third
arbitrator. The arbitrators are authorized to issue subpoenas for depositions
and other discovery mechanisms, as well as trial subpoenas, in accordance with
the Federal Rules of Civil Procedure. Any party may initiate a proceeding in
the appropriate United States District Court to enforce this provision. This
agreement to arbitrate shall be enforceable in either federal or state court.
Judgment upon any award rendered in any such arbitration proceeding may be
entered by any federal or state court having jurisdiction. The enforcement of
this agreement to arbitrate and all procedural aspects of this agreement to
arbitrate, including the construction and interpretation of this agreement to
arbitrate, the scope of the arbitrable issues, allegations of waiver, delay or
defenses to arbitrability, and the rules governing the conduct of the
arbitration, shall be governed by and construed pursuant to the Federal
Arbitration Act. The arbitrators shall have no authority to award punitive
damages (including, without limitation, any exemplary damages, treble damages
or any other penalty or punitive type of damages), under any circumstances
regardless of whether such damages in excess of such amount may be available
under applicable law or otherwise, the parties hereto hereby waiving their
right, if any, to recover such damages in excess of such amount in connection
with any Disputes. The costs of the arbitration shall be allocated to the
Acquiror and to the Designated Company Stockholders in the amount of 50% each.
All other costs and expenses incurred by a party to any arbitration proceeding
hereunder shall be borne by such party. The Escrow Parties shall jointly
instruct the Escrow Agent with respect to all actions to be taken as a result
of any arbitration award.

         20. Action by the Acquiror. As between the Acquiror and the Designated
Company Stockholders, all actions to be taken by the Acquiror hereunder shall
be taken by, or pursuant to authority granted by, a committee of the Board of
Directors of the Acquiror comprised of one or more members who were not prior
to the Effective Time affiliated with the Company or affiliates of the Company
and who are not Designated Company Stockholders.

         21. Tax Reporting. Unless otherwise required by Treasury Regulations
issued in the future, the parties will treat the Escrow Shares for purposes of
Section 468B(g) of the Internal Revenue Code of 1986, as amended, and for all
other income tax and general corporate purposes as being owned by the
Designated Company Stockholders during the period such shares are held in
Escrow, and therefore any income earned on such shares during such period will
be allocated and reported to the Designated Company Stockholders as such income
is earned. The parties will make any elections or filings required to
characterize such shares in a manner consistent with the preceding sentence.

         23. Accounting Provisions. The Escrow Shares subject to this Escrow
Agreement shall appear as issued and outstanding on the balance sheet of
Acquiror and such Escrow Shares shall be legally outstanding under applicable
state law.

         24. Dividends. All dividends payable on the Escrow Shares during the
period such shares are held in escrow shall be distributed currently to the
Designated Company Stockholders.

         25. Voting Rights. All voting rights of the Escrow Shares shall be
exercisable by or on behalf of the Designated Company Stockholders or their
authorized Agent.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX C-6

<PAGE>   80
         IN WITNESS WHEREOF, the parties hereto have caused this Escrow
Agreement to be executed by their respective officers hereunto duly authorized,
as of the day and year first above written.

                                NATCO GROUP INC.


                                    By:
                                       --------------------------------------
                                    Name:
                                         ------------------------------------
                                    Title:
                                          -----------------------------------

                                REPRESENTATIVE


                                    -----------------------------------------
                                    Name:  Douglas P. Heller


                                THE DESIGNATED COMPANY STOCKHOLDERS


                                ---------------------------------------------
                                    William R. Dimeling


                                ---------------------------------------------
                                    Robert J. Hamaker


                                ---------------------------------------------
                                    Douglas P. Heller


                                ---------------------------------------------
                                    George K. Hickox, Jr.


                                ---------------------------------------------
                                    Ralph M. Kelly


                                ---------------------------------------------
                                    Steven G. Park


                                ---------------------------------------------
                                    Richard R. Schreiber


                                ---------------------------------------------
                                    John C. Tuten, Jr.



                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX C-7

<PAGE>   81
                                THE 1998 TRUST FOR JODY SMITH HAMAKER


                                    By:
                                       --------------------------------------
                                    Name:
                                         ------------------------------------
                                    Title:
                                          -----------------------------------


                                BOCP II, L.L.C.



                                By:
                                   ------------------------------------------
                                Name:  Earle J. Bensing
                                Title:    Authorized Signer


                                CHASE BANK OF TEXAS, NATIONAL
                                         ASSOCIATION


                                    By:
                                       --------------------------------------
                                    Name:
                                         ------------------------------------
                                    Title:
                                          -----------------------------------




                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX C-8
<PAGE>   82
                                                                         ANNEX D

                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                                NATCO GROUP INC.


         THE UNDERSIGNED SENIOR VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
OF NATCO GROUP INC., A DELAWARE CORPORATION (THE "CORPORATION"), DOES
HEREBY CERTIFY:

         I. That the Board of Directors of the Corporation adopted at a meeting
duly called and held resolutions setting forth proposed amendments of the
Certificate of Incorporation of the Corporation, approving such amendments,
declaring such amendments advisable and recommending such amendments to the
stockholders of the Corporation for approval thereof. The resolutions setting
forth the proposed amendments are as follows:

         RESOLVED, that the first paragraph of Article Fourth of the
Certificate of Incorporation of the Corporation be amended so as to be and read
in its entirety as follows:

                  FOURTH: The aggregate number of shares of capital stock that
         the Corporation shall have authority to issue is 55,000,000 shares, of
         which 5,000,000 shall be shares of Preferred Stock, par value $.01 per
         share ("Preferred Stock"), and 50,000,000 shall be shares of Common
         Stock, par value of $.01 per share ("Common Stock"), divided into
         45,000,000 shares of Class A Common Stock ("Class A Common Stock") and
         5,000,000 shares of Class B Common Stock ("Class B Common Stock").

and further

         RESOLVED, that Section II of Article Fourth of the Certificate of
Incorporation of the Corporation be amended so as to be and read in its
entirety as follows:

         II.      Common Stock

                           The Common Stock of the Corporation shall consist of
         two classes: Class A Common Stock and Class B Common Stock. Each such
         class of Common Stock shall have the relative rights, powers,
         preferences, limitations and restrictions set forth in this Section
         II:

                  A.   Class A Common Stock and Class B Common Stock.

                           1. Dividends. Subject to the provisions of any
                  Preferred Stock Series Resolution, the Board of Directors
                  may, in its discretion, out of funds legally available for
                  the payment of dividends and at such times and in such manner
                  as determined by the Board of Directors, declare and pay
                  dividends on the Class A


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX D-1


<PAGE>   83
                  Common Stock and the Class B Common Stock, equally and
                  ratably as if such classes were but a single class.

                           2. Liquidation. In the event of any liquidation,
                  dissolution or winding up of the Corporation, whether
                  voluntary or involuntary, after payment or provision for
                  payment of the debts and other liabilities of the Corporation
                  and payment or setting aside for payment of any preferential
                  amount due to the holders of any other class or series of
                  stock, the holders of the Class A Common Stock and Class B
                  Common Stock shall be entitled to receive any or all assets
                  remaining to be paid or distributed, equally and ratably as
                  if such classes were but a single class; provided, however,
                  that, if any obligation of the Corporation to purchase shares
                  of Class B Common Stock pursuant to the exercise of a Put is
                  then pending, then upon any voluntary or involuntary
                  liquidation, dissolution, or winding-up of the Corporation,
                  the holders of Class B Common Stock at the time outstanding
                  will be entitled to receive out of the net assets of the
                  Corporation legally available for distribution to
                  shareholders after satisfaction of liabilities to creditors
                  as required by the Texas Business Corporation Act, subject to
                  the rights of the holders of any stock of the Corporation
                  ranking senior to the Class B Common Stock in respect of
                  distributions of assets upon liquidation, dissolution, or
                  winding-up of the Corporation but before any distribution of
                  assets is made with respect to any shares of Class A Common
                  Stock, an amount equal to the aggregate of the liquidation
                  preference specified in paragraph 6 of this subsection B.

                           3. Voting Rights. Except as may otherwise be
                  required by law, this Certificate of Incorporation or the
                  provisions of any Preferred Stock Series Resolution, the
                  holders of Class A Common Stock and Class B Common Stock,
                  voting together as a single class, shall have one vote for
                  each share of such stock held by such holder on each matter
                  voted upon by the stockholders.

                           4. Other Rights. Neither class of Common Stock shall
                  be subject to mandatory redemption or to redemption at the
                  option of the Corporation. Except as hereinafter provided,
                  neither class of Common Stock shall have any rights of
                  conversion or exchange. The registered owner of any shares of
                  Class B Common Stock may at any time and from time to time
                  convert any or all such shares into Class A Common Stock on
                  the basis of one share of Class A Common Stock for each share
                  of Class B Common Stock. Such conversion rate shall be
                  subject to equitable adjustment in the event the outstanding
                  shares of Class A Common Stock or Class B Common Stock are
                  changed into a different number of shares or a different
                  class by reason of any stock dividend, subdivision,
                  reclassification, recapitalization, split, combination or
                  exchange of shares. In addition, any shares of Class B Common
                  Stock outstanding on January 1, 2002 shall automatically and
                  without any action on the part of the holder thereof be
                  converted into shares of Class A Common Stock on the basis of
                  one share of Class A Common Stock for each share of Class B
                  Common Stock and thereupon the Common Stock of the
                  Corporation shall consist of a single class consisting of
                  50,000,000 authorized shares, designated as Common Stock;


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX D-2


<PAGE>   84
                  provided, however, that, if any Exercise Notice (as defined
                  below) shall have been given and be outstanding on January 1,
                  2002, such conversion shall be deferred until such time as
                  the Put transaction contemplated hereby to occur as the
                  result of the giving of such Exercise Notice has been
                  consummated.

                  B.       Additional Rights of Class B Common Stock.

                           1. Definitions. The following additional terms have
                  the respective meanings specified below:

                           "Bank Credit Agreement" shall mean that certain Loan
                           Agreement to be dated as of November 18, 1998 among,
                           inter alia, the Corporation, as U.S. Borrower, NATCO
                           Canada, Ltd., as Canadian Borrower, and Chase Bank
                           of Texas, National Association, as U.S. Agent for
                           the lenders thereunder, Bank of Nova Scotia, as
                           Canadian Agent for the lenders thereunder, and such
                           lenders, as amended from time to time.

                           "Business Day" means any day other than a day on
                           which banks in the State of Texas are authorized or
                           obligated to be closed.

                           "Corporate Statute" shall mean the General
                           Corporation Law of the State of Delaware.

                           "Effective Time" shall have the meaning ascribed to
                           such term in paragraph (1) of subsection D of this
                           Section II.

                           "Exercise Notice" shall have the meaning ascribed to
                           such term contained in paragraph 4 of this
                           subsection B.

                           "Holder" shall mean the registered owner of shares
                           of Class B Common Stock as indicated by the stock
                           transfer records for the Class B Common Stock of the
                           Corporation.

                           "Put" shall have the meaning ascribed to such term
                           contained in paragraph 2 of this subsection B.

                           "Put Period" shall have the meaning ascribed to such
                           term contained in paragraph 2 of this subsection B.

                           2. Put. Each Holder of Class B Common Stock shall
                  have the option (the "Put"), commencing on June 30, 2000 and
                  ending on December 31, 2001 (the "Put Period"), of causing
                  the Corporation to purchase from time to time any or all the
                  shares of Class B Common Stock then held by such Holder at a
                  cash purchase price per share of $13.00 per share.

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX D-3


<PAGE>   85
                           3. Applicable Covenant. The rights of each Holder of
                  Class B Common Stock under this Section II are subject to the
                  covenants of the Corporation contained in Section 8.5 of the
                  Bank Credit Agreement.

                           4. Method of Exercise. Any Holder of Class B Common
                  Stock may exercise a Put by giving, during the Put Period,
                  written notice (an "Exercise Notice") to the Corporation
                  specifying in such Exercise Notice the number of shares of
                  Class B Common Stock to be sold to the Corporation, the
                  certificate numbers of the stock certificates that evidence
                  such shares of Class B Common Stock and the aggregate
                  purchase price specified herein to be received by such Holder
                  of Class B Common Stock therefor.

                           5. Consummation. Subject to fulfillment or waiver of
                  the conditions thereto, the closing of such sale shall be
                  effected on the 20th Business Day following receipt of the
                  Exercise Notice by the Corporation. At the closing, the
                  Holder of Class B Common Stock shall deliver to the
                  Corporation one or more stock certificates registered in the
                  name of such Holder and evidencing the number of shares of
                  Class B Common Stock to be sold by the Holder thereof
                  pursuant to the Put, and the Corporation shall deliver to or
                  for the account of such Holder the aggregate purchase price
                  for such shares in immediately available funds.

                           6. Conditions. The obligation of the Corporation to
                  consummate a transaction pursuant to the exercise of a Put
                  shall be subject to the fulfillment or waiver of the
                  following conditions:

                             (a) Compliance with Corporate Statute. The
                           consummation of the purchase by the Corporation of
                           the shares of Class B Common Stock tendered for
                           purchase by a Holder thereof pursuant to the
                           exercise of a Put shall then comply with the
                           applicable provisions of the Corporate Statute and
                           the Bank Credit Agreement, as amended from time to
                           time.

                             (b) Reporting Company Status. Neither the
                           Corporation nor any issuer of any class or series of
                           security or securities into which the Class B Common
                           shall have been converted or for which the Class B
                           Common Stock shall have been exchanged, in either
                           case pursuant to any merger, consolidation, share
                           exchange, sale of all or substantially all of the
                           Corporation's assets or liquidation or dissolution
                           of the Corporation, shall then be or have previously
                           been subject to the reporting obligations imposed by
                           Section 15(d) or Section 13 of the Securities
                           Exchange Act of 1934, as amended.

                  If a transaction pursuant to the exercise of a Put is not
                  consummated as a result of the nonfulfillment of the
                  condition contained in subparagraph (a) of this paragraph 6,
                  then the obligation of the Corporation to purchase shares of
                  Class B Common Stock pursuant to such Put shall continue in
                  full force and effect, regardless of any expiration of the
                  time periods provided herein for the exercise of any such
                  Put, until


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX D-4


<PAGE>   86



                  the Corporation shall have complied with the terms of the Put
                  so exercised; provided, however, that the price per share of
                  Class B Common Stock of the Corporation payable pursuant to
                  paragraph 2 of this subsection B shall increase by a factor
                  equivalent to interest thereon at a rate per annum equal to
                  the prime rate of interest in effect from time to time at The
                  Chase Manhattan Bank for its most creditworthy corporate
                  customers from the date on which such price would otherwise
                  have been paid in accordance with the other provisions of
                  this subsection B until the date on which actually paid;
                  provided, however, that, commencing on the first anniversary
                  of the related Exercise Notice, such rate shall increase to
                  such prime rate plus 250 basis points. The aggregate amount
                  of the Corporation's obligation to purchase shares of Class B
                  Common Stock pursuant to such Put pending at any given time
                  shall constitute a liquidation preference of the Class B
                  Common Stock. At such time as the condition contained in
                  subparagraph (b) of this paragraph 6 shall occur (regardless
                  of whether a Put shall then have been exercised), the
                  obligation of the Corporation to purchase shares of Class B
                  Common Stock pursuant to any Put shall terminate.

                           7. Representations and Warranties. At the closing of
                  the sale of any shares of Class B Common Stock pursuant to
                  the exercise of a Put, the Holder of such shares of Class B
                  Common Stock shall represent and warrant in writing to the
                  Corporation that: (i) such Holder of Class B Common Stock has
                  full right, power and authority to sell and deliver such
                  shares of Class B Common Stock to the Corporation, (ii) such
                  Holder of Class B Common Stock owns such shares of Class B
                  Common Stock of record and beneficially, free and clear of
                  any liens, encumbrances and adverse claims and (iii), upon
                  delivery thereof to the Corporation pursuant to the exercise
                  of a Put by the Holder of Class B Common Stock, the
                  Corporation will acquire good title to such shares of Class B
                  Common Stock free and clear of any liens, encumbrances and
                  adverse claims (other than any that may have been created by
                  the Corporation).

                           8. Nonassignability. The rights of the Holder of
                  Class B Common Stock pursuant to this subsection B are
                  personal to the Holder of Class B Common Stock and may not be
                  assigned by any Holder of Class B Common Stock other than
                  proportionally in connection with an assignment of such
                  shares of Class B Common Stock by operation of law, by death
                  pursuant to a will or the laws of descent and distribution,
                  by transfer to a member of the immediate family of the Holder
                  of Class B Common Stock or a trust for the benefit of any
                  such family member, by transfer to a commercial bank or other
                  lending institution in accordance with the terms of a bona
                  fide pledge or, in the case of a Holder of Class B Common
                  Stock that is a legal entity at the Effective Time, by such
                  entity to an affiliate (no further assignment being
                  permitted) or successor of such entity or to the purchaser of
                  all or substantially all of that entity's assets, any or all
                  of which exceptions shall be permitted if the transferor or
                  transferee shall give notice of such assignment, together
                  with such information as may be reasonably necessary to
                  evidence qualification of the transferee to be an assignee
                  thereof, to the Corporation. Any assignment or transfer


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX D-5


<PAGE>   87
                  of shares of Class B Common Stock that is not in compliance
                  with the provisions of this paragraph 8 shall cause the
                  relinquishment and termination of the rights contained in
                  this subsection B as they would otherwise apply to such
                  shares of Class B Common Stock.

                  C.       Limited Rights to Class Vote.

                           1. So long as any shares of Class B Common Stock are
                  outstanding, the consent of the holders of not less than a
                  majority of the number of shares of Class B Common Stock then
                  outstanding, given in person or by proxy either at a regular
                  meeting or at a special meeting called for that purpose or
                  pursuant to written consents, at which or pursuant to which,
                  as the case may be, the holders of Class B Common Stock shall
                  vote separately as a class, shall be necessary (i) to approve
                  the issuance by the Corporation of any additional shares of
                  Class B Common Stock and (ii) for effecting, validating or
                  authorizing any amendment, alteration or repeal of any of the
                  provisions of this Section II of Article Fourth of this
                  Certificate of Incorporation, or any amendment thereto, or
                  any other certificate filed pursuant to law (excluding,
                  however, any such amendment, alteration or repeal effected by
                  any merger or consolidation to which the Corporation is a
                  party to the extent provided in paragraph 2 of this
                  subsection C) that would adversely affect any of the
                  designations, preferences, limitations or relative rights of
                  the shares of Class B Common Stock then outstanding;
                  provided, however, that any amendment or amendments to the
                  provisions of the Certificate of Incorporation, as amended,
                  so as to authorize or create, or to increase the authorized
                  amount of, any capital stock of the Corporation ranking pari
                  passu with or senior or junior to the Class B Common Stock as
                  to the payment of dividends or as to the distribution of
                  assets upon any liquidation, dissolution or winding-up of the
                  Corporation shall not be deemed to affect adversely the
                  designations, preferences, limitations or relative rights of
                  the Class B Common Stock.

                           2. The class vote accorded to the Class B Common
                  Stock by paragraph 1 of this subsection B shall not apply to
                  any amendment, alteration or repeal of any of the provisions
                  of this Section II effected by a merger to which the
                  Corporation is a party:

                                    (a) if the Class B Common Stock would in
                           such merger be converted into

                                    (i)  a right to receive cash;

                                    (ii) any equity security if that equity
                                    security is registered pursuant to Section
                                    12 of the Securities Exchange Act of 1934,
                                    as amended, or was issued by a corporation
                                    that is then subject to the reporting
                                    obligations imposed by Section 15(d) of the
                                    Securities Exchange Act of 1934, as
                                    amended, as a result of registration of an
                                    offering of that


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX D-6


<PAGE>   88
                                    equity security under the registration
                                    provisions of the Securities Act of 1933,
                                    as amended ("Equity Security");

                                    (iii) any security immediately convertible
                                    into or exchangeable for an Equity
                                    Security;

                                    (iv) any option or warrant immediately
                                    exercisable with respect to an Equity
                                    Security; or

                                    (v) any combination of any of the
                                    foregoing; or

                                    (b) if the Class B Common Stock would in
                           such merger be converted, in whole or in part, into
                           any security not contemplated by subparagraph (a) of
                           this paragraph 2 ("Other Security") if the relevant
                           documents provide that the Put shall continue after
                           the effective date of such merger as a right to
                           cause the Corporation or any successor thereto,
                           subject to the other provisions of this Section II,
                           to purchase, at the per share price specified in
                           paragraph 2 of subsection B less the amount of any
                           cash consideration per share of Class B Common Stock
                           paid in the merger, the number of shares or other
                           units of such Other Security into which each share
                           of Class B Common Stock was converted in the merger.

                           3. So long as any shares of the Class B Common Stock
                  remain outstanding, the holders of shares of the Class B
                  Common Stock, voting separately as a class, shall have the
                  right to nominate and to elect, by a majority vote of such
                  shares, one director to the Board of Directors of the
                  Corporation and to fill such position at any regular meeting
                  of stockholders or special meeting called for that purpose or
                  pursuant to written consents. Any director who shall have
                  been elected by holders of shares of Class B Common Stock may
                  be removed at any time, either for or without cause, by, and
                  only by, the affirmative vote of the holders of a majority of
                  the number of shares of Class B Common Stock then
                  outstanding, voting separately as a class, given at any
                  regular meeting of stockholders or a special meeting of such
                  stockholders called for that purpose or pursuant to written
                  consents, and any vacancy thereby created may be filled only
                  by the holders of shares of Class B Common Stock. Such
                  director shall be a member of the Class II Directors. Any
                  director so nominated and elected shall serve until the next
                  annual meeting of stockholders at which members of Class II
                  Directors are elected and until his successor shall have been
                  duly elected or until his earlier resignation, removal or
                  death. The first individual designated by the holders of the
                  Class B Common Stock to serve as a director of the
                  Corporation shall be George K. Hickox, Jr., the term of such
                  director to commence at the effective time of the first
                  issuance of any shares of Class B Common Stock.

                  D.       Exchange of Common Stock for Class A Common Stock.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX D-7


<PAGE>   89
                           1. Issued Shares. Upon the filing of a Certificate
                  of Amendment reflecting these amendments to the Certificate
                  of Incorporation of the Corporation with the Secretary of
                  State of the State of Delaware (the "Effective Time"), each
                  then issued share of common stock, par value $0.01 per share,
                  of the Corporation (the "Prior Common Stock"), including any
                  such shares held in the treasury of the Corporation, shall be
                  converted, without any action on the part of the holder
                  thereof, into one share of Class A Common Stock.

                           2. Reserved Shares. From and after the Effective
                  Time, each unissued share of the Prior Common Stock reserved
                  for issuance shall be converted, without any action on the
                  part of any Person, into one share of Class A Common Stock
                  and any obligation of the Corporation, whether contractual or
                  otherwise, to issue any shares of the Prior Common Stock
                  shall be deemed to be an obligation to issue an identical
                  number of shares of Class A Common Stock upon the same terms
                  and conditions.

                           3. Certificates. From and after the Effective Time,
                  each holder of a certificate theretofore evidencing shares of
                  the Prior Common Stock may be surrendered by the holder
                  thereof in exchange for a certificate or certificates
                  evidencing an equivalent number of shares of Class A Common
                  Stock.

         II. That in lieu of a special meeting and vote of the stockholders,
the stockholders of the Corporation, by written consent, approved, adopted and
consented to such amendments in accordance with the provisions of Section 228
of the General Corporation Law of the State of Delaware.

         III. That such amendments were duly adopted in accordance with the
provisions of Sections 242 and 228 of the General Corporation Law of the State
of Delaware.

         The undersigned, being the duly elected and currently acting Senior
Vice President and Chief Financial Officer of NATCO Group Inc., the Corporation
to which reference is made in this Certificate, does make this Certificate as
of the 18th day of November, 1998, and affirms and acknowledges, under
penalties of perjury, that this Certificate is the act and deed of the
Corporation and that the facts stated herein are true.

                                      ------------------------------------
                                          William B.  Wiener III
                                          Senior Vice President and Chief
                                                   Financial Officer
                                          NATCO Group Inc.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX D-8


<PAGE>   90


                                                                       ANNEX E-1


                                                                Cap I and Cap II

                          REGISTRATION RIGHTS AGREEMENT

     REGISTRATION RIGHTS AGREEMENT dated as of November 18, 1998 by and between
NATCO Group Inc., a Delaware corporation (the "Company"), and Capricorn
Investors, L.P., a Delaware limited partnership ("Cap I"), and Capricorn
Investors II, L.P., a Delaware limited partnership ("Cap II").

                                R E C I T A L S:

     On November 18, 1998, the Certificate of Incorporation of the Company was
amended to authorize two classes of common stock, par value $0.01 per share
("Common Stock"), to wit: 45,000,000 shares of Class A Common Stock ("Class A
Common Stock") and 5,000,000 shares of Class B Common Stock ("Class B Common
Stock"), and to convert each of the then outstanding shares of common stock of
the Company into one share of Class A Common Stock (the "Charter Amendments").

     After giving effect to the Charter Amendments, Cap I owns of record and
beneficially 5,563,667 shares (68.3%) of the outstanding Class A Common Stock.

     After giving effect to the Charter Amendments, Cap II owns of record and
beneficially 2,582,259 shares (31.7%) of the outstanding Class A Common Stock.

     Together, Cap I and Cap II own of record and beneficially, as of the date
of this Agreement, all the outstanding Class A Common Stock, being all the
outstanding Common Stock.

     The Company, National Tank Company, a Delaware corporation and a wholly
owned subsidiary of the Company ("Natco"), Natco Acquisition Company, a Delaware
corporation and a wholly owned subsidiary of the Company ("Newco") and The
Cynara Company, a Delaware corporation ("Cynara"), are parties to an Amended and
Restated Agreement and Plan of Merger dated November 17, 1998 but effective as
of March 26, 1998 (the "Merger Agreement"), pursuant to which Cynara will be
merged with and into Natco (the "Merger") and the Designated Stockholders will
receive shares of Class B Common Stock through conversion of the outstanding
shares of Cynara common stock.

     The Company and Cap II have executed and delivered an Investment Agreement
dated November 17, 1998 pursuant to which the Company has agreed to issue and
sell, and Cap II has agreed to purchase, a non-negotiable promissory note
convertible upon the occurrence of the events therein specified into 504,762
shares of Class A Common Stock.

     The stockholders of Cynara have entered into a Registration Rights
Agreement of even date herewith between the Company and such stockholders which
contains terms and provisions substantially similar to those herein (the "Cynara
Registration Rights Agreement").


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-1


<PAGE>   91


     NOW, THEREFORE, for and in consideration of the foregoing, the mutual
covenants and agreements contained herein and for other good and valuable
consideration, the receipt and adequacy of which are hereby acknowledged, the
parties hereto agree as follows:

     Section 1. Definitions and Usage.

             A. Definitions. The terms defined in this Section, wherever used in
this Agreement, shall, unless the context otherwise requires, have the
respective meanings hereinafter specified.

     "Affected Stockholders" shall mean each Stockholder all or a portion of
whose shares of Common Stock have been included in a Registration Statement
filed with the Commission pursuant to the provisions of this Agreement.

     "Agreement" shall mean this Registration Rights Agreement.

     "Cap I" shall have the meaning ascribed to such term in the first paragraph
of this Agreement.

     "Cap II" shall have the meaning ascribed to such term in the first
paragraph of this Agreement.

     "Class A Common Stock" shall have the meaning ascribed to such term in the
recitals to this Agreement.

     "Class B Common Stock" shall have the meaning ascribed to such term in the
recitals to this Agreement.

     "Commission" shall mean the United States Securities and Exchange
Commission.

     "Common Stock" shall have the meaning ascribed to such term in the recitals
to this Agreement.

     "Company" shall mean NATCO Group Inc., a Delaware corporation, and any
successor corporation by merger, consolidation or otherwise and any parent
corporation resulting from the merger or consolidation of the Company with or
into a subsidiary of another corporation.

     "Cynara" shall mean The Cynara Corporation, a Delaware corporation.

     "Cynara Registration Rights Agreement" shall have the meaning ascribed to
such term in the recitals to this Agreement.

     "Distribution Public Offering" shall mean a distribution (as such term is
used in the Securities Act and the Securities Act Rules) of Common Stock by Cap
I or Cap II to its general and

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-2

<PAGE>   92


limited partners pursuant to a Registration Statement filed and declared
effective under the Securities Act and the Securities Act Rules.

     "Effective Period" shall mean such period as shall be required under the
provisions of the Securities Act and the Securities Act Rules for delivery of a
prospectus meeting the requirements of Section 10(a) of the Securities Act to
any Person purchasing Common Stock in connection with an Underwritten Public
Offering, a Distribution Public Offering or a Market Public Offering, as the
case may be; provided, however, that such period shall not include any delivery
requirement with respect to the distribution by an underwriter of its unsold
allotment relating to an Underwritten Public Offering.

     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended,
as the same shall be in effect at the date of any determination to be made
hereunder.

     "Exchange Act Rules" shall mean the rules and regulations promulgated by
the Commission under the Exchange Act, as the same shall be in effect at the
date of any determination to be made hereunder.

     "Initial Public Offering" shall mean a public offering of Common Stock by
the Company as a result of which the Company first becomes subject to the
reporting requirements of Section 13 or 15(d) of the Exchange Act.

     "Market Public Offering" shall mean a public offering for cash of shares of
Common Stock into an existing trading market for outstanding shares of Common
Stock at other than a fixed price on or through the facilities of a national
securities exchange or to or through a market maker otherwise than on an
exchange, but in any case pursuant to a Registration Statement filed and
declared effective under the Securities Act and the Securities Act Rules.

     "Merger" shall have the meaning ascribed to such term in the recitals to
this Agreement.

     "Merger Agreement" shall have the meaning ascribed to such term in the
recitals to this Agreement.

     "Notice of Intent to File" shall mean a written notice given by the Company
pursuant to Section 2.D or Section 3.A that the Company is preparing to file a
Primary Distribution Registration Statement or a Secondary Distribution
Registration Statement under the Securities Act relating to an Underwritten
Public Offering of Common Stock.

     "Notice of Registration Request" shall mean a written notice given by the
Company pursuant to Section 2.A to the Stockholder that did not send the
applicable Registration Request or pursuant to Section 2.B to all Stockholders
(other than the Stockholder who sent the applicable Registration Request), in
each case notifying such Stockholders that the applicable Registration Request
has been received by the Company and briefly advising such Stockholders that
they have the right to request

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-3

<PAGE>   93


Registration for the distribution of their holdings of Common Stock, subject to
the terms and provisions of this Agreement.

     "Person" shall mean an individual, a corporation, a partnership, a trust,
an unincorporated organization or a government or any agency or political
subdivision thereof.

     "Primary Distribution" shall mean an Underwritten Public Offering of Common
Stock offered, sold and delivered by the Company.

     "Primary Distribution Registration Statement" shall mean a Registration
Statement filed by the Company and declared effective under the Securities Act
and the Securities Act Rules relating to a Primary Distribution.

     "Public Offering" shall mean either a Distribution Public Offering, a
Market Public Offering or an Underwritten Public Offering

     "Registrable Shares" shall mean shares of Common Stock owned of record by
any Stockholder as to which such Stockholder has requested Registration pursuant
to the provisions of Section 2.A, 2.B, 3.B or 4.A.

     "Registration" shall mean the registration under the registration
provisions of the Securities Act of the offering, sale and delivery of shares of
Common Stock.

     "Registration Expenses" shall mean the expenses associated with the
preparation and filing of any registration statement pursuant to Section 2.C,
3.C or 4.A herein and any sale covered thereby (including the reasonable fees
and expenses of legal counsel to the Affected Stockholders, fees related to blue
sky qualifications and filing fees in respect of the National Association of
Securities Dealers, Inc.), but excluding underwriting discounts or commissions
in respect of shares of Common Stock to be sold by the Affected Stockholders.

     "Registration Request" shall mean a written notice from a Stockholder
requesting that the Company file a Registration Statement with respect to a
Distribution Public Offering pursuant to Section 2.A herein, an Underwritten
Public Offering pursuant to Section 2.B herein or a Public Offering pursuant to
Section 4.A herein, in which the Stockholder advises the Company as to the
number of shares of Common Stock that the Stockholder wishes to include in the
applicable Registration and in which the Stockholder agrees to (i) the specified
method of distribution, (ii), in the case of an Underwritten Public Offering,
the designated managing underwriter and (iii) agrees to provide to the Company
all such information as may be required by the Company pursuant to Section 6
herein.

     "Registration Period" shall mean the period of time from the decision of
the Company to prepare and file a Registration Statement to and including the
effective date of such Registration Statement.

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-4

<PAGE>   94


     "Registration Statement" shall mean a registration statement filed on Form
S-1, S-2 or S-3 (or any successor form) under the registration provisions of the
Securities Act and the Securities Act Rules.

     "Request Period" shall mean a period of ten business days after receipt
pursuant to Section 2.A by the Stockholder that did not send the applicable
Registration Request or after receipt pursuant to Section 2.B by all
Stockholders (other than the Stockholder who sent the applicable Registration
Request) of the Notice of Registration Request.

     "Secondary Distribution" shall mean an Underwritten Public Offering of
Common Stock offered, sold and delivered by shareholders of the Company other
than the Stockholders, but including the holders of Common Stock acquired
pursuant to the Merger and subject to the Cynara Registration Rights Agreement.

     "Secondary Distribution Registration Statement" shall mean a Registration
Statement filed by the Company and declared effective under the Securities Act
and the Securities Act Rules relating to a Secondary Distribution, including a
distribution requested by the shareholders subject to the Cynara Registration
Rights Agreement.

     "Securities Act" shall mean the Securities Act of 1933, as amended, as the
same shall be in effect at the date of any determination to be made hereunder.

     "Securities Act Rules" shall mean the rules and regulations promulgated by
the Commission pursuant to the Securities Act, as the same shall be in effect at
the date of any determination to be made hereunder.

     "Stockholders" shall mean Cap I and Cap II and, upon registration of record
ownership of shares of Common Stock by them, Nathaniel A. Gregory, Winokur and
the general and limited partners of Cap I and Cap II and any assignee of any of
them; provided, however, that, in the case of any such record owner, the
offering, sale and delivery of shares of such Common Stock are not exempt from
the registration provisions of the Securities Act pursuant to Section 4(1)
thereof (without regard to the exemption provided by Rule 144 under the
Securities Act unless paragraph (k) of Rule 144 is applicable thereto); and
provided, further, that, in the case of any assignee other than Nathaniel A.
Gregory, Winokur and such general and limited partners, such assignee has agreed
to be bound by the provisions of this Agreement in accordance with Section 15
herein.

     "Supplemental Registration Request" shall mean a written notice given by
any Stockholder pursuant to the provisions of Section 2.A, 2.B or 3.B herein, in
which the Stockholder advises the Company as to the number of shares of Common
Stock that the Stockholder wishes to include in the applicable Registration and
in which the Stockholder agrees to (i) the specified method of distribution,
(ii), in the case of an Underwritten Public Offering, the designated managing
underwriter and (iii) agrees to provide to the Company all such information as
may be required by the Company pursuant to Section 7 herein.

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-5

<PAGE>   95


     "Underwritten Public Offering" shall mean a firm commitment underwritten
public offering for cash of shares of Common Stock pursuant to a Registration
Statement filed and declared effective under the Securities Act and the
Securities Act Rules.

     "Winokur" shall mean Herbert S. Winokur, Jr. or any legal entity (other
than Cap I or Cap II) of which Mr. Winokur is the predominant beneficial owner.

             B. Rules of Construction. Unless the context otherwise requires, as
used in this Agreement: (a) a term has the meaning ascribed to it; (b) "or" is
not exclusive; (c) "including" means "including without limitation;" (d) words
in the singular include the plural; (e) words in the plural include the
singular; (f) words applicable to one gender shall be construed to apply to each
gender; (g) the terms "hereof," "herein," "hereby," "hereto" and derivative or
similar words refer to this entire Agreement; and (h) the term "Section" shall
refer to the specified Section of this Agreement.

     Section 2. Registration Rights.

     A. Distribution Registration Request. If the Company shall receive a
Registration Request from Cap I or Cap II requesting that the Company file a
Registration Statement relating to a Distribution Public Offering of shares of
Common Stock owned by such Stockholder, the Company shall, if the other
Stockholder (Cap I or Cap II) has not theretofore distributed its holdings of
Common Stock to its partners in complete or partial liquidation, give promptly
(and in any event within ten business days) a Notice of Registration Request to
the Stockholder that did not send the Registration Request of the receipt of the
Registration Request, enclosing a copy of the Registration Request. During the
Request Period, the other Stockholder shall be entitled to give a Supplemental
Registration Request to the Company in which such Stockholder requests that the
Company register pursuant to the Securities Act and the Securities Act Rules the
shares of Common Stock owned by such Stockholder to be distributed in a
Distribution Public Offering.

     B. Registration Request. If the Company shall receive a Registration
Request from a Stockholder requesting that the Company file a Registration
Statement relating to an Underwritten Public Offering of shares of Common Stock
owned by such Stockholder, the Company shall give promptly (and in any event
within ten business days) a Notice of Registration Request to each other
Stockholder of the receipt of the Registration Request, enclosing a copy of the
Registration Request. During the Request Period, the other Stockholders shall be
entitled to give a Supplemental Registration Request to the Company in which any
or all such Stockholders request that the Company register pursuant to the
Securities Act and the Securities Act Rules all or any portion of the shares of
Common Stock owned by such Stockholders to be distributed in an Underwritten
Public Offering.

     C. Required Registration. At the end of the Request Period in the case of a
Registration Request made pursuant to Section 2.A or 2.B herein, the Company
shall, subject to the provisions of Section 2.D herein, prepare as promptly as
practicable and file a Registration Statement with

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-6

<PAGE>   96


respect to the distribution in accordance with the applicable method of
distribution of the Registrable Shares to be included therein and use its best
efforts to cause the Registration Statement to become effective under the
Securities Act in accordance with the Securities Act Rules,.

     D. Suspension of Obligations. The Company's obligations under Section 2.C
and Section 4.A herein to prepare and file a Registration Statement and to seek
its effectiveness shall be subject to the following provisions:

        i.  The Company shall be required to file no more than an aggregate of
     five (5) Registration Statements pursuant to Section 2.A and Section 2.B
     and one (1) Registration Statement pursuant to Section 4.A herein.

        ii. The Company's obligations to prepare, file and seek effectiveness of
     a requested Registration Statement shall be suspended:

            (a) in the case of an Underwritten Public Offering, if the aggregate
        number of Registrable Shares to be included in such requested
        Registration Statement is less than 750,000 shares of the then issued
        and outstanding Common Stock;

            (b) in any case, during the period from the time that it gives a
        Notice of Intent to File to Stockholders that it is preparing to file a
        Primary Distribution Registration Statement until 90 days (or such
        shorter period as to which the managing underwriter of the Primary
        Distribution to which the Primary Distribution Registration Statement
        relates shall consent in writing) have lapsed following the effective
        date of a Primary Distribution Registration Statement under the
        Securities Act; provided, however, that (A) such Notice of Intent to
        File is given prior to the time of receipt by the Company of a
        Registration Request by any Stockholder and (B) that the Company shall
        use its best efforts to cause such Primary Distribution Registration
        Statement to be declared effective as promptly as practicable; and
        provided further that the obligation to file a Registration Statement on
        behalf of any Stockholder shall be reinstated if the Company does not
        file a Primary Distribution Registration Statement within 30 days after
        giving the Notice of Intent to File;

            (c) in any case, during the period from the time that it gives a
        Notice of Intent to File to Stockholders that it is preparing to file a
        Secondary Distribution Registration Statement until 90 days (or such
        shorter period as to which the managing underwriter of a Secondary
        Distribution effected by means of a Secondary Distribution Registration
        Statement shall consent in writing) have lapsed following the effective
        date of the Secondary Distribution Registration Statement under the
        Securities Act; provided, however, that (A) such Notice of Intent to
        File is given prior to time of receipt by the Company of a Registration
        Request by any Stockholder and (B) that the Company shall use its best
        efforts to cause such Secondary Distribution Registration Statement to
        be declared effective as promptly as practicable; and

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-7


<PAGE>   97


        provided further that the obligation to file a Registration Statement on
        behalf of any Stockholder shall be reinstated if the Company does not
        file a Secondary Distribution Registration Statement within 30 days
        after giving the Notice of Intent to File; or

            (d) in any case, if at the time of receipt by the Company of a
        Registration Request the Company has material inside information as to
        which it believes it has a valid business purpose in refraining from
        disclosing publicly for the time being and that current public
        disclosure of such information would have a material adverse effect on
        the Company, for a period commencing with the date of receipt of the
        Registration Request and ending on the earlier of (a) 60 days after such
        receipt of the Registration Request; (b) the public announcement of such
        material inside information; or (c) the date on which the Company gives
        the Stockholder who issued the Registration Request a notice that
        suspension of its obligation is no longer required; provided, however,
        that the same material inside information shall not constitute a basis
        for continuation of this suspension period.

        iii. A Registration Statement filed pursuant to a Registration Request
     made under Section 2.B herein shall first include all Registrable Shares
     requested to be included by any and all Stockholders and, only after such
     inclusion, may include Common Stock being sold for the account of the
     Company or any other security holders. Any Common Stock to be offered on
     behalf of the Company or such other security holders will be included in
     such Registration Statement only to the extent that, in the reasonable
     opinion of the managing underwriter for the Underwritten Public Offering of
     Registrable Shares on behalf of Stockholders, such inclusion will not
     materially adversely affect the distribution of Registrable Shares on
     behalf of such Stockholders.

     E. Underwriter. The selection of an underwriter for an Underwritten Public
Offering of Registrable Shares by Stockholders shall be subject to the approval
of the Company, which shall not be unreasonably withheld.

     F. Withdrawn Registration Statement. For purposes of Section 2.D(i) herein,
if a requested Registration Statement is filed and the Company otherwise
complies with its obligations hereunder, and

        i. the Registration Statement is withdrawn with the consent of the
     Affected Stockholders as a result of a delay in the offering requested by
     the Company, then no requested Registration Statement shall be deemed to
     have been filed; or

        ii. the Affected Stockholders cease to prosecute the Public Offering
     subject thereto actively and in good faith, the Company shall have the
     right to withdraw the Registration Statement without the consent of the
     Affected Stockholders and the requested Registration Statement shall be
     deemed to have been filed.

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-8

<PAGE>   98


     Section 3. Incidental/"Piggy-back" Registration.

     A. Notice of Intent to File. If the Company at any time proposes to file a
Primary Distribution Registration Statement or a Secondary Distribution
Registration Statement under the Securities Act relating to an Underwritten
Public Offering of Common Stock that would permit the inclusion therein of
shares of Common Stock to be distributed in accordance with the method of
distribution contemplated by such Registration Statement, the Company shall give
to each Stockholder a Notice of Intent to File promptly after a determination
has been made by the Company to prepare and file such Registration Statement,
but in any event not less than ten days before the filing with the Commission of
such Registration Statement, which notice shall set forth the intended method of
distribution (including the name of the managing underwriter) of the securities
proposed to be registered. The Notice of Intent to File shall include an offer
to include in such filing, subject to the other provisions of this Agreement,
such amount of Registrable Shares as each Stockholder may request.

     B. Supplemental Registration Request. If any Stockholder wishes to have
Registrable Shares registered pursuant to this Section 3, it shall advise the
Company by giving a Supplemental Registration Request within 20 days after the
date of receipt of the Notice of Intent to File (or such shorter period, but in
any event not less than ten days, as the Company shall specify in its Notice of
Intent to File), setting forth the amount of Registrable Shares for which
Registration is requested.

     C. Registration Obligation. Subject to the provisions of the next sentence,
the Company shall include all Registrable Shares specified in the Supplemental
Registration Requests received by it in accordance with subsection B of this
Section 3. If, however, the managing underwriter of the proposed Primary
Distribution or Secondary Distribution shall advise the Company in writing that,
in the reasonable opinion of such managing underwriter, the inclusion in the
Registration Statement of the aggregate number of shares of Common Stock
requested by the Stockholders to be included in the Primary Distribution or
Secondary Distribution would materially adversely affect such distribution of
securities, then the Company shall so advise the Affected Stockholders and the
number of such shares of Common Stock included in the Registration Statement
shall be reduced to the number acceptable to such managing underwriter and such
reduced number of shares shall be allocated pro rata among the Affected
Stockholders based on the Registrable Shares held by each. If any Stockholder
does not agree to the terms of underwriting of such Primary Distribution or
Secondary Distribution, the shares of Common Stock owned by such Stockholder
shall be excluded therefrom by written notice from the Company or such managing
underwriter.

     D. Underwriting Agreement. Any obligation of the Company to include shares
of Common Stock of any Stockholder in a Registration Statement prepared and
filed pursuant to this Section 3 shall be conditioned upon the agreement of such
Stockholder to enter into an underwriting agreement with the Company, other
security holders, if any, and the managing underwriter of the Primary
Distribution or the Secondary Distribution of the type described in subsection
(H) of Section 5.

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-1-9

<PAGE>   99


     Section 4. Special Registration Right.

     A. Preparation and Filing. If at any time during the term hereof, (i)
Winokur acquires the record and beneficial ownership of any Common Stock from
Cap I or Cap II, (ii) in the opinion of counsel, reasonably satisfactory to the
Company, all or part of such shares may not be sold by Winokur without
registration under the Securities Act or reliance on an exemption from the
registration provisions thereof (other than Section 4(1) of the Securities Act)
and (iii) Winokur desires in good faith to pledge all or a portion of such
shares as collateral for borrowings by Winoker from one or more lenders
("Lenders"), then, upon receipt by the Company of a Registration Request from
Winokur or the Lenders, the Company shall, subject to the provisions of Section
2.D herein, prepare as promptly as practicable and file a Registration Statement
with respect to the offering, sale and delivery by the Lenders of all or any
part of the shares of Common Stock pledged by Winokur to the Lenders in
accordance with the applicable method of distribution of the Registrable Shares
to be included therein and use its best efforts to cause the Registration
Statement to become effective under the Securities Act in accordance with the
Securities Act Rules. If so requested by Winokur or the Lenders, the
Registration Statement shall be filed pursuant to Rule 415 (relating to "shelf
registration statements") of the Securities Act Rules.

     B. Distribution. The applicable method of distribution of the Registrable
Shares shall be as requested by the Lenders (or Winokur on behalf of the
Lenders) and the methods of distribution may include a distribution by one or
more broker-dealers named in the Registration Statement "at the market" pursuant
to a Market Public Offering. The Company agrees that it will amend the
Registration Statement or supplement the prospectus to include any material
information with respect to the plan of distribution not previously disclosed in
the Registration Statement or any material change to such information in the
Registration Statement.

     C. Limitations. The preparation and filing of a Registration Statement
pursuant to this Section 4 and the offering, sale and delivery of Registrable
Shares pursuant thereto shall be subject to the following limitations:

        i. The Company shall be obligated to prepare, file and cause to become
     effective only one Registration Statement pursuant to this Section 4.

        ii. The only offering, sale and delivery of Registrable Shares under
     such Registration Statement shall be for the account of the Lenders after a
     foreclosure of the lien against such shares following a default in payment
     of the borrowings made against such collateral, and no sales of such shares
     shall be effected by the Lenders under such Registration Statement prior to
     the delivery to the Company of a certificate of the Lenders to such effect.

        iii. The proposed and actual filing by the Company of a Registration
     Statement pursuant to this Section 4 shall not entitle any Stockholder to
     registration rights pursuant to Section 3 herein.

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-10

<PAGE>   100


        iv. The offering, sale and delivery of Registrable Shares pursuant to
     any Registration Statement filed pursuant to Rule 415 (relating to "shelf
     registration statements") of the Securities Act Rules under this Section 4
     shall be suspended if, at the time of any offering, sale and delivery
     pursuant to a shelf registration statement, the Company has material inside
     information as to which it believes it has a valid business purpose in
     refraining from disclosing publicly for the time being and that current
     public disclosure of such information would have a material adverse effect
     on the Company. Such suspension period shall commence upon notice by the
     Company to Winokur and the Lenders and shall continue until the earlier of
     (a) the expiration of 60 days thereafter; (b) the public announcement of
     such material inside information; or (c) the date on which the Company
     gives Winokur and the Lenders notice that such suspension is no longer
     required; provided, however, that the same material inside information
     shall not constitute a basis for continuation of this suspension period.

        v. The Company shall be obligated to maintain the effectiveness of a
     Registration Statement filed pursuant to Rule 415 (relating to "shelf
     registration statements") of the Securities Act Rules under this Section 4
     until the third anniversary of the effective date thereof and no longer.

     D. Benefits. Upon receipt by the Company of a Registration Request under
this Section 4, the Lenders shall have the benefits and obligations of an
Affected Stockholder under Sections 5, 6, 7 and 8 of this Agreement and of a
Stockholder under Sections 9, 10, 11, 12, 13, 16 and 17 of this Agreement.

     Section 5. Registration Procedures. If the Company is required by the
provisions of Section 2, 3 or 4 to effect the Registration of any of the
Registrable Shares, the Company shall, as expeditiously as possible:

     A. Filing. Prepare and file with the Commission a Registration Statement
with respect to such shares of Common Stock and use its best efforts to cause
such Registration Statement to become and, subject to subsection C of this
Section 5, remain effective.

     B. Amendments. Prepare and file with the Commission during the Registration
Period such amendments and supplements to such Registration Statement and the
prospectus used in connection therewith as may be necessary to permit such
Registration Statement to become effective in accordance with the Securities Act
and the Securities Act Rules and to ensure that such Registration Statement and
the prospectus used in connection therewith comply with the disclosure standards
of Section 11 of the Securities Act and Section 10(b) of the Exchange Act and
that such prospectus complies with Section 10 of the Securities Act, in each
case during the Effective Period.

     C. Maintenance of Effectiveness. Subject to the provisions of Section 4.C
herein, use its best efforts to maintain the effectiveness of such Registration
Statement and to ensure compliance of the prospectus contained therein with
Section 10(a) of the Securities Act for the Effective Period.

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-11

<PAGE>   101


     D. Copies. Furnish to each Affected Stockholder (i) such number of copies
of such Registration Statement and of each amendment and supplement thereto (in
each case including all exhibits), such number of copies of the prospectus
included in such Registration Statement (including each preliminary prospectus,
summary prospectus and prospectus supplement), in conformity with the
requirements of the Securities Act, and such other documents, as such Affected
Stockholder may reasonably require in order to facilitate the offering, sale and
delivery or other disposition of the Registrable Shares owned by such Affected
Stockholder and (ii), during the Registration Period and the Effective Period,
copies of any written correspondence or memoranda relating to oral
communications in each case with the Commission and copies of any request by the
Commission for any amendment of or supplement to the Registration Statement or
the prospectus included therein or for additional information.

     E. Blue Sky Laws. Use its best efforts to register or qualify the Common
Stock covered by such Registration Statement under the securities or blue sky
laws of such jurisdictions as the managing underwriter of such Distribution may
reasonably request (excluding, however, any jurisdiction in which the filing
would subject the Company to additional tax liability and any jurisdiction in
which the Company would thereby be required to execute a general consent to
service of process) and use all reasonable efforts to do such other acts and
things as may be required to enable the Affected Stockholders to consummate the
public sale or other disposition in such jurisdictions of the Registrable Shares
owned by such Affected Stockholders.

     F. Earnings Statement. Make available to its holders of Common Stock, as
soon as reasonably practicable, an earnings statement covering the period of at
least 12 months, but not more than 18 months, beginning with the first month
after the effective date of the Registration Statement, which earnings statement
shall satisfy the provisions of Section 11(a) of the Securities Act.

     G. Amended Prospectuses. Notify each Affected Stockholder immediately if
the Company shall become aware at any time during the Effective Period that the
prospectus included in the Registration Statement, as such prospectus may be
amended or supplemented, includes an untrue statement of a material fact or
omits to state any material fact required to be stated therein or necessary in
order to make the statements therein not misleading in light of the
circumstances then existing, and at the request of any Affected Stockholder to
prepare promptly and to furnish to each Affected Stockholder such number of
copies of an amended or supplemental prospectus as may be necessary so that, as
thereafter delivered to the purchasers of such Registrable Shares, such
prospectus shall not include an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary in order to
make the statements therein not misleading in the light of the circumstances
then existing.

     H. Underwriting Agreements. Enter into such agreements (including an
underwriting agreement in customary form and containing customary provisions
relating to legal opinions and accountants' letters, representations and
warranties and mutual indemnification and contribution between the Company and
the underwriters for the Affected Stockholders) and use all reasonable

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-12

<PAGE>   102


efforts to take such other actions as the Affected Stockholders may reasonably
request in order to expedite or facilitate the disposition of such Registrable
Shares.

     I. Inspection. Make available for inspection by the Affected Stockholders,
by any underwriter participating in any distribution to be effected pursuant to
such Registration Statement and by any attorney, accountant or other agent
retained by Affected Stockholders or any such underwriter all pertinent
financial and other records, pertinent corporate documents and properties of the
Company and cause all of the Company's officers, directors and employees to
supply all such information requested by the Affected Stockholders, such
underwriter, attorney, accountant or agent, as is reasonably needed in
connection with such Registration.

     6. Classes of Stock. The parties hereto intend that any capital stock sold
by a Stockholder pursuant to the provisions of this Agreement shall be Class A
Common Stock if sold prior to January 1, 2002 or Common Stock if sold
thereafter. Accordingly, any reference herein to the inclusion of Common Stock
in a Registration Statement for offering, sale and delivery by a Stockholder
hereunder shall, subject to the proviso to Article Fourth, II-A-4, of the
Certificate of Incorporation of the Company, prior to January 1, 2002 be deemed
to refer to Class A Common Stock and thereafter to Common Stock.

     7. Expenses; Limitations on Registration. The Registration Expenses
relating to any Registration effected by the Company pursuant to this Agreement
shall be for the account of the Company; provided, however, that any and all
underwriting discounts and commissions attributable to the sale of the shares of
Common Stock of the Affected Stockholders shall be for the account of the
Affected Stockholders.

     For purposes of this Section 7, the Company shall be obligated to pay the
fees and expenses of only one law firm representing the Affected Stockholders.
If more than one such firm shall represent the Affected Stockholders in
connection with a Registration under this Agreement, the Affected Stockholders
shall notify the Company as to which firm shall be deemed to represent the
Affected Stockholders for purposes of this Section 7.

     Section 8. Stockholders' Information. The Affected Stockholders shall
provide all information reasonably requested by the Company for inclusion in any
Registration Statement to be filed hereunder. The actual provision of such
information shall be a condition precedent to the obligation of the Company to
take any action pursuant to this Agreement in respect of the Registration of
Registrable Shares of any Affected Stockholder.

     Section 9. Indemnification.

     A. In connection with the Registration of any Registrable Shares under the
Securities Act pursuant to this Agreement, the Company agrees to indemnify and
hold harmless each Affected Stockholder, its partners, directors, officers and
employees, and each other Person, if any, who controls such Affected Stockholder
within the meaning of Section 15 of the Securities Act, against

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-13

<PAGE>   103


any losses, claims, damages or liabilities, joint or several, to which such
Affected Stockholder or any such partner, director, officer, employee or
controlling Person may become subject under the Securities Act or any other
statute or at common law, insofar as such losses, claims, damages or liabilities
(or actions in respect thereof) arise out of or are based upon (i) any untrue
statement or any alleged untrue statement of a material fact contained in the
Registration Statement or the prospectus included therein at the time the
Registration Statement is declared effective or any omission or alleged omission
of a material fact required to be stated therein or necessary in order to make
the statements therein not misleading or (ii) any untrue statement of a material
fact or alleged untrue statement of a material fact contained in the
Registration Statement, any preliminary prospectus, the prospectus included
therein or any amendment or supplement thereto or any omission or alleged
omission of a material fact required to be stated therein or necessary in order
to make the statements concerning the Company therein, in the light of the
circumstances under which they were made, not misleading and shall reimburse
each Affected Stockholder and each such partner, director, officer, employee and
controlling Person for any legal or other expenses reasonably incurred by such
Affected Stockholder or such partner, director, officer employee or controlling
Person in connection with investigating or defending any such loss, claim,
damage, liability or action; provided, however, that the Company shall not be
liable in any such case to the extent that any such loss, claim, damage or
liability arises out of or is based upon any untrue statement or alleged untrue
statement or omission or alleged omission made in such Registration Statement,
preliminary prospectus, prospectus, or amendment or supplement in reliance upon
and in conformity with written information furnished by or on behalf of an
Affected Stockholder to the Company expressly for use therein; and provided,
further, that the Company shall not be liable in any such case to the extent
that any such loss, claim, damage, liability or expense arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission in any preliminary prospectus if such untrue statement or
alleged untrue statement or omission or alleged omission was corrected in the
final prospectus included in the Registration Statement at the time it became
effective and the Affected Stockholder, in the case of a Distribution Public
Offering or a Market Public Offering, or the managing underwriter, in the case
of an Underwritten Public Offering, failed to provide the final prospectus as
required by the Securities Act and the Securities Act Rules. Such indemnity
shall remain in full force and effect regardless of any investigation made by or
on behalf of any Affected Stockholder or any such partner, director, officer,
employee or controlling Person, and shall survive the transfer of such
securities by any Affected Stockholder.

     B. Each Affected Stockholder agrees to indemnify and hold harmless the
Company, its directors, officers and employees, each other Person, if any, who
controls the Company and each other Affected Stockholder against any losses,
claims, damages or liabilities, joint or several, to which the Company, any such
director, officer or employee, any such controlling Person or such other
Affected Stockholder may become subject under the Securities Act or any other
statute or at common law, insofar as such losses, claims, damages or liabilities
(or actions in respect thereof) arise out of or are based upon (i) any untrue
statement or any alleged untrue statement of a material fact contained in the
Registration Statement or the prospectus included therein at the time the
Registration Statement is declared effective or any omission or alleged omission
of a material fact required to be stated therein or necessary in order to make
the statements therein not misleading or

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-14

<PAGE>   104


(ii) any untrue statement of a material fact or alleged untrue statement of a
material fact contained in the Registration Statement, any preliminary
prospectus, the prospectus included therein or any amendment or supplement
thereto or any omission or alleged omission of a material fact required to be
stated therein or necessary in order to make the statements concerning the
Company therein, in the light of the circumstances under which they were made,
not misleading, in each case to the extent, but only to the extent, that such
alleged untrue statement or alleged omission was made in such Registration
Statement, preliminary prospectus, prospectus, amendment or supplement in
reliance upon and in conformity with written information furnished by or on
behalf of an Affected Stockholder to the Company expressly for use therein, and
shall reimburse the Company or such director, officer, employee or other Person
for any legal or any other expenses reasonably incurred in connection with
investigating or defending any such loss, claim, damage, liability or action.

     C. Promptly after receipt by an indemnified party hereunder of written
notice of the commencement of any action or proceeding involving a claim
referred to in subsection (A) or (B) of this Section 9, such indemnified party
will, if a claim in respect thereof is to be made against an indemnifying party,
give written notice to the latter of the commencement of such action; provided,
that the failure of any indemnified party to give notice as provided herein
shall not relieve the indemnifying party of its obligation under this subsection
C to the extent the indemnifying party is not materially prejudiced by such
failure. In case any such action is brought against an indemnified party, the
indemnified party shall permit the indemnifying party to assume the defense of
such action or proceeding, provided that counsel for the indemnifying party, who
shall conduct the defense of such action or proceeding, shall be approved by the
indemnified party (whose approval shall not be unreasonably withheld) and the
indemnified party may participate in such defense (in which case, such
participation shall be at such indemnified party's expense, unless in such
indemnified party's reasonable judgment a conflict of interest between such
indemnified party and the indemnifying party shall exist in respect of such
claim, in which event the indemnifying party shall pay the reasonable fees and
expense of separate counsel for the indemnified party). No indemnifying party
shall consent to entry of any judgment or enter into any settlement that does
not include as an unconditional term thereof the giving by the claimant or
plaintiff to such indemnified party of a release from all liability in respect
to such claim or litigation. The indemnifying party shall not, in connection
with any proceeding or related proceedings in the same jurisdiction, be liable
for the fees and expenses of more than one separate firm for all indemnified
parties. The indemnifying party shall not be liable for any settlement of any
proceeding effected without its written consent.

     D. Indemnification similar to that specified in the preceding subsections
of this Section 9 shall be given by the Company and each Affected Stockholder
(with such modifications as shall be appropriate) with respect to liability
related to any required registration or other qualification of Registrable
Shares under any Federal or state law or regulation of governmental authority
other than the Securities Act.

     E. If the indemnification provided for in this Section 9 is unavailable or
insufficient to hold harmless an indemnified party under subsection (A) or (B)
above, then the indemnifying party shall contribute to the amount paid or
payable by such indemnified party as a result of the losses, claims,

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-15

<PAGE>   105


damages or liabilities referred to in subsection (A) or (B) above, in such
proportion as is appropriate to reflect the relative fault of the Company, on
the one hand, and each Affected Stockholder, on the other, in connection with
the statements or omissions that resulted in such losses, claims, damages or
liabilities, as well as any other relevant equitable considerations. The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by the
Company or such Affected Stockholder and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
untrue statement or omission. The Company and the Affected Stockholders agree
that it would not be just and equitable if contributions pursuant to this
subsection (E) were to be determined by pro rata allocation or by any other
method of allocation that does not take account of the equitable considerations
referred to in the first sentence of this subsection (E). The amount paid by an
indemnified party as a result of the losses, claims, damages or liabilities
referred to in the first sentence of this subsection (E) shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified
party in connection with investigating or defending any action or claim (which
shall be limited as provided in subsection (C) above if the indemnifying party
has assumed the defense of any such action in accordance with the provisions
thereof) that is the subject of this subsection (E). Notwithstanding the
provisions of this subsection (E), in respect of any loss, claim, damage or
liability based upon any untrue or alleged untrue statement of a material fact
or omission or alleged omission to state a material fact that relates to
information other than information supplied by any Affected Stockholder, no
Affected Stockholder shall be required to contribute any amount in excess of the
amount by which the total price at which the Registrable Shares offered by it
and distributed to the public exceeds the amount of any damages that such
Affected Stockholder has otherwise been required to pay by reason of such untrue
or alleged untrue statement or omission or alleged omission. No Person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the Act)
shall be entitled to contribution from any Person who was not guilty of such
fraudulent misrepresentation. Promptly after receipt by an indemnified party
under this subsection (E) of notice of the commencement of any action against
such party in respect of which a claim for contribution may be made against an
indemnifying party under this subsection (E), such indemnified party shall
notify the indemnifying party in writing of the commencement thereof if the
notice specified in subsection (C) above has not been given with respect to such
action; but the omission so to notify the indemnifying party shall not relieve
it from any liability which it may have to any indemnified party under this
subsection (E) to the extent such omission is not prejudicial.

     Section 10. Public Availability of Information. The Company shall comply
with all applicable public information reporting requirements of the Commission,
to the extent required from time to time to enable each Stockholder to sell
Registrable Shares without Registration under the Securities Act within the
limitation of the exemptions provided by (i) Rule 144 under the Securities Act,
as such Rule may be amended from time to time, or (ii) any similar rule or
regulation hereafter adopted by the Commission. Upon the request of any
Stockholder, the Company will deliver to such Stockholder a written statement as
to whether it has complied with such requirements.

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-16

<PAGE>   106


     Section 11. Supplying Information. The Company shall cooperate with each
Stockholder in supplying such information as may be necessary for such
Stockholder to complete and file any information reporting forms presently or
hereafter required by the Commission as a condition to the availability of an
exemption from the Securities Act for the sale of any Registrable Shares.

     Section 12. Specific Performance. Each party hereto acknowledges and agrees
that each other party hereto would be irreparably harmed and would have no
adequate remedy of law if any of the provisions of this Agreement were not
performed in accordance with their specific terms or were otherwise breached.
Accordingly, it is agreed that, in addition to any other remedies by law or in
equity which may be available, the parties hereto shall be entitled to obtain
preliminary and permanent injunctive relief with respect to any breach or
threatened breach of, or otherwise obtain specific performance of, the covenants
and other agreements contained in this Agreement.

     Section 13. Representations and Warranties of the Company. The Company
represents and warrants to each Stockholder that, as of the date of this
Agreement, (a) the Company is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware and has the corporate
power and authority to enter into this Agreement and to carry out its
obligations hereunder, (b) the execution and delivery of this Agreement by the
Company and the consummation by the Company of the transactions contemplated
hereby have been duly authorized by all necessary corporate action on the part
of the Company and no other corporate proceedings on the part of the Company are
necessary to authorize this Agreement or any of the transactions contemplated
hereby and (c) this Agreement has been duly executed and delivered by the
Company and constitutes a valid and binding obligation of the Company, and,
assuming that this Agreement constitutes a valid and binding obligation of each
of Cap I and Cap II, is enforceable against the Company in accordance with its
terms, subject to applicable bankruptcy, reorganization, insolvency, moratorium,
fraudulent conveyance and similar laws affecting creditors' rights generally
from time to time and to general principles of equity and except as the
enforceability thereof may be limited by considerations of public policy.

     Section 14. Representations and Warranties of Cap I and Cap II. Each of Cap
I and Cap II represents and warrants to the Company that, as of the date of this
Agreement, (a) it is a limited partnership duly organized, validly existing and
in good standing under the laws of the State of Delaware and has the
organizational power and authority to enter into this Agreement and to carry out
its obligations hereunder, (b) the execution and delivery of this Agreement by
such Stockholder and the consummation by such Stockholder of the transactions
contemplated hereby have been duly authorized by all necessary organizational
action on the part of such Stockholder and no other organizational proceedings
on the part of such Stockholder are necessary to authorize this Agreement or any
of the transactions contemplated hereby and (c) this Agreement has been duly
executed and delivered by such Stockholder and constitutes a valid and binding
obligation of such Stockholder and, assuming that this Agreement constitutes a
valid and binding obligation of the Company, is enforceable against such
Stockholder in accordance with its terms, subject to applicable bankruptcy,
reorganization, insolvency, moratorium, fraudulent conveyance and similar laws
affecting creditors'

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-17

<PAGE>   107


rights generally from time to time and to general principles of equity and
except as the enforceability thereof may be limited by considerations of public
policy.

     Section 15. Expiration. This Agreement and the rights, benefits, duties and
obligations hereunder of the parties hereto and their successors and permitted
assigns shall expire and be of no further force or effect on the 180th day after
the later to occur of (i) May 31, 2004 and (ii) the first date on which each and
all of Cap I, Cap II, Nathaniel A. Gregory and, to the extent that Winokur has
acquired the record and beneficial ownership of shares of Common Stock from Cap
I or Cap II, Winokur is able to sell shares of Common Stock subject hereto in
reliance upon the exemption from the registration provisions of the Securities
Act contained in Rule 144(k) or any successor Securities Act Rule.

     Section 16. Notices. All notices and other communications hereunder shall
be in writing and shall be deemed given if delivered personally or transmitted
by telex, telegram or facsimile transmission or mailed by registered or
certified mail (return receipt requested) to the parties at the following
addresses (or at such other address for a party as shall be specified by like
notice):

     (a)      if to Cap I, to:
              Capricorn Investors, L.P.
              c/o Winokur Holdings, Inc.
              30 East Elm Street
              Greenwich, Connecticut  06830
              Attention:  Herbert S.  Winokur, Jr.
                          President
              Telecopy No.:  (203) 861-6671

              with a copy to:
              O'Melveny & Myers LLP
              153 E. 53rd Street
              53rd Floor
              New York, New York 10022-4611
              Attn.:  Mr. Jeffrey J.  Rosen
              Facsimile: (212) 326-2061

     (b)      if to Cap II, to:
              Capricorn Investors II, L.P.
              c/o Capricorn Holdings, LLC
              30 East Elm Street
              Greenwich, Connecticut  06830
              Attention:  Manager
              Telecopy No.:  (203) 861-6671

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-18

<PAGE>   108


              with a copy to:
              O'Melveny & Myers LLP
              153 E. 53rd Street
              53rd Floor
              New York, New York 10022-4611
              Attn.:  Mr. Jeffrey J.  Rosen
              Facsimile:  (212) 326-2061

     (c)      if to the Company, to:
              NATCO Group, Inc.
              Brookhollow Central III
              2950 North Loop West
              Suite 750
              Houston, Texas 77092
              Attn.:  Mr. Nathaniel A. Gregory, Chairman and Chief
                      Executive Officer
              Facsimile No.:  (713) 683-7814

              with a copy to:
              Vinson & Elkins L.L.P.
              First City Tower
              1001 Fannin Street
              Houston, Texas 77002-6760
              Attn.:  Mr. William E. Joor III
              Facsimile No.:  (713) 615-5201

     Section 17. Benefit and Assignment.

             (a) The terms and conditions of this Agreement shall inure to the
     benefit of and be binding on the parties hereto and their respective
     successors and permitted assigns; provided, however, that, except as
     otherwise provided in this Section, this Agreement shall not be assignable
     by any party hereto except by operation of law or with the prior express
     written consent of the other parties hereto. Upon registration of record
     ownership of shares of Common Stock by Nathaniel A. Gregory, Winokur or any
     general or limited partner of Cap I or Cap II, such person shall become a
     Stockholder and a third party beneficiary of all the rights of a
     Stockholder hereunder. Nothing in this Agreement, express or implied, is
     intended to confer upon any party, other than the parties hereto, their
     respective successors and permitted assigns and such third party
     beneficiaries, any rights, remedies, obligations or liabilities under or by
     reason of this Agreement.

             (b) If Cap I or Cap II shall transfer and assign shares of Common
     Stock to any Person otherwise than in a Distribution Public Offering or an
     Underwritten Public Offering, Cap I or Cap II (or any Person who shall be a
     transferee or assignee pursuant to this subsection (b)), as the case may
     be, may assign such portion of its rights and benefits under

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-19

<PAGE>   109


     this Agreement as is necessary to permit such Person to act as a
     Stockholder hereunder; provided, however, that such Person shall agree in
     writing to be bound by the duties and obligations of a Stockholder
     hereunder.

     Section 18. Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard to
the application of doctrines of conflicts of law.

     Section 19. Counterparts. This Agreement may be executed simultaneously in
one or more counterparts, any of which may have been transmitted and received by
facsimile transmission and each of which shall be deemed to be an original but
all of which together shall constitute one and the same instrument.

             (The remainder of this page left blank intentionally.)

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-20

<PAGE>   110


     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed by their officers thereunto duly authorized.

                                       NATCO GROUP INC.



                                       BY:
                                           -------------------------------------
                                           Nathaniel A. Gregory
                                           Chairman and Chief Executive Officer

                                       CAPRICORN INVESTORS, L.P.

                                       By: Capricorn Holdings, G.P.,
                                           its general partner

                                       By: Winokur Holdings, Inc.,
                                           its general partner

                                       By:
                                           -------------------------------------
                                           Herbert S. Winokur, Jr.
                                           President.

                                       CAPRICORN INVESTORS II, L.P.

                                       By: Capricorn Holdings, LLC,
                                           its general partner

                                       By:
                                           -------------------------------------
                                           Herbert S. Winokur, Jr.
                                           Manager








                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-1-21

<PAGE>   111


                                                                       ANNEX E-2

                                                                         Cynara

                         REGISTRATION RIGHTS AGREEMENT

         REGISTRATION RIGHTS AGREEMENT dated as of November 18, 1998 by and
between NATCO Group Inc., a Delaware corporation (the "Company"), and the
undersigned holders of Common Stock of the Company (the "Designated
Stockholders").

                                R E C I T A L S:

         On November 18, 1998, the Certificate of Incorporation of the Company
was amended to authorize two classes of common stock, par value $0.01 per share
("Common Stock"), to wit: 45,000,000 shares of Class A Common Stock ("Class A
Common Stock") and 5,000,000 shares of Class B Common Stock ("Class B Common
Stock"), and to convert each of the then outstanding shares of common stock of
the Company into one share of Class A Common Stock (the "Charter Amendments").

         After giving effect to the Charter Amendments, Cap I owns of record
and beneficially 5,563,667 shares (68.3%) of the outstanding Class A Common
Stock.

         After giving effect to the Charter Amendments, Cap II owns of record
and beneficially 2,582,259 shares (31.7%) of the outstanding Class A Common
Stock.

         Together, Cap I and Cap II own of record and beneficially, as of the
date of this Agreement, all the outstanding Class A Common Stock, being all the
outstanding Common Stock.

         The Company, National Tank Company, a Delaware corporation and a
wholly owned subsidiary of the Company ("Natco"), Natco Acquisition Company, a
Delaware corporation and a wholly owned subsidiary of the Company ("Newco") and
The Cynara Company, a Delaware corporation ("Cynara"), are parties to an
Amended and Restated Agreement and Plan of Merger dated November 17 1998 but
effective as of March 26, 1998 (the "Merger Agreement"), pursuant to which
Cynara will be merged with and into Natco (the "Merger") and the Designated
Stockholders will receive shares of Class B Common Stock through conversion of
the outstanding shares of Cynara common stock.

         The Company and Cap II have executed and delivered an Investment
Agreement dated November 17, 1998 pursuant to which the Company has agreed to
issue and sell, and Cap II has agreed to purchase, a non-negotiable promissory
note convertible upon occurrence of the events therein specified into 504,762
shares of Class A Common Stock.

         Cap I and Cap II have entered into a Registration Rights Agreement of
even date herewith between the Company and such stockholders which contains
terms and provisions substantially similar to those herein (the "Capricorn
Registration Rights Agreement").

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-1


<PAGE>   112



         It is a condition to consummation of the Merger that the stockholders
of Cynara who will become stockholders of the Company upon consummation of the
Merger shall have entered into a registration rights agreement as contemplated
by the Merger Agreement.

         NOW, THEREFORE, for and in consideration of the foregoing, the mutual
covenants and agreements contained herein and for other good and valuable
consideration, the receipt and adequacy of which are hereby acknowledged, the
parties hereto agree as follows:

         Section 1.        Definitions and Usage.

                  A. Definitions. The terms defined in this Section, wherever
used in this Agreement, shall, unless the context otherwise requires, have the
respective meanings hereinafter specified.

         "Affected Stockholders" shall mean each Stockholder all or a portion
of whose shares of Common Stock have been included in a Registration Statement
filed with the Commission pursuant to the provisions of this Agreement.

         "Agreement" shall mean this Registration Rights Agreement.

         "Cap I" shall mean Capricorn Partners, L.P., a Delaware limited
partnership.

         "Cap II" shall mean Capricorn Partners II, L.P., a Delaware limited
partnership.

         "Capricorn Registration Rights Agreement" shall have the meaning
ascribed to such term in the recitals to this Agreement.

         "Class A Common Stock" shall have the meaning ascribed to such term in
the recitals to this Agreement.

         "Class B Common Stock" shall have the meaning ascribed to such term in
the recitals to this Agreement.

         "Commission" shall mean the United States Securities and Exchange
Commission.

         "Common Stock" shall have the meaning ascribed to such term in the
recitals to this Agreement.

         "Company" shall mean NATCO Group Inc., a Delaware corporation, and any
successor corporation by merger, consolidation or otherwise and any parent
corporation resulting from the merger or consolidation of the Company with or
into a subsidiary of another corporation.

         "Cynara" shall mean The Cynara Corporation, a Delaware corporation.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-2

<PAGE>   113



         "Designated Stockholders" shall have the meaning ascribed to such term
in the first paragraph of this Agreement.

         "Earnout Shares" shall mean the CTOC Earnout Shares, the Initial
Earnout Shares and the Supplemental Earnout Shares as those terms are defined
in the Merger Agreement.

         "Effective Period" shall mean such period as shall be required under
the provisions of the Securities Act and the Securities Act Rules for delivery
of a prospectus meeting the requirements of Section 10(a) of the Securities Act
to any Person purchasing Common Stock in connection with an Underwritten Public
Offering or a Market Public Offering; provided, however, that such period shall
not include any delivery requirement with respect to the distribution by an
underwriter of its unsold allotment relating to an Underwritten Public
Offering.

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, as the same shall be in effect at the date of any determination to be
made hereunder.

         "Exchange Act Rules" shall mean the rules and regulations promulgated
by the Commission under the Exchange Act, as the same shall be in effect at the
date of any determination to be made hereunder.

         "Market Public Offering" shall mean a public offering for cash of
shares of Common Stock into an existing trading market for outstanding shares
of Common Stock at other than a fixed price on or through the facilities of a
national securities exchange or to or through a market maker otherwise than on
an exchange, but in any case pursuant to a Registration Statement filed and
declared effective under the Securities Act and the Securities Act Rules.

         "Merger" shall have the meaning ascribed to such term in the recitals
to this Agreement.

         "Merger Agreement" shall have the meaning ascribed to such term in the
recitals to this Agreement.

         "Notice of Intent to File" shall mean a written notice given by the
Company pursuant to Section 2.C or Section 3.A that the Company is preparing to
file a Primary Distribution Registration Statement or a Secondary Distribution
Registration Statement under the Securities Act relating to an Underwritten
Public Offering of Common Stock.

         "Notice of Registration Request" shall mean a written notice given by
the Company pursuant to Section 2.A or 4.A to each Stockholder that did not
send the applicable Registration Request, notifying such Stockholders that the
applicable Registration Request has been received by the Company and briefly
advising such Stockholders that they have the right to request Registration for
the distribution of their holdings of Common Stock, subject to the terms and
provisions of this Agreement.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-3

<PAGE>   114



         "Person" shall mean an individual, a corporation, a partnership, a
trust, an unincorporated organization or a government or any agency or
political subdivision thereof.

         "Primary Distribution" shall mean an Underwritten Public Offering of
Common Stock offered, sold and delivered by the Company.

         "Primary Distribution Registration Statement" shall mean a
Registration Statement filed by the Company and declared effective under the
Securities Act and the Securities Act Rules relating to a Primary Distribution.

         "Public Offering" shall mean either an Underwritten Public Offering or
a Market Public Offering.

         "Registrable Shares" shall mean shares of Common Stock owned of record
by any Stockholder as to which such Stockholder has requested Registration
pursuant to the provisions of Section 2.A, 3.B or 4.A.

         "Registration" shall mean the registration under the registration
provisions of the Securities Act of the offering, sale and delivery of shares
of Common Stock.

         "Registration Expenses" shall mean the expenses associated with the
preparation and filing of any registration statement pursuant to Section 2.B,
3.C or 4.B herein and any sale covered thereby (including the reasonable fees
and expenses of legal counsel to the Affected Stockholders, fees related to
blue sky qualifications and filing fees in respect of the National Association
of Securities Dealers, Inc.), but excluding underwriting discounts or
commissions in respect of shares of Common Stock to be sold by the Affected
Stockholders.

         "Registration Request" shall mean a written notice from a Stockholder
requesting that the Company file a Registration Statement with respect to an
Underwritten Public Offering pursuant to Section 2.A herein or with respect to
a Public Offering pursuant to Section 4.A herein.

         "Registration Period" shall mean the period of time from the decision
of the Company to prepare and file a Registration Statement to and including
the effective date of such Registration Statement.

         "Registration Statement" shall mean a registration statement filed on
Form S-1, S-2 or S-3 (or any successor form) under the registration provisions
of the Securities Act and the Securities Act Rules.

         "Request Period" shall mean a period of fifteen (15) business days
after receipt of a Notice of Registration Request from the Company pursuant to
Section 2.A or 4.A by each Stockholder that did not send the applicable
Registration Request.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-4

<PAGE>   115



         "Secondary Distribution" shall mean an Underwritten Public Offering of
Common Stock offered, sold and delivered by shareholders of the Company other
than the Stockholders, but including the holders of Common Stock subject to the
Capricorn Registration Rights Agreement.

         "Secondary Distribution Registration Statement" shall mean a
Registration Statement filed by the Company and declared effective under the
Securities Act and the Securities Act Rules relating to a Secondary
Distribution, including a distribution requested by the shareholders subject to
the Capricorn Registration Rights Agreement.

         "Securities Act" shall mean the Securities Act of 1933, as amended, as
the same shall be in effect at the date of any determination to be made
hereunder.

         "Securities Act Rules" shall mean the rules and regulations
promulgated by the Commission pursuant to the Securities Act, as the same shall
be in effect at the date of any determination to be made hereunder.

         "Stockholders" shall mean any or all of the Designated Stockholders
and any assignee of shares of Common Stock theretofore held by any of them;
provided, however, that, in the case of any such assignee, the offering, sale
and delivery of shares of such Common Stock by such assignee are not exempt
from the registration provisions of the Securities Act pursuant to Section 4(1)
thereof (without regard to the exemption provided by Rule 144 under the
Securities Act unless paragraph (k) of Rule 144 is applicable thereto); and
provided, further, that, in the case of any assignee, such assignee has agreed
to be bound by the provisions of this Agreement in accordance with Section 15
herein.

         "Supplemental Registration Request" shall mean a written notice given
by any Stockholder pursuant to the provisions of Section 2.A, 3.B or 4.A
herein, in which the Stockholder advises the Company as to the number of shares
of Common Stock that the Stockholder wishes to include in the applicable
Registration and in which the Stockholder agrees to (i) the specified method of
distribution, (ii) if applicable, the designated managing underwriter and (iii)
provide to the Company all such information as may be required by the Company
pursuant to Section 7 herein.

         "Underwritten Public Offering" shall mean a firm commitment
underwritten public offering for cash of shares of Common Stock pursuant to a
Registration Statement filed and declared effective under the Securities Act
and the Securities Act Rules.

                  B. Rules of Construction. Unless the context otherwise
requires, as used in this Agreement: (a) a term has the meaning ascribed to it;
(b)"including" means "including without limitation;" (c) words in the singular
include the plural; (d) words in the plural include the singular; (e) words
applicable to one gender shall be construed to apply to each gender; (f) the
terms "hereof," "herein," "hereby," "hereto" and derivative or similar words
refer to this entire Agreement; and (g) the term "Section" shall refer to the
specified Section of this Agreement.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-5

<PAGE>   116



         Section 2.        Registration Rights.

         A. Registration Request. If the Company shall receive a Registration
Request from a Stockholder requesting that the Company file a Registration
Statement relating to an Underwritten Public Offering of shares of Common Stock
owned by such Stockholder, the Company shall give promptly (and in any event
within ten business days) a Notice of Registration Request to each other
Stockholder of the receipt of the Registration Request, enclosing a copy of the
Registration Request. During the Request Period, the other Stockholders shall
be entitled to give a Supplemental Registration Request to the Company in which
any or all such Stockholders request that the Company register pursuant to the
Securities Act and the Securities Act Rules all or any portion of the shares of
Common Stock owned by such Stockholders to be distributed in an Underwritten
Public Offering.

         B. Required Registration. At the end of the Request Period, the
Company shall, subject to the provisions of Section 2.C herein, prepare as
promptly as practicable and file a Registration Statement with respect to the
distribution in accordance with the applicable method of distribution of the
Registrable Shares to be included therein and use its best efforts to cause the
Registration Statement to become effective under the Securities Act in
accordance with the Securities Act Rules,.

         C. Suspension of Obligations. The Company's obligations under Section
2.B herein to prepare and file a Registration Statement and to seek its
effectiveness shall be subject to the following provisions:

                  i. The Company shall be required to file no more than two (2)
         Registration Statements pursuant to Section 2.A herein and one (1)
         Registration Statement pursuant to Section 4.B herein.

                  ii. The Company's obligations to prepare, file and seek
         effectiveness of a requested Registration Statement shall be
         suspended:

                           (a) if the aggregate number of Registrable Shares to
                  be included in such requested Registration Statement is less
                  than 500,000 shares of the then issued and outstanding Common
                  Stock;

                           (b) in any case, during the period from the time
                  that it gives a Notice of Intent to File to Stockholders that
                  it is preparing to file a Primary Distribution Registration
                  Statement until 90 days (or such shorter period as to which
                  the managing underwriter of the Primary Distribution to which
                  the Primary Distribution Registration Statement relates shall
                  consent in writing) have lapsed following the effective date
                  of a Primary Distribution Registration Statement under the
                  Securities Act; provided, however, that (A) such Notice of
                  Intent to File is given prior to the time of receipt by the
                  Company of a Registration Request by any Stockholder and (B)
                  that the Company shall use its best efforts to cause such
                  Primary Distribution

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-6

<PAGE>   117



                  Registration Statement to be declared effective as promptly
                  as practicable; and provided, further, that the obligation to
                  file a Registration Statement on behalf of any Stockholder
                  shall be reinstated if the Company does not file a Primary
                  Distribution Registration Statement within 30 days after
                  giving the Notice of Intent to File;

                           (c) in any case, during the period from the time
                  that it gives a Notice of Intent to File to Stockholders that
                  it is preparing to file a Secondary Distribution Registration
                  Statement until 90 days (or such shorter period as to which
                  the managing underwriter of a Secondary Distribution effected
                  by means of a Secondary Distribution Registration Statement
                  shall consent in writing) have lapsed following the effective
                  date of the Secondary Distribution Registration Statement
                  under the Securities Act; provided, however, that (A) such
                  Notice of Intent to File is given prior to time of receipt by
                  the Company of a Registration Request by any Stockholder and
                  (B) that the Company shall use its best efforts to cause such
                  Secondary Distribution Registration Statement to be declared
                  effective as promptly as practicable; and provided, further,
                  that the obligation to file a Registration Statement on
                  behalf of any Stockholder shall be reinstated if the Company
                  does not file a Secondary Distribution Registration Statement
                  within 30 days after giving the Notice of Intent to File;

                           (d) if at the time of receipt by the Company of a
                  Registration Request the Company has material inside
                  information as to which it believes it has a valid business
                  purpose in refraining from disclosing publicly for the time
                  being and that current public disclosure of such information
                  would have a material adverse effect on the Company, for a
                  period commencing with the date of receipt of the
                  Registration Request and ending on the earlier of (a) 60 days
                  after such receipt of the Registration Request; (b) the
                  public announcement of such material inside information; or
                  (c) the date on which the Company gives the Stockholder who
                  issued the Registration Request a notice that suspension of
                  its obligation is no longer required; provided, however, that
                  the same material inside information shall not constitute a
                  basis for continuation of this suspension period; or

                           (e) if at the time of receipt by the Company of a
                  Registration Request the Company is not required to file
                  reports with the Commission pursuant to Section 15(d) of the
                  Securities Act or Section 13 of the Exchange Act.

                  iii. A Registration Statement filed pursuant to a
         Registration Request made under Section 2.B herein shall first include
         all Registrable Shares requested to be included by any and all
         Stockholders and, only after such inclusion, may include Common Stock
         being sold for the account of the Company or any other security
         holders. Any Common Stock to be offered on behalf of the Company or
         such other security holders will be included in such Registration
         Statement only to the extent that, in the reasonable opinion of the
         managing underwriter for the Underwritten Public Offering of
         Registrable Shares on behalf of

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-7

<PAGE>   118



         Stockholders, such inclusion will not materially adversely affect the
         distribution of Registrable Shares on behalf of such Stockholders.

         D. Underwriter. The selection of an underwriter for an Underwritten
Public Offering of Registrable Shares by Stockholders shall be subject to the
approval of the Company, which shall not be unreasonably withheld.

         E. Withdrawn Registration Statement. For purposes of Section 2.C(i)
herein, if a requested Registration Statement is filed and the Company
otherwise complies with its obligations hereunder, and

                  i. the Registration Statement is withdrawn with the consent
         of the Affected Stockholders as a result of a delay in the offering
         requested by the Company, then no requested Registration Statement
         shall be deemed to have been filed; or

                  ii. the Affected Stockholders cease to prosecute the Public
         Offering subject thereto actively and in good faith, the Company shall
         have the right to withdraw the Registration Statement without the
         consent of the Affected Stockholders and the requested Registration
         Statement shall be deemed to have been filed.

         Section 3.        Incidental/"Piggy-back" Registration.

         A. Notice of Intent to File. If the Company at any time proposes to
file a Primary Distribution Registration Statement or a Secondary Distribution
Registration Statement under the Securities Act relating to an Underwritten
Public Offering of Common Stock that would permit the inclusion therein of
shares of Common Stock to be distributed in accordance with the method of
distribution contemplated by such Registration Statement, the Company shall
give to each Stockholder a Notice of Intent to File promptly after a
determination has been made by the Company to prepare and file such
Registration Statement, but in any event not less than ten days before the
filing with the Commission of such Registration Statement, which notice shall
set forth the intended method of distribution (including the name of the
managing underwriter) of the securities proposed to be registered. The Notice
of Intent to File shall include an offer to include in such filing, subject to
the other provisions of this Agreement, such amount of Registrable Shares as
each Stockholder may request.

         B. Supplemental Registration Request. If any Stockholder wishes to
have Registrable Shares (including Earnout Shares) registered pursuant to this
Section 3, it shall advise the Company by giving a Supplemental Registration
Request within 20 days after the date of receipt of the Notice of Intent to
File (or such shorter period, but in any event not less than ten days, as the
Company shall specify in its Notice of Intent to File), setting forth the
amount of Registrable Shares for which Registration is requested.


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-8

<PAGE>   119



         C. Registration Obligation. Subject to the provisions of the next
sentence, the Company shall include all Registrable Shares specified in the
Supplemental Registration Requests received by it in accordance with Subsection
B of this Section 3. If, however, the managing underwriter of the proposed
Primary Distribution or Secondary Distribution shall advise the Company in
writing that, in the reasonable opinion of such managing underwriter, the
inclusion in the Registration Statement of the aggregate number of shares of
Common Stock requested by the Stockholders to be included in the Primary
Distribution or Secondary Distribution would materially adversely affect such
distribution of securities, then the Company shall so advise the Affected
Stockholders and the number of such shares of Common Stock included in the
Registration Statement shall be reduced to the number acceptable to such
managing underwriter and such reduced number of shares shall be allocated pro
rata among the Affected Stockholders based on the Registrable Shares held by
each. If any Stockholder does not agree to the terms of underwriting of such
Primary Distribution or Secondary Distribution, the shares of Common Stock
owned by such Stockholder shall be excluded therefrom by written notice from
the Company or such managing underwriter.

         D. Underwriting Agreement. Any obligation of the Company to include
shares of Common Stock of any Stockholder in a Registration Statement prepared
and filed pursuant to this Section 3 shall be conditioned upon the agreement of
such Stockholder to enter into an underwriting agreement with the Company,
other security holders, if any, and the managing underwriter of the Primary
Distribution or the Secondary Distribution of the type described in subsection
(H) of Section 5.

         Section 4.      Special Registration Right. Pursuant to the terms of
the Merger Agreement, the Designated Stockholders may in the future receive
Earnout Shares and, in order to provide liquidity to the Designated
Stockholders who receive such Earnout Shares, the Company has agreed to provide
a special right of Registration with respect to such Earnout Shares as in this
Section 4 provided.

         A. Notices. If, at any time during the term hereof, (i) some or all of
the Stockholders receive the record and beneficial ownership of Earnout Shares,
whether from the Company upon original issue pursuant to the Merger Agreement
or from one or more Designated Stockholders upon assignment not involving a
Public Offering, (ii), in the opinion of counsel reasonably satisfactory to the
Company, all or part of such Earnout Shares may not be sold by such
Stockholders without registration under the Securities Act or reliance on an
exemption from the registration provisions thereof (other than Section 4(1) of
the Securities Act) and (iii) the Company shall receive a Registration Request
from one or more such Stockholders requesting that the Company file a
Registration Statement relating to a Public Offering of shares of Common Stock
owned by such Stockholder or Stockholders, then the Company shall give promptly
(and in any event within ten business days) a Notice of Registration Request to
each other Stockholder who, to the knowledge of the Company, holds Earnout
Shares of the receipt of the Registration Request, enclosing a copy of the
Registration Request. During the Request Period, such other Stockholders shall
be entitled to give a Supplemental Registration Request to the Company in which
any or all such Stockholders request that the Company register pursuant to the
Securities Act and the Securities Act Rules all or

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX E-2-9

<PAGE>   120



any portion of the shares of Common Stock constituting Earnout Shares owned by
such Stockholders.

         B. Preparation and Filing. After the Request Period, the Company
shall, subject to the provisions of Section 2.C herein, prepare as promptly as
practicable and file a Registration Statement with respect to the offering,
sale and delivery by the Stockholders of all or any part of the shares of
Common Stock constituting Earnout Shares in accordance with the applicable
method of distribution of the Registrable Shares to be included therein
specified in the Registration Request and use its best efforts to cause the
Registration Statement to become effective under the Securities Act in
accordance with the Securities Act Rules. If so requested by such Affected
Stockholders, the Registration Statement shall be filed pursuant to Rule 415
(relating to "shelf registration statements") of the Securities Act Rules.

         C. Distribution. The applicable method of distribution of the
Registrable Shares shall be as requested by the Affected Stockholders and the
methods of distribution may include a distribution by one or more
broker-dealers named in the Registration Statement "at the market" pursuant to
a Market Public Offering. The Company agrees that it will amend the
Registration Statement or supplement the prospectus to include any material
information with respect to the plan of distribution not previously disclosed
in the Registration Statement or any material change to such information in the
Registration Statement.

         D. Limitations. The preparation and filing of a Registration Statement
pursuant to this Section 4 and the offering, sale and delivery of Registrable
Shares pursuant thereto shall be subject to the following limitations:

                  i. The Company shall be obligated to prepare, file and cause
         to become effective only one Registration Statement pursuant to this
         Section 4.

                  ii. Only Earnout Shares, whether received by a Designated
         Stockholder from the Company upon original issue pursuant to the
         Merger Agreement or received by another Stockholder from a Designated
         Stockholder upon an assignment not involving a Public Offering, may be
         included in a Registration Statement filed pursuant to this Section 4,
         and no sales of such shares shall be effected by the Affected
         Stockholders under such Registration Statement prior to the delivery
         to the Company of a certificate of the Affected Stockholders to such
         effect.

                  iii. The proposed and actual filing by the Company of a
         Registration Statement pursuant to this Section 4 shall not entitle
         any Stockholder to registration rights pursuant to Section 3 herein.

                  iv. The offering, sale and delivery of Registrable Shares
         pursuant to any Registration Statement filed pursuant to Rule 415
         (relating to "shelf registration statements") of the Securities Act
         Rules under this Section 4 shall be suspended if, at the time of any
         offering,

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-10

<PAGE>   121



         sale and delivery pursuant to a shelf registration statement, the
         Company has material inside information as to which it believes it has
         a valid business purpose in refraining from disclosing publicly for
         the time being and that current public disclosure of such information
         would have a material adverse effect on the Company. Such suspension
         period shall commence upon notice by the Company to the Affected
         Stockholders and shall continue until the earlier of (a) the
         expiration of 60 days thereafter; (b) the public announcement of such
         material inside information; or (c) the date on which the Company
         gives the Affected Stockholders notice that such suspension is no
         longer required; provided, however, that the same material inside
         information shall not constitute a basis for continuation of this
         suspension period.

                  v. The Company shall be obligated to maintain the
         effectiveness of a Registration Statement filed pursuant to Rule 415
         (relating to "shelf registration statements") of the Securities Act
         Rules under this Section 4 until the third anniversary of the
         effective date thereof and no longer.

         Section 5.      Registration Procedures. If the Company is required by
the provisions of Section 2, 3 or 4 to effect the Registration of any of the
Registrable Shares, the Company shall, as expeditiously as possible:

         A. Filing. Prepare and file with the Commission a Registration
Statement with respect to such shares of Common Stock and use its best efforts
to cause such Registration Statement to become and, subject to Subsection C of
this Section 5, remain effective.

         B. Amendments. Prepare and file with the Commission during the
Registration Period such amendments and supplements to such Registration
Statement and the prospectus used in connection therewith as may be necessary
to permit such Registration Statement to become effective in accordance with
the Securities Act and the Securities Act Rules and to ensure that such
Registration Statement and the prospectus used in connection therewith comply
with the disclosure standards of Section 11 of the Securities Act and Section
10(b) of the Exchange Act and that such prospectus complies with Section 10 of
the Securities Act, in each case during the Effective Period.

         C. Maintenance of Effectiveness. Subject to the provisions of Section
4.D herein, use its best efforts to maintain the effectiveness of such
Registration Statement and to ensure compliance of the prospectus contained
therein with Section 10(a) of the Securities Act for the Effective Period.

         D. Copies. Furnish to each Affected Stockholder (i) such number of
copies of such Registration Statement and of each amendment and supplement
thereto (in each case including all exhibits), such number of copies of the
prospectus included in such Registration Statement (including each preliminary
prospectus, summary prospectus and prospectus supplement), in conformity with
the requirements of the Securities Act, and such other documents as such
Affected Stockholder may reasonably require in order to facilitate the
offering, sale and delivery or other disposition of the Registrable Shares
owned by such Affected Stockholder and (ii), during the

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-11

<PAGE>   122



Registration Period and the Effective Period, copies of any written
correspondence or memoranda relating to oral communications in each case with
the Commission and copies of any request by the Commission for any amendment of
or supplement to the Registration Statement or the prospectus included therein
or for additional information.

         E. Blue Sky Laws. Use its best efforts to register or qualify the
Common Stock covered by such Registration Statement under the securities or
blue sky laws of such jurisdictions as the managing underwriter of such
Distribution may reasonably request (excluding, however, any jurisdiction in
which the filing would subject the Company to additional tax liability and any
jurisdiction in which the Company would thereby be required to execute a
general consent to service of process) and use all reasonable efforts to do
such other acts and things as may be required to enable the Affected
Stockholders to consummate the public sale or other disposition in such
jurisdictions of the Registrable Shares owned by such Affected Stockholders.

         F. Earnings Statement. Make available to its holders of Common Stock,
as soon as reasonably practicable, an earnings statement covering the period of
at least 12 months, but not more than 18 months, beginning with the first month
after the effective date of the Registration Statement, which earnings
statement shall satisfy the provisions of Section 11(a) of the Securities Act.

         G. Amended Prospectuses. Notify each Affected Stockholder immediately
if the Company shall become aware at any time during the Effective Period that
the prospectus included in the Registration Statement, as such prospectus may
be amended or supplemented, includes an untrue statement of a material fact or
omits to state any material fact required to be stated therein or necessary in
order to make the statements therein not misleading in light of the
circumstances then existing, and at the request of any Affected Stockholder to
prepare promptly and to furnish to each Affected Stockholder such number of
copies of an amended or supplemental prospectus as may be necessary so that, as
thereafter delivered to the purchasers of such Registrable Shares, such
prospectus shall not include an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary in order to
make the statements therein not misleading in the light of the circumstances
then existing.

         H. Underwriting Agreements. Enter into such agreements (including an
underwriting agreement in customary form and containing customary provisions
relating to legal opinions and accountants' letters, representations and
warranties and mutual indemnification and contribution between the Company and
the underwriters for the Affected Stockholders) and use all reasonable efforts
to take such other actions as the Affected Stockholders may reasonably request
in order to expedite or facilitate the disposition of such Registrable Shares.

         I. Inspection. Make available for inspection by the Affected
Stockholders, by any underwriter participating in any distribution to be
effected pursuant to such Registration Statement and by any attorney,
accountant or other agent retained by the Affected Stockholders or any such
underwriter all pertinent financial and other records, pertinent corporate
documents and properties of the Company and cause all of the Company's
officers, directors and employees to supply all such

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-12

<PAGE>   123



information requested by the Affected Stockholders, such underwriter, attorney,
accountant or agent, as is reasonably needed in connection with such
Registration.

         6. Classes of Stock. The parties hereto intend that any capital stock
sold by a Stockholder pursuant to the provisions of this Agreement shall be
Class A Common Stock if sold prior to January 1, 2002 or Common Stock if sold
thereafter. Accordingly, subject to the proviso to Article Fourth, II-A-4, of
the Certificate of Incorporation of the Company, each Stockholder agrees to
convert any Class B Common Stock that is included as Registrable Shares in a
Registration Statement filed pursuant to any provision of this Agreement into
Class A Common Stock prior to the effective date of such Registration Statement
under the Securities Act.

         7. Expenses; Limitations on Registration. The Registration Expenses
relating to any Registration effected by the Company pursuant to this Agreement
shall be for the account of the Company; provided, however, that any and all
underwriting discounts and commissions attributable to the sale of the shares
of Common Stock of the Affected Stockholders shall be for the account of the
Affected Stockholders.

         For purposes of this Section 7, the Company shall be obligated to pay
the fees and expenses of only one law firm representing the Affected
Stockholders. If more than one such firm shall represent the Affected
Stockholders in connection with a Registration under this Agreement, the
Affected Stockholders shall notify the Company as to which firm shall be deemed
to represent the Affected Stockholders for purposes of this Section 7.

         Section 8.      Stockholders' Information. The Affected Stockholders
shall provide all information reasonably requested by the Company for inclusion
in any Registration Statement to be filed hereunder. The actual provision of
such information shall be a condition precedent to the obligation of the
Company to take any action pursuant to this Agreement in respect of the
Registration of Registrable Shares of any Affected Stockholder.

         Section 9.      Indemnification.

         A. In connection with the Registration of any Registrable Shares under
the Securities Act pursuant to this Agreement, the Company agrees to indemnify
and hold harmless each Affected Stockholder, its partners, directors, officers
and employees, and each other Person, if any, who controls such Affected
Stockholder within the meaning of Section 15 of the Securities Act, against any
losses, claims, damages or liabilities, joint or several, to which such
Affected Stockholder or any such partner, director, officer, employee or
controlling Person may become subject under the Securities Act or any other
statute or at common law, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon (i)
any untrue statement or any alleged untrue statement of a material fact
contained in the Registration Statement or the prospectus included therein at
the time the Registration Statement is declared effective or any omission or
alleged omission of a material fact required to be stated therein or necessary
in order to make the statements therein not misleading or (ii) any untrue
statement of a material fact or alleged untrue

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-13

<PAGE>   124



statement of a material fact contained in the Registration Statement, any
preliminary prospectus, the prospectus included therein or any amendment or
supplement thereto or any omission or alleged omission of a material fact
required to be stated therein or necessary in order to make the statements
concerning the Company therein, in the light of the circumstances under which
they were made, not misleading and shall reimburse each Affected Stockholder
and each such partner, director, officer, employee and controlling Person for
any legal or other expenses reasonably incurred by such Affected Stockholder or
such partner, director, officer employee or controlling Person in connection
with investigating or defending any such loss, claim, damage, liability or
action; provided, however, that the Company shall not be liable in any such
case to the extent that any such loss, claim, damage or liability arises out of
or is based upon any untrue statement or alleged untrue statement or omission
or alleged omission made in such Registration Statement, preliminary
prospectus, prospectus, or amendment or supplement in reliance upon and in
conformity with written information furnished by or on behalf of an Affected
Stockholder to the Company expressly for use therein; and provided, further,
that the Company shall not be liable in any such case to the extent that any
such loss, claim, damage, liability or expense arises out of or is based upon
an untrue statement or alleged untrue statement or omission or alleged omission
in any preliminary prospectus if such untrue statement or alleged untrue
statement or omission or alleged omission was corrected in the final prospectus
included in the Registration Statement at the time it became effective and the
Affected Stockholder, in the case of a Market Public Offering, or the managing
underwriter, in the case of an Underwritten Public Offering, failed to provide
the final prospectus as required by the Securities Act and the Securities Act
Rules. Such indemnity shall remain in full force and effect regardless of any
investigation made by or on behalf of any Affected Stockholder or any such
partner, director, officer, employee or controlling Person, and shall survive
the transfer of such securities by any Affected Stockholder.

         B. Each Affected Stockholder agrees to indemnify and hold harmless the
Company, its directors, officers and employees, each other Person, if any, who
controls the Company and each other Affected Stockholder against any losses,
claims, damages or liabilities, joint or several, to which the Company, any
such director, officer or employee, any such controlling Person or such other
Affected Stockholder may become subject under the Securities Act or any other
statute or at common law, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon (i)
any untrue statement or any alleged untrue statement of a material fact
contained in the Registration Statement or the prospectus included therein at
the time the Registration Statement is declared effective or any omission or
alleged omission of a material fact required to be stated therein or necessary
in order to make the statements therein not misleading or (ii) any untrue
statement of a material fact or alleged untrue statement of a material fact
contained in the Registration Statement, any preliminary prospectus, the
prospectus included therein or any amendment or supplement thereto or any
omission or alleged omission of a material fact required to be stated therein
or necessary in order to make the statements concerning the Company therein, in
the light of the circumstances under which they were made, not misleading, in
each case to the extent, but only to the extent, that such alleged untrue
statement or alleged omission was made in such Registration Statement,
preliminary prospectus, prospectus, amendment or supplement in reliance upon
and in conformity with written information furnished by or on behalf of an
Affected

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-14

<PAGE>   125


Stockholder to the Company expressly for use therein, and shall reimburse the
Company or such director, officer, employee or other Person for any legal or
any other expenses reasonably incurred in connection with investigating or
defending any such loss, claim, damage, liability or action.

         C. Promptly after receipt by an indemnified party hereunder of written
notice of the commencement of any action or proceeding involving a claim
referred to in subsection (A) or (B) of this Section 9, such indemnified party
will, if a claim in respect thereof is to be made against an indemnifying
party, give written notice to the latter of the commencement of such action;
provided, that the failure of any indemnified party to give notice as provided
herein shall not relieve the indemnifying party of its obligation under this
subsection C to the extent the indemnifying party is not materially prejudiced
by such failure. In case any such action is brought against an indemnified
party, the indemnified party shall permit the indemnifying party to assume the
defense of such action or proceeding, provided that counsel for the
indemnifying party, who shall conduct the defense of such action or proceeding,
shall be approved by the indemnified party (whose approval shall not be
unreasonably withheld) and the indemnified party may participate in such
defense (in which case, such participation shall be at such indemnified party's
expense, unless in such indemnified party's reasonable judgment a conflict of
interest between such indemnified party and the indemnifying party shall exist
in respect of such claim, in which event the indemnifying party shall pay the
reasonable fees and expense of separate counsel for the indemnified party). No
indemnifying party shall consent to entry of any judgment or enter into any
settlement that does not include as an unconditional term thereof the giving by
the claimant or plaintiff to such indemnified party of a release from all
liability in respect to such claim or litigation. The indemnifying party shall
not, in connection with any proceeding or related proceedings in the same
jurisdiction, be liable for the fees and expenses of more than one separate
firm for all indemnified parties. The indemnifying party shall not be liable
for any settlement of any proceeding effected without its written consent.

         D. Indemnification similar to that specified in the preceding
subsections of this Section 9 shall be given by the Company and each Affected
Stockholder (with such modifications as shall be appropriate) with respect to
liability related to any required registration or other qualification of
Registrable Shares under any Federal or state law or regulation of governmental
authority other than the Securities Act.

         E. If the indemnification provided for in this Section 9 is
unavailable or insufficient to hold harmless an indemnified party under
subsection (A) or (B) above, then the indemnifying party shall contribute to
the amount paid or payable by such indemnified party as a result of the losses,
claims, damages or liabilities referred to in subsection (A) or (B) above, in
such proportion as is appropriate to reflect the relative fault of the Company,
on the one hand, and each Affected Stockholder, on the other, in connection
with the statements or omissions that resulted in such losses, claims, damages
or liabilities, as well as any other relevant equitable considerations. The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by
the Company or such Affected Stockholder and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
untrue statement or omission.

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-15

<PAGE>   126



The Company and the Affected Stockholders agree that it would not be just and
equitable if contributions pursuant to this subsection (E) were to be determined
by pro rata allocation or by any other method of allocation that does not take
account of the equitable considerations referred to in the first sentence of
this subsection (E). The amount paid by an indemnified party as a result of the
losses, claims, damages or liabilities referred to in the first sentence of
this subsection (E) shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any action or claim (which shall be limited as provided in
subsection (C) above if the indemnifying party has assumed the defense of any
such action in accordance with the provisions thereof) that is the subject of
this subsection (E). Notwithstanding the provisions of this subsection (E), in
respect of any loss, claim, damage or liability based upon any untrue or
alleged untrue statement of a material fact or omission or alleged omission to
state a material fact that relates to information other than information
supplied by any Affected Stockholder, no Affected Stockholder shall be required
to contribute any amount in excess of the amount by which the total price at
which the Registrable Shares offered by it and distributed to the public
exceeds the amount of any damages that such Affected Stockholder has otherwise
been required to pay by reason of such untrue or alleged untrue statement or
omission or alleged omission. No Person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Act) shall be entitled to
contribution from any Person who was not guilty of such fraudulent
misrepresentation. Promptly after receipt by an indemnified party under this
subsection (E) of notice of the commencement of any action against such party
in respect of which a claim for contribution may be made against an
indemnifying party under this subsection (E), such indemnified party shall
notify the indemnifying party in writing of the commencement thereof if the
notice specified in subsection (C) above has not been given with respect to
such action; but the omission so to notify the indemnifying party shall not
relieve it from any liability which it may have to any indemnified party under
this subsection (E) to the extent such omission is not prejudicial.

         Section 10.     Public Availability of Information. The Company shall
comply with all applicable public information reporting requirements of the
Commission, to the extent required from time to time to enable each Stockholder
to sell Registrable Shares without Registration under the Securities Act within
the limitation of the exemptions provided by (i) Rule 144 under the Securities
Act, as such Rule may be amended from time to time, or (ii) any similar rule or
regulation hereafter adopted by the Commission. Upon the request of any
Stockholder, the Company will deliver to such Stockholder a written statement
as to whether it has complied with such requirements.

         Section 11.     Supplying Information. The Company shall cooperate with
each Stockholder in supplying such information as may be necessary for such
Stockholder to complete and file any information reporting forms presently or
hereafter required by the Commission as a condition to the availability of an
exemption from the Securities Act for the sale of any Registrable Shares.

         Section 12.     Specific Performance. Each party hereto acknowledges
and agrees that each other party hereto would be irreparably harmed and would
have no adequate remedy of law if any of the provisions of this Agreement were
not performed in accordance with their specific terms or were otherwise
breached. Accordingly, it is agreed that, in addition to any other remedies by
law

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-16

<PAGE>   127


or in equity which may be available, the parties hereto shall be entitled to
obtain preliminary and permanent injunctive relief with respect to any breach
or threatened breach of, or otherwise obtain specific performance of, the
covenants and other agreements contained in this Agreement.

         Section 13.     Representations and Warranties of the Company. The
Company represents and warrants to each Stockholder that, as of the date of
this Agreement, (a) the Company is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware and has
the corporate power and authority to enter into this Agreement and to carry out
its obligations hereunder, (b) the execution and delivery of this Agreement by
the Company and the consummation by the Company of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of the Company and no other corporate proceedings on the part of
the Company are necessary to authorize this Agreement or any of the
transactions contemplated hereby, and (c) this Agreement has been duly executed
and delivered by the Company and constitutes a valid and binding obligation of
the Company, and, assuming that this Agreement constitutes a valid and binding
obligation of each of the Designated Stockholders, is enforceable against the
Company in accordance with its terms, subject to applicable bankruptcy,
reorganization, insolvency, moratorium, fraudulent conveyance and similar laws
affecting creditors' rights generally from time to time and to general
principles of equity and except as the enforceability thereof may be limited by
considerations of public policy.

         Section 14.     Representations and Warranties. Each of the Designated
Stockholders represents and warrants to the Company that, as of the date of
this Agreement, (a) to the extent it is a legal entity, it is an organization
duly organized, validly existing and in good standing under the laws of the
jurisdiction of its organization and has the organizational power and authority
to enter into this Agreement and to carry out its obligations hereunder, (b) to
the extent it is a legal entity, the execution and delivery of this Agreement
by such Stockholder and the consummation by such Stockholder of the
transactions contemplated hereby have been duly authorized by all necessary
organizational action on the part of such Stockholder and no other
organizational proceedings on the part of such Stockholder are necessary to
authorize this Agreement or any of the transactions contemplated hereby and (c)
this Agreement has been duly executed and delivered by such Stockholder and
constitutes a valid and binding obligation of such Stockholder and, assuming
that this Agreement constitutes a valid and binding obligation of the Company,
is enforceable against such Stockholder in accordance with its terms, subject
to applicable bankruptcy, reorganization, insolvency, moratorium, fraudulent
conveyance and similar laws affecting creditors' rights generally from time to
time and to general principles of equity and except as the enforceability
thereof may be limited by considerations of public policy.

         Section 15.     Expiration. This Agreement and the rights, benefits,
duties and obligations hereunder of the parties hereto and their successors and
permitted assigns shall expire and be of no further force or effect on May 31,
2004.

         Section 16.     Notices. All notices and other communications hereunder
shall be in writing and shall be deemed given if delivered personally or
transmitted by telex, telegram or facsimile

                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-17

<PAGE>   128



transmission or mailed by registered or certified mail (return receipt
requested) to the parties at the following addresses (or at such other address
for a party as shall be specified by like notice):

         (a)      if to any Designated Stockholder, to such Designated
                  Stockholder at the address of such Designated Stockholder set
                  forth on Annex A hereto

                  with a copy to:
                  Reed Smith Shaw & McClay LP
                  One Liberty Place
                  Philadelphia, PA 19103
                  Attn.:  Ms. Lori L. Lasher
                  Facsimile: (215) 851-1420

         (b)      if to the Company, to:
                  NATCO Group, Inc.
                  Brookhollow Central III
                  2950 North Loop West
                  Suite 750
                  Houston, Texas 77092
                  Attn.:  Mr. Nathaniel A. Gregory, Chairman and Chief
                                    Executive Officer
                  Facsimile No.:  (713) 683-7814

                  with a copy to:
                  Vinson & Elkins L.L.P.
                  First City Tower
                  1001 Fannin Street
                  Houston, Texas 77002-6760
                  Attn.:  Mr. William E. Joor III
                  Facsimile No.:  (713) 615-5201

         Section 17.     Benefit and Assignment.

                  (a) The terms and conditions of this Agreement shall inure to
         the benefit of and be binding on the parties hereto and their
         respective successors and permitted assigns; provided, however, that,
         except as otherwise provided in this Section, this Agreement shall not
         be assignable by any party hereto except by operation of law or with
         the prior express written consent of the other parties hereto. Nothing
         in this Agreement, express or implied, is intended to confer upon any
         party, other than the parties hereto and their respective successors
         and permitted assigns, any rights, remedies, obligations or
         liabilities under or by reason of this Agreement.


                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-18


<PAGE>   129



                  (b) If any Designated Stockholder shall transfer and assign
         shares of Common Stock to any Person otherwise than in an Underwritten
         Public Offering (including any transfer on foreclosure of indebtedness
         secured by the grant of a security interest in such shares of Common
         Stock), such Designated Stockholder (or any Person who shall be a
         transferee or assignee pursuant to this subsection (b)), as the case
         may be, may assign such portion of its rights and benefits under this
         Agreement as is necessary to permit such Person to act as a
         Stockholder hereunder; provided, however, that such Person shall agree
         in writing to be bound by the duties and obligations of a Stockholder
         hereunder.

         Section 18.     Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard
to the application of doctrines of conflicts of law.

         Section 19.     Counterparts. This Agreement may be executed
simultaneously in one or more counterparts, any of which may have been
transmitted and received by facsimile transmission and each of which shall be
deemed to be an original but all of which together shall constitute one and the
same instrument.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed by their officers thereunto duly authorized.

                                 NATCO GROUP, INC.



                                 BY:
                                    -------------------------------------------
                                          Nathaniel A. Gregory
                                          Chairman and Chief Executive Officer

                                 THE DESIGNATED STOCKHOLDERS


                           ----------------------------------------------------
                                 William R. Dimeling


                           ----------------------------------------------------
                                 Robert J. Hamaker


                           ----------------------------------------------------
                                 Douglas P. Heller


                           ----------------------------------------------------
                                 George K. Hickox, Jr.


                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-19

<PAGE>   130




                           ----------------------------------------------------
                                 Ralph M. Kelly


                           ----------------------------------------------------
                                 Steven G. Park


                           ----------------------------------------------------
                                 Richard R. Schreiber


                           ----------------------------------------------------
                                 John C. Tuten, Jr.


                           THE 1998 TRUST FOR JODY SMITH HAMAKER


                             By:
                                -----------------------------------------------
                             Name:
                                  ---------------------------------------------
                             Title:
                                   --------------------------------------------


                           BANC ONE CAPITAL PARTNERS II, LTD.


                             By:
                                -----------------------------------------------
                             Name:  Earle J. Bensing
                             Title:    Authorized Signer


                          AGREEMENT AND PLAN OF MERGER

                                  ANNEX E-2-20
<PAGE>   131

                                                                         ANNEX F


                             STOCKHOLDERS' AGREEMENT

     This Stockholders' Agreement (this "Agreement") is made as of the 18th day
of November, 1998 by and among Capricorn Investors, L.P., a Delaware limited
partnership ("Cap I"), Capricorn Investors II, L.P., a Delaware limited
partnership ("Cap II"), NATCO Group Inc., a Delaware corporation ("Natco") and
each of the Designated Stockholders (as hereinafter defined).

                                R E C I T A L S:

     Natco is the owner of all the outstanding capital stock of National Tank
Company, a Delaware corporation ("National Tank"), and Natco, through National
Tank, is engaged in the business of designing, fabricating and servicing oil and
gas process equipment and systems.

     On November 18, 1998, the Certificate of Incorporation of Natco was amended
to authorize two classes of common stock, par value $0.01 per share ("Common
Stock"), to wit: 45,000,000 shares of Class A Common Stock ("Class A Common
Stock") and 5,000,000 shares of Class B Common Stock ("Class B Common Stock"),
and to convert each of the then outstanding shares of common stock of Natco into
one share of Class A Common Stock (the "Charter Amendment").

     As a result of the Charter Amendment, Cap I and Cap II, as the owners of
record and beneficially of all then outstanding Common Stock, acquired and now
own 5,563,667 shares and 2,582,259 shares of Class A Common Stock, respectively.

     Natco, National Tank, The Cynara Company, a Delaware corporation
("Cynara"), and Natco Acquisition Company, a Delaware corporation and a wholly
owned subsidiary of Natco ("Newco") are parties to an Amended and Restated
Agreement and Plan of Merger dated November 17, 1998 but effective as of March
26, 1998 (the "Merger Agreement") that, among other things, provides that Cynara
will merge, upon the terms and subject to the conditions of the Merger Agreement
and in accordance with the General Corporation Law of Delaware, with and into
National Tank and National Tank will be the Surviving Corporation (the
"Merger").

     On November 18, 1998, Natco and Cap II consummated the transaction
contemplated by that certain Investment Agreement dated November 17, 1998,
pursuant to which Natco issued and sold, and Cap II purchased, a non-negotiable
promissory note in the principal amount of $5,300,000 for a like amount of cash,
such note being automatically convertible into 504,762 shares of Class A Common
Stock of Natco upon expiration or termination of the waiting period under the
Hart-Scott- Rodino Antitrust Improvements Act of 1976, as amended.

     It is a condition to the obligations of Cynara under the Merger Agreement
that Cap I and Cap II and each of the Designated Stockholders shall have entered
into a Stockholders' Agreement substantially similar in form and substance to
this Agreement.


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-1


<PAGE>   132


     NOW, THEREFORE, in consideration of the premises, the mutual covenants
hereinafter expressed and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

     1. Definitions.

        "Affiliate" shall have the meaning ascribed to such term in Rule 12b-2
under the Exchange Act.

        "Agreement", "hereof", "hereunder", and words of similar import shall
refer to this Stockholders' Agreement, as it may be amended from time to time.

        "Associate" shall have the meaning ascribed thereto in Rule 405 of the
General Rules and Regulations under the Securities Act of 1933, as amended.

        "Cap I" shall mean Capricorn Investors, L.P., a Delaware limited
partnership.

        "Cap II" shall mean Capricorn Investors II, L.P., a Delaware limited
partnership.

        "Capricorn Registration Rights Agreement" shall mean that certain
Registration Rights Agreement dated as of November 18, 1998 among Natco, Cap I
and Cap II.

        "Charter Amendment" shall have the meaning ascribed to such term in the
second recital to this Agreement.

        "Class A Common Stock" shall have the meaning ascribed to such term in
the second recital to this Agreement.

        "Class B Common Stock" shall have the meaning ascribed to such term in
the second recital to this Agreement.

        "Code" shall mean the Internal Revenue Code of 1986, as amended.

        "Common Stock" shall have the meaning ascribed to such term in the
second recital to this Agreement.

        "Cynara" shall mean The Cynara Company, a Delaware corporation.

        "Designated Stockholder" shall mean each of the holders of record and
beneficially of common stock of Cynara immediately prior to the effective date
of the Merger (assuming the exercise of all outstanding Cynara warrants).

        "Drag-Along Notice" shall have the meaning ascribed to such term in
Section 2(f)(i) herein.


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-2


<PAGE>   133


        "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended.

        "Merger" shall have the meaning ascribed to such term in the fourth
recital to this Agreement.

        "Merger Agreement" shall have the meaning ascribed to such term in the
fourth recital to this Agreement.

        "Natco" shall mean NATCO Group Inc., a Delaware corporation.

        "National Tank" shall mean National Tank Company, a Delaware corporation
and a wholly owned subsidiary of Natco.

        "Overallotment Shares" shall have the meaning ascribed to such term in
Section 2(e)(ii) herein.

        "Person" means and includes natural persons, corporations, limited
partnerships, joint stock companies, joint ventures, associations, companies,
trusts, banks and other organizations, whether or not legal entities, and
governments and agencies and political subdivisions thereof.

        "Principal Stockholder" shall mean either Cap I or Cap II so long as it
owns of record and beneficially 1% or more of the outstanding Common Stock.

        "Public Sale" shall mean a Sale of Common Stock pursuant to an effective
registration statement under the Securities Act.

        "Purchase Offer" shall have the meaning ascribed to such term in Section
2(f) herein.

        "Purchaser" shall have the meaning ascribed to such term in Section 2(f)
herein.

        "Remaining Stockholders" shall have the meaning ascribed to such term in
Section 2(f)(i) herein.

        "Sale" shall mean any offer, offer to sell, offer for sale, sale,
assignment, contract of sale, disposition of an interest in or transfer, grant
of a participation in, pledge or other disposal of any Common Stock (or any
solicitation of any offers to buy or otherwise acquire, or take a pledge of, any
Common Stock).

        "Sale Notice" shall have the meaning ascribed to such term in Section
2(e)(i) herein.

        "Securities Act" shall mean the Securities Act of 1933, as amended.

        "Selling Principal Stockholder" shall have the meaning ascribed to such
term in Section 2(f) herein.


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-3


<PAGE>   134


        "Stockholder" shall mean, for so long as such Person owns of record any
shares of Common Stock, Cap I, Cap II, each Designated Stockholder and any
assignee thereof (or any other Person who shall acquire and hold of record
shares of Common Stock) who shall have agreed to be bound by the terms of this
Agreement.

     2. Restrictions on Certain Sales.

        (a) General Restrictions. The provisions of this Agreement, including
this Section 2, apply to all the holdings of Common Stock of each Stockholder,
whether held on the date of this Agreement or hereafter acquired, including
without limitation the shares of Class A Common Stock to be acquired by Cap II
upon conversion of the promissory note issued by Natco pursuant to the
Investment Agreement. Each Stockholder agrees that it will not, directly or
indirectly, effect a Sale of any Common Stock, except in compliance with the
Securities Act and this Agreement. No Stockholder shall effect a Sale other than
a Sale to Natco or another Stockholder, or a Public Sale, unless the Stockholder
first obtains a written opinion of counsel (which opinion and counsel, who may
be counsel for Natco, shall be reasonably satisfactory to Natco), to the effect
that the proposed Sale is exempt from registration under the Securities Act and
all applicable state securities laws.

        (b) Legend. Each certificate evidencing outstanding Common Stock issued
to any Stockholder shall bear a legend in substantially the following form:

            THE OFFERING, SALE AND DELIVERY OF THE SHARES REPRESENTED BY THIS
            CERTIFICATE WERE NOT REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
            AMENDED, AND THUS NEITHER SUCH SHARES NOR ANY INTEREST THEREIN MAY
            BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED, HYPOTHECATED OR OTHERWISE
            DISPOSED OF UNLESS SUCH TRANSACTION IS REGISTERED UNDER THAT ACT OR
            AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY IS PROVIDED TO THE
            COMPANY PRIOR TO THE PROPOSED TRANSACTION THAT REGISTRATION UNDER
            SUCH ACT IS NOT REQUIRED. THE SHARES REPRESENTED BY THIS CERTIFICATE
            ARE SUBJECT TO THE PROVISIONS OF A STOCKHOLDERS AGREEMENT DATED AS
            OF NOVEMBER 18, 1998, AS THE SAME MAY BE AMENDED (A COPY OF WHICH IS
            ON FILE WITH THE SECRETARY OF THE COMPANY), AND MAY NOT BE
            TRANSFERRED, SOLD, ASSIGNED, PLEDGED OR HYPOTHECATED UNLESS SUCH
            TRANSFER, SALE OR HYPOTHECATION COMPLIES WITH THE TERMS OF SUCH
            AGREEMENT.

        (c) Distributions of Common Stock. Each of Cap I and Cap II may
distribute, whether in liquidation or otherwise, all or part of the Common Stock
owned by it to any of its general or limited partners if each such general or
limited partner agrees in writing in connection


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-4


<PAGE>   135


with such distribution to be bound by all of the provisions of this Agreement
applicable by their terms to a Stockholder (other than a Principal Stockholder).

        (d) Specific Restrictions. Each Stockholder further agrees that it will
not effect any Sale, other than a Sale to Natco or another Stockholder, a Public
Sale or a Sale to a Purchaser pursuant to Section 2(f) herein, unless the Person
to whom such Sale is made shall have agreed in writing to be bound by all of the
provisions of this Agreement applicable by their terms to a Stockholder (other
than a Principal Stockholder). Any such transferee shall have all the rights and
benefits, and be subject to all the obligations, of this Agreement applicable by
its terms to a Stockholder. Any purported Sale that would contravene the
provisions of this Section 2(d) shall be null and void.

        (e) Right of First Refusal. Each Stockholder, other than either
Principal Stockholder, agrees not to effect a Sale, other than a Sale permitted
by clause (iv) of this subsection 2(e), unless, in any such case, prior to such
Sale:

            (i) Such Stockholder shall have given to Natco and to each Principal
     Stockholder that then holds Common Stock written notice (a "Sale Notice")
     of such Stockholder's intention to effect the Sale. The Sale Notice shall
     include (x) the number of shares of Common Stock that the Stockholder
     proposing the Sale desires to sell, (y) the principal terms of the Sale,
     including the price at which such shares of Common Stock are intended to be
     sold and such other information with respect to such Sale as Natco or
     either Principal Stockholder shall reasonably request in writing and (z) an
     offer to sell to Natco or either Principal Stockholder, on terms and
     conditions substantially identical to those contained in the Sale Notice, a
     number of shares of Common Stock determined in accordance with Section
     2(e)(ii) hereof.

            (ii) (A) Natco shall first have the right to purchase any number of
     shares of Common Stock up to the aggregate number of such shares of Common
     Stock that the selling Stockholder intends to sell in the Sale, and Natco
     shall promptly, but in any event within 10 days after receipt of the Sale
     Notice, advise the Selling Stockholder and each Principal Stockholder in
     writing of its determination in that regard.

                 (B) Each Principal Stockholder shall then have the right to
     purchase a number of shares of Common Stock included in the Sale equal to
     (x) the total number of shares of Common Stock included in the Sale less
     (y) the number of shares of Common Stock purchased by Natco pursuant to
     clause (A) above which result shall be (z) multiplied by a fraction, the
     numerator of which is the aggregate number of shares of Common Stock then
     held by such Principal Stockholder and the denominator of which is the
     aggregate number of shares of Common Stock then held by the Principal
     Stockholders who accept the offer made in the Sale Notice. If either
     Principal Stockholder under this clause (B) elects to purchase fewer than
     the maximum number of shares of Common Stock to which such Principal
     Stockholder is entitled pursuant to the preceding sentence, the other
     Principal Stockholder shall then be entitled to purchase the remaining
     number of shares of Common Stock (the "Overallotment Shares") to be
     included in the Sale. Each Principal Stockholder


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-5


<PAGE>   136


     shall advise the other, if any, in writing promptly, but in any event
     within 15 days after receipt of the Sale Notice, as to any Overallotment
     Shares available to the other for purchase.

            (iii) Within 20 days after receiving the Sale Notice, each Principal
     Stockholder desiring to accept the offer made therein shall so notify the
     selling Stockholder in writing, specifying the maximum number of shares of
     Common Stock that such Principal Stockholder wishes to purchase. If Natco
     or either Principal Stockholder does not, within the appropriate time
     period specified in subsection (e)(ii) or (e)(iii), so signify its
     intention to participate in the Sale, Natco or such Principal Stockholder
     as the case may be shall be deemed to have waived all of its rights under
     this Section 2(e) with respect to such Sale. If the aggregate of the number
     of shares of Common Stock that Natco and the Principal Stockholders have
     agreed to purchase pursuant to the allocation provisions of paragraph (ii)
     of this Section 2(e) shall be less than the number of shares of Common
     Stock included in the Sale Notice, Natco and the Principal Stockholders
     shall be deemed to have waived their rights under this Section 2(e) with
     respect to such Sale. If Natco and each Principal Stockholder waive their
     rights with respect to such Sale, the selling Stockholder shall thereafter
     be free, for a period of 90 days, to consummate such Sale for the number of
     shares of Common Stock set forth in the Sale Notice at a price not less
     than the price set forth in the Sale Notice and on terms otherwise no more
     favorable to the purchasers than as set forth therein.

            (iv) Anything to the contrary herein notwithstanding, the provisions
     of this subsection (e) shall not apply to a Sale to Natco or another
     Stockholder, a Public Sale or a Sale to a Purchaser pursuant to subsection
     2(f) herein. In addition, the provisions of this subsection (e) shall not
     apply to (A), subject to compliance with the provisions of subsection 2(d)
     herein, a Sale by any Stockholder to any Affiliate of such Stockholder or
     (B), subject to compliance with the provisions of subsection 2(c) herein,
     to a distribution, whether in liquidation or otherwise, by Cap I or Cap II
     to the limited and general partners thereof or (C), subject to compliance
     with the provisions of subsection 2(d) herein, in the case of a Stockholder
     who is an individual, to any transfer by operation of law, by death
     pursuant to a will or the laws of descent and distribution, by transfer to
     a member of the immediate family of such Stockholder or a trust for the
     benefit of any such family member or by transfer to a commercial bank or
     other lending institution in accordance with the terms of a bona fide
     pledge (including without limitation a pledge of Common Stock by Winokur
     (as such term is defined in the Capricorn Registration Rights Agreement)
     contemplated by Section 4 of the Capricorn Registration Rights Agreement)
     or (D), subject to compliance with the provisions of subsection 2(d)
     herein, in the case of a Stockholder that is a legal entity, by such entity
     to a successor of such entity or to the purchaser of all or substantially
     all of that entity's assets, each of which exceptions described in clauses
     (C) and (D) shall be permitted if the transferor or transferee shall give
     notice of such assignment, together with such information as may be
     reasonably necessary to evidence qualification of the transferee to be an
     assignee thereof, to Natco.

        (f) Rights to Compel Sale or to Offer Opportunity to Sell; Drag-Along
Rights; Tag-Along Rights. If a Principal Stockholder owning at least 10% of the
outstanding Common


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-6


<PAGE>   137


Stock (the "Selling Principal Stockholder") proposes to effect a Sale of all
shares of Common Stock held by it to a third party that is not an Affiliate or
Associate of Natco or either Principal Stockholder (the "Purchaser") for cash,
cash equivalents or readily marketable securities (the "Purchase Offer"), such
Selling Principal Stockholder shall consult with the other Principal
Stockholder, if any, and, after any such consultation, either (x), if the other
Principal Stockholder, if any, has agreed to sell all its shares of Common Stock
to the Purchaser on the same terms and conditions, require each and every other
Stockholder to sell or (y), if the other Principal Stockholder, if any, has not
agreed to sell all its shares of Common Stock to the Purchaser on the same terms
and conditions, offer each and every other Stockholder, including the other
Principal Stockholder, if any, the opportunity to sell, any and all shares of
Common Stock held by such Stockholders to the Purchaser, in each case, for the
same consideration per share and otherwise on the same terms and conditions upon
which the Selling Principal Stockholder proposes to sell its shares. If, at the
time a Selling Principal Stockholder proposes to effect a Sale pursuant to this
subsection (f), there is no other Principal Stockholder, the Selling Principal
Stockholder may, at its option, proceed in accordance with clause (x) or (y) of
this subsection (f).

            (i) Exercise of Right. The Selling Principal Stockholder shall cause
     the Purchase Offer to be reduced to writing and shall provide a written
     notice (the "Drag-Along Notice") in which it complies with the provisions
     of clauses (x) or (y) of this subsection (f) to each other Stockholder,
     including the other Principal Stockholder, if any (the other Stockholders,
     excluding the other Principal Stockholder, if any, being herein called the
     "Remaining Stockholders"). The Drag-Along Notice shall include information
     concerning the nature and amount of the consideration per share to be paid
     by the Purchaser and the other terms and conditions of the Purchase Offer.
     Any Sale pursuant to clause (x) of this subsection 2(f) shall entail all
     the outstanding shares of Common Stock owned by the Selling Principal
     Stockholder and the other Principal Stockholder, if any, and the Remaining
     Stockholders, but any Sale pursuant to clause (y) of this subsection 2(f)
     shall entail only those shares of Common Stock owned by the Selling
     Principal Stockholder and those owned by the Remaining Stockholders and the
     other Principal Stockholder, if any, to the extent that such Remaining
     Stockholders and the other Principal Stockholder, if any, have elected to
     participate in such Sale. No later than five business days before the
     closing date of the Sale set forth in either the Drag-Along Notice or in a
     subsequent notice from the Selling Principal Stockholder, each other
     Stockholder participating in the Sale pursuant to the provisions of clause
     (x) or (y) of this subsection (f) (a "Participating Stockholder") shall
     deliver to a representative of the Selling Principal Stockholder designated
     in the Drag-Along Notice or such subsequent notice certificates
     representing all the shares of Common Stock held by such Participating
     Stockholder to be sold in such Sale, duly endorsed in blank for transfer,
     with signatures guaranteed, together with all other documents required to
     be executed in connection with such Purchase Offer or, if such delivery is
     not permitted by applicable law, an unconditional agreement to deliver such
     shares of Common Stock pursuant to this subsection (f) at the closing of
     such Sale against delivery to such Participating Stockholder of the
     consideration therefor. If any Participating Stockholder shall fail to
     deliver such certificates to the Selling Principal Stockholder, Natco shall
     cause its books and records to show that such shares of Common Stock are
     bound by the provisions of this subsection (f)


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-7


<PAGE>   138


     and that such shares of Common Stock shall be transferred only to the
     Purchaser upon surrender thereof for transfer by the Participating
     Stockholder.

            (ii) Return of Stock. If, for any reason the Selling Principal
     Stockholder determines that it cannot complete the sale of all the shares
     of Common Stock, the Selling Principal Stockholder shall return to each
     Participating Stockholder all certificates representing shares of Common
     Stock that such Participating Stockholder delivered for sale pursuant
     hereto, together with all other documents delivered pursuant hereto by such
     Participating Stockholder, and all the restrictions on sale or other
     disposition contained in this Agreement with respect to such shares of
     Common Stock shall continue in effect.

            (iii) Remittance of Consideration. At the closing of the sale of all
     shares of Common Stock pursuant to this subsection 2(f), the consideration
     with respect to the shares of Common Stock of any Participating
     Stockholders sold pursuant hereto shall be paid directly to each such
     Participating Stockholder pursuant to written instructions of such
     Participating Stockholder. The Selling Principal Stockholder shall furnish
     such other evidence of the completion and time of completion of such Sale
     and the terms thereof as may be reasonably requested by such Participating
     Stockholders.

            (iv) No Liability. Notwithstanding anything contained in this
     subsection 2(f), there shall be no liability on the part of the Selling
     Principal Stockholder to any Participating Stockholder if the Sale of
     shares of Common Stock pursuant to this subsection 2(f) is not consummated
     for whatever reason and, in such circumstances, the Selling Principal
     Stockholder's only obligation shall be to return the shares of Common Stock
     and other documents to the Participating Stockholders as contemplated by
     clause (ii) of this subsection 2(f). Whether to effect a sale of shares of
     Common Stock pursuant to this subsection 2(f) shall be in the sole and
     absolute discretion of the Selling Principal Stockholder.

            (v) Costs. All costs and expenses incurred by any seller in
     connection with a Sale pursuant to this subsection 2(f), including without
     limitation all attorneys' fees, costs and disbursements and any finders'
     fees or brokerage commissions, shall be allocated pro rata among the
     sellers, with each bearing that portion of such costs and expenses equal to
     a fraction, the numerator of which shall be the amount of the gross
     proceeds received by such seller from such Sale, and the denominator of
     which shall be the total amount of the gross proceeds received by all
     sellers from such Sale.

        (g) Inapplicability and Termination of Certain Provisions. The
provisions contained in subsections (c), (d), (e) and (f) of this Section 2,
including without limitation all restrictions on the ability of any Stockholder
to effect a Sale as set forth in subsection (d) or (e) of this Section 2, shall
be inapplicable to the sale of Class A Common Stock or Common Stock by Natco and
any Stockholder in the initial public offering thereof and shall terminate and
be of no further force or effect at such time as Natco is required to file
reports pursuant to Section 13 or Section 15(d) of the Exchange Act.


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-8


<PAGE>   139


     3. Related Party Transactions. So long as either Principal Stockholder
continues to own more than 10% of the outstanding Common Stock and except as
contemplated hereby or as the other Stockholders shall consent thereto in
writing, such Principal Stockholder shall not engage in any financial
transaction with Natco unless each other Stockholder has been offered the right
to participate in such transaction proportionately in accordance with such
Stockholder's ownership of Common Stock; provided, however, that this Section 3
shall not apply to the conversion of the Promissory Note (as such term is
defined in that certain Investment Agreement dated as of November 17, 1998
between Natco and Capricorn Investors II, L.P.).

     4. Specific Performance.

        The parties hereto each acknowledge and agree that, in the event of any
breach of this Agreement, each non-breaching party would be irreparably harmed
and could not be made whole by monetary damages. It is accordingly agreed that
such parties, in addition to any other remedy to which they may be entitled at
law or in equity, shall be entitled to compel specific performance of this
Agreement in any action instituted in the United States District Court for the
Southern District of New York, or, in the event such court would not have
jurisdiction for such action, in any court of the United States or any state
having subject matter jurisdiction. The parties hereto each consent to personal
jurisdiction in any such action brought in the United States District Court for
the Southern District of New York.

     5. Entire Agreement; Amendments.

        This Agreement supercedes all prior agreements and understandings among
the parties with respect to its subject matter, including without limitation
that certain Stockholders' Agreement dated as of June 30, 1997 among Cummings
Point Industries, Inc., a Delaware corporation (now NATCO Group, Inc.), Cap I
and Cap II which is hereby terminated and rendered of no further force or
effect. This Agreement contains the entire understanding of the parties with
respect to the subject matter of this Agreement. There are no restrictions,
agreements, promises, warranties, covenants, or undertakings other than those
expressly set forth herein or therein. This Agreement may not be amended except
by an instrument in writing signed on behalf of all of the parties hereto. Any
agreement on the part of a party hereto to any extension or waiver shall be
valid only if set forth in an instrument in writing signed on behalf of such
party.

     6. Interpretation.

        The section and paragraph headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Whenever reference is made herein to specific
numbers of shares of stock (as opposed to percentages, proportions and like
ratable computations) such numbers shall, in the event of any stock split, stock
dividend, reclassification or similar event, be appropriately adjusted to
reflect the impact of such event upon such number of shares.


                          AGREEMENT AND PLAN OF MERGER

                                    ANNEX F-9


<PAGE>   140


     7. Notice.

        All notices and other communications hereunder shall be in writing and
shall be given by hand delivery to the other party or by registered or certified
mail, return receipt requested, postage prepaid, or by facsimile copy, receipt
of which has been acknowledged, addressed as follows:

        To Natco:                NATCO Group Inc.
                                 Brookhollow Central III
                                 2950 North Loop West
                                 Houston, Texas 77092
                                 Attention:  Nathaniel A. Gregory
                                             Chairman of the Board and
                                             Chief Executive Officer
                                 Telecopy No.:  713/683-7841

        To Cap I:                Capricorn Investors, L.P.
                                 c/o Winokur Holdings, Inc.
                                 30 East Elm Street
                                 Greenwich, Connecticut 06830
                                 Attention:  Herbert S. Winokur, Jr.
                                             President
                                 Telecopy No.:  203/861-6671

        To Cap II:               Capricorn Investors II, L.P.
                                 c/o Capricorn Holdings, LLC
                                 30 East Elm Street
                                 Greenwich, Connecticut 06830
                                 Attention:  Herbert S. Winokur, Jr.
                                             Manager
                                 Telecopy No.:  203/861-6671

        To the Designated        c/o George K. Hickox, Jr.
               Stockholders:     Heller, Hickox, Dimeling, Schreiber & Park
                                 1629 Locust Street
                                 Philadelphia, Pennsylvania 19103
                                 Telecopier No.:  215/546-1041

or to such other address as either party shall have furnished to the other in
writing in accordance herewith. Notices and communications hereunder shall be
effective when actually received by the addressee.

     8. Termination.

        This Agreement shall terminate in its entirety on the earlier of the
tenth anniversary of the date hereof and the date on which less than fifty
percent (50%) of the outstanding Common Stock shall be held of record, in the
aggregate, by Cap I, Cap II, each Person who is as of the date of this Agreement
or prior to the liquidation and dissolution, if any, of Cap I or Cap II, was a
general


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX F-10


<PAGE>   141


or limited partner of Cap I and Cap II, the Designated Stockholders, Nathaniel
A. Gregory and their affiliates.

     9.  Governing Law.

         This Agreement shall be governed by and construed in all respects in
accordance with the laws of the State of New York, without regard to the
principles of conflicts of laws thereof which might refer such interpretation to
the laws of a different state or jurisdiction.

     10. Counterparts.

         This Agreement may be executed simultaneously in one or more
counterparts, any of which may have been transmitted and received by facsimile
transmission and each of which shall be deemed to be an original but all of
which together shall constitute one and the same instrument.



             (The remainder of this page intentionally left blank.)


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX F-11


<PAGE>   142


     IN WITNESS WHEREOF, this Agreement has been duly executed and delivered as
of the date first above written.


                                       NATCO GROUP INC.

                                       By:
                                           -------------------------------------
                                       Title:
                                              ----------------------------------

                                       CAPRICORN INVESTORS, L.P.

                                       By: Capricorn Holdings, G.P.,
                                           its general partner

                                       By: Winokur Holdings, Inc.,
                                           its general partner

                                       By:
                                           -------------------------------------
                                           Herbert S. Winokur, Jr.
                                           President

                                       CAPRICORN INVESTORS II, L.P.

                                       By: Capricorn Holdings, LLC,
                                           its general partner

                                       By:
                                           -------------------------------------
                                           Herbert S. Winokur, Jr.
                                           Manager

                                       DESIGNATED STOCKHOLDERS

                                       -----------------------------------------
                                       William R. Dimeling

                                       -----------------------------------------
                                       Robert J. Hamaker

                                       -----------------------------------------
                                       Douglas P. Heller


                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX F-12


<PAGE>   143


                                       -----------------------------------------
                                       George K. Hickox, Jr.

                                       -----------------------------------------
                                       Ralph M. Kelly

                                       -----------------------------------------
                                       Steven G. Park

                                       -----------------------------------------
                                       Richard R. Schreiber

                                       -----------------------------------------
                                       John C. Tuten, Jr.


                                       THE 1998 TRUST FOR JODY SMITH HAMAKER


                                       By:
                                           -------------------------------------
                                       Name:
                                       Title:


                                       BOCP II, L.L.C.


                                       By:
                                           -------------------------------------
                                       Name:  Earle J. Bensing
                                       Title: Authorized Signer

                          AGREEMENT AND PLAN OF MERGER

                                   ANNEX F-13
<PAGE>   144
                                                                       EXHIBIT I

EXAMPLE #1

CTOC project is awarded to Cynara 12/98
Billed revenues by quarter as follows:

Quarter ending 3/31/99       $3,000,000
Quarter ending 6/30/99       $8,000,000
Quarter ending 9/30/99      $11,000,000

Total contract sales revenue $67,000,000. No other SE Asia contracts awarded.

                                                                   CYNARA GROUP
                                                                   NATCO CLASS B
                                                                   SHAREHOLDINGS

A.   Shares conveyed at closing not subject to escrow,
     (Section 3.01 (a) in the Amended and Restated
     Plan of Merger "ARPM")                                              500,000

B.   Shares released from escrow on 9/30/99 or as soon
     thereafter as reasonably practicable equal to the
     lesser of 450,000 or ($3,000,000 + $8,000,000 +
     $11,000,000)/1,000 = 22 shares/$ = 484,000)                       450,000
     (Section 7.10 in the ARPM)

C.   Shares earned under the "CTOC Earnout Shares"
     provision equal to the lesser of 140,000 shares
     (2.73 shares per fully diluted Cynara share) or
     ($3,000,000 + $8,000,000 + $11,000,000 -
     $20,454,545)/1000 * 22 shares/$ (Annex A,
     definition, in the ARPM) issued on "CTOC Payout
     Date" 11/30/99 (Section 3.01(a) in the ARPM)                         34,000

D.   Shares earned under the "Additional Shares"
     provision and issued on the "Initial Payment Date",
     5/31/00 (Annex A and Section 3.01(a) of the ARPM)
     $67,000,000 / 176.06 shares/$                                       380,552

E.   Shares earned under the "Supplemental Shares"
     provision and issued on the Supplemental Payout
     Date 2/28/01 (Annex A and Section 3.01(a) of the ARPM)                    0


                                     TOTAL                             1,364,552
                                                                       ---------

                                   Exhibit I
                                      -1-
<PAGE>   145
EXAMPLE #2


CTOC project is awarded to Cynara 12/98
Billed revenues by quarter as follows:

Quarter ending 3/31/99     $5,000,000
Quarter ending 6/30/99    $10,000,000
Quarter ending 9/30/99    $15,000,000

Total contract sales revenue $67,000,000. No other SE Asia contracts awarded.

<TABLE>
<CAPTION>
                                                               CYNARA GROUP
                                                               NATCO CLASS B
                                                               SHAREHOLDINGS


<S>                                                            <C>
A.  Shares conveyed at closing not subject to escrow.
    (Section 3.01 (a) in the Amended and Restated Plan of
    Merger ("ARPM")                                               500,000

B.  Shares released from escrow on 9/30/99 or as soon
    thereafter as reasonably practicable equal to the
    lesser of 450,000 or ($5,000,000 + $10,000,000 +
    $15,000,000) divided by 1000 * 22 shares/$ = 660,000)
    (Section 7.10 in the ARPM)                                    450,000

C.  Shares earned under the "CTOC Earnout Shares" provision
    equal to the lesser of 140,000 shares (2.73 shares per
    fully diluted Cynara share) or ($5,000,000 + $10,000,000 +
    $15,000,000) - $20,454,545) divided by 1000 * 22 shares/$
    = 210,000) shares (Annex A, definition, in the ARPM) issued
    on "CTOC Payout Date" 11/30/99 (Section 3.01(a) in the
    ARPM)                                                         140,000

D.  Shares earned under the "Additional Shares" provision
    and issued on the "Initial Payment Date", 5/31/00 (Annex
    A and Section 3.01(a) of the ARPM) $67,000,000 divided by
    176.06 shares/$                                               380,552

E.  Shares earned under the "Supplemental Shares" provision
    and issued on the Supplemental Payout Date 2/28/01
    (Annex A and Section 3.01(a) of the ARPM)                           0


                                    TOTAL                       1,470,552
                                                                =========
</TABLE>


                                   Exhibit I

                                      -2-
<PAGE>   146
EXAMPLE #3


CTOC project is awarded to Cynara 12/98
Billed revenues by quarter as follows:

Quarter ending 3/31/99  $ 5,000,000
Quarter ending 6/30/99  $10,000,000
Quarter ending 9/30/99  $15,000,000

Total contract sales revenue $67,000,000. Three other SE Asia contracts awarded
between 4/1/00 and 12/31/00 with sales revenue of $200,000,000.


<TABLE>
<CAPTION>
                                                                          CYNARA GROUP
                                                                          NATCO CLASS B
                                                                          SHAREHOLDINGS
<S>                                                                       <C>
A. Shares conveyed at closing not subject to escrow.
   (Section 3.01(a) in the Amended and Restated Plan of
   Merger "ARPM")                                                               500,000

B. Shares released from escrow on 9/30/99 or as soon thereafter
   as reasonably practicable equal to the lesser of 450,000 or
   ($5,000,000 + $10,000,000 + $15,000,000) / 1000 * 22 shares/$
   = 660,000)                                                                   450,000
   (Section 7.10 in the ARPM)

C. Shares earned under the "CTOC Earnout Shares" provision equal
   to the lesser of 140,000 shares (2.73 shares per fully diluted
   Cynara Share) or ($5,000,000 + $10,000,000 + $15,000,000 -
   $20,454,545) / 1000 * 22 shares/$ = 210,000 shares (Annex A,
   definition, in the ARPM) issued on "CTOC Payout Date" 11/30/99
   (Section 3.01(a) in the ARPM)                                                140,000

D. Shares earned under the "Additional Shares" provision and issued
   on the "Initial Payment Date", 5/31/00 (Annex A and Section 3.01(a)
   of the ARPM)
   $67,000,000 / 176.06 shares/$                                                380,552

E. Shares earned under the "Supplemental Shares" provision and issued
   on the Supplemental Payout Date 2/28/01 (Annex A and Section 3.01(a)
   of the ARPM) $200,000,000 / 352.11 shares/$ = 568,004 shares; however,
   this earnout is subject to an overall limitation on total C + D + E
   shares of 18.525 shares of Acquiror Class B stock per fully diluted
   Cynara share = 950,000 shares                                                429,448

                                             TOTAL                            1,900,000
                                                                              ---------
</TABLE>

                                   Exhibit I
                                      -3-
<PAGE>   147
EXAMPLE #4


CTOC project is awarded to Cynara 12/98
Billed revenues by quarter as follows:

Quarter ending 3/31/99   $2,000,000
Quarter ending 6/30/99   $3,000,000
Quarter ending 9/30/99   $3,000,000

Total contract sales revenue $67,000,000. Three other SE Asia contracts awarded
between 4/1/00 and 12/31/00 with sales revenue of $200,000,000.


<TABLE>
<CAPTION>

                                                                                      CYNARA GROUP
                                                                                     NATCO CLASS B
                                                                                     SHAREHOLDINGS

<S>                                                                                  <C>
A.  Shares conveyed at closing not subject to escrow. (Section 3.01 (a) in the
    Amended and Restated Plan of Merger "ARPM")                                        500,000

B. Shares released from escrow on 9/30/99 or as soon as thereafter
   as reasonably practicable equal to the lesser of 450,000 or
   ($2,000,000+$3,000,000+$3,000,000) divided by 1000*22 shares/$=176,000)             176,000
   (Section 7.10 in the ARPM)

C. Shares earned under the "CTOC Earnout Shares" provision equal
   to the lesser of 140,000 shares (2.73 shares per fully diluted Cynara share)
   or ($2,000,000+$3,000,000+$3,000,000-$20,454,545)
   /1000 * 22 shares/$=0 shares (Annex A, definition, in the ARPM)
   issued on "CTOC Payout Date" 11/30/99 (Section 3.01(a) in the ARPM)                       0


D. Shares earned under the "Additional Shares" provision and issued
   on the "Initial Payment Date", 5/31/00 (Annex A and Section 3.01(a)
   of the ARPM)
   $67,000,000 divided by 176.06 shares/$                                              380,552

E. Shares earned under the "Supplemental Shares" provision and issued on the
   Supplemental Payout Date 2/28/01 (Annex A and Section 3.01(a) of the ARPM)
   $200,000,000/352.11 shares/$ = 568,004 shares; however, this earnout is
   subject to an overall limitation on total C+D+E shares of 18.525 shares
   of Acquiror Class B stock per fully diluted Cynara share = 950,000 shares           568,004

                                              TOTAL                                  1,624,556
                                                                                     ---------

</TABLE>

This example illustrates a.) No negative shares can be calculated in C. above;
and b.) C + D + E is not limited by cancellation of escrow shares due to not
reaching ceiling in calculation B. above.



                                   Exhibit I
                                      -4-

<PAGE>   1
                                                                     EXHIBIT 3.1


                     RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                                NATCO GROUP INC.

         FIRST:  The name of the corporation is NATCO Group Inc.

         SECOND: The address of the registered office of the Corporation in the
State of Delaware is The Corporation Trust Company, 1209 Orange Street in the
City of Wilmington, County of New Castle. The name of its registered agent at
that address is The Corporation Trust Company.

         THIRD:  The purpose of the Corporation is to engage in any lawful act
or activity for which a corporation may be organized under the General
Corporation Law of the State of Delaware as set forth in Title 8 of the
Delaware Code.

         FOURTH: The aggregate number of shares of capital stock that the
Corporation shall have authority to issue is 55,000,000 shares, of which
5,000,000 shall be shares of Preferred Stock, par value $.01 per share
("Preferred Stock"), and 50,000,000 shall be shares of Common Stock, par value
of $.01 per share ("Common Stock").

         The following is a statement fixing certain of the designations and
powers, voting powers, preferences, and relative, participating, optional or
other rights of the Preferred Stock and the Common Stock of the Corporation,
and the qualifications, limitations or restrictions thereof, and the authority
with respect thereto expressly granted to the Board of Directors of the
Corporation:

         I.      Preferred Stock

                 The Board of Directors is hereby expressly vested with the
         authority to adopt a resolution or resolutions providing for the
         issuance of authorized but unissued shares of Preferred Stock, which
         shares may be issued from time to time in one or more series and in
         such amounts as may be determined by the Board of Directors in such
         resolution or resolutions. The voting powers, full or limited, or no
         voting powers, and such designations, preferences, and relative,
         participating, optional or other special rights, if any, of each
         series of Preferred Stock and the qualifications, limitations or
         restrictions, if any, of such preferences and/or rights (collectively
         the "Series Terms"), shall be such as are stated and expressed in a
         resolution or resolutions providing for the creation or revision of
         such Series Terms (a "Preferred Stock Series Resolution") adopted by
         the Board of Directors.

                 Any of the Series Terms, including voting rights, of any series
         may be made dependent upon facts ascertainable outside this
         Certificate of Incorporation and the Preferred Stock Series
         Resolution, provided that the manner in which such facts shall operate
         upon such Series Terms is clearly and expressly set forth in this
         Certificate of Incorporation or in the Preferred Stock Series
         Resolution.
<PAGE>   2



                  Except in respect of characteristics of a particular series
         fixed by the Board of Directors, all shares of Preferred Stock shall
         be of equal rank and shall be identical. All shares of any one series
         of Preferred Stock so designated by the Board of Directors shall be
         alike in every particular, except that shares of any one series issued
         at different times may differ as to the dates from which dividends
         thereon shall be cumulative,

         II.      Common Stock

                  1. Dividends. Subject to the provisions of any Preferred Stock
         Series Resolution, the Board of Directors may, in its discretion, out
         of funds legally available for the payment of dividends and at such
         times and in such manner as determined by the Board of Directors,
         declare and pay dividends on the Common Stock.

                  2. Liquidation. In the event of any liquidation, dissolution
         or winding up of the Corporation, whether voluntary or involuntary,
         after payment or provision for payment of the debts and other
         liabilities of the Corporation and payment or setting aside for
         payment of any preferential amount due to the holders of any other
         class or series of stock, the holders of the Common Stock shall be
         entitled to receive ratably any or all assets remaining to be paid or
         distributed,

                  3. Voting Rights. Except as may otherwise be required by law,
         this Certificate of Incorporation or the provisions of any Preferred
         Stock Series Resolution, each holder of Common Stock shall have one
         vote for each share of such stock held by such holder on each matter
         voted upon by the stockholders.

         III.     No Preemptive Rights

                  No holder of shares of stock of the Corporation shall have any
         preemptive or other rights, except as such rights are expressly
         provided by contract, to purchase or subscribe for or receive any
         shares of any class, or series thereof, of stock of the Corporation,
         whether now or hereafter authorized, or any warrants, options, bonds,
         debentures or other securities convertible into, exchangeable for or
         carrying any right to purchase any shares of any class, or series
         thereof, of stock.

         FIFTH:   The Board of Directors shall have the power to adopt, amend or
repeal the bylaws of the Corporation, except as may otherwise be provided in
the bylaws.

         SIXTH:   Meetings of stockholders may be held within or without the
State of Delaware, as the bylaws of the Corporation may provide. The books of
the Corporation may be kept (subject to any provision contained in applicable
law) outside the State of Delaware at such place as may be designated from time
to time by the Board of Directors or the bylaws of the Corporation,

         SEVENTH: The Corporation reserves the right to amend, alter, change or
repeal any provision contained in the Certificate of Incorporation, in the
manner now or hereafter prescribed by statute, and all rights conferred upon
stockholders herein are granted subject to this reservation.

                                       2
<PAGE>   3

         EIGHTH:   No action required or permitted by the Delaware General
Corporation Law to be taken at any annual or special meeting of the
stockholders of the Corporation may be taken without a meeting, pursuant to
Section 228 of the Delaware General Corporation Law or otherwise, unless a
consent or consents in writing, setting forth the action so taken, shall be
signed by the holders of all the outstanding capital stock entitled to vote
with respect to such matter if the matter had been presented at an annual or
special meeting of stockholders of the Corporation duly called and convened.

         NINTH:    Whenever a compromise or arrangement is proposed between this
Corporation and its creditors or any class of them and/or between this
Corporation and its stockholders or any class of them, any court of equitable
jurisdiction within the State of Delaware may, on the application in a summary
way of this Corporation or of any creditor or stockholder thereof or on the
application of any receiver or receivers appointed for this Corporation under
the provisions of Section 291 of Title 8 of the Delaware Code or on the
application of trustees in dissolution or of any receiver or receivers
appointed for this Corporation under the provisions of Section 279 of Title 8
of the Delaware Code order a meeting of the creditors or class of creditors
and/or of the stockholders or class of stockholders of this Corporation, as the
case may be, to be summoned in such manner as the said court directs. If a
majority in number representing three-fourths in value of the creditors or
class of creditors and/or of the stockholders or class of stockholders of this
Corporation, as the case may be, agree to any compromise or arrangement and to
any reorganization of this Corporation as a consequence of such compromise or
arrangement, the said compromise or arrangement and the said reorganization
shall, if sanctioned by the court to which the said application has been made,
be binding on all the creditors or class of creditors and/or on all the
stockholders or class of stockholders of this Corporation, as the case may be,
and also on this Corporation.

         TENTH:    To the fullest extent permitted by the Delaware General
Corporation Law as the same exists or may hereafter be amended, a director of
this Corporation shall not be liable to the Corporation or its stockholders for
monetary damages for breach of fiduciary duty as a director.

         ELEVENTH: The Corporation may indemnify any director, officer,
employee or agent of the Corporation to the fullest extent permitted by the
Delaware General Corporation Law as the same exists or may hereafter be
amended.

         TWELFTH:  The number of directors which shall constitute the whole
board shall be such as from time to time shall be fixed in the manner provided
in the bylaws of the Corporation or, in the absence of any such provision, by
resolution of the Board of Directors, but in no case shall the number be less
than three.

         The right to cumulate votes in the election of directors is expressly
prohibited.

         The election of directors shall be by written ballot.

         The directors shall be classified with respect to the time for which
they shall severally hold office by dividing them into three classes, which
classes shall consist of an equal, or as near to equal as possible, number of
directors. At the first election of directors following the effective time of
the

                                       3
<PAGE>   4

certificate of amendment to the certificate of incorporation of the Corporation
reflecting this Article, the director or directors of the first class shall be
elected for a term expiring at the next succeeding annual meeting of
stockholders to be held in 1999; the director or directors of the second class
for a term expiring at the annual meeting to be held in 2000; and the director
or directors of the third class for a term expiring at the annual meeting to be
held in 2001.  At each annual meeting, commencing with the annual meeting in
1999, the successor or successors to the class of directors whose term shall
expire in that year shall be elected to hold office for the term of three
years, so that the term of office for one class of directors shall expire in
each year. Any increase or decrease in the number of directors constituting the
Board shall be apportioned among the classes so as to maintain the number of
directors in each class as near as possible to one-third of the whole number of
directors as so adjusted. Any director elected or appointed to fill a vacancy
shall hold office for the remaining term of the class to which such
directorship is assigned. No decrease in the number of directors constituting
the Corporation's Board of Directors shall shorten the term of any incumbent
director. Any vacancy in the Board of Directors, whether arising through death,
resignation or removal of a director, or through an increase in the number of
directors of any class, shall be filled by the majority vote of the remaining
directors, although less than a quorum, or by a sole remaining director. The
bylaws may contain any provision regarding classification of the Corporation's
directors not inconsistent with the terms hereof.

         Notwithstanding the foregoing, whenever the holders of any one or more
classes or series of Preferred Stock issued by the Corporation shall have the
right, voting separately by class or series, to elect directors at an annual or
special meeting of stockholders, the election, term of office, filling of
vacancies and other features of such directorships shall be governed by the
terms of the Preferred Stock Series Resolutions applicable thereto, and such
directors so elected shall not be subject to the provisions of this Article
Twelfth unless expressly provided by such terms.

                                       4
<PAGE>   5
                                                                     EXHIBIT 3.1

                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                                NATCO GROUP INC.


         THE UNDERSIGNED SENIOR VICE PRESIDENT AND CHIEF FINANCIAL OFFICER OF
NATCO GROUP INC., A DELAWARE CORPORATION (THE "CORPORATION"), DOES HEREBY
CERTIFY:

         I. That the Board of Directors of the Corporation adopted at a meeting
duly called and held resolutions setting forth proposed amendments of the
Certificate of Incorporation of the Corporation, approving such amendments,
declaring such amendments advisable and recommending such amendments to the
stockholders of the Corporation for approval thereof. The resolutions setting
forth the proposed amendments are as follows:

         RESOLVED, that the first paragraph of Article Fourth of the Certificate
of Incorporation of the Corporation be amended so as to be and read in its
entirety as follows:

                  FOURTH: The aggregate number of shares of capital stock that
         the Corporation shall have authority to issue is 55,000,000 shares, of
         which 5,000,000 shall be shares of Preferred Stock, par value $.01 per
         share ("Preferred Stock"), and 50,000,000 shall be shares of Common
         Stock, par value of $.01 per share ("Common Stock"), divided into
         45,000,000 shares of Class A Common Stock ("Class A Common Stock") and
         5,000,000 shares of Class B Common Stock ("Class B Common Stock").

and further

         RESOLVED, that Section II of Article Fourth of the Certificate of
Incorporation of the Corporation be amended so as to be and read in its entirety
as follows:

         II. Common Stock

                           The Common Stock of the Corporation shall consist of
         two classes: Class A Common Stock and Class B Common Stock. Each such
         class of Common Stock shall have the relative rights, powers,
         preferences, limitations and restrictions set forth in this Section II:

                  A.   Class A Common Stock and Class B Common Stock.

                           1. Dividends. Subject to the provisions of any
                  Preferred Stock Series Resolution, the Board of Directors may,
                  in its discretion, out of funds legally available for the
                  payment of dividends and at such times and in such manner as
                  determined by the Board of Directors, declare and pay
                  dividends on the Class A


<PAGE>   6


                  Common Stock and the Class B Common Stock, equally and
                  ratably as if such classes were but a single class.

                           2. Liquidation. In the event of any liquidation,
                  dissolution or winding up of the Corporation, whether
                  voluntary or involuntary, after payment or provision for
                  payment of the debts and other liabilities of the Corporation
                  and payment or setting aside for payment of any preferential
                  amount due to the holders of any other class or series of
                  stock, the holders of the Class A Common Stock and Class B
                  Common Stock shall be entitled to receive any or all assets
                  remaining to be paid or distributed, equally and ratably as if
                  such classes were but a single class; provided, however, that,
                  if any obligation of the Corporation to purchase shares of
                  Class B Common Stock pursuant to the exercise of a Put is then
                  pending, then upon any voluntary or involuntary liquidation,
                  dissolution, or winding-up of the Corporation, the holders of
                  Class B Common Stock at the time outstanding will be entitled
                  to receive out of the net assets of the Corporation legally
                  available for distribution to shareholders after satisfaction
                  of liabilities to creditors as required by the Texas Business
                  Corporation Act, subject to the rights of the holders of any
                  stock of the Corporation ranking senior to the Class B Common
                  Stock in respect of distributions of assets upon liquidation,
                  dissolution, or winding-up of the Corporation but before any
                  distribution of assets is made with respect to any shares of
                  Class A Common Stock, an amount equal to the aggregate of the
                  liquidation preference specified in paragraph 6 of this
                  subsection B.

                           3. Voting Rights. Except as may otherwise be required
                  by law, this Certificate of Incorporation or the provisions of
                  any Preferred Stock Series Resolution, the holders of Class A
                  Common Stock and Class B Common Stock, voting together as a
                  single class, shall have one vote for each share of such stock
                  held by such holder on each matter voted upon by the
                  stockholders.

                           4. Other Rights. Neither class of Common Stock shall
                  be subject to mandatory redemption or to redemption at the
                  option of the Corporation. Except as hereinafter provided,
                  neither class of Common Stock shall have any rights of
                  conversion or exchange. The registered owner of any shares of
                  Class B Common Stock may at any time and from time to time
                  convert any or all such shares into Class A Common Stock on
                  the basis of one share of Class A Common Stock for each share
                  of Class B Common Stock. Such conversion rate shall be subject
                  to equitable adjustment in the event the outstanding shares of
                  Class A Common Stock or Class B Common Stock are changed into
                  a different number of shares or a different class by reason of
                  any stock dividend, subdivision, reclassification,
                  recapitalization, split, combination or exchange of shares. In
                  addition, any shares of Class B Common Stock outstanding on
                  January 1, 2002 shall automatically and without any action on
                  the part of the holder thereof be converted into shares of
                  Class A Common Stock on the basis of one share of Class A
                  Common Stock for each share of Class B Common Stock and
                  thereupon the Common Stock of the Corporation shall consist of
                  a single class consisting of 50,000,000 authorized shares,
                  designated as Common Stock;


<PAGE>   7



                  provided, however, that, if any Exercise Notice (as defined
                  below) shall have been given and be outstanding on January 1,
                  2002, such conversion shall be deferred until such time as
                  the Put transaction contemplated hereby to occur as the
                  result of the giving of such Exercise Notice has been
                  consummated.

                  B.       Additional Rights of Class B Common Stock.

                           1.       Definitions.   The following additional
                  terms have the respective meanings specified below:

                           "Bank Credit Agreement" shall mean that certain Loan
                           Agreement to be dated as of November 18, 1998 among,
                           inter alia, the Corporation, as U.S. Borrower, NATCO
                           Canada, Ltd., as Canadian Borrower, and Chase Bank of
                           Texas, National Association, as U.S. Agent for the
                           lenders thereunder, Bank of Nova Scotia, as Canadian
                           Agent for the lenders thereunder, and such lenders,
                           as amended from time to time.

                           "Business Day" means any day other than a day on
                           which banks in the State of Texas are authorized or
                           obligated to be closed.

                           "Corporate Statute" shall mean the General
                           Corporation Law of the State of Delaware.

                           "Effective Time" shall have the meaning ascribed to
                           such term in paragraph (1) of subsection D of this
                           Section II.

                           "Exercise Notice" shall have the meaning ascribed to
                           such term contained in paragraph 4 of this subsection
                           B.

                           "Holder" shall mean the registered owner of shares of
                           Class B Common Stock as indicated by the stock
                           transfer records for the Class B Common Stock of the
                           Corporation.

                           "Put" shall have the meaning ascribed to such term
                           contained in paragraph 2 of this subsection B.

                           "Put Period" shall have the meaning ascribed to such
                           term contained in paragraph 2 of this subsection B.

                           2. Put. Each Holder of Class B Common Stock shall
                  have the option (the "Put"), commencing on June 30, 2000 and
                  ending on December 31, 2001 (the "Put Period"), of causing the
                  Corporation to purchase from time to time any or all the
                  shares of Class B Common Stock then held by such Holder at a
                  cash purchase price per share of $13.00 per share.


<PAGE>   8


                           3. Applicable Covenant. The rights of each Holder of
                  Class B Common Stock under this Section II are subject to the
                  covenants of the Corporation contained in Section 8.5 of the
                  Bank Credit Agreement.

                           4. Method of Exercise. Any Holder of Class B Common
                  Stock may exercise a Put by giving, during the Put Period,
                  written notice (an "Exercise Notice") to the Corporation
                  specifying in such Exercise Notice the number of shares of
                  Class B Common Stock to be sold to the Corporation, the
                  certificate numbers of the stock certificates that evidence
                  such shares of Class B Common Stock and the aggregate purchase
                  price specified herein to be received by such Holder of Class
                  B Common Stock therefor.

                           5. Consummation. Subject to fulfillment or waiver of
                  the conditions thereto, the closing of such sale shall be
                  effected on the 20th Business Day following receipt of the
                  Exercise Notice by the Corporation. At the closing, the Holder
                  of Class B Common Stock shall deliver to the Corporation one
                  or more stock certificates registered in the name of such
                  Holder and evidencing the number of shares of Class B Common
                  Stock to be sold by the Holder thereof pursuant to the Put,
                  and the Corporation shall deliver to or for the account of
                  such Holder the aggregate purchase price for such shares in
                  immediately available funds.

                           6. Conditions.  The obligation of the Corporation to
                  consummate a transaction pursuant to the exercise of a Put
                  shall be subject to the fulfillment or waiver of the following
                  conditions:

                             (a) Compliance with Corporate Statute. The
                           consummation of the purchase by the Corporation of
                           the shares of Class B Common Stock tendered for
                           purchase by a Holder thereof pursuant to the exercise
                           of a Put shall then comply with the applicable
                           provisions of the Corporate Statute and the Bank
                           Credit Agreement, as amended from time to time.

                             (b) Reporting Company Status. Neither the
                           Corporation nor any issuer of any class or series of
                           security or securities into which the Class B Common
                           shall have been converted or for which the Class B
                           Common Stock shall have been exchanged, in either
                           case pursuant to any merger, consolidation, share
                           exchange, sale of all or substantially all of the
                           Corporation's assets or liquidation or dissolution of
                           the Corporation, shall then be or have previously
                           been subject to the reporting obligations imposed by
                           Section 15(d) or Section 13 of the Securities
                           Exchange Act of 1934, as amended.

                  If a transaction pursuant to the exercise of a Put is not
                  consummated as a result of the nonfulfillment of the condition
                  contained in subparagraph (a) of this paragraph 6, then the
                  obligation of the Corporation to purchase shares of Class B
                  Common Stock pursuant to such Put shall continue in full force
                  and effect, regardless of any expiration of the time periods
                  provided herein for the exercise of any such Put, until


<PAGE>   9


                  the Corporation shall have complied with the terms of the Put
                  so exercised; provided, however, that the price per share of
                  Class B Common Stock of the Corporation payable pursuant to
                  paragraph 2 of this subsection B shall increase by a factor
                  equivalent to interest thereon at a rate per annum equal to
                  the prime rate of interest in effect from time to time at The
                  Chase Manhattan Bank for its most creditworthy corporate
                  customers from the date on which such price would otherwise
                  have been paid in accordance with the other provisions of this
                  subsection B until the date on which actually paid; provided,
                  however, that, commencing on the first anniversary of the
                  related Exercise Notice, such rate shall increase to such
                  prime rate plus 250 basis points. The aggregate amount of the
                  Corporation's obligation to purchase shares of Class B Common
                  Stock pursuant to such Put pending at any given time shall
                  constitute a liquidation preference of the Class B Common
                  Stock. At such time as the condition contained in subparagraph
                  (b) of this paragraph 6 shall occur (regardless of whether a
                  Put shall then have been exercised), the obligation of the
                  Corporation to purchase shares of Class B Common Stock
                  pursuant to any Put shall terminate.

                           7. Representations and Warranties. At the closing of
                  the sale of any shares of Class B Common Stock pursuant to the
                  exercise of a Put, the Holder of such shares of Class B Common
                  Stock shall represent and warrant in writing to the
                  Corporation that: (i) such Holder of Class B Common Stock has
                  full right, power and authority to sell and deliver such
                  shares of Class B Common Stock to the Corporation, (ii) such
                  Holder of Class B Common Stock owns such shares of Class B
                  Common Stock of record and beneficially, free and clear of any
                  liens, encumbrances and adverse claims and (iii), upon
                  delivery thereof to the Corporation pursuant to the exercise
                  of a Put by the Holder of Class B Common Stock, the
                  Corporation will acquire good title to such shares of Class B
                  Common Stock free and clear of any liens, encumbrances and
                  adverse claims (other than any that may have been created by
                  the Corporation).

                           8. Nonassignability. The rights of the Holder of
                  Class B Common Stock pursuant to this subsection B are
                  personal to the Holder of Class B Common Stock and may not be
                  assigned by any Holder of Class B Common Stock other than
                  proportionally in connection with an assignment of such shares
                  of Class B Common Stock by operation of law, by death pursuant
                  to a will or the laws of descent and distribution, by transfer
                  to a member of the immediate family of the Holder of Class B
                  Common Stock or a trust for the benefit of any such family
                  member, by transfer to a commercial bank or other lending
                  institution in accordance with the terms of a bona fide pledge
                  or, in the case of a Holder of Class B Common Stock that is a
                  legal entity at the Effective Time, by such entity to an
                  affiliate (no further assignment being permitted) or successor
                  of such entity or to the purchaser of all or substantially all
                  of that entity's assets, any or all of which exceptions shall
                  be permitted if the transferor or transferee shall give notice
                  of such assignment, together with such information as may be
                  reasonably necessary to evidence qualification of the
                  transferee to be an assignee thereof, to the Corporation. Any
                  assignment or transfer


<PAGE>   10


                  of shares of Class B Common Stock that is not in compliance
                  with the provisions of this paragraph 8 shall cause the
                  relinquishment and termination of the rights contained in
                  this subsection B as they would otherwise apply to such
                  shares of Class B Common Stock.

                  C.       Limited Rights to Class Vote.

                           1. So long as any shares of Class B Common Stock are
                  outstanding, the consent of the holders of not less than a
                  majority of the number of shares of Class B Common Stock then
                  outstanding, given in person or by proxy either at a regular
                  meeting or at a special meeting called for that purpose or
                  pursuant to written consents, at which or pursuant to which,
                  as the case may be, the holders of Class B Common Stock shall
                  vote separately as a class, shall be necessary (i) to approve
                  the issuance by the Corporation of any additional shares of
                  Class B Common Stock and (ii) for effecting, validating or
                  authorizing any amendment, alteration or repeal of any of the
                  provisions of this Section II of Article Fourth of this
                  Certificate of Incorporation, or any amendment thereto, or any
                  other certificate filed pursuant to law (excluding, however,
                  any such amendment, alteration or repeal effected by any
                  merger or consolidation to which the Corporation is a party to
                  the extent provided in paragraph 2 of this subsection C) that
                  would adversely affect any of the designations, preferences,
                  limitations or relative rights of the shares of Class B Common
                  Stock then outstanding; provided, however, that any amendment
                  or amendments to the provisions of the Certificate of
                  Incorporation, as amended, so as to authorize or create, or to
                  increase the authorized amount of, any capital stock of the
                  Corporation ranking pari passu with or senior or junior to the
                  Class B Common Stock as to the payment of dividends or as to
                  the distribution of assets upon any liquidation, dissolution
                  or winding-up of the Corporation shall not be deemed to affect
                  adversely the designations, preferences, limitations or
                  relative rights of the Class B Common Stock.

                           2. The class vote accorded to the Class B Common
                  Stock by paragraph 1 of this subsection B shall not apply to
                  any amendment, alteration or repeal of any of the provisions
                  of this Section II effected by a merger to which the
                  Corporation is a party:

                                    (a) if the Class B Common Stock would in
                           such merger be converted into

                                    (i) a right to receive cash;

                                    (ii) any equity security if that equity
                                    security is registered pursuant to Section
                                    12 of the Securities Exchange Act of 1934,
                                    as amended, or was issued by a corporation
                                    that is then subject to the reporting
                                    obligations imposed by Section 15(d) of the
                                    Securities Exchange Act of 1934, as amended,
                                    as a result of registration of an offering
                                    of that


<PAGE>   11


                                    equity security under the registration
                                    provisions of the Securities Act of 1933,
                                    as amended ("Equity Security");

                                    (iii) any security immediately convertible
                                    into or exchangeable for an Equity Security;

                                    (iv) any option or warrant immediately
                                    exercisable with respect to an Equity
                                    Security; or

                                    (v) any combination of any of the
                                    foregoing; or

                                    (b) if the Class B Common Stock would in
                           such merger be converted, in whole or in part, into
                           any security not contemplated by subparagraph (a) of
                           this paragraph 2 ("Other Security") if the relevant
                           documents provide that the Put shall continue after
                           the effective date of such merger as a right to cause
                           the Corporation or any successor thereto, subject to
                           the other provisions of this Section II, to purchase,
                           at the per share price specified in paragraph 2 of
                           subsection B less the amount of any cash
                           consideration per share of Class B Common Stock paid
                           in the merger, the number of shares or other units of
                           such Other Security into which each share of Class B
                           Common Stock was converted in the merger.

                           3. So long as any shares of the Class B Common Stock
                  remain outstanding, the holders of shares of the Class B
                  Common Stock, voting separately as a class, shall have the
                  right to nominate and to elect, by a majority vote of such
                  shares, one director to the Board of Directors of the
                  Corporation and to fill such position at any regular meeting
                  of stockholders or special meeting called for that purpose or
                  pursuant to written consents. Any director who shall have been
                  elected by holders of shares of Class B Common Stock may be
                  removed at any time, either for or without cause, by, and only
                  by, the affirmative vote of the holders of a majority of the
                  number of shares of Class B Common Stock then outstanding,
                  voting separately as a class, given at any regular meeting of
                  stockholders or a special meeting of such stockholders called
                  for that purpose or pursuant to written consents, and any
                  vacancy thereby created may be filled only by the holders of
                  shares of Class B Common Stock. Such director shall be a
                  member of the Class II Directors. Any director so nominated
                  and elected shall serve until the next annual meeting of
                  stockholders at which members of Class II Directors are
                  elected and until his successor shall have been duly elected
                  or until his earlier resignation, removal or death. The first
                  individual designated by the holders of the Class B Common
                  Stock to serve as a director of the Corporation shall be
                  George K. Hickox, Jr., the term of such director to commence
                  at the effective time of the first issuance of any shares of
                  Class B Common Stock.

                  D.       Exchange of Common Stock for Class A Common Stock.


<PAGE>   12


                           1. Issued Shares. Upon the filing of a Certificate of
                  Amendment reflecting these amendments to the Certificate of
                  Incorporation of the Corporation with the Secretary of State
                  of the State of Delaware (the "Effective Time"), each then
                  issued share of common stock, par value $0.01 per share, of
                  the Corporation (the "Prior Common Stock"), including any such
                  shares held in the treasury of the Corporation, shall be
                  converted, without any action on the part of the holder
                  thereof, into one share of Class A Common Stock.

                           2. Reserved Shares. From and after the Effective
                  Time, each unissued share of the Prior Common Stock reserved
                  for issuance shall be converted, without any action on the
                  part of any Person, into one share of Class A Common Stock and
                  any obligation of the Corporation, whether contractual or
                  otherwise, to issue any shares of the Prior Common Stock shall
                  be deemed to be an obligation to issue an identical number of
                  shares of Class A Common Stock upon the same terms and
                  conditions.


                           3. Certificates. From and after the Effective Time,
                  each holder of a certificate theretofore evidencing shares of
                  the Prior Common Stock may be surrendered by the holder
                  thereof in exchange for a certificate or certificates
                  evidencing an equivalent number of shares of Class A Common
                  Stock.

         II. That in lieu of a special meeting and vote of the stockholders, the
stockholders of the Corporation, by written consent, approved, adopted and
consented to such amendments in accordance with the provisions of Section 228 of
the General Corporation Law of the State of Delaware.

         III. That such amendments were duly adopted in accordance with the
provisions of Sections 242 and 228 of the General Corporation Law of the State
of Delaware.

         The undersigned, being the duly elected and currently acting Senior
Vice President and Chief Financial Officer of NATCO Group Inc., the Corporation
to which reference is made in this Certificate, does make this Certificate as of
the 18th day of November, 1998, and affirms and acknowledges, under penalties of
perjury, that this Certificate is the act and deed of the Corporation and that
the facts stated herein are true.

                              /s/ WILLIAM B. WIENER III
                              -------------------------------------------------
                                       William B.  Wiener III
                                       Senior Vice President and Chief
                                                Financial Officer
                                       NATCO Group Inc.




<PAGE>   1
                                                                     EXHIBIT 4.3

                                                                Cap I and Cap II

                          REGISTRATION RIGHTS AGREEMENT

     REGISTRATION RIGHTS AGREEMENT dated as of November 18, 1998 by and between
NATCO Group Inc., a Delaware corporation (the "Company"), and Capricorn
Investors, L.P., a Delaware limited partnership ("Cap I"), and Capricorn
Investors II, L.P., a Delaware limited partnership ("Cap II").

                                R E C I T A L S:

     On November 18, 1998, the Certificate of Incorporation of the Company was
amended to authorize two classes of common stock, par value $0.01 per share
("Common Stock"), to wit: 45,000,000 shares of Class A Common Stock ("Class A
Common Stock") and 5,000,000 shares of Class B Common Stock ("Class B Common
Stock"), and to convert each of the then outstanding shares of common stock of
the Company into one share of Class A Common Stock (the "Charter Amendments").

     After giving effect to the Charter Amendments, Cap I owns of record and
beneficially 5,563,667 shares (68.3%) of the outstanding Class A Common Stock.

     After giving effect to the Charter Amendments, Cap II owns of record and
beneficially 2,582,259 shares (31.7%) of the outstanding Class A Common Stock.

     Together, Cap I and Cap II own of record and beneficially, as of the date
of this Agreement, all the outstanding Class A Common Stock, being all the
outstanding Common Stock.

     The Company, National Tank Company, a Delaware corporation and a wholly
owned subsidiary of the Company ("Natco"), Natco Acquisition Company, a Delaware
corporation and a wholly owned subsidiary of the Company ("Newco") and The
Cynara Company, a Delaware corporation ("Cynara"), are parties to an Amended and
Restated Agreement and Plan of Merger dated November 17, 1998 but effective as
of March 26, 1998 (the "Merger Agreement"), pursuant to which Cynara will be
merged with and into Natco (the "Merger") and the Designated Stockholders will
receive shares of Class B Common Stock through conversion of the outstanding
shares of Cynara common stock.

     The Company and Cap II have executed and delivered an Investment Agreement
dated November 17, 1998 pursuant to which the Company has agreed to issue and
sell, and Cap II has agreed to purchase, a non-negotiable promissory note
convertible upon the occurrence of the events therein specified into 504,762
shares of Class A Common Stock.

     The stockholders of Cynara have entered into a Registration Rights
Agreement of even date herewith between the Company and such stockholders which
contains terms and provisions substantially similar to those herein (the "Cynara
Registration Rights Agreement").



<PAGE>   2


     NOW, THEREFORE, for and in consideration of the foregoing, the mutual
covenants and agreements contained herein and for other good and valuable
consideration, the receipt and adequacy of which are hereby acknowledged, the
parties hereto agree as follows:

     Section 1. Definitions and Usage.

             A. Definitions. The terms defined in this Section, wherever used in
this Agreement, shall, unless the context otherwise requires, have the
respective meanings hereinafter specified.

     "Affected Stockholders" shall mean each Stockholder all or a portion of
whose shares of Common Stock have been included in a Registration Statement
filed with the Commission pursuant to the provisions of this Agreement.

     "Agreement" shall mean this Registration Rights Agreement.

     "Cap I" shall have the meaning ascribed to such term in the first paragraph
of this Agreement.

     "Cap II" shall have the meaning ascribed to such term in the first
paragraph of this Agreement.

     "Class A Common Stock" shall have the meaning ascribed to such term in the
recitals to this Agreement.

     "Class B Common Stock" shall have the meaning ascribed to such term in the
recitals to this Agreement.

     "Commission" shall mean the United States Securities and Exchange
Commission.

     "Common Stock" shall have the meaning ascribed to such term in the recitals
to this Agreement.

     "Company" shall mean NATCO Group Inc., a Delaware corporation, and any
successor corporation by merger, consolidation or otherwise and any parent
corporation resulting from the merger or consolidation of the Company with or
into a subsidiary of another corporation.

     "Cynara" shall mean The Cynara Corporation, a Delaware corporation.

     "Cynara Registration Rights Agreement" shall have the meaning ascribed to
such term in the recitals to this Agreement.

     "Distribution Public Offering" shall mean a distribution (as such term is
used in the Securities Act and the Securities Act Rules) of Common Stock by Cap
I or Cap II to its general and

                          REGISTRATION RIGHTS AGREEMENT
                                        2

<PAGE>   3


limited partners pursuant to a Registration Statement filed and declared
effective under the Securities Act and the Securities Act Rules.

     "Effective Period" shall mean such period as shall be required under the
provisions of the Securities Act and the Securities Act Rules for delivery of a
prospectus meeting the requirements of Section 10(a) of the Securities Act to
any Person purchasing Common Stock in connection with an Underwritten Public
Offering, a Distribution Public Offering or a Market Public Offering, as the
case may be; provided, however, that such period shall not include any delivery
requirement with respect to the distribution by an underwriter of its unsold
allotment relating to an Underwritten Public Offering.

     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended,
as the same shall be in effect at the date of any determination to be made
hereunder.

     "Exchange Act Rules" shall mean the rules and regulations promulgated by
the Commission under the Exchange Act, as the same shall be in effect at the
date of any determination to be made hereunder.

     "Initial Public Offering" shall mean a public offering of Common Stock by
the Company as a result of which the Company first becomes subject to the
reporting requirements of Section 13 or 15(d) of the Exchange Act.

     "Market Public Offering" shall mean a public offering for cash of shares of
Common Stock into an existing trading market for outstanding shares of Common
Stock at other than a fixed price on or through the facilities of a national
securities exchange or to or through a market maker otherwise than on an
exchange, but in any case pursuant to a Registration Statement filed and
declared effective under the Securities Act and the Securities Act Rules.

     "Merger" shall have the meaning ascribed to such term in the recitals to
this Agreement.

     "Merger Agreement" shall have the meaning ascribed to such term in the
recitals to this Agreement.

     "Notice of Intent to File" shall mean a written notice given by the Company
pursuant to Section 2.D or Section 3.A that the Company is preparing to file a
Primary Distribution Registration Statement or a Secondary Distribution
Registration Statement under the Securities Act relating to an Underwritten
Public Offering of Common Stock.

     "Notice of Registration Request" shall mean a written notice given by the
Company pursuant to Section 2.A to the Stockholder that did not send the
applicable Registration Request or pursuant to Section 2.B to all Stockholders
(other than the Stockholder who sent the applicable Registration Request), in
each case notifying such Stockholders that the applicable Registration Request
has been received by the Company and briefly advising such Stockholders that
they have the right to request

                          REGISTRATION RIGHTS AGREEMENT
                                        3

<PAGE>   4


Registration for the distribution of their holdings of Common Stock, subject to
the terms and provisions of this Agreement.

     "Person" shall mean an individual, a corporation, a partnership, a trust,
an unincorporated organization or a government or any agency or political
subdivision thereof.

     "Primary Distribution" shall mean an Underwritten Public Offering of Common
Stock offered, sold and delivered by the Company.

     "Primary Distribution Registration Statement" shall mean a Registration
Statement filed by the Company and declared effective under the Securities Act
and the Securities Act Rules relating to a Primary Distribution.

     "Public Offering" shall mean either a Distribution Public Offering, a
Market Public Offering or an Underwritten Public Offering

     "Registrable Shares" shall mean shares of Common Stock owned of record by
any Stockholder as to which such Stockholder has requested Registration pursuant
to the provisions of Section 2.A, 2.B, 3.B or 4.A.

     "Registration" shall mean the registration under the registration
provisions of the Securities Act of the offering, sale and delivery of shares of
Common Stock.

     "Registration Expenses" shall mean the expenses associated with the
preparation and filing of any registration statement pursuant to Section 2.C,
3.C or 4.A herein and any sale covered thereby (including the reasonable fees
and expenses of legal counsel to the Affected Stockholders, fees related to blue
sky qualifications and filing fees in respect of the National Association of
Securities Dealers, Inc.), but excluding underwriting discounts or commissions
in respect of shares of Common Stock to be sold by the Affected Stockholders.

     "Registration Request" shall mean a written notice from a Stockholder
requesting that the Company file a Registration Statement with respect to a
Distribution Public Offering pursuant to Section 2.A herein, an Underwritten
Public Offering pursuant to Section 2.B herein or a Public Offering pursuant to
Section 4.A herein, in which the Stockholder advises the Company as to the
number of shares of Common Stock that the Stockholder wishes to include in the
applicable Registration and in which the Stockholder agrees to (i) the specified
method of distribution, (ii), in the case of an Underwritten Public Offering,
the designated managing underwriter and (iii) agrees to provide to the Company
all such information as may be required by the Company pursuant to Section 6
herein.

     "Registration Period" shall mean the period of time from the decision of
the Company to prepare and file a Registration Statement to and including the
effective date of such Registration Statement.

                          REGISTRATION RIGHTS AGREEMENT
                                        4

<PAGE>   5


     "Registration Statement" shall mean a registration statement filed on Form
S-1, S-2 or S-3 (or any successor form) under the registration provisions of the
Securities Act and the Securities Act Rules.

     "Request Period" shall mean a period of ten business days after receipt
pursuant to Section 2.A by the Stockholder that did not send the applicable
Registration Request or after receipt pursuant to Section 2.B by all
Stockholders (other than the Stockholder who sent the applicable Registration
Request) of the Notice of Registration Request.

     "Secondary Distribution" shall mean an Underwritten Public Offering of
Common Stock offered, sold and delivered by shareholders of the Company other
than the Stockholders, but including the holders of Common Stock acquired
pursuant to the Merger and subject to the Cynara Registration Rights Agreement.

     "Secondary Distribution Registration Statement" shall mean a Registration
Statement filed by the Company and declared effective under the Securities Act
and the Securities Act Rules relating to a Secondary Distribution, including a
distribution requested by the shareholders subject to the Cynara Registration
Rights Agreement.

     "Securities Act" shall mean the Securities Act of 1933, as amended, as the
same shall be in effect at the date of any determination to be made hereunder.

     "Securities Act Rules" shall mean the rules and regulations promulgated by
the Commission pursuant to the Securities Act, as the same shall be in effect at
the date of any determination to be made hereunder.

     "Stockholders" shall mean Cap I and Cap II and, upon registration of record
ownership of shares of Common Stock by them, Nathaniel A. Gregory, Winokur and
the general and limited partners of Cap I and Cap II and any assignee of any of
them; provided, however, that, in the case of any such record owner, the
offering, sale and delivery of shares of such Common Stock are not exempt from
the registration provisions of the Securities Act pursuant to Section 4(1)
thereof (without regard to the exemption provided by Rule 144 under the
Securities Act unless paragraph (k) of Rule 144 is applicable thereto); and
provided, further, that, in the case of any assignee other than Nathaniel A.
Gregory, Winokur and such general and limited partners, such assignee has agreed
to be bound by the provisions of this Agreement in accordance with Section 15
herein.

     "Supplemental Registration Request" shall mean a written notice given by
any Stockholder pursuant to the provisions of Section 2.A, 2.B or 3.B herein, in
which the Stockholder advises the Company as to the number of shares of Common
Stock that the Stockholder wishes to include in the applicable Registration and
in which the Stockholder agrees to (i) the specified method of distribution,
(ii), in the case of an Underwritten Public Offering, the designated managing
underwriter and (iii) agrees to provide to the Company all such information as
may be required by the Company pursuant to Section 7 herein.

                          REGISTRATION RIGHTS AGREEMENT
                                        5

<PAGE>   6


     "Underwritten Public Offering" shall mean a firm commitment underwritten
public offering for cash of shares of Common Stock pursuant to a Registration
Statement filed and declared effective under the Securities Act and the
Securities Act Rules.

     "Winokur" shall mean Herbert S. Winokur, Jr. or any legal entity (other
than Cap I or Cap II) of which Mr. Winokur is the predominant beneficial owner.

             B. Rules of Construction. Unless the context otherwise requires, as
used in this Agreement: (a) a term has the meaning ascribed to it; (b) "or" is
not exclusive; (c) "including" means "including without limitation;" (d) words
in the singular include the plural; (e) words in the plural include the
singular; (f) words applicable to one gender shall be construed to apply to each
gender; (g) the terms "hereof," "herein," "hereby," "hereto" and derivative or
similar words refer to this entire Agreement; and (h) the term "Section" shall
refer to the specified Section of this Agreement.

     Section 2. Registration Rights.

     A. Distribution Registration Request. If the Company shall receive a
Registration Request from Cap I or Cap II requesting that the Company file a
Registration Statement relating to a Distribution Public Offering of shares of
Common Stock owned by such Stockholder, the Company shall, if the other
Stockholder (Cap I or Cap II) has not theretofore distributed its holdings of
Common Stock to its partners in complete or partial liquidation, give promptly
(and in any event within ten business days) a Notice of Registration Request to
the Stockholder that did not send the Registration Request of the receipt of the
Registration Request, enclosing a copy of the Registration Request. During the
Request Period, the other Stockholder shall be entitled to give a Supplemental
Registration Request to the Company in which such Stockholder requests that the
Company register pursuant to the Securities Act and the Securities Act Rules the
shares of Common Stock owned by such Stockholder to be distributed in a
Distribution Public Offering.

     B. Registration Request. If the Company shall receive a Registration
Request from a Stockholder requesting that the Company file a Registration
Statement relating to an Underwritten Public Offering of shares of Common Stock
owned by such Stockholder, the Company shall give promptly (and in any event
within ten business days) a Notice of Registration Request to each other
Stockholder of the receipt of the Registration Request, enclosing a copy of the
Registration Request. During the Request Period, the other Stockholders shall be
entitled to give a Supplemental Registration Request to the Company in which any
or all such Stockholders request that the Company register pursuant to the
Securities Act and the Securities Act Rules all or any portion of the shares of
Common Stock owned by such Stockholders to be distributed in an Underwritten
Public Offering.

     C. Required Registration. At the end of the Request Period in the case of a
Registration Request made pursuant to Section 2.A or 2.B herein, the Company
shall, subject to the provisions of Section 2.D herein, prepare as promptly as
practicable and file a Registration Statement with

                          REGISTRATION RIGHTS AGREEMENT
                                        6

<PAGE>   7


respect to the distribution in accordance with the applicable method of
distribution of the Registrable Shares to be included therein and use its best
efforts to cause the Registration Statement to become effective under the
Securities Act in accordance with the Securities Act Rules,.

     D. Suspension of Obligations. The Company's obligations under Section 2.C
and Section 4.A herein to prepare and file a Registration Statement and to seek
its effectiveness shall be subject to the following provisions:

        i.  The Company shall be required to file no more than an aggregate of
     five (5) Registration Statements pursuant to Section 2.A and Section 2.B
     and one (1) Registration Statement pursuant to Section 4.A herein.

        ii. The Company's obligations to prepare, file and seek effectiveness of
     a requested Registration Statement shall be suspended:

            (a) in the case of an Underwritten Public Offering, if the aggregate
        number of Registrable Shares to be included in such requested
        Registration Statement is less than 750,000 shares of the then issued
        and outstanding Common Stock;

            (b) in any case, during the period from the time that it gives a
        Notice of Intent to File to Stockholders that it is preparing to file a
        Primary Distribution Registration Statement until 90 days (or such
        shorter period as to which the managing underwriter of the Primary
        Distribution to which the Primary Distribution Registration Statement
        relates shall consent in writing) have lapsed following the effective
        date of a Primary Distribution Registration Statement under the
        Securities Act; provided, however, that (A) such Notice of Intent to
        File is given prior to the time of receipt by the Company of a
        Registration Request by any Stockholder and (B) that the Company shall
        use its best efforts to cause such Primary Distribution Registration
        Statement to be declared effective as promptly as practicable; and
        provided further that the obligation to file a Registration Statement on
        behalf of any Stockholder shall be reinstated if the Company does not
        file a Primary Distribution Registration Statement within 30 days after
        giving the Notice of Intent to File;

            (c) in any case, during the period from the time that it gives a
        Notice of Intent to File to Stockholders that it is preparing to file a
        Secondary Distribution Registration Statement until 90 days (or such
        shorter period as to which the managing underwriter of a Secondary
        Distribution effected by means of a Secondary Distribution Registration
        Statement shall consent in writing) have lapsed following the effective
        date of the Secondary Distribution Registration Statement under the
        Securities Act; provided, however, that (A) such Notice of Intent to
        File is given prior to time of receipt by the Company of a Registration
        Request by any Stockholder and (B) that the Company shall use its best
        efforts to cause such Secondary Distribution Registration Statement to
        be declared effective as promptly as practicable; and

                          REGISTRATION RIGHTS AGREEMENT
                                        7

<PAGE>   8


        provided further that the obligation to file a Registration Statement on
        behalf of any Stockholder shall be reinstated if the Company does not
        file a Secondary Distribution Registration Statement within 30 days
        after giving the Notice of Intent to File; or

            (d) in any case, if at the time of receipt by the Company of a
        Registration Request the Company has material inside information as to
        which it believes it has a valid business purpose in refraining from
        disclosing publicly for the time being and that current public
        disclosure of such information would have a material adverse effect on
        the Company, for a period commencing with the date of receipt of the
        Registration Request and ending on the earlier of (a) 60 days after such
        receipt of the Registration Request; (b) the public announcement of such
        material inside information; or (c) the date on which the Company gives
        the Stockholder who issued the Registration Request a notice that
        suspension of its obligation is no longer required; provided, however,
        that the same material inside information shall not constitute a basis
        for continuation of this suspension period.

        iii. A Registration Statement filed pursuant to a Registration Request
     made under Section 2.B herein shall first include all Registrable Shares
     requested to be included by any and all Stockholders and, only after such
     inclusion, may include Common Stock being sold for the account of the
     Company or any other security holders. Any Common Stock to be offered on
     behalf of the Company or such other security holders will be included in
     such Registration Statement only to the extent that, in the reasonable
     opinion of the managing underwriter for the Underwritten Public Offering of
     Registrable Shares on behalf of Stockholders, such inclusion will not
     materially adversely affect the distribution of Registrable Shares on
     behalf of such Stockholders.

     E. Underwriter. The selection of an underwriter for an Underwritten Public
Offering of Registrable Shares by Stockholders shall be subject to the approval
of the Company, which shall not be unreasonably withheld.

     F. Withdrawn Registration Statement. For purposes of Section 2.D(i) herein,
if a requested Registration Statement is filed and the Company otherwise
complies with its obligations hereunder, and

        i. the Registration Statement is withdrawn with the consent of the
     Affected Stockholders as a result of a delay in the offering requested by
     the Company, then no requested Registration Statement shall be deemed to
     have been filed; or

        ii. the Affected Stockholders cease to prosecute the Public Offering
     subject thereto actively and in good faith, the Company shall have the
     right to withdraw the Registration Statement without the consent of the
     Affected Stockholders and the requested Registration Statement shall be
     deemed to have been filed.

                          REGISTRATION RIGHTS AGREEMENT
                                        8

<PAGE>   9


     Section 3. Incidental/"Piggy-back" Registration.

     A. Notice of Intent to File. If the Company at any time proposes to file a
Primary Distribution Registration Statement or a Secondary Distribution
Registration Statement under the Securities Act relating to an Underwritten
Public Offering of Common Stock that would permit the inclusion therein of
shares of Common Stock to be distributed in accordance with the method of
distribution contemplated by such Registration Statement, the Company shall give
to each Stockholder a Notice of Intent to File promptly after a determination
has been made by the Company to prepare and file such Registration Statement,
but in any event not less than ten days before the filing with the Commission of
such Registration Statement, which notice shall set forth the intended method of
distribution (including the name of the managing underwriter) of the securities
proposed to be registered. The Notice of Intent to File shall include an offer
to include in such filing, subject to the other provisions of this Agreement,
such amount of Registrable Shares as each Stockholder may request.

     B. Supplemental Registration Request. If any Stockholder wishes to have
Registrable Shares registered pursuant to this Section 3, it shall advise the
Company by giving a Supplemental Registration Request within 20 days after the
date of receipt of the Notice of Intent to File (or such shorter period, but in
any event not less than ten days, as the Company shall specify in its Notice of
Intent to File), setting forth the amount of Registrable Shares for which
Registration is requested.

     C. Registration Obligation. Subject to the provisions of the next sentence,
the Company shall include all Registrable Shares specified in the Supplemental
Registration Requests received by it in accordance with subsection B of this
Section 3. If, however, the managing underwriter of the proposed Primary
Distribution or Secondary Distribution shall advise the Company in writing that,
in the reasonable opinion of such managing underwriter, the inclusion in the
Registration Statement of the aggregate number of shares of Common Stock
requested by the Stockholders to be included in the Primary Distribution or
Secondary Distribution would materially adversely affect such distribution of
securities, then the Company shall so advise the Affected Stockholders and the
number of such shares of Common Stock included in the Registration Statement
shall be reduced to the number acceptable to such managing underwriter and such
reduced number of shares shall be allocated pro rata among the Affected
Stockholders based on the Registrable Shares held by each. If any Stockholder
does not agree to the terms of underwriting of such Primary Distribution or
Secondary Distribution, the shares of Common Stock owned by such Stockholder
shall be excluded therefrom by written notice from the Company or such managing
underwriter.

     D. Underwriting Agreement. Any obligation of the Company to include shares
of Common Stock of any Stockholder in a Registration Statement prepared and
filed pursuant to this Section 3 shall be conditioned upon the agreement of such
Stockholder to enter into an underwriting agreement with the Company, other
security holders, if any, and the managing underwriter of the Primary
Distribution or the Secondary Distribution of the type described in subsection
(H) of Section 5.

                          REGISTRATION RIGHTS AGREEMENT
                                        9

<PAGE>   10


     Section 4. Special Registration Right.

     A. Preparation and Filing. If at any time during the term hereof, (i)
Winokur acquires the record and beneficial ownership of any Common Stock from
Cap I or Cap II, (ii) in the opinion of counsel, reasonably satisfactory to the
Company, all or part of such shares may not be sold by Winokur without
registration under the Securities Act or reliance on an exemption from the
registration provisions thereof (other than Section 4(1) of the Securities Act)
and (iii) Winokur desires in good faith to pledge all or a portion of such
shares as collateral for borrowings by Winoker from one or more lenders
("Lenders"), then, upon receipt by the Company of a Registration Request from
Winokur or the Lenders, the Company shall, subject to the provisions of Section
2.D herein, prepare as promptly as practicable and file a Registration Statement
with respect to the offering, sale and delivery by the Lenders of all or any
part of the shares of Common Stock pledged by Winokur to the Lenders in
accordance with the applicable method of distribution of the Registrable Shares
to be included therein and use its best efforts to cause the Registration
Statement to become effective under the Securities Act in accordance with the
Securities Act Rules. If so requested by Winokur or the Lenders, the
Registration Statement shall be filed pursuant to Rule 415 (relating to "shelf
registration statements") of the Securities Act Rules.

     B. Distribution. The applicable method of distribution of the Registrable
Shares shall be as requested by the Lenders (or Winokur on behalf of the
Lenders) and the methods of distribution may include a distribution by one or
more broker-dealers named in the Registration Statement "at the market" pursuant
to a Market Public Offering. The Company agrees that it will amend the
Registration Statement or supplement the prospectus to include any material
information with respect to the plan of distribution not previously disclosed in
the Registration Statement or any material change to such information in the
Registration Statement.

     C. Limitations. The preparation and filing of a Registration Statement
pursuant to this Section 4 and the offering, sale and delivery of Registrable
Shares pursuant thereto shall be subject to the following limitations:

        i. The Company shall be obligated to prepare, file and cause to become
     effective only one Registration Statement pursuant to this Section 4.

        ii. The only offering, sale and delivery of Registrable Shares under
     such Registration Statement shall be for the account of the Lenders after a
     foreclosure of the lien against such shares following a default in payment
     of the borrowings made against such collateral, and no sales of such shares
     shall be effected by the Lenders under such Registration Statement prior to
     the delivery to the Company of a certificate of the Lenders to such effect.

        iii. The proposed and actual filing by the Company of a Registration
     Statement pursuant to this Section 4 shall not entitle any Stockholder to
     registration rights pursuant to Section 3 herein.

                          REGISTRATION RIGHTS AGREEMENT
                                       10

<PAGE>   11


        iv. The offering, sale and delivery of Registrable Shares pursuant to
     any Registration Statement filed pursuant to Rule 415 (relating to "shelf
     registration statements") of the Securities Act Rules under this Section 4
     shall be suspended if, at the time of any offering, sale and delivery
     pursuant to a shelf registration statement, the Company has material inside
     information as to which it believes it has a valid business purpose in
     refraining from disclosing publicly for the time being and that current
     public disclosure of such information would have a material adverse effect
     on the Company. Such suspension period shall commence upon notice by the
     Company to Winokur and the Lenders and shall continue until the earlier of
     (a) the expiration of 60 days thereafter; (b) the public announcement of
     such material inside information; or (c) the date on which the Company
     gives Winokur and the Lenders notice that such suspension is no longer
     required; provided, however, that the same material inside information
     shall not constitute a basis for continuation of this suspension period.

        v. The Company shall be obligated to maintain the effectiveness of a
     Registration Statement filed pursuant to Rule 415 (relating to "shelf
     registration statements") of the Securities Act Rules under this Section 4
     until the third anniversary of the effective date thereof and no longer.

     D. Benefits. Upon receipt by the Company of a Registration Request under
this Section 4, the Lenders shall have the benefits and obligations of an
Affected Stockholder under Sections 5, 6, 7 and 8 of this Agreement and of a
Stockholder under Sections 9, 10, 11, 12, 13, 16 and 17 of this Agreement.

     Section 5. Registration Procedures. If the Company is required by the
provisions of Section 2, 3 or 4 to effect the Registration of any of the
Registrable Shares, the Company shall, as expeditiously as possible:

     A. Filing. Prepare and file with the Commission a Registration Statement
with respect to such shares of Common Stock and use its best efforts to cause
such Registration Statement to become and, subject to subsection C of this
Section 5, remain effective.

     B. Amendments. Prepare and file with the Commission during the Registration
Period such amendments and supplements to such Registration Statement and the
prospectus used in connection therewith as may be necessary to permit such
Registration Statement to become effective in accordance with the Securities Act
and the Securities Act Rules and to ensure that such Registration Statement and
the prospectus used in connection therewith comply with the disclosure standards
of Section 11 of the Securities Act and Section 10(b) of the Exchange Act and
that such prospectus complies with Section 10 of the Securities Act, in each
case during the Effective Period.

     C. Maintenance of Effectiveness. Subject to the provisions of Section 4.C
herein, use its best efforts to maintain the effectiveness of such Registration
Statement and to ensure compliance of the prospectus contained therein with
Section 10(a) of the Securities Act for the Effective Period.

                          REGISTRATION RIGHTS AGREEMENT
                                       11

<PAGE>   12
     D. Copies. Furnish to each Affected Stockholder (i) such number of copies
of such Registration Statement and of each amendment and supplement thereto (in
each case including all exhibits), such number of copies of the prospectus
included in such Registration Statement (including each preliminary prospectus,
summary prospectus and prospectus supplement), in conformity with the
requirements of the Securities Act, and such other documents, as such Affected
Stockholder may reasonably require in order to facilitate the offering, sale and
delivery or other disposition of the Registrable Shares owned by such Affected
Stockholder and (ii), during the Registration Period and the Effective Period,
copies of any written correspondence or memoranda relating to oral
communications in each case with the Commission and copies of any request by the
Commission for any amendment of or supplement to the Registration Statement or
the prospectus included therein or for additional information.

     E. Blue Sky Laws. Use its best efforts to register or qualify the Common
Stock covered by such Registration Statement under the securities or blue sky
laws of such jurisdictions as the managing underwriter of such Distribution may
reasonably request (excluding, however, any jurisdiction in which the filing
would subject the Company to additional tax liability and any jurisdiction in
which the Company would thereby be required to execute a general consent to
service of process) and use all reasonable efforts to do such other acts and
things as may be required to enable the Affected Stockholders to consummate the
public sale or other disposition in such jurisdictions of the Registrable Shares
owned by such Affected Stockholders.

     F. Earnings Statement. Make available to its holders of Common Stock, as
soon as reasonably practicable, an earnings statement covering the period of at
least 12 months, but not more than 18 months, beginning with the first month
after the effective date of the Registration Statement, which earnings statement
shall satisfy the provisions of Section 11(a) of the Securities Act.

     G. Amended Prospectuses. Notify each Affected Stockholder immediately if
the Company shall become aware at any time during the Effective Period that the
prospectus included in the Registration Statement, as such prospectus may be
amended or supplemented, includes an untrue statement of a material fact or
omits to state any material fact required to be stated therein or necessary in
order to make the statements therein not misleading in light of the
circumstances then existing, and at the request of any Affected Stockholder to
prepare promptly and to furnish to each Affected Stockholder such number of
copies of an amended or supplemental prospectus as may be necessary so that, as
thereafter delivered to the purchasers of such Registrable Shares, such
prospectus shall not include an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary in order to
make the statements therein not misleading in the light of the circumstances
then existing.

     H. Underwriting Agreements. Enter into such agreements (including an
underwriting agreement in customary form and containing customary provisions
relating to legal opinions and accountants' letters, representations and
warranties and mutual indemnification and contribution between the Company and
the underwriters for the Affected Stockholders) and use all reasonable

                          REGISTRATION RIGHTS AGREEMENT
                                       12

<PAGE>   13


efforts to take such other actions as the Affected Stockholders may reasonably
request in order to expedite or facilitate the disposition of such Registrable
Shares.

     I. Inspection. Make available for inspection by the Affected Stockholders,
by any underwriter participating in any distribution to be effected pursuant to
such Registration Statement and by any attorney, accountant or other agent
retained by Affected Stockholders or any such underwriter all pertinent
financial and other records, pertinent corporate documents and properties of the
Company and cause all of the Company's officers, directors and employees to
supply all such information requested by the Affected Stockholders, such
underwriter, attorney, accountant or agent, as is reasonably needed in
connection with such Registration.

     6. Classes of Stock. The parties hereto intend that any capital stock sold
by a Stockholder pursuant to the provisions of this Agreement shall be Class A
Common Stock if sold prior to January 1, 2002 or Common Stock if sold
thereafter. Accordingly, any reference herein to the inclusion of Common Stock
in a Registration Statement for offering, sale and delivery by a Stockholder
hereunder shall, subject to the proviso to Article Fourth, II-A-4, of the
Certificate of Incorporation of the Company, prior to January 1, 2002 be deemed
to refer to Class A Common Stock and thereafter to Common Stock.

     7. Expenses; Limitations on Registration. The Registration Expenses
relating to any Registration effected by the Company pursuant to this Agreement
shall be for the account of the Company; provided, however, that any and all
underwriting discounts and commissions attributable to the sale of the shares of
Common Stock of the Affected Stockholders shall be for the account of the
Affected Stockholders.

     For purposes of this Section 7, the Company shall be obligated to pay the
fees and expenses of only one law firm representing the Affected Stockholders.
If more than one such firm shall represent the Affected Stockholders in
connection with a Registration under this Agreement, the Affected Stockholders
shall notify the Company as to which firm shall be deemed to represent the
Affected Stockholders for purposes of this Section 7.

     Section 8. Stockholders' Information. The Affected Stockholders shall
provide all information reasonably requested by the Company for inclusion in any
Registration Statement to be filed hereunder. The actual provision of such
information shall be a condition precedent to the obligation of the Company to
take any action pursuant to this Agreement in respect of the Registration of
Registrable Shares of any Affected Stockholder.

     Section 9. Indemnification.

     A. In connection with the Registration of any Registrable Shares under the
Securities Act pursuant to this Agreement, the Company agrees to indemnify and
hold harmless each Affected Stockholder, its partners, directors, officers and
employees, and each other Person, if any, who controls such Affected Stockholder
within the meaning of Section 15 of the Securities Act, against

                          REGISTRATION RIGHTS AGREEMENT
                                       13

<PAGE>   14


any losses, claims, damages or liabilities, joint or several, to which such
Affected Stockholder or any such partner, director, officer, employee or
controlling Person may become subject under the Securities Act or any other
statute or at common law, insofar as such losses, claims, damages or liabilities
(or actions in respect thereof) arise out of or are based upon (i) any untrue
statement or any alleged untrue statement of a material fact contained in the
Registration Statement or the prospectus included therein at the time the
Registration Statement is declared effective or any omission or alleged omission
of a material fact required to be stated therein or necessary in order to make
the statements therein not misleading or (ii) any untrue statement of a material
fact or alleged untrue statement of a material fact contained in the
Registration Statement, any preliminary prospectus, the prospectus included
therein or any amendment or supplement thereto or any omission or alleged
omission of a material fact required to be stated therein or necessary in order
to make the statements concerning the Company therein, in the light of the
circumstances under which they were made, not misleading and shall reimburse
each Affected Stockholder and each such partner, director, officer, employee and
controlling Person for any legal or other expenses reasonably incurred by such
Affected Stockholder or such partner, director, officer employee or controlling
Person in connection with investigating or defending any such loss, claim,
damage, liability or action; provided, however, that the Company shall not be
liable in any such case to the extent that any such loss, claim, damage or
liability arises out of or is based upon any untrue statement or alleged untrue
statement or omission or alleged omission made in such Registration Statement,
preliminary prospectus, prospectus, or amendment or supplement in reliance upon
and in conformity with written information furnished by or on behalf of an
Affected Stockholder to the Company expressly for use therein; and provided,
further, that the Company shall not be liable in any such case to the extent
that any such loss, claim, damage, liability or expense arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission in any preliminary prospectus if such untrue statement or
alleged untrue statement or omission or alleged omission was corrected in the
final prospectus included in the Registration Statement at the time it became
effective and the Affected Stockholder, in the case of a Distribution Public
Offering or a Market Public Offering, or the managing underwriter, in the case
of an Underwritten Public Offering, failed to provide the final prospectus as
required by the Securities Act and the Securities Act Rules. Such indemnity
shall remain in full force and effect regardless of any investigation made by or
on behalf of any Affected Stockholder or any such partner, director, officer,
employee or controlling Person, and shall survive the transfer of such
securities by any Affected Stockholder.

     B. Each Affected Stockholder agrees to indemnify and hold harmless the
Company, its directors, officers and employees, each other Person, if any, who
controls the Company and each other Affected Stockholder against any losses,
claims, damages or liabilities, joint or several, to which the Company, any such
director, officer or employee, any such controlling Person or such other
Affected Stockholder may become subject under the Securities Act or any other
statute or at common law, insofar as such losses, claims, damages or liabilities
(or actions in respect thereof) arise out of or are based upon (i) any untrue
statement or any alleged untrue statement of a material fact contained in the
Registration Statement or the prospectus included therein at the time the
Registration Statement is declared effective or any omission or alleged omission
of a material fact required to be stated therein or necessary in order to make
the statements therein not misleading or

                          REGISTRATION RIGHTS AGREEMENT
                                       14

<PAGE>   15


(ii) any untrue statement of a material fact or alleged untrue statement of a
material fact contained in the Registration Statement, any preliminary
prospectus, the prospectus included therein or any amendment or supplement
thereto or any omission or alleged omission of a material fact required to be
stated therein or necessary in order to make the statements concerning the
Company therein, in the light of the circumstances under which they were made,
not misleading, in each case to the extent, but only to the extent, that such
alleged untrue statement or alleged omission was made in such Registration
Statement, preliminary prospectus, prospectus, amendment or supplement in
reliance upon and in conformity with written information furnished by or on
behalf of an Affected Stockholder to the Company expressly for use therein, and
shall reimburse the Company or such director, officer, employee or other Person
for any legal or any other expenses reasonably incurred in connection with
investigating or defending any such loss, claim, damage, liability or action.

     C. Promptly after receipt by an indemnified party hereunder of written
notice of the commencement of any action or proceeding involving a claim
referred to in subsection (A) or (B) of this Section 9, such indemnified party
will, if a claim in respect thereof is to be made against an indemnifying party,
give written notice to the latter of the commencement of such action; provided,
that the failure of any indemnified party to give notice as provided herein
shall not relieve the indemnifying party of its obligation under this subsection
C to the extent the indemnifying party is not materially prejudiced by such
failure. In case any such action is brought against an indemnified party, the
indemnified party shall permit the indemnifying party to assume the defense of
such action or proceeding, provided that counsel for the indemnifying party, who
shall conduct the defense of such action or proceeding, shall be approved by the
indemnified party (whose approval shall not be unreasonably withheld) and the
indemnified party may participate in such defense (in which case, such
participation shall be at such indemnified party's expense, unless in such
indemnified party's reasonable judgment a conflict of interest between such
indemnified party and the indemnifying party shall exist in respect of such
claim, in which event the indemnifying party shall pay the reasonable fees and
expense of separate counsel for the indemnified party). No indemnifying party
shall consent to entry of any judgment or enter into any settlement that does
not include as an unconditional term thereof the giving by the claimant or
plaintiff to such indemnified party of a release from all liability in respect
to such claim or litigation. The indemnifying party shall not, in connection
with any proceeding or related proceedings in the same jurisdiction, be liable
for the fees and expenses of more than one separate firm for all indemnified
parties. The indemnifying party shall not be liable for any settlement of any
proceeding effected without its written consent.

     D. Indemnification similar to that specified in the preceding subsections
of this Section 9 shall be given by the Company and each Affected Stockholder
(with such modifications as shall be appropriate) with respect to liability
related to any required registration or other qualification of Registrable
Shares under any Federal or state law or regulation of governmental authority
other than the Securities Act.

     E. If the indemnification provided for in this Section 9 is unavailable or
insufficient to hold harmless an indemnified party under subsection (A) or (B)
above, then the indemnifying party shall contribute to the amount paid or
payable by such indemnified party as a result of the losses, claims,

                          REGISTRATION RIGHTS AGREEMENT
                                       15

<PAGE>   16


damages or liabilities referred to in subsection (A) or (B) above, in such
proportion as is appropriate to reflect the relative fault of the Company, on
the one hand, and each Affected Stockholder, on the other, in connection with
the statements or omissions that resulted in such losses, claims, damages or
liabilities, as well as any other relevant equitable considerations. The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by the
Company or such Affected Stockholder and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
untrue statement or omission. The Company and the Affected Stockholders agree
that it would not be just and equitable if contributions pursuant to this
subsection (E) were to be determined by pro rata allocation or by any other
method of allocation that does not take account of the equitable considerations
referred to in the first sentence of this subsection (E). The amount paid by an
indemnified party as a result of the losses, claims, damages or liabilities
referred to in the first sentence of this subsection (E) shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified
party in connection with investigating or defending any action or claim (which
shall be limited as provided in subsection (C) above if the indemnifying party
has assumed the defense of any such action in accordance with the provisions
thereof) that is the subject of this subsection (E). Notwithstanding the
provisions of this subsection (E), in respect of any loss, claim, damage or
liability based upon any untrue or alleged untrue statement of a material fact
or omission or alleged omission to state a material fact that relates to
information other than information supplied by any Affected Stockholder, no
Affected Stockholder shall be required to contribute any amount in excess of the
amount by which the total price at which the Registrable Shares offered by it
and distributed to the public exceeds the amount of any damages that such
Affected Stockholder has otherwise been required to pay by reason of such untrue
or alleged untrue statement or omission or alleged omission. No Person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the Act)
shall be entitled to contribution from any Person who was not guilty of such
fraudulent misrepresentation. Promptly after receipt by an indemnified party
under this subsection (E) of notice of the commencement of any action against
such party in respect of which a claim for contribution may be made against an
indemnifying party under this subsection (E), such indemnified party shall
notify the indemnifying party in writing of the commencement thereof if the
notice specified in subsection (C) above has not been given with respect to such
action; but the omission so to notify the indemnifying party shall not relieve
it from any liability which it may have to any indemnified party under this
subsection (E) to the extent such omission is not prejudicial.

     Section 10. Public Availability of Information. The Company shall comply
with all applicable public information reporting requirements of the Commission,
to the extent required from time to time to enable each Stockholder to sell
Registrable Shares without Registration under the Securities Act within the
limitation of the exemptions provided by (i) Rule 144 under the Securities Act,
as such Rule may be amended from time to time, or (ii) any similar rule or
regulation hereafter adopted by the Commission. Upon the request of any
Stockholder, the Company will deliver to such Stockholder a written statement as
to whether it has complied with such requirements.

                          REGISTRATION RIGHTS AGREEMENT
                                       16

<PAGE>   17


     Section 11. Supplying Information. The Company shall cooperate with each
Stockholder in supplying such information as may be necessary for such
Stockholder to complete and file any information reporting forms presently or
hereafter required by the Commission as a condition to the availability of an
exemption from the Securities Act for the sale of any Registrable Shares.

     Section 12. Specific Performance. Each party hereto acknowledges and agrees
that each other party hereto would be irreparably harmed and would have no
adequate remedy of law if any of the provisions of this Agreement were not
performed in accordance with their specific terms or were otherwise breached.
Accordingly, it is agreed that, in addition to any other remedies by law or in
equity which may be available, the parties hereto shall be entitled to obtain
preliminary and permanent injunctive relief with respect to any breach or
threatened breach of, or otherwise obtain specific performance of, the covenants
and other agreements contained in this Agreement.

     Section 13. Representations and Warranties of the Company. The Company
represents and warrants to each Stockholder that, as of the date of this
Agreement, (a) the Company is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware and has the corporate
power and authority to enter into this Agreement and to carry out its
obligations hereunder, (b) the execution and delivery of this Agreement by the
Company and the consummation by the Company of the transactions contemplated
hereby have been duly authorized by all necessary corporate action on the part
of the Company and no other corporate proceedings on the part of the Company are
necessary to authorize this Agreement or any of the transactions contemplated
hereby and (c) this Agreement has been duly executed and delivered by the
Company and constitutes a valid and binding obligation of the Company, and,
assuming that this Agreement constitutes a valid and binding obligation of each
of Cap I and Cap II, is enforceable against the Company in accordance with its
terms, subject to applicable bankruptcy, reorganization, insolvency, moratorium,
fraudulent conveyance and similar laws affecting creditors' rights generally
from time to time and to general principles of equity and except as the
enforceability thereof may be limited by considerations of public policy.

     Section 14. Representations and Warranties of Cap I and Cap II. Each of Cap
I and Cap II represents and warrants to the Company that, as of the date of this
Agreement, (a) it is a limited partnership duly organized, validly existing and
in good standing under the laws of the State of Delaware and has the
organizational power and authority to enter into this Agreement and to carry out
its obligations hereunder, (b) the execution and delivery of this Agreement by
such Stockholder and the consummation by such Stockholder of the transactions
contemplated hereby have been duly authorized by all necessary organizational
action on the part of such Stockholder and no other organizational proceedings
on the part of such Stockholder are necessary to authorize this Agreement or any
of the transactions contemplated hereby and (c) this Agreement has been duly
executed and delivered by such Stockholder and constitutes a valid and binding
obligation of such Stockholder and, assuming that this Agreement constitutes a
valid and binding obligation of the Company, is enforceable against such
Stockholder in accordance with its terms, subject to applicable bankruptcy,
reorganization, insolvency, moratorium, fraudulent conveyance and similar laws
affecting creditors'

                          REGISTRATION RIGHTS AGREEMENT
                                       17

<PAGE>   18


rights generally from time to time and to general principles of equity and
except as the enforceability thereof may be limited by considerations of public
policy.

     Section 15. Expiration. This Agreement and the rights, benefits, duties and
obligations hereunder of the parties hereto and their successors and permitted
assigns shall expire and be of no further force or effect on the 180th day after
the later to occur of (i) May 31, 2004 and (ii) the first date on which each and
all of Cap I, Cap II, Nathaniel A. Gregory and, to the extent that Winokur has
acquired the record and beneficial ownership of shares of Common Stock from Cap
I or Cap II, Winokur is able to sell shares of Common Stock subject hereto in
reliance upon the exemption from the registration provisions of the Securities
Act contained in Rule 144(k) or any successor Securities Act Rule.

     Section 16. Notices. All notices and other communications hereunder shall
be in writing and shall be deemed given if delivered personally or transmitted
by telex, telegram or facsimile transmission or mailed by registered or
certified mail (return receipt requested) to the parties at the following
addresses (or at such other address for a party as shall be specified by like
notice):

     (a)      if to Cap I, to:
              Capricorn Investors, L.P.
              c/o Winokur Holdings, Inc.
              30 East Elm Street
              Greenwich, Connecticut  06830
              Attention:  Herbert S.  Winokur, Jr.
                          President
              Telecopy No.:  (203) 861-6671

              with a copy to:
              O'Melveny & Myers LLP
              153 E. 53rd Street
              53rd Floor
              New York, New York 10022-4611
              Attn.:  Mr. Jeffrey J.  Rosen
              Facsimile: (212) 326-2061

     (b)      if to Cap II, to:
              Capricorn Investors II, L.P.
              c/o Capricorn Holdings, LLC
              30 East Elm Street
              Greenwich, Connecticut  06830
              Attention:  Manager
              Telecopy No.:  (203) 861-6671

                          REGISTRATION RIGHTS AGREEMENT
                                       18

<PAGE>   19




              with a copy to:
              O'Melveny & Myers LLP
              153 E. 53rd Street
              53rd Floor
              New York, New York 10022-4611
              Attn.:  Mr. Jeffrey J.  Rosen
              Facsimile:  (212) 326-2061

     (c)      if to the Company, to:
              NATCO Group, Inc.
              Brookhollow Central III
              2950 North Loop West
              Suite 750
              Houston, Texas 77092
              Attn.:  Mr. Nathaniel A. Gregory, Chairman and Chief
                      Executive Officer
              Facsimile No.:  (713) 683-7814

              with a copy to:
              Vinson & Elkins L.L.P.
              First City Tower
              1001 Fannin Street
              Houston, Texas 77002-6760
              Attn.:  Mr. William E. Joor III
              Facsimile No.:  (713) 615-5201

     Section 17. Benefit and Assignment.

             (a) The terms and conditions of this Agreement shall inure to the
     benefit of and be binding on the parties hereto and their respective
     successors and permitted assigns; provided, however, that, except as
     otherwise provided in this Section, this Agreement shall not be assignable
     by any party hereto except by operation of law or with the prior express
     written consent of the other parties hereto. Upon registration of record
     ownership of shares of Common Stock by Nathaniel A. Gregory, Winokur or any
     general or limited partner of Cap I or Cap II, such person shall become a
     Stockholder and a third party beneficiary of all the rights of a
     Stockholder hereunder. Nothing in this Agreement, express or implied, is
     intended to confer upon any party, other than the parties hereto, their
     respective successors and permitted assigns and such third party
     beneficiaries, any rights, remedies, obligations or liabilities under or by
     reason of this Agreement.

             (b) If Cap I or Cap II shall transfer and assign shares of Common
     Stock to any Person otherwise than in a Distribution Public Offering or an
     Underwritten Public Offering, Cap I or Cap II (or any Person who shall be a
     transferee or assignee pursuant to this subsection (b)), as the case may
     be, may assign such portion of its rights and benefits under

                          REGISTRATION RIGHTS AGREEMENT
                                       19

<PAGE>   20


     this Agreement as is necessary to permit such Person to act as a
     Stockholder hereunder; provided, however, that such Person shall agree in
     writing to be bound by the duties and obligations of a Stockholder
     hereunder.

     Section 18. Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without regard to
the application of doctrines of conflicts of law.

     Section 19. Counterparts. This Agreement may be executed simultaneously in
one or more counterparts, any of which may have been transmitted and received by
facsimile transmission and each of which shall be deemed to be an original but
all of which together shall constitute one and the same instrument.

             (The remainder of this page left blank intentionally.)







                          REGISTRATION RIGHTS AGREEMENT
                                       20

<PAGE>   21


     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed by their officers thereunto duly authorized.

                                       NATCO GROUP INC.



                                       BY: /s/ NATHANIEL A. GREGORY
                                           -------------------------------------
                                           Nathaniel A. Gregory
                                           Chairman and Chief Executive Officer

                                       CAPRICORN INVESTORS, L.P.

                                       By: Capricorn Holdings, G.P.,
                                           its general partner

                                       By: Winokur Holdings, Inc.,
                                           its general partner

                                       By: /s/ HERBERT S. WINOKUR, JR.
                                           -------------------------------------
                                           Herbert S. Winokur, Jr.
                                           President.

                                       CAPRICORN INVESTORS II, L.P.

                                       By: Capricorn Holdings, LLC,
                                           its general partner

                                       By: /s/ HERBERT S. WINOKUR, JR.
                                           -------------------------------------
                                           Herbert S. Winokur, Jr.
                                           Manager

                         REGISTRATION RIGHTS AGREEMENT
                                       21

<PAGE>   1
                                                                    EXHIBIT 4.4


                                                                         Cynara

                         REGISTRATION RIGHTS AGREEMENT

         REGISTRATION RIGHTS AGREEMENT dated as of November 18, 1998 by and
between NATCO Group Inc., a Delaware corporation (the "Company"), and the
undersigned holders of Common Stock of the Company (the "Designated
Stockholders").

                                R E C I T A L S:

         On November 18, 1998, the Certificate of Incorporation of the Company
was amended to authorize two classes of common stock, par value $0.01 per share
("Common Stock"), to wit: 45,000,000 shares of Class A Common Stock ("Class A
Common Stock") and 5,000,000 shares of Class B Common Stock ("Class B Common
Stock"), and to convert each of the then outstanding shares of common stock of
the Company into one share of Class A Common Stock (the "Charter Amendments").

         After giving effect to the Charter Amendments, Cap I owns of record
and beneficially 5,563,667 shares (68.3%) of the outstanding Class A Common
Stock.

         After giving effect to the Charter Amendments, Cap II owns of record
and beneficially 2,582,259 shares (31.7%) of the outstanding Class A Common
Stock.

         Together, Cap I and Cap II own of record and beneficially, as of the
date of this Agreement, all the outstanding Class A Common Stock, being all the
outstanding Common Stock.

         The Company, National Tank Company, a Delaware corporation and a
wholly owned subsidiary of the Company ("Natco"), Natco Acquisition Company, a
Delaware corporation and a wholly owned subsidiary of the Company ("Newco") and
The Cynara Company, a Delaware corporation ("Cynara"), are parties to an
Amended and Restated Agreement and Plan of Merger dated November 17 1998 but
effective as of March 26, 1998 (the "Merger Agreement"), pursuant to which
Cynara will be merged with and into Natco (the "Merger") and the Designated
Stockholders will receive shares of Class B Common Stock through conversion of
the outstanding shares of Cynara common stock.

         The Company and Cap II have executed and delivered an Investment
Agreement dated November 17, 1998 pursuant to which the Company has agreed to
issue and sell, and Cap II has agreed to purchase, a non-negotiable promissory
note convertible upon occurrence of the events therein specified into 504,762
shares of Class A Common Stock.

         Cap I and Cap II have entered into a Registration Rights Agreement of
even date herewith between the Company and such stockholders which contains
terms and provisions substantially similar to those herein (the "Capricorn
Registration Rights Agreement").



<PAGE>   2



         It is a condition to consummation of the Merger that the stockholders
of Cynara who will become stockholders of the Company upon consummation of the
Merger shall have entered into a registration rights agreement as contemplated
by the Merger Agreement.

         NOW, THEREFORE, for and in consideration of the foregoing, the mutual
covenants and agreements contained herein and for other good and valuable
consideration, the receipt and adequacy of which are hereby acknowledged, the
parties hereto agree as follows:

         Section 1.        Definitions and Usage.

                  A. Definitions. The terms defined in this Section, wherever
used in this Agreement, shall, unless the context otherwise requires, have the
respective meanings hereinafter specified.

         "Affected Stockholders" shall mean each Stockholder all or a portion
of whose shares of Common Stock have been included in a Registration Statement
filed with the Commission pursuant to the provisions of this Agreement.

         "Agreement" shall mean this Registration Rights Agreement.

         "Cap I" shall mean Capricorn Partners, L.P., a Delaware limited
partnership.

         "Cap II" shall mean Capricorn Partners II, L.P., a Delaware limited
partnership.

         "Capricorn Registration Rights Agreement" shall have the meaning
ascribed to such term in the recitals to this Agreement.

         "Class A Common Stock" shall have the meaning ascribed to such term in
the recitals to this Agreement.

         "Class B Common Stock" shall have the meaning ascribed to such term in
the recitals to this Agreement.

         "Commission" shall mean the United States Securities and Exchange
Commission.

         "Common Stock" shall have the meaning ascribed to such term in the
recitals to this Agreement.

         "Company" shall mean NATCO Group Inc., a Delaware corporation, and any
successor corporation by merger, consolidation or otherwise and any parent
corporation resulting from the merger or consolidation of the Company with or
into a subsidiary of another corporation.

         "Cynara" shall mean The Cynara Corporation, a Delaware corporation.


                         REGISTRATION RIGHTS AGREEMENT
                                       2

<PAGE>   3



         "Designated Stockholders" shall have the meaning ascribed to such term
in the first paragraph of this Agreement.

         "Earnout Shares" shall mean the CTOC Earnout Shares, the Initial
Earnout Shares and the Supplemental Earnout Shares as those terms are defined
in the Merger Agreement.

         "Effective Period" shall mean such period as shall be required under
the provisions of the Securities Act and the Securities Act Rules for delivery
of a prospectus meeting the requirements of Section 10(a) of the Securities Act
to any Person purchasing Common Stock in connection with an Underwritten Public
Offering or a Market Public Offering; provided, however, that such period shall
not include any delivery requirement with respect to the distribution by an
underwriter of its unsold allotment relating to an Underwritten Public
Offering.

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, as the same shall be in effect at the date of any determination to be
made hereunder.

         "Exchange Act Rules" shall mean the rules and regulations promulgated
by the Commission under the Exchange Act, as the same shall be in effect at the
date of any determination to be made hereunder.

         "Market Public Offering" shall mean a public offering for cash of
shares of Common Stock into an existing trading market for outstanding shares
of Common Stock at other than a fixed price on or through the facilities of a
national securities exchange or to or through a market maker otherwise than on
an exchange, but in any case pursuant to a Registration Statement filed and
declared effective under the Securities Act and the Securities Act Rules.

         "Merger" shall have the meaning ascribed to such term in the recitals
to this Agreement.

         "Merger Agreement" shall have the meaning ascribed to such term in the
recitals to this Agreement.

         "Notice of Intent to File" shall mean a written notice given by the
Company pursuant to Section 2.C or Section 3.A that the Company is preparing to
file a Primary Distribution Registration Statement or a Secondary Distribution
Registration Statement under the Securities Act relating to an Underwritten
Public Offering of Common Stock.

         "Notice of Registration Request" shall mean a written notice given by
the Company pursuant to Section 2.A or 4.A to each Stockholder that did not
send the applicable Registration Request, notifying such Stockholders that the
applicable Registration Request has been received by the Company and briefly
advising such Stockholders that they have the right to request Registration for
the distribution of their holdings of Common Stock, subject to the terms and
provisions of this Agreement.


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                                       3

<PAGE>   4



         "Person" shall mean an individual, a corporation, a partnership, a
trust, an unincorporated organization or a government or any agency or
political subdivision thereof.

         "Primary Distribution" shall mean an Underwritten Public Offering of
Common Stock offered, sold and delivered by the Company.

         "Primary Distribution Registration Statement" shall mean a
Registration Statement filed by the Company and declared effective under the
Securities Act and the Securities Act Rules relating to a Primary Distribution.

         "Public Offering" shall mean either an Underwritten Public Offering or
a Market Public Offering.

         "Registrable Shares" shall mean shares of Common Stock owned of record
by any Stockholder as to which such Stockholder has requested Registration
pursuant to the provisions of Section 2.A, 3.B or 4.A.

         "Registration" shall mean the registration under the registration
provisions of the Securities Act of the offering, sale and delivery of shares
of Common Stock.

         "Registration Expenses" shall mean the expenses associated with the
preparation and filing of any registration statement pursuant to Section 2.B,
3.C or 4.B herein and any sale covered thereby (including the reasonable fees
and expenses of legal counsel to the Affected Stockholders, fees related to
blue sky qualifications and filing fees in respect of the National Association
of Securities Dealers, Inc.), but excluding underwriting discounts or
commissions in respect of shares of Common Stock to be sold by the Affected
Stockholders.

         "Registration Request" shall mean a written notice from a Stockholder
requesting that the Company file a Registration Statement with respect to an
Underwritten Public Offering pursuant to Section 2.A herein or with respect to
a Public Offering pursuant to Section 4.A herein.

         "Registration Period" shall mean the period of time from the decision
of the Company to prepare and file a Registration Statement to and including
the effective date of such Registration Statement.

         "Registration Statement" shall mean a registration statement filed on
Form S-1, S-2 or S-3 (or any successor form) under the registration provisions
of the Securities Act and the Securities Act Rules.

         "Request Period" shall mean a period of fifteen (15) business days
after receipt of a Notice of Registration Request from the Company pursuant to
Section 2.A or 4.A by each Stockholder that did not send the applicable
Registration Request.


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                                       4

<PAGE>   5



         "Secondary Distribution" shall mean an Underwritten Public Offering of
Common Stock offered, sold and delivered by shareholders of the Company other
than the Stockholders, but including the holders of Common Stock subject to the
Capricorn Registration Rights Agreement.

         "Secondary Distribution Registration Statement" shall mean a
Registration Statement filed by the Company and declared effective under the
Securities Act and the Securities Act Rules relating to a Secondary
Distribution, including a distribution requested by the shareholders subject to
the Capricorn Registration Rights Agreement.

         "Securities Act" shall mean the Securities Act of 1933, as amended, as
the same shall be in effect at the date of any determination to be made
hereunder.

         "Securities Act Rules" shall mean the rules and regulations
promulgated by the Commission pursuant to the Securities Act, as the same shall
be in effect at the date of any determination to be made hereunder.

         "Stockholders" shall mean any or all of the Designated Stockholders
and any assignee of shares of Common Stock theretofore held by any of them;
provided, however, that, in the case of any such assignee, the offering, sale
and delivery of shares of such Common Stock by such assignee are not exempt
from the registration provisions of the Securities Act pursuant to Section 4(1)
thereof (without regard to the exemption provided by Rule 144 under the
Securities Act unless paragraph (k) of Rule 144 is applicable thereto); and
provided, further, that, in the case of any assignee, such assignee has agreed
to be bound by the provisions of this Agreement in accordance with Section 15
herein.

         "Supplemental Registration Request" shall mean a written notice given
by any Stockholder pursuant to the provisions of Section 2.A, 3.B or 4.A
herein, in which the Stockholder advises the Company as to the number of shares
of Common Stock that the Stockholder wishes to include in the applicable
Registration and in which the Stockholder agrees to (i) the specified method of
distribution, (ii) if applicable, the designated managing underwriter and (iii)
provide to the Company all such information as may be required by the Company
pursuant to Section 7 herein.

         "Underwritten Public Offering" shall mean a firm commitment
underwritten public offering for cash of shares of Common Stock pursuant to a
Registration Statement filed and declared effective under the Securities Act
and the Securities Act Rules.

                  B. Rules of Construction. Unless the context otherwise
requires, as used in this Agreement: (a) a term has the meaning ascribed to it;
(b)"including" means "including without limitation;" (c) words in the singular
include the plural; (d) words in the plural include the singular; (e) words
applicable to one gender shall be construed to apply to each gender; (f) the
terms "hereof," "herein," "hereby," "hereto" and derivative or similar words
refer to this entire Agreement; and (g) the term "Section" shall refer to the
specified Section of this Agreement.


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                                       5

<PAGE>   6



         Section 2.        Registration Rights.

         A. Registration Request. If the Company shall receive a Registration
Request from a Stockholder requesting that the Company file a Registration
Statement relating to an Underwritten Public Offering of shares of Common Stock
owned by such Stockholder, the Company shall give promptly (and in any event
within ten business days) a Notice of Registration Request to each other
Stockholder of the receipt of the Registration Request, enclosing a copy of the
Registration Request. During the Request Period, the other Stockholders shall
be entitled to give a Supplemental Registration Request to the Company in which
any or all such Stockholders request that the Company register pursuant to the
Securities Act and the Securities Act Rules all or any portion of the shares of
Common Stock owned by such Stockholders to be distributed in an Underwritten
Public Offering.

         B. Required Registration. At the end of the Request Period, the
Company shall, subject to the provisions of Section 2.C herein, prepare as
promptly as practicable and file a Registration Statement with respect to the
distribution in accordance with the applicable method of distribution of the
Registrable Shares to be included therein and use its best efforts to cause the
Registration Statement to become effective under the Securities Act in
accordance with the Securities Act Rules,.

         C. Suspension of Obligations. The Company's obligations under Section
2.B herein to prepare and file a Registration Statement and to seek its
effectiveness shall be subject to the following provisions:

                  i. The Company shall be required to file no more than two (2)
         Registration Statements pursuant to Section 2.A herein and one (1)
         Registration Statement pursuant to Section 4.B herein.

                  ii. The Company's obligations to prepare, file and seek
         effectiveness of a requested Registration Statement shall be
         suspended:

                           (a) if the aggregate number of Registrable Shares to
                  be included in such requested Registration Statement is less
                  than 500,000 shares of the then issued and outstanding Common
                  Stock;

                           (b) in any case, during the period from the time
                  that it gives a Notice of Intent to File to Stockholders that
                  it is preparing to file a Primary Distribution Registration
                  Statement until 90 days (or such shorter period as to which
                  the managing underwriter of the Primary Distribution to which
                  the Primary Distribution Registration Statement relates shall
                  consent in writing) have lapsed following the effective date
                  of a Primary Distribution Registration Statement under the
                  Securities Act; provided, however, that (A) such Notice of
                  Intent to File is given prior to the time of receipt by the
                  Company of a Registration Request by any Stockholder and (B)
                  that the Company shall use its best efforts to cause such
                  Primary Distribution

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<PAGE>   7



                  Registration Statement to be declared effective as promptly
                  as practicable; and provided, further, that the obligation to
                  file a Registration Statement on behalf of any Stockholder
                  shall be reinstated if the Company does not file a Primary
                  Distribution Registration Statement within 30 days after
                  giving the Notice of Intent to File;

                           (c) in any case, during the period from the time
                  that it gives a Notice of Intent to File to Stockholders that
                  it is preparing to file a Secondary Distribution Registration
                  Statement until 90 days (or such shorter period as to which
                  the managing underwriter of a Secondary Distribution effected
                  by means of a Secondary Distribution Registration Statement
                  shall consent in writing) have lapsed following the effective
                  date of the Secondary Distribution Registration Statement
                  under the Securities Act; provided, however, that (A) such
                  Notice of Intent to File is given prior to time of receipt by
                  the Company of a Registration Request by any Stockholder and
                  (B) that the Company shall use its best efforts to cause such
                  Secondary Distribution Registration Statement to be declared
                  effective as promptly as practicable; and provided, further,
                  that the obligation to file a Registration Statement on
                  behalf of any Stockholder shall be reinstated if the Company
                  does not file a Secondary Distribution Registration Statement
                  within 30 days after giving the Notice of Intent to File;

                           (d) if at the time of receipt by the Company of a
                  Registration Request the Company has material inside
                  information as to which it believes it has a valid business
                  purpose in refraining from disclosing publicly for the time
                  being and that current public disclosure of such information
                  would have a material adverse effect on the Company, for a
                  period commencing with the date of receipt of the
                  Registration Request and ending on the earlier of (a) 60 days
                  after such receipt of the Registration Request; (b) the
                  public announcement of such material inside information; or
                  (c) the date on which the Company gives the Stockholder who
                  issued the Registration Request a notice that suspension of
                  its obligation is no longer required; provided, however, that
                  the same material inside information shall not constitute a
                  basis for continuation of this suspension period; or

                           (e) if at the time of receipt by the Company of a
                  Registration Request the Company is not required to file
                  reports with the Commission pursuant to Section 15(d) of the
                  Securities Act or Section 13 of the Exchange Act.

                  iii. A Registration Statement filed pursuant to a
         Registration Request made under Section 2.B herein shall first include
         all Registrable Shares requested to be included by any and all
         Stockholders and, only after such inclusion, may include Common Stock
         being sold for the account of the Company or any other security
         holders. Any Common Stock to be offered on behalf of the Company or
         such other security holders will be included in such Registration
         Statement only to the extent that, in the reasonable opinion of the
         managing underwriter for the Underwritten Public Offering of
         Registrable Shares on behalf of

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                                       7

<PAGE>   8



         Stockholders, such inclusion will not materially adversely affect the
         distribution of Registrable Shares on behalf of such Stockholders.

         D. Underwriter. The selection of an underwriter for an Underwritten
Public Offering of Registrable Shares by Stockholders shall be subject to the
approval of the Company, which shall not be unreasonably withheld.

         E. Withdrawn Registration Statement. For purposes of Section 2.C(i)
herein, if a requested Registration Statement is filed and the Company
otherwise complies with its obligations hereunder, and

                  i. the Registration Statement is withdrawn with the consent
         of the Affected Stockholders as a result of a delay in the offering
         requested by the Company, then no requested Registration Statement
         shall be deemed to have been filed; or

                  ii. the Affected Stockholders cease to prosecute the Public
         Offering subject thereto actively and in good faith, the Company shall
         have the right to withdraw the Registration Statement without the
         consent of the Affected Stockholders and the requested Registration
         Statement shall be deemed to have been filed.

         Section 3.        Incidental/"Piggy-back" Registration.

         A. Notice of Intent to File. If the Company at any time proposes to
file a Primary Distribution Registration Statement or a Secondary Distribution
Registration Statement under the Securities Act relating to an Underwritten
Public Offering of Common Stock that would permit the inclusion therein of
shares of Common Stock to be distributed in accordance with the method of
distribution contemplated by such Registration Statement, the Company shall
give to each Stockholder a Notice of Intent to File promptly after a
determination has been made by the Company to prepare and file such
Registration Statement, but in any event not less than ten days before the
filing with the Commission of such Registration Statement, which notice shall
set forth the intended method of distribution (including the name of the
managing underwriter) of the securities proposed to be registered. The Notice
of Intent to File shall include an offer to include in such filing, subject to
the other provisions of this Agreement, such amount of Registrable Shares as
each Stockholder may request.

         B. Supplemental Registration Request. If any Stockholder wishes to
have Registrable Shares (including Earnout Shares) registered pursuant to this
Section 3, it shall advise the Company by giving a Supplemental Registration
Request within 20 days after the date of receipt of the Notice of Intent to
File (or such shorter period, but in any event not less than ten days, as the
Company shall specify in its Notice of Intent to File), setting forth the
amount of Registrable Shares for which Registration is requested.


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                                       8

<PAGE>   9



         C. Registration Obligation. Subject to the provisions of the next
sentence, the Company shall include all Registrable Shares specified in the
Supplemental Registration Requests received by it in accordance with Subsection
B of this Section 3. If, however, the managing underwriter of the proposed
Primary Distribution or Secondary Distribution shall advise the Company in
writing that, in the reasonable opinion of such managing underwriter, the
inclusion in the Registration Statement of the aggregate number of shares of
Common Stock requested by the Stockholders to be included in the Primary
Distribution or Secondary Distribution would materially adversely affect such
distribution of securities, then the Company shall so advise the Affected
Stockholders and the number of such shares of Common Stock included in the
Registration Statement shall be reduced to the number acceptable to such
managing underwriter and such reduced number of shares shall be allocated pro
rata among the Affected Stockholders based on the Registrable Shares held by
each. If any Stockholder does not agree to the terms of underwriting of such
Primary Distribution or Secondary Distribution, the shares of Common Stock
owned by such Stockholder shall be excluded therefrom by written notice from
the Company or such managing underwriter.

         D. Underwriting Agreement. Any obligation of the Company to include
shares of Common Stock of any Stockholder in a Registration Statement prepared
and filed pursuant to this Section 3 shall be conditioned upon the agreement of
such Stockholder to enter into an underwriting agreement with the Company,
other security holders, if any, and the managing underwriter of the Primary
Distribution or the Secondary Distribution of the type described in subsection
(H) of Section 5.

         Section 4.        Special Registration Right. Pursuant to the terms of
the Merger Agreement, the Designated Stockholders may in the future receive
Earnout Shares and, in order to provide liquidity to the Designated
Stockholders who receive such Earnout Shares, the Company has agreed to provide
a special right of Registration with respect to such Earnout Shares as in this
Section 4 provided.

         A. Notices. If, at any time during the term hereof, (i) some or all of
the Stockholders receive the record and beneficial ownership of Earnout Shares,
whether from the Company upon original issue pursuant to the Merger Agreement
or from one or more Designated Stockholders upon assignment not involving a
Public Offering, (ii), in the opinion of counsel reasonably satisfactory to the
Company, all or part of such Earnout Shares may not be sold by such
Stockholders without registration under the Securities Act or reliance on an
exemption from the registration provisions thereof (other than Section 4(1) of
the Securities Act) and (iii) the Company shall receive a Registration Request
from one or more such Stockholders requesting that the Company file a
Registration Statement relating to a Public Offering of shares of Common Stock
owned by such Stockholder or Stockholders, then the Company shall give promptly
(and in any event within ten business days) a Notice of Registration Request to
each other Stockholder who, to the knowledge of the Company, holds Earnout
Shares of the receipt of the Registration Request, enclosing a copy of the
Registration Request. During the Request Period, such other Stockholders shall
be entitled to give a Supplemental Registration Request to the Company in which
any or all such Stockholders request that the Company register pursuant to the
Securities Act and the Securities Act Rules all or

                         REGISTRATION RIGHTS AGREEMENT
                                       9

<PAGE>   10



any portion of the shares of Common Stock constituting Earnout Shares owned by
such Stockholders.

         B. Preparation and Filing. After the Request Period, the Company
shall, subject to the provisions of Section 2.C herein, prepare as promptly as
practicable and file a Registration Statement with respect to the offering,
sale and delivery by the Stockholders of all or any part of the shares of
Common Stock constituting Earnout Shares in accordance with the applicable
method of distribution of the Registrable Shares to be included therein
specified in the Registration Request and use its best efforts to cause the
Registration Statement to become effective under the Securities Act in
accordance with the Securities Act Rules. If so requested by such Affected
Stockholders, the Registration Statement shall be filed pursuant to Rule 415
(relating to "shelf registration statements") of the Securities Act Rules.

         C. Distribution. The applicable method of distribution of the
Registrable Shares shall be as requested by the Affected Stockholders and the
methods of distribution may include a distribution by one or more
broker-dealers named in the Registration Statement "at the market" pursuant to
a Market Public Offering. The Company agrees that it will amend the
Registration Statement or supplement the prospectus to include any material
information with respect to the plan of distribution not previously disclosed
in the Registration Statement or any material change to such information in the
Registration Statement.

         D. Limitations. The preparation and filing of a Registration Statement
pursuant to this Section 4 and the offering, sale and delivery of Registrable
Shares pursuant thereto shall be subject to the following limitations:

                  i. The Company shall be obligated to prepare, file and cause
         to become effective only one Registration Statement pursuant to this
         Section 4.

                  ii. Only Earnout Shares, whether received by a Designated
         Stockholder from the Company upon original issue pursuant to the
         Merger Agreement or received by another Stockholder from a Designated
         Stockholder upon an assignment not involving a Public Offering, may be
         included in a Registration Statement filed pursuant to this Section 4,
         and no sales of such shares shall be effected by the Affected
         Stockholders under such Registration Statement prior to the delivery
         to the Company of a certificate of the Affected Stockholders to such
         effect.

                  iii. The proposed and actual filing by the Company of a
         Registration Statement pursuant to this Section 4 shall not entitle
         any Stockholder to registration rights pursuant to Section 3 herein.

                  iv. The offering, sale and delivery of Registrable Shares
         pursuant to any Registration Statement filed pursuant to Rule 415
         (relating to "shelf registration statements") of the Securities Act
         Rules under this Section 4 shall be suspended if, at the time of any
         offering,

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                                       10

<PAGE>   11



         sale and delivery pursuant to a shelf registration statement, the
         Company has material inside information as to which it believes it has
         a valid business purpose in refraining from disclosing publicly for
         the time being and that current public disclosure of such information
         would have a material adverse effect on the Company. Such suspension
         period shall commence upon notice by the Company to the Affected
         Stockholders and shall continue until the earlier of (a) the
         expiration of 60 days thereafter; (b) the public announcement of such
         material inside information; or (c) the date on which the Company
         gives the Affected Stockholders notice that such suspension is no
         longer required; provided, however, that the same material inside
         information shall not constitute a basis for continuation of this
         suspension period.

                  v. The Company shall be obligated to maintain the
         effectiveness of a Registration Statement filed pursuant to Rule 415
         (relating to "shelf registration statements") of the Securities Act
         Rules under this Section 4 until the third anniversary of the
         effective date thereof and no longer.

         Section 5.        Registration Procedures. If the Company is required
by the provisions of Section 2, 3 or 4 to effect the Registration of any of the
Registrable Shares, the Company shall, as expeditiously as possible:

         A. Filing. Prepare and file with the Commission a Registration
Statement with respect to such shares of Common Stock and use its best efforts
to cause such Registration Statement to become and, subject to Subsection C of
this Section 5, remain effective.

         B. Amendments. Prepare and file with the Commission during the
Registration Period such amendments and supplements to such Registration
Statement and the prospectus used in connection therewith as may be necessary
to permit such Registration Statement to become effective in accordance with
the Securities Act and the Securities Act Rules and to ensure that such
Registration Statement and the prospectus used in connection therewith comply
with the disclosure standards of Section 11 of the Securities Act and Section
10(b) of the Exchange Act and that such prospectus complies with Section 10 of
the Securities Act, in each case during the Effective Period.

         C. Maintenance of Effectiveness. Subject to the provisions of Section
4.D herein, use its best efforts to maintain the effectiveness of such
Registration Statement and to ensure compliance of the prospectus contained
therein with Section 10(a) of the Securities Act for the Effective Period.

         D. Copies. Furnish to each Affected Stockholder (i) such number of
copies of such Registration Statement and of each amendment and supplement
thereto (in each case including all exhibits), such number of copies of the
prospectus included in such Registration Statement (including each preliminary
prospectus, summary prospectus and prospectus supplement), in conformity with
the requirements of the Securities Act, and such other documents as such
Affected Stockholder may reasonably require in order to facilitate the
offering, sale and delivery or other disposition of the Registrable Shares
owned by such Affected Stockholder and (ii), during the

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                                       11

<PAGE>   12



Registration Period and the Effective Period, copies of any written
correspondence or memoranda relating to oral communications in each case with
the Commission and copies of any request by the Commission for any amendment of
or supplement to the Registration Statement or the prospectus included therein
or for additional information.

         E. Blue Sky Laws. Use its best efforts to register or qualify the
Common Stock covered by such Registration Statement under the securities or
blue sky laws of such jurisdictions as the managing underwriter of such
Distribution may reasonably request (excluding, however, any jurisdiction in
which the filing would subject the Company to additional tax liability and any
jurisdiction in which the Company would thereby be required to execute a
general consent to service of process) and use all reasonable efforts to do
such other acts and things as may be required to enable the Affected
Stockholders to consummate the public sale or other disposition in such
jurisdictions of the Registrable Shares owned by such Affected Stockholders.

         F. Earnings Statement. Make available to its holders of Common Stock,
as soon as reasonably practicable, an earnings statement covering the period of
at least 12 months, but not more than 18 months, beginning with the first month
after the effective date of the Registration Statement, which earnings
statement shall satisfy the provisions of Section 11(a) of the Securities Act.

         G. Amended Prospectuses. Notify each Affected Stockholder immediately
if the Company shall become aware at any time during the Effective Period that
the prospectus included in the Registration Statement, as such prospectus may
be amended or supplemented, includes an untrue statement of a material fact or
omits to state any material fact required to be stated therein or necessary in
order to make the statements therein not misleading in light of the
circumstances then existing, and at the request of any Affected Stockholder to
prepare promptly and to furnish to each Affected Stockholder such number of
copies of an amended or supplemental prospectus as may be necessary so that, as
thereafter delivered to the purchasers of such Registrable Shares, such
prospectus shall not include an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary in order to
make the statements therein not misleading in the light of the circumstances
then existing.

         H. Underwriting Agreements. Enter into such agreements (including an
underwriting agreement in customary form and containing customary provisions
relating to legal opinions and accountants' letters, representations and
warranties and mutual indemnification and contribution between the Company and
the underwriters for the Affected Stockholders) and use all reasonable efforts
to take such other actions as the Affected Stockholders may reasonably request
in order to expedite or facilitate the disposition of such Registrable Shares.

         I. Inspection. Make available for inspection by the Affected
Stockholders, by any underwriter participating in any distribution to be
effected pursuant to such Registration Statement and by any attorney,
accountant or other agent retained by the Affected Stockholders or any such
underwriter all pertinent financial and other records, pertinent corporate
documents and properties of the Company and cause all of the Company's
officers, directors and employees to supply all such

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                                       12

<PAGE>   13



information requested by the Affected Stockholders, such underwriter, attorney,
accountant or agent, as is reasonably needed in connection with such
Registration.

         6. Classes of Stock. The parties hereto intend that any capital stock
sold by a Stockholder pursuant to the provisions of this Agreement shall be
Class A Common Stock if sold prior to January 1, 2002 or Common Stock if sold
thereafter. Accordingly, subject to the proviso to Article Fourth, II-A-4, of
the Certificate of Incorporation of the Company, each Stockholder agrees to
convert any Class B Common Stock that is included as Registrable Shares in a
Registration Statement filed pursuant to any provision of this Agreement into
Class A Common Stock prior to the effective date of such Registration Statement
under the Securities Act.

         7. Expenses; Limitations on Registration. The Registration Expenses
relating to any Registration effected by the Company pursuant to this Agreement
shall be for the account of the Company; provided, however, that any and all
underwriting discounts and commissions attributable to the sale of the shares
of Common Stock of the Affected Stockholders shall be for the account of the
Affected Stockholders.

         For purposes of this Section 7, the Company shall be obligated to pay
the fees and expenses of only one law firm representing the Affected
Stockholders. If more than one such firm shall represent the Affected
Stockholders in connection with a Registration under this Agreement, the
Affected Stockholders shall notify the Company as to which firm shall be deemed
to represent the Affected Stockholders for purposes of this Section 7.

         Section 8.        Stockholders' Information. The Affected Stockholders
shall provide all information reasonably requested by the Company for inclusion
in any Registration Statement to be filed hereunder. The actual provision of
such information shall be a condition precedent to the obligation of the
Company to take any action pursuant to this Agreement in respect of the
Registration of Registrable Shares of any Affected Stockholder.

         Section 9.        Indemnification.

         A. In connection with the Registration of any Registrable Shares under
the Securities Act pursuant to this Agreement, the Company agrees to indemnify
and hold harmless each Affected Stockholder, its partners, directors, officers
and employees, and each other Person, if any, who controls such Affected
Stockholder within the meaning of Section 15 of the Securities Act, against any
losses, claims, damages or liabilities, joint or several, to which such
Affected Stockholder or any such partner, director, officer, employee or
controlling Person may become subject under the Securities Act or any other
statute or at common law, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon (i)
any untrue statement or any alleged untrue statement of a material fact
contained in the Registration Statement or the prospectus included therein at
the time the Registration Statement is declared effective or any omission or
alleged omission of a material fact required to be stated therein or necessary
in order to make the statements therein not misleading or (ii) any untrue
statement of a material fact or alleged untrue

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                                       13

<PAGE>   14



statement of a material fact contained in the Registration Statement, any
preliminary prospectus, the prospectus included therein or any amendment or
supplement thereto or any omission or alleged omission of a material fact
required to be stated therein or necessary in order to make the statements
concerning the Company therein, in the light of the circumstances under which
they were made, not misleading and shall reimburse each Affected Stockholder
and each such partner, director, officer, employee and controlling Person for
any legal or other expenses reasonably incurred by such Affected Stockholder or
such partner, director, officer employee or controlling Person in connection
with investigating or defending any such loss, claim, damage, liability or
action; provided, however, that the Company shall not be liable in any such
case to the extent that any such loss, claim, damage or liability arises out of
or is based upon any untrue statement or alleged untrue statement or omission
or alleged omission made in such Registration Statement, preliminary
prospectus, prospectus, or amendment or supplement in reliance upon and in
conformity with written information furnished by or on behalf of an Affected
Stockholder to the Company expressly for use therein; and provided, further,
that the Company shall not be liable in any such case to the extent that any
such loss, claim, damage, liability or expense arises out of or is based upon
an untrue statement or alleged untrue statement or omission or alleged omission
in any preliminary prospectus if such untrue statement or alleged untrue
statement or omission or alleged omission was corrected in the final prospectus
included in the Registration Statement at the time it became effective and the
Affected Stockholder, in the case of a Market Public Offering, or the managing
underwriter, in the case of an Underwritten Public Offering, failed to provide
the final prospectus as required by the Securities Act and the Securities Act
Rules. Such indemnity shall remain in full force and effect regardless of any
investigation made by or on behalf of any Affected Stockholder or any such
partner, director, officer, employee or controlling Person, and shall survive
the transfer of such securities by any Affected Stockholder.

         B. Each Affected Stockholder agrees to indemnify and hold harmless the
Company, its directors, officers and employees, each other Person, if any, who
controls the Company and each other Affected Stockholder against any losses,
claims, damages or liabilities, joint or several, to which the Company, any
such director, officer or employee, any such controlling Person or such other
Affected Stockholder may become subject under the Securities Act or any other
statute or at common law, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon (i)
any untrue statement or any alleged untrue statement of a material fact
contained in the Registration Statement or the prospectus included therein at
the time the Registration Statement is declared effective or any omission or
alleged omission of a material fact required to be stated therein or necessary
in order to make the statements therein not misleading or (ii) any untrue
statement of a material fact or alleged untrue statement of a material fact
contained in the Registration Statement, any preliminary prospectus, the
prospectus included therein or any amendment or supplement thereto or any
omission or alleged omission of a material fact required to be stated therein
or necessary in order to make the statements concerning the Company therein, in
the light of the circumstances under which they were made, not misleading, in
each case to the extent, but only to the extent, that such alleged untrue
statement or alleged omission was made in such Registration Statement,
preliminary prospectus, prospectus, amendment or supplement in reliance upon
and in conformity with written information furnished by or on behalf of an
Affected

                         REGISTRATION RIGHTS AGREEMENT
                                       14

<PAGE>   15


Stockholder to the Company expressly for use therein, and shall reimburse the
Company or such director, officer, employee or other Person for any legal or any
other expenses reasonably incurred in connection with investigating or defending
any such loss, claim, damage, liability or action.

         C. Promptly after receipt by an indemnified party hereunder of written
notice of the commencement of any action or proceeding involving a claim
referred to in subsection (A) or (B) of this Section 9, such indemnified party
will, if a claim in respect thereof is to be made against an indemnifying
party, give written notice to the latter of the commencement of such action;
provided, that the failure of any indemnified party to give notice as provided
herein shall not relieve the indemnifying party of its obligation under this
subsection C to the extent the indemnifying party is not materially prejudiced
by such failure. In case any such action is brought against an indemnified
party, the indemnified party shall permit the indemnifying party to assume the
defense of such action or proceeding, provided that counsel for the
indemnifying party, who shall conduct the defense of such action or proceeding,
shall be approved by the indemnified party (whose approval shall not be
unreasonably withheld) and the indemnified party may participate in such
defense (in which case, such participation shall be at such indemnified party's
expense, unless in such indemnified party's reasonable judgment a conflict of
interest between such indemnified party and the indemnifying party shall exist
in respect of such claim, in which event the indemnifying party shall pay the
reasonable fees and expense of separate counsel for the indemnified party). No
indemnifying party shall consent to entry of any judgment or enter into any
settlement that does not include as an unconditional term thereof the giving by
the claimant or plaintiff to such indemnified party of a release from all
liability in respect to such claim or litigation. The indemnifying party shall
not, in connection with any proceeding or related proceedings in the same
jurisdiction, be liable for the fees and expenses of more than one separate
firm for all indemnified parties. The indemnifying party shall not be liable
for any settlement of any proceeding effected without its written consent.

         D. Indemnification similar to that specified in the preceding
subsections of this Section 9 shall be given by the Company and each Affected
Stockholder (with such modifications as shall be appropriate) with respect to
liability related to any required registration or other qualification of
Registrable Shares under any Federal or state law or regulation of governmental
authority other than the Securities Act.

         E. If the indemnification provided for in this Section 9 is
unavailable or insufficient to hold harmless an indemnified party under
subsection (A) or (B) above, then the indemnifying party shall contribute to
the amount paid or payable by such indemnified party as a result of the losses,
claims, damages or liabilities referred to in subsection (A) or (B) above, in
such proportion as is appropriate to reflect the relative fault of the Company,
on the one hand, and each Affected Stockholder, on the other, in connection
with the statements or omissions that resulted in such losses, claims, damages
or liabilities, as well as any other relevant equitable considerations. The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by
the Company or such Affected Stockholder and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
untrue statement or omission. The

                         REGISTRATION RIGHTS AGREEMENT
                                       15

<PAGE>   16



Company and the Affected Stockholders agree that it would not be just and
equitable if contributions pursuant to this subsection (E) were to be determined
by pro rata allocation or by any other method of allocation that does not take
account of the equitable considerations referred to in the first sentence of
this subsection (E). The amount paid by an indemnified party as a result of the
losses, claims, damages or liabilities referred to in the first sentence of
this subsection (E) shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any action or claim (which shall be limited as provided in
subsection (C) above if the indemnifying party has assumed the defense of any
such action in accordance with the provisions thereof) that is the subject of
this subsection (E). Notwithstanding the provisions of this subsection (E), in
respect of any loss, claim, damage or liability based upon any untrue or
alleged untrue statement of a material fact or omission or alleged omission to
state a material fact that relates to information other than information
supplied by any Affected Stockholder, no Affected Stockholder shall be required
to contribute any amount in excess of the amount by which the total price at
which the Registrable Shares offered by it and distributed to the public
exceeds the amount of any damages that such Affected Stockholder has otherwise
been required to pay by reason of such untrue or alleged untrue statement or
omission or alleged omission. No Person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Act) shall be entitled to
contribution from any Person who was not guilty of such fraudulent
misrepresentation. Promptly after receipt by an indemnified party under this
subsection (E) of notice of the commencement of any action against such party
in respect of which a claim for contribution may be made against an
indemnifying party under this subsection (E), such indemnified party shall
notify the indemnifying party in writing of the commencement thereof if the
notice specified in subsection (C) above has not been given with respect to
such action; but the omission so to notify the indemnifying party shall not
relieve it from any liability which it may have to any indemnified party under
this subsection (E) to the extent such omission is not prejudicial.

         Section 10.       Public Availability of Information. The Company shall
comply with all applicable public information reporting requirements of the
Commission, to the extent required from time to time to enable each Stockholder
to sell Registrable Shares without Registration under the Securities Act within
the limitation of the exemptions provided by (i) Rule 144 under the Securities
Act, as such Rule may be amended from time to time, or (ii) any similar rule or
regulation hereafter adopted by the Commission. Upon the request of any
Stockholder, the Company will deliver to such Stockholder a written statement
as to whether it has complied with such requirements.

         Section 11.       Supplying Information. The Company shall cooperate
with each Stockholder in supplying such information as may be necessary for
such Stockholder to complete and file any information reporting forms presently
or hereafter required by the Commission as a condition to the availability of
an exemption from the Securities Act for the sale of any Registrable Shares.

         Section 12.       Specific Performance. Each party hereto acknowledges
and agrees that each other party hereto would be irreparably harmed and would
have no adequate remedy of law if any of the provisions of this Agreement were
not performed in accordance with their specific terms or were otherwise
breached. Accordingly, it is agreed that, in addition to any other remedies by
law

                         REGISTRATION RIGHTS AGREEMENT
                                       16

<PAGE>   17


or in equity which may be available, the parties hereto shall be entitled to
obtain preliminary and permanent injunctive relief with respect to any breach
or threatened breach of, or otherwise obtain specific performance of, the
covenants and other agreements contained in this Agreement.

         Section 13.       Representations and Warranties of the Company. The
Company represents and warrants to each Stockholder that, as of the date of
this Agreement, (a) the Company is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware and has
the corporate power and authority to enter into this Agreement and to carry out
its obligations hereunder, (b) the execution and delivery of this Agreement by
the Company and the consummation by the Company of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
on the part of the Company and no other corporate proceedings on the part of
the Company are necessary to authorize this Agreement or any of the
transactions contemplated hereby, and (c) this Agreement has been duly executed
and delivered by the Company and constitutes a valid and binding obligation of
the Company, and, assuming that this Agreement constitutes a valid and binding
obligation of each of the Designated Stockholders, is enforceable against the
Company in accordance with its terms, subject to applicable bankruptcy,
reorganization, insolvency, moratorium, fraudulent conveyance and similar laws
affecting creditors' rights generally from time to time and to general
principles of equity and except as the enforceability thereof may be limited by
considerations of public policy.

         Section 14.       Representations and Warranties. Each of the
Designated Stockholders represents and warrants to the Company that, as of the
date of this Agreement, (a) to the extent it is a legal entity, it is an
organization duly organized, validly existing and in good standing under the
laws of the jurisdiction of its organization and has the organizational power
and authority to enter into this Agreement and to carry out its obligations
hereunder, (b) to the extent it is a legal entity, the execution and delivery
of this Agreement by such Stockholder and the consummation by such Stockholder
of the transactions contemplated hereby have been duly authorized by all
necessary organizational action on the part of such Stockholder and no other
organizational proceedings on the part of such Stockholder are necessary to
authorize this Agreement or any of the transactions contemplated hereby and (c)
this Agreement has been duly executed and delivered by such Stockholder and
constitutes a valid and binding obligation of such Stockholder and, assuming
that this Agreement constitutes a valid and binding obligation of the Company,
is enforceable against such Stockholder in accordance with its terms, subject
to applicable bankruptcy, reorganization, insolvency, moratorium, fraudulent
conveyance and similar laws affecting creditors' rights generally from time to
time and to general principles of equity and except as the enforceability
thereof may be limited by considerations of public policy.

         Section 15.       Expiration. This Agreement and the rights, benefits,
duties and obligations hereunder of the parties hereto and their successors and
permitted assigns shall expire and be of no further force or effect on May 31,
2004.

         Section 16.       Notices. All notices and other communications
hereunder shall be in writing and shall be deemed given if delivered personally
or transmitted by telex, telegram or facsimile

                         REGISTRATION RIGHTS AGREEMENT
                                       17

<PAGE>   18



transmission or mailed by registered or certified mail (return receipt
requested) to the parties at the following addresses (or at such other address
for a party as shall be specified by like notice):

         (a)      if to any Designated Stockholder, to such Designated
                  Stockholder at the address of such Designated Stockholder set
                  forth on Annex A hereto

                  with a copy to:
                  Reed Smith Shaw & McClay LP
                  One Liberty Place
                  Philadelphia, PA 19103
                  Attn.:  Ms. Lori L. Lasher
                  Facsimile: (215) 851-1420

         (b)      if to the Company, to:
                  NATCO Group, Inc.
                  Brookhollow Central III
                  2950 North Loop West
                  Suite 750
                  Houston, Texas 77092
                  Attn.:  Mr. Nathaniel A. Gregory, Chairman and Chief
                                    Executive Officer
                  Facsimile No.:  (713) 683-7814

                  with a copy to:
                  Vinson & Elkins L.L.P.
                  First City Tower
                  1001 Fannin Street
                  Houston, Texas 77002-6760
                  Attn.:  Mr. William E. Joor III
                  Facsimile No.:  (713) 615-5201

         Section 17.       Benefit and Assignment.

                  (a) The terms and conditions of this Agreement shall inure to
         the benefit of and be binding on the parties hereto and their
         respective successors and permitted assigns; provided, however, that,
         except as otherwise provided in this Section, this Agreement shall not
         be assignable by any party hereto except by operation of law or with
         the prior express written consent of the other parties hereto. Nothing
         in this Agreement, express or implied, is intended to confer upon any
         party, other than the parties hereto and their respective successors
         and permitted assigns, any rights, remedies, obligations or
         liabilities under or by reason of this Agreement.


                         REGISTRATION RIGHTS AGREEMENT
                                       18

<PAGE>   19



                  (b) If any Designated Stockholder shall transfer and assign
         shares of Common Stock to any Person otherwise than in an Underwritten
         Public Offering (including any transfer on foreclosure of indebtedness
         secured by the grant of a security interest in such shares of Common
         Stock), such Designated Stockholder (or any Person who shall be a
         transferee or assignee pursuant to this subsection (b)), as the case
         may be, may assign such portion of its rights and benefits under this
         Agreement as is necessary to permit such Person to act as a
         Stockholder hereunder; provided, however, that such Person shall agree
         in writing to be bound by the duties and obligations of a Stockholder
         hereunder.

         Section 18.       Governing Law. This Agreement shall be governed by
and construed in accordance with the laws of the State of Delaware without
regard to the application of doctrines of conflicts of law.

         Section 19.            Counterparts. This Agreement may be executed
simultaneously in one or more counterparts, any of which may have been
transmitted and received by facsimile transmission and each of which shall be
deemed to be an original but all of which together shall constitute one and the
same instrument.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed by their officers thereunto duly authorized.

                                 NATCO GROUP, INC.



                                 BY:  /s/ NATHANIEL A. GREGORY
                                    -------------------------------------------
                                          Nathaniel A. Gregory
                                          Chairman and Chief Executive Officer

                                 THE DESIGNATED STOCKHOLDERS

                             /s/ WILLIAM R. DIMELING
                           ----------------------------------------------------
                                 William R. Dimeling

                             /s/ ROBERT J. HAMAKER
                           ----------------------------------------------------
                                 Robert J. Hamaker

                             /s/ DOUGLAS P. HELLER
                           ----------------------------------------------------
                                 Douglas P. Heller

                             /s/ GEORGE K. HICKOX, JR.
                           ----------------------------------------------------
                                 George K. Hickox, Jr.


                         REGISTRATION RIGHTS AGREEMENT
                                       19

<PAGE>   20



                             /s/ RALPH M. KELLY
                           ----------------------------------------------------
                                 Ralph M. Kelly

                             /s/ STEVEN G. PARK
                           ----------------------------------------------------
                                 Steven G. Park

                             /s/ RICHARD R. SCHREIBER
                           ----------------------------------------------------
                                 Richard R. Schreiber

                             /s/ JOHN C. TUTEN, JR.
                           ----------------------------------------------------
                                 John C. Tuten, Jr.


                           THE 1998 TRUST FOR JODY SMITH HAMAKER


                             By:    /s/ JODY SMITH HAMAKER
                                -----------------------------------------------
                             Name:      Jody Smith Hamaker
                                  ---------------------------------------------
                             Title:     Trustee
                                   --------------------------------------------


                           BANC ONE CAPITAL PARTNERS II, LTD.


                             By: /s/ EARLE J. BENSING
                                -----------------------------------------------
                             Name:  Earle J. Bensing
                             Title: Authorized Signer


                         REGISTRATION RIGHTS AGREEMENT
                                       20


<PAGE>   1
                                                                    EXHIBIT 5.1


                      [VINSON & ELKINS L.L.P. LETTERHEAD]


                            _________________, 1999





NATCO Group Inc.
Brookhollow Central III
2950 North Loop West, Suite 750
Houston, Texas 77092

Ladies and Gentlemen:

         We are acting as counsel for NATCO Group Inc., a Delaware corporation
(the "Company"), in connection with the proposed offer and sale (the
"Offering") by the Company and Capricorn Investors, L.P. (the "Selling
Stockholder") to the several underwriters (the "Underwriters") set forth in the
underwriting agreement (the "Underwriting Agreement") dated as of
______________, 1999 among the Company and the representatives of the
Underwriters, pursuant to the prospectus forming a part of a Registration
Statement on Form S-1, File No. 333-48851, originally filed with the Securities
and Exchange Commission on March 30, 1998 (such Registration Statement, as
amended at the effective date thereof, being referred to herein as the
"Registration Statement"), of an aggregate of ___________ shares of Common
Stock, par value $.01 per share ("Common Stock"), of the Company, together with
a maximum of __________ shares of Common Stock which may be sold to the
Underwriters pursuant to the over-allotment option provided in the Underwriting
Agreement. Capitalized terms used but not defined herein have the meanings set
forth in the Registration Statement.

         We are rendering this opinion as of the time the Registration
Statement becomes effective in accordance with Section 8(a) of the Securities
Act of 1933, as amended.

         In connection with this opinion, we have assumed that the Registration
Statement, and any amendments thereto (including post-effective amendments),
will have become effective and the shares of Common Stock will be issued and
sold in compliance with applicable federal and state securities laws and in the
manner described in the Registration Statement and the applicable prospectus.

         In connection with the opinion expressed herein, we have examined,
among other things, the Restated Certificate of Incorporation, as amended, and
the Amended and Restated Bylaws of the Company, the records of corporate
proceedings that have occurred prior to the date hereof with respect to the
Offering, the Registration Statement and the form of Underwriting Agreement to
be



<PAGE>   2


NATCO Group Inc.
Page 2
______________, 1999

executed among the Company, Donaldson, Lufkin & Jenrette Securities
Corporation, Salomon Smith Barney Inc. and Simmons & Company International, as
representatives of the several Underwriters. We have also reviewed such
questions of law as we have deemed necessary or appropriate.

         Based upon the foregoing, we are of the opinion that (i) the shares of
Common Stock proposed to be issued and sold by the Company to the Underwriters
have been validly authorized for issuance and, upon the issuance and delivery
thereof in accordance with the provisions of the Underwriting Agreement
(assuming that it is executed in the form reviewed by us), and as set forth in
the Registration Statement, will be validly issued, fully paid and
nonassessable and (ii) the shares of Common Stock proposed to be sold by the
Selling Stockholder to the Underwriters, when they were issued to the Selling
Stockholder, were duly authorized, validly issued and fully paid and
nonassessable.

         This opinion is limited in all respects to the General Corporation Law
of the State of Delaware.

         We hereby consent to the statements with respect to us under the
heading "Legal Matters" in the prospectus forming a part of the Registration
Statement and to the filing of this opinion as an exhibit to the Registration
Statement, but we do not thereby admit that we are within the class of persons
whose consent is required under the provisions of the Securities Act of 1933,
as amended, or the rules and regulations of the Securities and Exchange
Commission issued thereunder.

                               Very truly yours,



                               VINSON & ELKINS L.L.P.






<PAGE>   1
                                                                  EXHIBIT 10.12


                              EMPLOYMENT AGREEMENT
                              --------------------

          THIS EMPLOYMENT AGREEMENT, made as of this 31st day of July, 1997, by
and between Cummings Point Industries, Inc., a corporation organized and
existing under the laws of the State of Delaware (hereinafter referred to as
"NATCO"), and Nathaniel A. Gregory (hereinafter referred to as "the Executive").

                              W I T N E S S E T H
                              - - - - - - - - - -

          WHEREAS, the Executive and NATCO entered into a stock option
agreement dated March 15, 1994, as amended on the 31st day of July, 1996 (the
"Previous Stock Option Agreement") under which the Executive received options
to purchase shares of common stock in a subsidiary of NATCO under certain terms
and conditions;

          WHEREAS, the Executive and NATCO wish to update, clarify and amend
the Previous Stock Option Agreement, primarily to substitute options to
purchase shares of common stock in NATCO in place of existing options to
purchase subsidiary stock, to specify terms and conditions for such options and
to further modify other provisions as necessary;

          WHEREAS, the Executive and NATCO are therefore simultaneously
herewith entering into a Stock Option Agreement (the "Stock Option Agreement"),
attached hereto as Exhibit A, which supercedes the Previous Stock Option
Agreement;

          WHEREAS, the Executive and a subsidiary of NATCO entered into an
employment agreement dated March 15, 1994, as amended on the 31st day of July,
1996 (the "Previous Employment Agreement"), under which the Executive has
agreed to employment by such subsidiary under certain terms and conditions, and
under which the Executive is entitled to certain compensation, including
various provisions for special bonus compensation, under certain terms and
conditions;

          WHEREAS, the Executive and NATCO wish to update, clarify, and amend
the Previous Employment Agreement, primarily to substitute employment by NATCO
in place of existing employment by a subsidiary, to specify terms and
conditions for such employment and for Executive's compensation, including
various provisions for special bonus compensation, and to further modify other
provisions as necessary;

          and WHEREAS, NATCO desires to continue the Executive in the
employment capacity hereinafter set forth and the Executive agrees to accept
such employment on the terms and conditions hereinafter set forth;

          NOW, THEREFORE, in consideration of the promises and mutual covenants
herein contained, it is hereby agreed by and between NATCO and the Executive as
follows:
<PAGE>   2
          1.   CAPACITY AND SERVICES

          (a)  NATCO hereby agrees to continue to employ the Executive and the
Executive hereby agrees to accept such employment by NATCO as Chairman and Chief
Executive Officer of NATCO on the terms and conditions set forth herein. The
employment of the Executive pursuant to this Employment Agreement shall commence
on July 1, 1997 and continue through the Period of Active Employment, as defined
in Section 1(e) of this Employment Agreement. In his capacity as Chairman and
Chief Executive Officer of NATCO, the Executive shall assume such
responsibilities, perform such duties, and have such authority, as may from time
to time be assigned or delegated by the Board of Directors of NATCO (the may
from time to time be assigned or delegated by the Board of Directors of NATCO
(the "Board") consistent with the Executive's position. The Executive agrees to
perform such duties in accordance with the By-laws of NATCO, the Board's
instructions, and NATCO's policies.

          (b)  The Executive shall devote a significant portion of his business
time to his duties hereunder, provided, however, that the foregoing shall not
prevent the Executive from devoting time and effort to the business of
Capricorn Holdings, LLC, of which Executive is a Member, or from serving as a
member of the board of directors of a corporation if the Board, or the
appropriate Committee thereof, determines in its sole discretion that such
membership is not adverse to the interests of NATCO. Subject to the foregoing,
the Executive shall not engage in any business activities that are directly or
indirectly competitive with any business then conducted by NATCO or any of its
affiliated companies.

          (c)  The Executive may be an investor, shareholder, joint venturer, or
partner (hereinafter referred to as an "Investor") in any enterprise,
association, corporation, joint venture or partnership (hereinafter referred to
as an "Investment"), provided, however, that any such Investment does not (i)
violate NATCO's conflict of interest policy as in effect from time to time,
(ii) require the Executive's involvement in the management (except service on
boards of directors to the extent permitted by Section 1(b) of this Employment
Agreement) or operation of such Investment (recognizing that the Executive
shall be permitted to monitor and oversee the Investment, as would any prudent
Investor) or (iii) interfere with the performance of the Executive's duties and
obligations hereunder.

          (d)  The Executive shall fully and faithfully discharge his duties
under the direction of the Board.

          (e)  "Period of Active Employment", as used herein, shall mean the
period beginning on July 1, 1997 and terminating on the date on which the first
of the following events occurs:

               (1)  The death of the Executive;

               (2)  The disability of the Executive, as provided in Section 8
     of this Employment Agreement;

               (3)  The termination of the Executive's employment, as provided
in Section 12 of this Employment Agreement; or




                                       2
<PAGE>   3

               (4)  expiration of this Employment Agreement, as provided in
     Section 2 hereof (or as such expiration may be extended pursuant to
     Section 3 hereof).

          2.   TERM OF EMPLOYMENT.

          The term of the Executive's employment hereunder shall commence on
July 1, 1997 and shall expire on July 1, 1998 unless the Executive's employment
is terminated before that time, as provided in Section 1(e) of this Employment
Agreement or unless this Employment Agreement is renewed as provided in Section
3 hereof.

          3.   RENEWAL.

          This Employment Agreement shall be automatically renewed for one
additional year after the expiration of the stated term, unless NATCO or the
Executive gives notice, in writing, at least thirty (30) days prior to the
expiration of this Employment Agreement (or any renewal of this Employment
Agreement) of its desire to terminate the Employment Agreement or modify its
terms. The Executive expressly acknowledges, however, that NATCO has not made
any representations to the Executive as to the possible or expected duration of
this Employment Agreement beyond July 1, 1998.

          4.   COMPENSATION AND BENEFITS.

          (a)  During the Period of Active Employment, NATCO shall pay to the
Executive as base compensation for his services hereunder, a base salary of
$350,000 per annum ("Base Salary"), payable in arrears. Amounts payable shall
be reduced by standard withholding and other authorized deductions.

          (b)  During the Period of Active Employment, the Executive shall have
the right to participate in any of NATCO's fringe benefit and insurance plans
presently in effect or that may be established for the benefit of executives of
NATCO. NATCO reserves the right to modify, suspend or discontinue any or all
such plans or benefits at any time without recourse by the Executive.

          (c)  The Executive shall be entitled to take vacation in accordance
with NATCO's policy and practices for senior executives.

          (d)  During the Period of Active Employment, NATCO shall, upon
receipt of appropriate itemized vouchers for expenses, submitted to NATCO on a
monthly basis in accordance with NATCO's procedures from time to time in
effect, reimburse the Executive for any reasonable and actual costs of leasing
an automobile for the Executive's business and private use during the Period of
Active Employment ("Monthly Automobile Lease Cost"). The make, model, color and
year of the leased automobile described herein may be selected by the
Executive. In addition to reimbursement of the Monthly Automobile Lease Cost,
during the Period of Active Employment, NATCO shall, upon receipt of itemized
vouchers for expenses, submitted to NATCO on a monthly basis in accordance with
NATCO's procedures from time to time in effect, reimburse the Executive for his
reasonable and necessary expenses, including




                                       3
<PAGE>   4
maintenance, repairs, gasoline and insurance, incurred in the operation of the
leased automobile described herein.

          (e)  During the Period of Active Employment, NATCO shall reimburse
the Executive for all actual and reasonable expenses associated with the
Executive's personal travel between Houston, Texas and Greenwich, Connecticut.

          5.   BONUS COMPENSATION.

          (a)  During each fiscal year in which the Executive is employed by
NATCO under the terms and conditions of this Employment Agreement, the
Executive will be eligible to receive Bonus Compensation in accordance with
the policies and practices of NATCO. For these purposes, Executive's "target"
annual bonus will be 60% of base compensation. The Board will determine,
annually, the criteria which determine "target" performance.

          (b)  In the event the Executive is employed by NATCO under the terms
and conditions of this Employment Agreement for a period less than any full
fiscal year and the Executive's employment with NATCO has not terminated
pursuant to Section 11(a) or Section 11(c) hereof, any Bonus Compensation
payable to the Executive under Section 5(a) of this Employment Agreement shall
be prorated accordingly. If the Executive's employment with NATCO terminates as
provided in Section 11(a) or Section 11(c) hereof, the Executive shall not be
eligible for any Bonus Compensation under the Employment Agreement.

          (c)  Any Bonus Compensation payment to which the Executive is entitled
under the terms of Section 5(a) of this Employment Agreement shall be paid to
the Executive as soon as practicable after financial statements have been
prepared for the fiscal period to which such Bonus Compensation payment
relates, but no later than ninety days from the date such financial
statements shall have been prepared.

          (d)  During each fiscal year in which the Executive is employed by
NATCO under the terms and conditions of this Employment Agreement, the
Executive will be eligible to receive additional bonus payments as the Board
deems appropriate. Although it is the parties' intention that the Executive
will receive a bonus payment if the Executive raises new capital for NATCO, any
bonus payment awarded under this Section 5(a) shall be at the sole discretion
of the Board.

          (e)  In the event of a "Sale or Public Offering" as defined in this
Section 5(c), NATCO shall pay to the Executive a bonus (in addition to any
other bonuses for which Executive might be eligible under this Section 5 or
otherwise) equal to one and one-half percent (1.5%) of the value of all
securities owned by stockholders of CPI, including common stock valued at the
price per share received in either the Sale or Public Offering, and any debt
held by Stockholders. Any bonus to which the Executive is entitled under this
Section 5(a) shall be paid in cash to the Executive coterminous with or as soon
as practicable after the closing of the Sale or Public Offering, but in any
event no later than ninety days after such closing. For purposes of this Section
5, a Sale or Public Offering will have occurred in the event of: (i) a sale,
merger, reorganization or other transaction involving NATCO which results in a
Change of Control as

                                       4
<PAGE>   5
defined in Section 14(b), and in which stockholders of CPI shall receive any
combination of cash, debt, preferred stock, common stock of any unaffiliated
party, or similar securities in exchange for no less than fifty percent (50%) of
CPI's common stock ownership in NATCO as of the date of this agreement, or (ii)
a registration and public offering under the Securities Act of common shares of
NATCO as contemplated in the Stockholder's Agreement attached hereto as Exhibit
B.

          (f)  All references to Bonus Compensation herein are to the gross
amounts thereof. NATCO shall have the right to deduct therefrom all taxes which
may be required to be deducted or withheld under any provision of applicable
law now in effect or which may become effective any time during the term of this
Employment Agreement.


          6.   CERTAIN EXPENSES INCIDENT TO EMPLOYMENT.

          Subject to such rules and procedures as from time to time are
specified by NATCO or the Board, NATCO agrees to reimburse the Executive for
travel, entertainment or other reasonable business expenses or disbursements
incurred ordinarily by the Executive as part of and in connection with the
performance of his duties under this Employment Agreement.

          7.   DISABILITY.

          "Disability", as used in Section 1(e) of this Employment Agreement,
shall mean a physical or mental incapacity of the Executive which has prevented
him from performing the duties customarily assigned him by the Board for ninety
(90) days, whether or not consecutive, out of any twelve (12) consecutive
months and which thereafter can reasonably be expected, in the judgment of a
physician selected by NATCO, to continue.

          8.   AGREEMENT NOT TO COMPETE.

          Except as otherwise provided by this Employment Agreement, the
Executive hereby agrees that, during the Period of Active Employment, the
Executive will not directly or indirectly, either through any form of ownership
(other than ownership of securities of a publicly-held corporation of which the
Executive owns less than one percent of any class of outstanding securities),
or as a director, officer, principal agent, employer, advisor, consultant,
co-partner, or in any individual or representative capacity, either for his own
benefit or for the benefit of any other person, firm, corporation or other
entity, engage in any business that is in competition with NATCO or any of its
affiliated companies.

          9.   INTANGIBLE AND OTHER PROPERTY RIGHTS.

          (a)  All right, title and interest of every kind and nature
whatsoever, whether now known or unknown, in and to any intangible property,
including all trade names, unregistered trademarks and service marks, brand
names, patents, copyrights, registered trademarks and service marks and all
trade secrets and confidential know-how (the "Intangible Property"), invented,
created, written, developed, furnished, produced or disclosed by the Executive
hereunder shall, as between the parties hereto, be and remain the sole and
exclusive

                                       5


<PAGE>   6
property of NATCO for any and all purposes and uses whatsoever, and the
Executive shall have no right, title or interest of any kind or nature therein
or thereto, or in or to any results or proceeds therefrom. The Executive will,
at the request of NATCO, execute such assignments, certificates and other
instruments as NATCO may from time to time deem necessary or desirable to
evidence, establish, maintain, perfect, protect, enforce or defend its right,
title and interest in and to any of the foregoing.

          (b)  The Executive agrees that all "Intangible Property", materials,
books, files, reports, correspondence, records and documents (collectively
"NATCO Material") used, prepared or made available to the Executive in the
course of rendering his services to NATCO hereunder shall remain the property
of NATCO. At the end of the Period of Active Employment, all NATCO Material
shall be returned immediately to NATCO.

          10.  CONFIDENTIALITY.

          The Executive shall hold in a fiduciary capacity for the benefit of
NATCO all secret or confidential information, knowledge or data relating to
NATCO and its affiliates, which shall have been obtained by the Executive
during his employment by NATCO and which shall not be public knowledge. After
termination of the Executive's employment with NATCO, he shall not, without the
prior written consent of the Board, communicate or divulge any such
information, knowledge or data to anyone other than the Board and those
designated by the Board.

          11.  TERMINATION.

          (a)  NATCO may terminate the Executive's employment under this
Employment Agreement for just cause by giving the Executive ten (10) days
advance written notice and an opportunity to be heard before the Board prior to
such termination. In the event that the Executive's employment under this
Employment Agreement is terminated for "cause", NATCO shall have no further
obligations or responsibilities hereunder (except for Base Salary amounts earned
but not yet paid to the Executive through the date of the Executive's
termination) and the Executive shall not be entitled to receive any Bonus
Compensation pursuant to Section 5 of this Employment Agreement or any
severance pay specified in any severance plan or policy that NATCO presently
has in effect or that NATCO may establish for employees of NATCO. Without
limiting the foregoing, any one or more of the following events shall
constitute "cause":

                    (1)  Theft, fraud, embezzlement, dishonesty or other
          similar behavior by the Executive;

                    (2)  Any habitual neglect of duty or misconduct of the
          Executive in discharging any of his duties and responsibilities
          hereunder;

                    (3)  A material breach by the Executive of the terms of
          this Employment Agreement; or


                                      -6-
<PAGE>   7
          (4) The Executive's conviction of a felony or of any crime involving
     moral turpitude.

     (b) In the event that NATCO terminates the Executive's employment under
this Employment Agreement for any reason other than just cause, the Executive
shall be entitled to severance pay in accordance with any severance plan or
policy that NATCO then has in effect.

     (c) If the Executive terminates this Employment Agreement for any reason,
other than by reason of NATCO's material breach of the terms of this Employment
Agreement, NATCO shall have no further obligations or responsibilities hereunder
(except for Base Salary amounts earned but not yet paid to the Executive through
the date of the Executive's termination) and the Executive shall not be entitled
to receive any Bonus Compensation pursuant to Section 5 of this Employment
Agreement or any severance pay specified in any severance plan or policy that
NATCO presently has in effect or that NATCO may establish for employees of
NATCO.

     12. REPRESENTATION AND WARRANTY.

     The Executive hereby represents and warrants that the execution and
performance of this Employment Agreement will not result in or constitute a
default, breach or violation, or an event which, with notice or lapse of time or
both, would be a default, breach or violation, of any understanding, agreement
or commitment, written or oral, express or implied, to which the Executive is a
party or by which the Executive or his property is bound.

     13.  RIGHTS AND WAIVERS.

     All rights and remedies of the parties hereto are separate and cumulative,
and no one of them, whether exercised or not, shall be deemed to be to the
exclusion of any other rights or remedies or shall be deemed to limit or
prejudice any other legal or equitable rights or remedies under this Employment
Agreement unless such waiver is in writing and signed by such party. No delay or
omission on the part of either party in exercising any right or remedy shall
operate as a waiver of such right or remedy or any other rights or remedies. A
waiver on any one occasion shall not be construed as a bar to or waiver of any
right or remedy on any future occasion.

     14. SUCCESSORS.

     (a) NATCO and the Executive agree that if a Change in Control of NATCO
occurs during the Period of Active Employment, the Executive shall, at the time
of the Change in Control of NATCO, be permitted to terminate his employment with
NATCO under this Employment Agreement and receive from NATCO (1) all Base Salary
amounts earned but not yet paid to the Executive through the date of the
Executive's termination; (2) all Bonus Compensation payable to the Executive, if
any, pursuant to Section 5 herein, pro rated accordingly; and (3) severance pay
equal to 18 months base compensation. In the event that the Executive terminates
his employment with NATCO as provided for in this Section 14, NATCO's
obligations and responsibilities to the Executive under this Employment
Agreement are limited to those stated in Sections 14(a)(1), 14(a)(2) and
14(a)(3) above.

                                      -7-
<PAGE>   8
          (b)  For purposes of this Section 14, a "Change in Control of NATCO"
shall mean any acquisition by any Unrelated Party of eighty percent (80%) or
more of the common stock of NATCO issued and outstanding immediately prior to
such acquisition and/or securities of NATCO which may be converted into shares
of common stock of NATCO, computing such percentage as if such securities
acquired had been converted and are issued and outstanding for the purpose of
determining such percentage (a series of acquisitions by an "Unrelated Party"
shall be treated as a single acquisition to the extent the aggregate number of
shares and/or securities referred to above acquired in such series exceeds
eighty percent (80%)). "Unrelated Party" shall mean any party or group of
parties acting together, excluding, however, the Executive, Capricorn
Investors, L.P., Capricorn Investors II, L.P., and Cummings Point Industries,
Inc.

          15.  NON-ASSIGNABILITY OF EXECUTIVE'S DUTIES.

          This Employment Agreement is personal to the Executive and, with the
exception of the Executive's rights to compensation and benefits hereunder,
which may be transferred by will or operation of law, this Agreement shall not,
without the prior written consent of the Board, be assignable by the Executive.

          16.  SAVINGS CLAUSE.

          If any provision of this Employment Agreement or the application
hereof is held invalid, the invalidity shall not affect other provisions or
application of this Employment Agreement that can be given effect without the
invalid provisions or application, and to this end the provisions of this
Employment Agreement are declared to be severable.

          17.  CONSTRUCTION.

          Each party has cooperated in the drafting and preparation of this
Employment Agreement. Hence, in any construction to be made of this Employment
Agreement, the same shall not be construed against any party on the basis of
that party being the "drafter."

          18.  ENTIRE AGREEMENT.

          This Employment Agreement supersedes all prior agreements between the
parties concerning the subject matter hereof and this Employment Agreement
constitutes the entire Employment Agreement between the parties with respect
thereto. This Employment Agreement may be modified only with a written
instrument duly executed by each of the parties. No person has any authority to
make any representations or promises on behalf of any of the parties not set
forth herein and this Employment Agreement has not been executed in reliance
upon any representation or promise except those contained herein.

          19.  SECTION HEADINGS.

          The section headings and captions of this Employment Agreement are
for reference purposes only, are not part of the provisions hereof and shall
not effect in any way the meaning or interpretation of this Employment
Agreement.

                                      -8-
<PAGE>   9
          20.  GOVERNING LAW.

          This Employment Agreement shall be governed by and construed in
accordance with the laws of the State of New York, without reference to
principles of conflict of laws.

          21.  ARBITRATION.

          Any dispute between the parties to this Employment Agreement relating
to or in respect of this Employment Agreement, its negotiation, execution,
performance, subject matter, or any course of conduct or dealing or actions
under or in respect of this Employment Agreement, shall be submitted to, and
resolved exclusively by arbitration in accordance with the Commercial
Arbitration Rules of the American Arbitration Association ("AAA"). Such
arbitration shall take place in New York, New York. Arbitration shall be
commenced by filing a demand for arbitration with the AAA within sixty (60)
days after such dispute has arisen. The prevailing party in such an arbitration
proceeding shall be entitled to recover reasonable attorneys' fees, all
reasonable out-of-pocket costs and disbursements, as well as any and all
charges that may be made for the cost of the arbitration and the fees of the
arbitrators.

          22.  ENFORCEMENT OF ARBITRATION AWARD.

          In the event of litigation to enforce an arbitration award in
connection with or concerning the subject matter of this Employment Agreement,
the prevailing party shall be entitled to recover all reasonable costs and
expenses incurred by such party in connection therewith, including reasonable
attorneys' fees.

          23.  NOTICE

          All notices and other communications hereunder shall be in writing
and shall be given by hand delivery to the other party or by registered or
certified mail, return receipt requested, postage prepaid, addressed as follows:

          If to the Executive, to him at:

          Nathaniel A. Gregory
          Frost Road
          Greenwich, Connecticut 06830

          If to NATCO, to it at:

          Natco Holdings Incorporated
          Brookhollow Central III
          2950 North Loop West, Suite 750
          Houston, Texas 77092
          Attention: Chief Financial Officer

                                      -9-

<PAGE>   10
          With a copy to:

          Vinson & Elkins (to be provided)

or to such other address as either party shall have furnished to the other in
writing in accordance herewith. Notices and communications hereunder shall be
effective when actually received by the addressee.

          24.  LEGAL COUNSEL.

          In entering into this Employment Agreement, the parties represent
that they have relied upon the advice of their attorneys, who are attorneys of
their own choice, and that the terms of this Employment Agreement have been
completely read and explained to them by their attorneys, and that those terms
are fully understood and voluntarily accepted by them.

          In witness whereof, the parties hereto have executed this Agreement
as of the date first above written.


On behalf of
CUMMINGS POINT INDUSTRIES          NATHANIEL A. GREGORY



By /s/ HERBERT S. WINOKUR, JR.     /s/ NATHANIEL A. GREGORY
  ----------------------------     --------------------------


Title:
       -----------------------




                                      -10-
<PAGE>   11
                              EMPLOYMENT AGREEMENT

                                  AMENDMENT 1

         THIS AMENDMENT is to that certain Employment Agreement, dated the 31st
day of July 1997, by and between NATCO Group Inc. f/k/a Cummings Point
Industries ("NATCO") and Nathaniel A. Gregory ("Executive"). NATCO and
Executive may individually be referred to as "party" and collectively referred
to as "parties".

         1. Section 5(e) is deleted in its entirety.

         2. A new Section 5(g) shall be included in the Employment Agreement,
as follows:

            (g) Within fourteen days of execution of this Amendment, NATCO shall
                loan the Executive $1,205,489.92 with full recourse and with
                interest accruing at an annual rate of 6%. The proceeds from the
                loan shall be used by the Executive, to purchase 136,832 shares
                of NATCO stock ("Shares"). Payment of the principal balance and
                all accrued interest shall be due (i) seven years from the date
                of the loan, (ii) upon successful sale of NATCO, or (iii) after
                a successful initial public offering (or sale of NATCO where the
                consideration received is stock of the acquiring party),
                whichever occurs first. Notwithstanding the foregoing, in the
                event (iii) occurs and the Shares (or shares of stock received
                in exchange for the Shares in a sale of NATCO) are deemed
                "restricted securities" within the meaning of Rule 144 of the
                Securities Act of 1933 or are subject to "lock-up" provisions
                with underwriters of an initial public offering, the Executive
                shall not be required to repay that portion of the loan equal to
                the estimated local, state, federal, and FICA taxes due on the
                bonus referred to in Section 3(h) below, until the expiration of
                both impediments. For purposes of this Section 5, a successful
                sale will have occurred in the event of a sale, merger,
                reorganization, or other transaction involving NATCO that
                results in a Change of Control as defined in Section 14(b), and
                in which stockholders of Cummings Point Industries shall receive
                any combination of cash, debt, preferred stock, common stock of
                any unaffiliated party, or similar securities in exchange for no
                less than 50% of Cummings Point Industries' common stock
                ownership in NATCO as of the date of this agreement. For
                purposes of this Section 5, an initial public offering will have
                occurred upon a registration and public offering under the
                Securities Act of common shares of NATCO as contemplated in the
                Stockholder's Agreement attached to the Employment Agreement as
                Exhibit B.

         3. A new Section 5(h) shall be included in the Employment Agreement,
as follows:



<PAGE>   12


         (h)   In the event of a successful sale or an initial public offering
               of NATCO, NATCO shall pay the executive a bonus (in addition to
               any other bonuses to which the Executive might be eligible under
               Section 5 of the Employment Agreement) equal to the outstanding
               balance (principal and accrued interest) of the loan described in
               Section 5(g) above.

     4.  A new Section 5(i) shall be included in the Employment Agreement, as
  follows:

         (i)   Any bonus that the Executive is entitled to under this Section 5
               shall be paid in cash to the Executive coterminous with or as
               soon as practicable after the closing of a successful sale of
               NATCO or a successful initial public offering, but in any event
               no later than ninety days after the successful closing of either
               event.

     5.  All other terms and conditions of the Employment Agreement remain in
  full force and effect without change.

     In witness whereof, the parties have executed this Agreement as of the 12th
  day of July 1999.


  NATCO                                 Gregory

  /s/ HERBERT S. WINOKUR, JR.           /s/ NATHANIEL A. GREGORY
  ---------------------------           --------------------------
      Herbert S. Winokur, Jr.               Nathaniel A. Gregory

<PAGE>   1
                                                                   EXHIBIT 10.13

                                   EXHIBIT A

                             STOCK OPTION AGREEMENT

     THIS STOCK OPTION AGREEMENT AND ANY SHARES ACQUIRED UPON THE EXERCISE OF
THE OPTIONS GRANTED HEREUNDER HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND MAY NOT BE OFFERED FOR
SALE, TRANSFERRED, SOLD, ASSIGNED, PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED
OF IN THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION THEREFROM UNDER SUCH ACT
AND ANY APPLICABLE STATE SECURITIES LAWS.

     THIS STOCK OPTION AGREEMENT, dated as of this 31st day of July, 1997, by
and between Cummings Point Industries, a corporation existing under the laws of
the State of Delaware (hereinafter referred to as "NATCO") and Nathaniel A.
Gregory (hereinafter referred to as "the Executive").

                              W I T N E S S E T H
                              -------------------

     WHEREAS, the Executive and a subsidiary of NATCO entered into an
employment agreement dated March 15, 1994, as amended on the 31st day of July,
1996 (the "Previous Employment Agreement"), under which the Executive has
agreed to employment by such subsidiary under certain terms and conditions, and
under which the Executive is entitled to certain compensation, including
various provisions for special bonus compensation, under certain terms and
conditions;

     WHEREAS, the Executive and NATCO wish to update, clarify, and amend the
Previous Employment Agreement, primarily to substitute employment by NATCO in
place of existing employment by a subsidiary, to specify terms and conditions
for such employment and for Executive's compensation, including various
provisions for special bonus compensation, and to further modify other
provisions as necessary;

     WHEREAS, the Executive and NATCO are therefore simultaneously herewith
entering into an Employment Agreement (the "Employment Agreement") which
supersedes the Previous Employment Agreement;

     WHEREAS, the Executive and NATCO entered into a stock option agreement
dated March 15, 1994, as amended on the 31st day of July, 1996 (the "Previous
Stock Option Agreement"), under which the Executive received options to
purchase shares of common stock in a subsidiary of NATCO under certain terms
and conditions;

     WHEREAS, the Executive and NATCO wish to update, clarify and amend the
Previous Stock Option Agreement, primarily to substitute options to purchase
shares of common stock in NATCO in place of existing options to purchase
subsidiary stock, to specify terms and conditions for such options and to
further modify other provisions as necessary;

     and WHEREAS, in order to provide the Executive with an incentive to
devote his best skills and efforts to the success of NATCO, NATCO deems it to
be in its best interests to provide the Executive with Options to purchase
shares of NATCO;

                                       1

<PAGE>   2
     NOW, THEREFORE, in consideration of the representations, warranties,
covenants and conditions herein and in the Employment Agreement contained, the
parties hereto hereby agree as follows:

     1.   Options.

     (a)  Subject to the terms and upon the conditions contained herein, the
Executive shall have the right, privilege, and option to purchase 416,666 shares
of common stock of NATCO at a purchase price of $1.96 per share (the "First
Option"). The Executive may partially exercise the First Option.

     (b)  Subject to the terms and upon the conditions contained herein, the
Executive shall have the additional right, privilege, and option to purchase
138,889 shares of common stock of NATCO at a purchase price of $4.77 per share
(the "Second Option"). The Executive may partially exercise the Second Option.

     (c)  Subject to the terms and upon the conditions contained herein, the
Executive shall have the additional right, privilege, and option to purchase
123,272 shares of common stock of NATCO at a purchase price of $6.71 per share
(the "Third Option"). The Executive may partially exercise the Third Option.

     (d)  If, at any time during the Period of Active Employment, capital is
raised by NATCO through the offer and sale of Equity Securities to an
Unaffiliated Party, the Executive shall have the option to purchase Equity
Securities of the type being offered and sold equivalent to an additional five
(5) percent of the aggregate amount of Equity Securities being sold to
Unaffiliated Parties other than the Executive at a purchase price equal to the
purchase price at which such Equity Securities are sold (the "Fourth Option",
and together with the First, Second and Third Option, the "Options"). For
purposes of this Section 1(d), an "Unaffiliated Party" is any person other than
Capricorn Investors, L.P., or Capricorn Investors II, L.P., or any of their
affiliates, and "Equity Securities" shall mean any stock or similar security or
any security convertible, with or without consideration, into such security, or
carrying any warrant, option or right to subscribe for or purchase such a
security, or any such warrant, option or right. The Executive may exercise this
option in whole or in part.


     (e)  If subsequent to the date of this Agreement the Company shall declare
and pay any stock dividend or shall divide or combine the outstanding Common
Stock through any stock split, stock combination or other recapitalization, the
number of shares and purchase price for shares under the Options shall be
appropriately adjusted to reflect such stock dividend, stock split, stock
combination or other recapitalization.

     (f)  If the Company shall at any time issue (i) shares of common stock
(other than common stock issued to the Company's employees and directors
pursuant to stock option agreements), (ii) rights or warrants to subscribe for
or purchase shares of common stock (other than options issued to the Company's
employees and directors) or other securities of the Company convertible into or
exchangeable for shares of common stock ("Convertible Securities"), or (iii)
Convertible Securities, in each case at a purchase, exercise or conversion price
per share (taking into account, in cases (ii) and (iii), any consideration
received by the Company for such rights, warrants or Convertible Securities, the
value of such consideration, if


                                       2

<PAGE>   3
other than cash, to be determined in good faith by the Board of Directors) less
than the fair value or average market price per share of the common stock on
the applicable record date (in cases where the issuance is to all shareholders)
or issuance date (in other cases), then in each such case, the number of shares
thereafter issuable upon exercise of the Options after such record or issuance
date, as the case may be, shall be determined by multiplying the number of
shares issuable upon exercise of the Options on the date immediately preceding
such record or issuance date, as the case may be, by a fraction, the numerator
of which shall be the sum of the number of shares of common stock outstanding
on such record or issuance date and the number of additional shares of common
stock so offered for subscription or purchase in connection with such rights or
warrants or issuable upon conversion of such Convertible Securities, and the
denominator of which shall be the sum of the number of shares of common stock
outstanding on such record or issuance date and the number of shares of common
stock which the aggregate offering price of the total number of shares so
offered or so issuable would purchase at such average market price; provided,
however, if all the shares of common stock offered in cases (i), (ii) or (iii),
as the case may be, are not delivered (whether upon their offering, the
exercise of such rights or warrants or the conversion of such Convertible
Securities) upon the termination of the offering or the expiration of such
rights or warrants or the conversion option of such Convertible Securities, as
the case may be, the number of shares issuable upon exercise of the Options
shall thereafter be readjusted to the number of shares which would have been in
effect had the numerator and the denominator of the foregoing fraction and the
resulting adjustment been made based upon the number of shares of common stock
actually delivered rather than upon the number of shares of common stock
offered for subscription or purchase or issuable upon conversion. Such
adjustment shall be made whenever common stock or any such rights, warrants or
Convertible Securities are issued to all holders of the common stock, and shall
become effective, as the case may be, on the date of issuance or retroactive to
the record date for determination of shareholders entitled to receive the
common stock or such warrants, rights or Convertible Securities.

    2.    TIME OF EXERCISE OPTIONS.

    Subject to the terms and upon the conditions contained herein, the Options
may be exercised at any time prior to the earlier to occur of termination of the
Options pursuant to Section 5 hereof and (i) seven (7) years from the 31st day
of July 1996 in the case of the First and Second Options, (ii) seven (7) years
from the 31st day of July 1997 in the case of the Third Option, or (iii) seven
(7) years from the date on which Equity Securities are sold in the case of the
Fourth Option (the "Option Period").

    3.    METHOD OF EXERCISE.

    (a)   The Options may be exercised only within the Option Period and
only (1) by notice in writing of the Executive's exercise of the Options,
delivered to the Chief Financial Officer of NATCO or mailed by registered or
certified mail, return receipt requested, postage pre-paid, addressed to the
Chief Financial Officer of NATCO, c/o National Tank Company, Brookhollow Central
III, Suite 750, 2950 North Loop West, Houston, Texas 77092, and (2) by
contemporaneous payment to NATCO of the full amount of the purchase price of the
common stock being purchased by the Executive pursuant to these Options
(together with any amount which is necessary to satisfy any applicable federal,
state or local tax requirements), by certified check or official bank check
payable to the order of NATCO.


                                       3
<PAGE>   4
     (b)  NATCO may require of the Executive at the time the Options are
exercised, that the Executive make or enter into representations and agreements
as may be necessary or desirable, in the opinion of NATCO, in order to assure
compliance with the terms of this Stock Option Agreement and all applicable
federal and state securities laws and stock exchange regulations.

     (c)  NATCO shall make immediate delivery of all shares purchased by the
Executive upon the exercise of the Option, provided that if any law or
regulation requires NATCO to take any action with respect to the shares being
purchased by the Executive pursuant to these Options, then the date of delivery
of such shares shall be extended for the period necessary to take such action.

     4.   STOCKHOLDERS AGREEMENT.

     In the event the Executive exercises the Options and purchases shares of
common stock of NATCO, the Executive shall be subject to the terms of the
Stockholders Agreement dated the 30th day of June, 1997, by and among Capricorn
Investors, L.P., Capricorn Investors II, L.P. and Cummings Point Industries,
Inc., attached hereto as Exhibit B.

     5.   TERMINATION OF OPTIONS.

     (a)  The Options, to the extent not heretofore exercised, shall terminate
and cease to be exercisable on the date on which the first of the following
events occurs:

          (l)  one year after the termination of the Executive's employment with
     NATCO pursuant to Section 1(e)(l) or Section 1(e)(2) of the Employment
     Agreement;

          (2)  the termination of the Executive's employment with NATCO pursuant
     to Section 11(a) of the Employment Agreement;

          (3)  the sale of all of the common stock of NATCO to any party or
     parties other than the Executive, regardless of whether such sale is
     effected in a single transaction or a series of related or unrelated
     transactions and provided that NATCO gives the Executive written notice at
     least 30 days prior to any transaction that would result in the termination
     of the Executive's Options pursuant to this Section 5(a)(3); or

          (4)  expiration of the Option Period as provided in Section 2 of this
     Stock Option Agreement.

     6.   NON-TRANSFERABILITY OF OPTIONS.

     The Options may not be sold, hypothecated, transferred or otherwise
disposed of, and may only be exercised by the Executive, or his estate
provided that the estate exercises such Options within two years of the
Executive's death. If the Executive's estate exercises the Options, the estate
shall be bound by all conditions, restrictions, and limitations that otherwise
would have applied to the Executive had the Executive exercised the Options.





                                       4
<PAGE>   5
     7.   NO RIGHTS AS STOCKHOLDER.

     The Executive shall have none of the rights of a stockholder of NATCO with
respect to any of the shares of common stock issuable under the Options unless
and until such shares of common stock have been purchased by the Executive in
accordance with the terms and conditions of this Stock Option Agreement.

     8.   REPRESENTATION AS TO INVESTMENT.

     The Executive represents and warrants to NATCO that all shares purchased
under this Stock Option Agreement shall be acquired for the Executive's own
account and not with a view to distribution. The Executive acknowledges that the
Executive may not sell, assign, transfer or otherwise dispose of any shares
purchased under this Stock Option Agreement, or of any of his right, title or
interest therein, in the absence of either a registration statement under the
Securities Act of 1933, as amended (the "Act") or an exemption from the
registration provisions of the Act, and agrees that certificates representing
the shares may contain a legend to such effect. The exercise of these Options
and the delivery of shares hereunder is contingent upon NATCO being furnished by
the Executive with a statement in writing at the time of such exercise
confirming the accuracy of the foregoing representation and warranty.

     9.        NOTICE.

     All notices and other communications hereunder shall be in writing and
shall be given by hand delivery to the other party or by registered or certified
mail, return receipt requested, postage prepaid, addressed as follows:

     If to the Executive, to him at:

     Nathaniel A. Gregory
     Frost Road
     Greenwich, Connecticut 06830

     If to NATCO, to it at:
     Cummings Point Industries
     30 East Elm Street
     Greenwich, Connecticut 06830
     Attention: President

     With a copy to:

     O'Melveny & Myers
     Citicorp Center
     153 East 53rd Street
     New York, New York 10022-4611
     Attention: Drake Tempest, Esq.





                                       5
<PAGE>   6
     With a further copy to:

     Vinson & Elkins (to be provided)

or to such other address as either party shall have furnished to the other in
writing in accordance herewith. Notices and communications hereunder (including
without limitation, notice of the Executive's election to purchase the Options)
shall be effective when actually received by the addressee.

     10.  Amendment.

     This Stock Option Agreement may only be modified, supplemented or amended
by a written instrument executed by the party against whom which enforcement of
such modification, supplement or amendment is sought.

     11.  Headings.

     The headings contained herein are for the sole purpose of convenience of
reference, and shall not in any way limit or affect the meaning or
interpretation of any of the terms or provisions of this Stock Option Agreement.

     12.  Governing Law.

     This Stock Option Agreement shall be governed by and construed in
accordance with the laws of the State of New York without reference to
principles of conflict of laws.

     In witness whereof, the parties hereto have executed this Agreement as of
the date first above written.


CUMMINGS POINT INDUSTRIES                  NATHANIEL A. GREGORY

By /s/ Herbert S. Winokur                  /s/ Nathaniel A. Gregory
   ----------------------------            ----------------------------------
Title:
       ------------------------


                                       6
<PAGE>   7
                                 AMENDMENT NO. 1

                                       TO

                             STOCK OPTION AGREEMENT


         This AMENDMENT NO. 1 (this "Amendment") to that certain STOCK OPTION
AGREEMENT (the "Stock Option Agreement") dated as of July 31, 1997 by and
between Cummings Point Industries, Inc. (now NATCO Group Inc.), a Delaware
corporation ("NATCO") and Nathaniel A. Gregory (the "Executive") is itself dated
as of May __, 1998 by and between NATCO and the Executive.

                                    RECITALS:

         As of July 31, 1997, NATCO and the Executive entered into an Employment
Agreement (the "Employment Agreement") that amended and restated a prior
employment agreement between NATCO and the Executive dated as of July 31, 1996.

         In connection with the execution and delivery of the Employment
Agreement, NATCO and the Executive entered into the Stock Option Agreement which
amended and restated a prior stock option agreement between NATCO and the
Executive dated as of July 31, 1996.

         NATCO is currently planning to effect an initial public offering of its
common stock, par value $0.01 per share (the "Common Stock") and NATCO and the
Executive have determined that certain provisions of the Stock Option Agreement,
while appropriate in the context of a privately owned company, are inconsistent
with the Executive's responsibilities as the chief executive officer of a
publicly owned company.

         Accordingly, the Executive is voluntarily agreeing to delete those
provisions from the Stock Option Agreement effective as of the Effective Date
(as hereinafter defined).

         NOW, THEREFORE, the parties hereto, for and in consideration of the
premises, the mutual covenants and agreements hereinafter set forth and other
good and valuable consideration, the receipt and adequacy of which are hereby
acknowledged, agree as follows:

         1. Amendments. Effective as of the Effective Date, the Stock Option
Agreement shall be amended in the following respects:

                  (a) The first sentence of subsection (c) of Section 1 of the
                  Stock Option Agreement is hereby amended so as to be and read,
                  in its entirety, as follows:



<PAGE>   8


                  "Subject to the terms and upon the conditions contained
                  herein, the Executive shall have the additional right,
                  privilege and option to purchase 123,272 shares of common
                  stock of NATCO at a purchase price of $6.71 per share (the
                  "Third Option", and, together with the First and Second
                  Options, the "Options")."

                  (b) Subsection (d) of Section 1 of the Stock Option Agreement
                  is hereby deleted in its entirety from the Stock Option
                  Agreement and such provision shall, from and after the
                  Effective Date, be null and void and of no further force or
                  effect.

         2.       Definitions.

                  (a) "Commission" shall mean the United States Securities and
                  Exchange Commission.

                  (b) "Effective Date" shall mean the effective date, as ordered
                  by the Commission, of that certain Registration Statement on
                  Form S-1 filed by NATCO with the Commission with respect to
                  the offering, sale and delivery of the Common Stock to be sold
                  in the Initial Public Offering.

         3. Confirmation of Other Provisions. The parties hereto confirm that
each provision of the Stock Option Agreement, other than those expressly amended
hereby, is hereby ratified and shall remain in full force and effect.

         4. Headings. The headings contained herein are for the sole purpose of
convenience of reference and shall not in any way limit or affect the meaning or
interpretation of any of the terms or provisions of this Amendment.

         In Witness Whereof, the parties hereto have executed this Amendment as
of the date first above written.

                                      NATCO GROUP INC.
                                      (formerly Cummings Point Industries, Inc.)



                                      By:
                                          --------------------------------------
                                      Name:
                                            ------------------------------------
                                      Title:
                                             -----------------------------------


                                      ------------------------------------------
                                                 Nathaniel A. Gregory

<PAGE>   9


                             STOCK OPTION AGREEMENT

                                  AMENDMENT 1

         THIS AMENDMENT is to that certain Stock Option Agreement, dated the
31st day of July 1997, by and between NATCO Group Inc. f/k/a Cummings Point
Industries ("NATCO") and Nathaniel A. Gregory ("Executive"). NATCO and
Executive may individually be referred to as "party" and collectively referred
to as "parties".

         1. The following language is added as an additional sentence at the
end of Section 1(d) to the Stock Option Agreement:

                  In no event shall the number of options contemplated by this
                  Section 1(d) exceed 25,000 and any unexercised right to
                  these options shall expire on December 31, 1999.

         2. Section 1(f) is deleted in its entirety.

         3. A new section 1(g) shall be included in the Stock Option Agreement,
as follows:

                  (g)      The Executive may put up to 75,000 options upon
                           execution of this Amendment. For each option put by
                           the Executive and purchased by NATCO, NATCO shall
                           issue to the Executive a fully-vested, new option
                           with a strike price of $8.81; in no event, however,
                           shall NATCO issue more than 50,000 new options to
                           the Executive under this Section 1(g).

         4. All other terms and conditions of the Stock Option Agreement remain
in full force and effect without change.



         In witness whereof, the parties have executed this Agreement as of the
12th day of July 1999.

NATCO                                   Gregory

/s/ HERBERT S. WINOKUR, JR.             /s/ NATHANIEL A. GREGORY
- ----------------------------            -----------------------------
Herbert S. Winokur, Jr.                 Nathaniel A. Gregory



<PAGE>   10


                            SINGLE INSTALLMENT NOTE

         In consideration of value received, I, Nathaniel A. Gregory, agree to
pay to NATCO Group Inc. f/k/a Cummings Point Industries the principal amount of
$1,205,489.92 on which interest shall accrue at the annual rate of 6%.

         Payment of the principal balance and all accrued interest shall be due
(i) seven years from July 12, 1999, (ii) upon successful sale of NATCO, or (iii)
after a successful initial public offering (or sale of NATCO where the
consideration received is stock of the acquiring party), whichever occurs
first. Notwithstanding the foregoing, in the event (iii) occurs and any stock
bought with the principal (or shares of stock received in exchange for any
stock bought with the principal in a sale of NATCO) are deemed "restricted
securities" within the meaning of Rule 144 of the Securities Act of 1933 or are
subject to "lock-up" provisions with underwriters of an initial
public offering, Gregory shall not be required to repay that portion of the
loan equal to the estimated local, state, federal, and FICA taxes due on the
bonus referred to in Section 3(h) of Gregory's Employment Agreement
("Agreement"), until the expiration of both impediments. For purposes of this
note, a successful sale will have occurred in the event of a sale, merger,
reorganization, or other transaction involving NATCO that results in a Change
of Control as defined in Section 14(b) of the Agreement, and in which
stockholders of NATCO shall receive any combination of cash, debt, preferred
stock, common stock of any unaffiliated party, or similar securities in
exchange for no less than 50% of the common stock ownership in NATCO as of July
12, 1999. For purposes of this note, an initial public offering will have
occurred upon registration and public offering under the Securities Act of
NATCO common shares as contemplated in the Stockholder's Agreement attached to
the Agreement as Exhibit B.

         Failure to make payment when due shall be considered default. Should
default exist for more than a grace period of sixty days, Gregory agrees to pay
NATCO all reasonable costs and expenses incurred during collection proceedings
including, but not limited to, attorney's fees.


/s/ NATHANIEL A. GREGORY
- ----------------------------
Nathaniel A. Gregory

State of Texas      (
County of Harris    (

         SWORN TO AND SUBSCRIBED TO before me on this the 20th day of July
1999, by Nathaniel A. Gregory, a person known to me.


                              /s/ PATRICIA G. SIMTH
                              -------------------------------------------
                              Notary Public in and for the State of Texas


[SEAL]

<PAGE>   1
                                                                   EXHIBIT 10.19



                             STOCKHOLDERS' AGREEMENT

                  This Stockholders' Agreement (this "Agreement") is made as of
the 18th day of November, 1998 by and among Capricorn Investors, L.P., a
Delaware limited partnership ("Cap I"), Capricorn Investors II, L.P., a Delaware
limited partnership ("Cap II"), NATCO Group Inc., a Delaware corporation
("Natco") and each of the Designated Stockholders (as hereinafter defined).

                                R E C I T A L S:

         Natco is the owner of all the outstanding capital stock of National
Tank Company, a Delaware corporation ("National Tank"), and Natco, through
National Tank, is engaged in the business of designing, fabricating and
servicing oil and gas process equipment and systems.

         On November 18, 1998, the Certificate of Incorporation of Natco was
amended to authorize two classes of common stock, par value $0.01 per share
("Common Stock"), to wit: 45,000,000 shares of Class A Common Stock ("Class A
Common Stock") and 5,000,000 shares of Class B Common Stock ("Class B Common
Stock"), and to convert each of the then outstanding shares of common stock of
Natco into one share of Class A Common Stock (the "Charter Amendment").

         As a result of the Charter Amendment, Cap I and Cap II, as the owners
of record and beneficially of all then outstanding Common Stock, acquired and
now own 5,563,667 shares and 2,582,259 shares of Class A Common Stock,
respectively.

         Natco, National Tank, The Cynara Company, a Delaware corporation
("Cynara"), and Natco Acquisition Company, a Delaware corporation and a wholly
owned subsidiary of Natco ("Newco") are parties to an Amended and Restated
Agreement and Plan of Merger dated November 17, 1998 but effective as of March
26, 1998 (the "Merger Agreement") that, among other things, provides that Cynara
will merge, upon the terms and subject to the conditions of the Merger Agreement
and in accordance with the General Corporation Law of Delaware, with and into
National Tank and National Tank will be the Surviving Corporation (the
"Merger").

         On November 18, 1998, Natco and Cap II consummated the transaction
contemplated by that certain Investment Agreement dated November 17, 1998,
pursuant to which Natco issued and sold, and Cap II purchased, a non-negotiable
promissory note in the principal amount of $5,300,000 for a like amount of cash,
such note being automatically convertible into 504,762 shares of Class A Common
Stock of Natco upon expiration or termination of the waiting period under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended.

         It is a condition to the obligations of Cynara under the Merger
Agreement that Cap I and Cap II and each of the Designated Stockholders shall
have entered into a Stockholders' Agreement substantially similar in form and
substance to this Agreement.



<PAGE>   2




         NOW, THEREFORE, in consideration of the premises, the mutual covenants
hereinafter expressed and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

         1.       Definitions.

                  "Affiliate" shall have the meaning ascribed to such term in
Rule 12b-2 under the Exchange Act.

                  "Agreement", "hereof", "hereunder", and words of similar
import shall refer to this Stockholders' Agreement, as it may be amended from
time to time.

                  "Associate" shall have the meaning ascribed thereto in Rule
405 of the General Rules and Regulations under the Securities Act of 1933, as
amended.

                  "Cap I" shall mean Capricorn Investors, L.P., a Delaware
limited partnership.

                  "Cap II" shall mean Capricorn Investors II, L.P., a Delaware
limited partnership.

                  "Capricorn Registration Rights Agreement" shall mean that
certain Registration Rights Agreement dated as of November 18, 1998 among Natco,
Cap I and Cap II.

                  "Charter Amendment" shall have the meaning ascribed to such
term in the second recital to this Agreement.

                  "Class A Common Stock" shall have the meaning ascribed to such
term in the second recital to this Agreement.

                  "Class B Common Stock" shall have the meaning ascribed to such
term in the second recital to this Agreement.

                  "Code" shall mean the Internal Revenue Code of 1986, as
amended.

                  "Common Stock" shall have the meaning ascribed to such term in
the second recital to this Agreement.

                  "Cynara" shall mean The Cynara Company, a Delaware
corporation.

                  "Designated Stockholder" shall mean each of the holders of
record and beneficially of common stock of Cynara immediately prior to the
effective date of the Merger (assuming the exercise of all outstanding Cynara
warrants).

                  "Drag-Along Notice" shall have the meaning ascribed to such
term in Section 2(f)(i) herein.



<PAGE>   3




                  "Exchange Act" shall mean the Securities Exchange Act of 1934,
as amended.

                  "Merger" shall have the meaning ascribed to such term in the
fourth recital to this Agreement.

                  "Merger Agreement" shall have the meaning ascribed to such
term in the fourth recital to this Agreement.

                  "Natco" shall mean NATCO Group Inc., a Delaware corporation.

                  "National Tank" shall mean National Tank Company, a Delaware
corporation and a wholly owned subsidiary of Natco.

                  "Overallotment Shares" shall have the meaning ascribed to such
term in Section 2(e)(ii) herein.

                  "Person" means and includes natural persons, corporations,
limited partnerships, joint stock companies, joint ventures, associations,
companies, trusts, banks and other organizations, whether or not legal entities,
and governments and agencies and political subdivisions thereof.

                  "Principal Stockholder" shall mean either Cap I or Cap II so
long as it owns of record and beneficially 1% or more of the outstanding Common
Stock.

                  "Public Sale" shall mean a Sale of Common Stock pursuant to an
effective registration statement under the Securities Act.

                  "Purchase Offer" shall have the meaning ascribed to such term
in Section 2(f) herein.

                  "Purchaser" shall have the meaning ascribed to such term in
Section 2(f) herein.

                  "Remaining Stockholders" shall have the meaning ascribed to
such term in Section 2(f)(i) herein.

                  "Sale" shall mean any offer, offer to sell, offer for sale,
sale, assignment, contract of sale, disposition of an interest in or transfer,
grant of a participation in, pledge or other disposal of any Common Stock (or
any solicitation of any offers to buy or otherwise acquire, or take a pledge of,
any Common Stock).

                  "Sale Notice" shall have the meaning ascribed to such term in
Section 2(e)(i) herein.

                  "Securities Act" shall mean the Securities Act of 1933, as
amended.

                  "Selling Principal Stockholder" shall have the meaning
ascribed to such term in Section 2(f) herein.



<PAGE>   4




                  "Stockholder" shall mean, for so long as such Person owns of
record any shares of Common Stock, Cap I, Cap II, each Designated Stockholder
and any assignee thereof (or any other Person who shall acquire and hold of
record shares of Common Stock) who shall have agreed to be bound by the terms of
this Agreement.

         2.       Restrictions on Certain Sales.

                  (a) General Restrictions. The provisions of this Agreement,
including this Section 2, apply to all the holdings of Common Stock of each
Stockholder, whether held on the date of this Agreement or hereafter acquired,
including without limitation the shares of Class A Common Stock to be acquired
by Cap II upon conversion of the promissory note issued by Natco pursuant to the
Investment Agreement. Each Stockholder agrees that it will not, directly or
indirectly, effect a Sale of any Common Stock, except in compliance with the
Securities Act and this Agreement. No Stockholder shall effect a Sale other than
a Sale to Natco or another Stockholder, or a Public Sale, unless the Stockholder
first obtains a written opinion of counsel (which opinion and counsel, who may
be counsel for Natco, shall be reasonably satisfactory to Natco), to the effect
that the proposed Sale is exempt from registration under the Securities Act and
all applicable state securities laws.

                  (b) Legend. Each certificate evidencing outstanding Common
Stock issued to any Stockholder shall bear a legend in substantially the
following form:

                  THE OFFERING, SALE AND DELIVERY OF THE SHARES REPRESENTED BY
                  THIS CERTIFICATE WERE NOT REGISTERED UNDER THE SECURITIES ACT
                  OF 1933, AS AMENDED, AND THUS NEITHER SUCH SHARES NOR ANY
                  INTEREST THEREIN MAY BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED,
                  HYPOTHECATED OR OTHERWISE DISPOSED OF UNLESS SUCH TRANSACTION
                  IS REGISTERED UNDER THAT ACT OR AN OPINION OF COUNSEL
                  SATISFACTORY TO THE COMPANY IS PROVIDED TO THE COMPANY PRIOR
                  TO THE PROPOSED TRANSACTION THAT REGISTRATION UNDER SUCH ACT
                  IS NOT REQUIRED. THE SHARES REPRESENTED BY THIS CERTIFICATE
                  ARE SUBJECT TO THE PROVISIONS OF A STOCKHOLDERS AGREEMENT
                  DATED AS OF NOVEMBER 18, 1998, AS THE SAME MAY BE AMENDED (A
                  COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY),
                  AND MAY NOT BE TRANSFERRED, SOLD, ASSIGNED, PLEDGED OR
                  HYPOTHECATED UNLESS SUCH TRANSFER, SALE OR HYPOTHECATION
                  COMPLIES WITH THE TERMS OF SUCH AGREEMENT.

                  (c) Distributions of Common Stock. Each of Cap I and Cap II
may distribute, whether in liquidation or otherwise, all or part of the Common
Stock owned by it to any of its general or limited partners if each such general
or limited partner agrees in writing in connection


<PAGE>   5



with such distribution to be bound by all of the provisions of this Agreement
applicable by their terms to a Stockholder (other than a Principal Stockholder).

                  (d) Specific Restrictions. Each Stockholder further agrees
that it will not effect any Sale, other than a Sale to Natco or another
Stockholder, a Public Sale or a Sale to a Purchaser pursuant to Section 2(f)
herein, unless the Person to whom such Sale is made shall have agreed in writing
to be bound by all of the provisions of this Agreement applicable by their terms
to a Stockholder (other than a Principal Stockholder). Any such transferee shall
have all the rights and benefits, and be subject to all the obligations, of this
Agreement applicable by its terms to a Stockholder. Any purported Sale that
would contravene the provisions of this Section 2(d) shall be null and void.

                  (e) Right of First Refusal. Each Stockholder, other than
either Principal Stockholder, agrees not to effect a Sale, other than a Sale
permitted by clause (iv) of this subsection 2(e), unless, in any such case,
prior to such Sale:

                           (i) Such Stockholder shall have given to Natco and to
         each Principal Stockholder that then holds Common Stock written notice
         (a "Sale Notice") of such Stockholder's intention to effect the Sale.
         The Sale Notice shall include (x) the number of shares of Common Stock
         that the Stockholder proposing the Sale desires to sell, (y) the
         principal terms of the Sale, including the price at which such shares
         of Common Stock are intended to be sold and such other information with
         respect to such Sale as Natco or either Principal Stockholder shall
         reasonably request in writing and (z) an offer to sell to Natco or
         either Principal Stockholder, on terms and conditions substantially
         identical to those contained in the Sale Notice, a number of shares of
         Common Stock determined in accordance with Section 2(e)(ii) hereof.

                           (ii) (A) Natco shall first have the right to purchase
         any number of shares of Common Stock up to the aggregate number of such
         shares of Common Stock that the selling Stockholder intends to sell in
         the Sale, and Natco shall promptly, but in any event within 10 days
         after receipt of the Sale Notice, advise the Selling Stockholder and
         each Principal Stockholder in writing of its determination in that
         regard.

                                (B) Each Principal Stockholder shall then have
         the right to purchase a number of shares of Common Stock included in
         the Sale equal to (x) the total number of shares of Common Stock
         included in the Sale less (y) the number of shares of Common Stock
         purchased by Natco pursuant to clause (A) above which result shall be
         (z) multiplied by a fraction, the numerator of which is the aggregate
         number of shares of Common Stock then held by such Principal
         Stockholder and the denominator of which is the aggregate number of
         shares of Common Stock then held by the Principal Stockholders who
         accept the offer made in the Sale Notice. If either Principal
         Stockholder under this clause (B) elects to purchase fewer than the
         maximum number of shares of Common Stock to which such Principal
         Stockholder is entitled pursuant to the preceding sentence, the other
         Principal Stockholder shall then be entitled to purchase the remaining
         number of shares of Common Stock (the "Overallotment Shares") to be
         included in the Sale. Each Principal Stockholder


<PAGE>   6




         shall advise the other, if any, in writing promptly, but in any event
         within 15 days after receipt of the Sale Notice, as to any
         Overallotment Shares available to the other for purchase.

                           (iii) Within 20 days after receiving the Sale Notice,
         each Principal Stockholder desiring to accept the offer made therein
         shall so notify the selling Stockholder in writing, specifying the
         maximum number of shares of Common Stock that such Principal
         Stockholder wishes to purchase. If Natco or either Principal
         Stockholder does not, within the appropriate time period specified in
         subsection (e)(ii) or (e)(iii), so signify its intention to participate
         in the Sale, Natco or such Principal Stockholder as the case may be
         shall be deemed to have waived all of its rights under this Section
         2(e) with respect to such Sale. If the aggregate of the number of
         shares of Common Stock that Natco and the Principal Stockholders have
         agreed to purchase pursuant to the allocation provisions of paragraph
         (ii) of this Section 2(e) shall be less than the number of shares of
         Common Stock included in the Sale Notice, Natco and the Principal
         Stockholders shall be deemed to have waived their rights under this
         Section 2(e) with respect to such Sale. If Natco and each Principal
         Stockholder waive their rights with respect to such Sale, the selling
         Stockholder shall thereafter be free, for a period of 90 days, to
         consummate such Sale for the number of shares of Common Stock set forth
         in the Sale Notice at a price not less than the price set forth in the
         Sale Notice and on terms otherwise no more favorable to the purchasers
         than as set forth therein.

                           (iv) Anything to the contrary herein notwithstanding,
         the provisions of this subsection (e) shall not apply to a Sale to
         Natco or another Stockholder, a Public Sale or a Sale to a Purchaser
         pursuant to subsection 2(f) herein. In addition, the provisions of this
         subsection (e) shall not apply to (A), subject to compliance with the
         provisions of subsection 2(d) herein, a Sale by any Stockholder to any
         Affiliate of such Stockholder or (B), subject to compliance with the
         provisions of subsection 2(c) herein, to a distribution, whether in
         liquidation or otherwise, by Cap I or Cap II to the limited and general
         partners thereof or (C), subject to compliance with the provisions of
         subsection 2(d) herein, in the case of a Stockholder who is an
         individual, to any transfer by operation of law, by death pursuant to a
         will or the laws of descent and distribution, by transfer to a member
         of the immediate family of such Stockholder or a trust for the benefit
         of any such family member or by transfer to a commercial bank or other
         lending institution in accordance with the terms of a bona fide pledge
         (including without limitation a pledge of Common Stock by Winokur (as
         such term is defined in the Capricorn Registration Rights Agreement)
         contemplated by Section 4 of the Capricorn Registration Rights
         Agreement) or (D), subject to compliance with the provisions of
         subsection 2(d) herein, in the case of a Stockholder that is a legal
         entity, by such entity to a successor of such entity or to the
         purchaser of all or substantially all of that entity's assets, each of
         which exceptions described in clauses (C) and (D) shall be permitted if
         the transferor or transferee shall give notice of such assignment,
         together with such information as may be reasonably necessary to
         evidence qualification of the transferee to be an assignee thereof, to
         Natco.

                  (f) Rights to Compel Sale or to Offer Opportunity to Sell;
Drag-Along Rights; Tag-Along Rights. If a Principal Stockholder owning at least
10% of the outstanding Common


<PAGE>   7


Stock (the "Selling Principal Stockholder") proposes to effect a Sale of all
shares of Common Stock held by it to a third party that is not an Affiliate or
Associate of Natco or either Principal Stockholder (the "Purchaser") for cash,
cash equivalents or readily marketable securities (the "Purchase Offer"), such
Selling Principal Stockholder shall consult with the other Principal
Stockholder, if any, and, after any such consultation, either (x), if the other
Principal Stockholder, if any, has agreed to sell all its shares of Common Stock
to the Purchaser on the same terms and conditions, require each and every other
Stockholder to sell or (y), if the other Principal Stockholder, if any, has not
agreed to sell all its shares of Common Stock to the Purchaser on the same terms
and conditions, offer each and every other Stockholder, including the other
Principal Stockholder, if any, the opportunity to sell, any and all shares of
Common Stock held by such Stockholders to the Purchaser, in each case, for the
same consideration per share and otherwise on the same terms and conditions upon
which the Selling Principal Stockholder proposes to sell its shares. If, at the
time a Selling Principal Stockholder proposes to effect a Sale pursuant to this
subsection (f), there is no other Principal Stockholder, the Selling Principal
Stockholder may, at its option, proceed in accordance with clause (x) or (y) of
this subsection (f).

                           (i) Exercise of Right. The Selling Principal
         Stockholder shall cause the Purchase Offer to be reduced to writing and
         shall provide a written notice (the "Drag-Along Notice") in which it
         complies with the provisions of clauses (x) or (y) of this subsection
         (f) to each other Stockholder, including the other Principal
         Stockholder, if any (the other Stockholders, excluding the other
         Principal Stockholder, if any, being herein called the "Remaining
         Stockholders"). The Drag-Along Notice shall include information
         concerning the nature and amount of the consideration per share to be
         paid by the Purchaser and the other terms and conditions of the
         Purchase Offer. Any Sale pursuant to clause (x) of this subsection 2(f)
         shall entail all the outstanding shares of Common Stock owned by the
         Selling Principal Stockholder and the other Principal Stockholder, if
         any, and the Remaining Stockholders, but any Sale pursuant to clause
         (y) of this subsection 2(f) shall entail only those shares of Common
         Stock owned by the Selling Principal Stockholder and those owned by the
         Remaining Stockholders and the other Principal Stockholder, if any, to
         the extent that such Remaining Stockholders and the other Principal
         Stockholder, if any, have elected to participate in such Sale. No later
         than five business days before the closing date of the Sale set forth
         in either the Drag-Along Notice or in a subsequent notice from the
         Selling Principal Stockholder, each other Stockholder participating in
         the Sale pursuant to the provisions of clause (x) or (y) of this
         subsection (f) (a "Participating Stockholder") shall deliver to a
         representative of the Selling Principal Stockholder designated in the
         Drag-Along Notice or such subsequent notice certificates representing
         all the shares of Common Stock held by such Participating Stockholder
         to be sold in such Sale, duly endorsed in blank for transfer, with
         signatures guaranteed, together with all other documents required to be
         executed in connection with such Purchase Offer or, if such delivery is
         not permitted by applicable law, an unconditional agreement to deliver
         such shares of Common Stock pursuant to this subsection (f) at the
         closing of such Sale against delivery to such Participating Stockholder
         of the consideration therefor. If any Participating Stockholder shall
         fail to deliver such certificates to the Selling Principal Stockholder,
         Natco shall cause its books and records to show that such shares of
         Common Stock are bound by the provisions of this subsection (f)




<PAGE>   8

         and that such shares of Common Stock shall be transferred only to the
         Purchaser upon surrender thereof for transfer by the Participating
         Stockholder.

                           (ii) Return of Stock. If, for any reason the Selling
         Principal Stockholder determines that it cannot complete the sale of
         all the shares of Common Stock, the Selling Principal Stockholder shall
         return to each Participating Stockholder all certificates representing
         shares of Common Stock that such Participating Stockholder delivered
         for sale pursuant hereto, together with all other documents delivered
         pursuant hereto by such Participating Stockholder, and all the
         restrictions on sale or other disposition contained in this Agreement
         with respect to such shares of Common Stock shall continue in effect.

                           (iii) Remittance of Consideration. At the closing of
         the sale of all shares of Common Stock pursuant to this subsection
         2(f), the consideration with respect to the shares of Common Stock of
         any Participating Stockholders sold pursuant hereto shall be paid
         directly to each such Participating Stockholder pursuant to written
         instructions of such Participating Stockholder. The Selling Principal
         Stockholder shall furnish such other evidence of the completion and
         time of completion of such Sale and the terms thereof as may be
         reasonably requested by such Participating Stockholders.

                           (iv) No Liability. Notwithstanding anything contained
         in this subsection 2(f), there shall be no liability on the part of the
         Selling Principal Stockholder to any Participating Stockholder if the
         Sale of shares of Common Stock pursuant to this subsection 2(f) is not
         consummated for whatever reason and, in such circumstances, the Selling
         Principal Stockholder's only obligation shall be to return the shares
         of Common Stock and other documents to the Participating Stockholders
         as contemplated by clause (ii) of this subsection 2(f). Whether to
         effect a sale of shares of Common Stock pursuant to this subsection
         2(f) shall be in the sole and absolute discretion of the Selling
         Principal Stockholder.

                           (v) Costs. All costs and expenses incurred by any
         seller in connection with a Sale pursuant to this subsection 2(f),
         including without limitation all attorneys' fees, costs and
         disbursements and any finders' fees or brokerage commissions, shall be
         allocated pro rata among the sellers, with each bearing that portion of
         such costs and expenses equal to a fraction, the numerator of which
         shall be the amount of the gross proceeds received by such seller from
         such Sale, and the denominator of which shall be the total amount of
         the gross proceeds received by all sellers from such Sale.

                  (g) Inapplicability and Termination of Certain Provisions. The
provisions contained in subsections (c), (d), (e) and (f) of this Section 2,
including without limitation all restrictions on the ability of any Stockholder
to effect a Sale as set forth in subsection (d) or (e) of this Section 2, shall
be inapplicable to the sale of Class A Common Stock or Common Stock by Natco and
any Stockholder in the initial public offering thereof and shall terminate and
be of no further force or effect at such time as Natco is required to file
reports pursuant to Section 13 or Section 15(d) of the Exchange Act.



<PAGE>   9




         3.       Related Party Transactions. So long as either Principal
Stockholder continues to own more than 10% of the outstanding Common Stock and
except as contemplated hereby or as the other Stockholders shall consent thereto
in writing, such Principal Stockholder shall not engage in any financial
transaction with Natco unless each other Stockholder has been offered the right
to participate in such transaction proportionately in accordance with such
Stockholder's ownership of Common Stock; provided, however, that this Section 3
shall not apply to the conversion of the Promissory Note (as such term is
defined in that certain Investment Agreement dated as of November 17, 1998
between Natco and Capricorn Investors II, L.P.).

         4.       Specific Performance.

                  The parties hereto each acknowledge and agree that, in the
event of any breach of this Agreement, each non-breaching party would be
irreparably harmed and could not be made whole by monetary damages. It is
accordingly agreed that such parties, in addition to any other remedy to which
they may be entitled at law or in equity, shall be entitled to compel specific
performance of this Agreement in any action instituted in the United States
District Court for the Southern District of New York, or, in the event such
court would not have jurisdiction for such action, in any court of the United
States or any state having subject matter jurisdiction. The parties hereto each
consent to personal jurisdiction in any such action brought in the United States
District Court for the Southern District of New York.

         5.       Entire Agreement; Amendments.

                  This Agreement supercedes all prior agreements and
understandings among the parties with respect to its subject matter, including
without limitation that certain Stockholders' Agreement dated as of June 30,
1997 among Cummings Point Industries, Inc., a Delaware corporation (now NATCO
Group, Inc.), Cap I and Cap II which is hereby terminated and rendered of no
further force or effect. This Agreement contains the entire understanding of the
parties with respect to the subject matter of this Agreement. There are no
restrictions, agreements, promises, warranties, covenants, or undertakings other
than those expressly set forth herein or therein. This Agreement may not be
amended except by an instrument in writing signed on behalf of all of the
parties hereto. Any agreement on the part of a party hereto to any extension or
waiver shall be valid only if set forth in an instrument in writing signed on
behalf of such party.

         6.       Interpretation.

                  The section and paragraph headings contained in this Agreement
are for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Whenever reference is made herein to specific
numbers of shares of stock (as opposed to percentages, proportions and like
ratable computations) such numbers shall, in the event of any stock split, stock
dividend, reclassification or similar event, be appropriately adjusted to
reflect the impact of such event upon such number of shares.




<PAGE>   10



         7.       Notice.

                  All notices and other communications hereunder shall be in
writing and shall be given by hand delivery to the other party or by registered
or certified mail, return receipt requested, postage prepaid, or by facsimile
copy, receipt of which has been acknowledged, addressed as follows:

                  To Natco:          NATCO Group Inc.
                                     Brookhollow Central III
                                     2950 North Loop West
                                     Houston, Texas 77092
                                     Attention:  Nathaniel A. Gregory
                                                 Chairman of the Board and
                                                 Chief Executive Officer
                                     Telecopy No.:  713/683-7841

                  To Cap I:          Capricorn Investors, L.P.
                                     c/o Winokur Holdings, Inc.
                                     30 East Elm Street
                                     Greenwich, Connecticut 06830
                                     Attention:  Herbert S. Winokur, Jr.
                                                 President
                                     Telecopy No.:  203/861-6671

                  To Cap II:         Capricorn Investors II, L.P.
                                     c/o Capricorn Holdings, LLC
                                     30 East Elm Street
                                     Greenwich, Connecticut 06830
                                     Attention:  Herbert S. Winokur, Jr.
                                                 Manager
                                     Telecopy No.:  203/861-6671

                  To the Designated  c/o George K. Hickox, Jr.
                      Stockholders:  Heller, Hickox, Dimeling, Schreiber & Park
                                     1629 Locust Street
                                     Philadelphia, Pennsylvania 19103
                                     Telecopier No.:  215/546-1041

or to such other address as either party shall have furnished to the other in
writing in accordance herewith. Notices and communications hereunder shall be
effective when actually received by the addressee.

         8.       Termination.

                  This Agreement shall terminate in its entirety on the earlier
of the tenth anniversary of the date hereof and the date on which less than
fifty percent (50%) of the outstanding Common Stock shall be held of record, in
the aggregate, by Cap I, Cap II, each Person who is as of the date of this
Agreement or prior to the liquidation and dissolution, if any, of Cap I or Cap
II, was a general


<PAGE>   11




or limited partner of Cap I and Cap II, the Designated Stockholders, Nathaniel
A. Gregory and their affiliates.

         9.       Governing Law.

                  This Agreement shall be governed by and construed in all
respects in accordance with the laws of the State of New York, without regard to
the principles of conflicts of laws thereof which might refer such
interpretation to the laws of a different state or jurisdiction.

         10.      Counterparts.

                  This Agreement may be executed simultaneously in one or more
counterparts, any of which may have been transmitted and received by facsimile
transmission and each of which shall be deemed to be an original but all of
which together shall constitute one and the same instrument.



             (The remainder of this page intentionally left blank.)





<PAGE>   12




                  IN WITNESS WHEREOF, this Agreement has been duly executed and
delivered as of the date first above written.


                                     NATCO GROUP INC.

                                     By:   /s/ NATHANIEL A. GREGORY
                                        ---------------------------------------
                                     Name:  Nathaniel A. Gregory
                                          -------------------------------------
                                     Title:  Chairman of the Board and Chief
                                           ------------------------------------
                                             Executive Officer
                                           ------------------------------------

                                     CAPRICORN INVESTORS, L.P.

                                     By:      Capricorn Holdings, G.P.,
                                              its general partner

                                     By:      Winokur Holdings, Inc.,
                                              its general partner

                                     By:      /s/ HERBERT S. WINOKUR, JR.
                                              ---------------------------------
                                              Herbert S. Winokur, Jr.
                                              President

                                     CAPRICORN INVESTORS II, L.P.

                                     By:      Capricorn Holdings, LLC,
                                              its general partner

                                     By:      /s/ HERBERT S. WINOKUR, JR.
                                              ---------------------------------
                                              Herbert S. Winokur, Jr.
                                              Manager

                                     DESIGNATED STOCKHOLDERS

                                     /s/ WILLIAM R. DIMELING
                                     ------------------------------------------
                                     William R. Dimeling

                                     /s/ ROBERT J. HAMAKER
                                     ------------------------------------------
                                     Robert J. Hamaker

                                     /s/ DOUGLAS P. HELLER
                                     ------------------------------------------
                                     Douglas P. Heller





<PAGE>   13




                                     /s/ GEORGE K. HICKOX, JR.
                                     ------------------------------------------
                                     George K. Hickox, Jr.

                                     /s/ RALPH M. KELLY
                                     ------------------------------------------
                                     Ralph M. Kelly

                                     /s/ STEVEN G. PARK
                                     ------------------------------------------
                                     Steven G. Park

                                     /s/ RICHARD R. SCHREIBER
                                     ------------------------------------------
                                     Richard R. Schreiber

                                     /s/ JOHN C. TUTEN, JR.
                                     ------------------------------------------
                                     John C. Tuten, Jr.


                                     THE 1998 TRUST FOR JODY SMITH HAMAKER


                                     By: /s/ JODY SMITH HAMAKER
                                        ---------------------------------------
                                     Name:  Jody Smith Hamaker
                                     Title:  Trustee


                                     BOCP II, L.L.C.


                                     By: /s/ EARLE J. BENSING
                                        ---------------------------------------
                                     Name:  Earle J. Bensing
                                     Title:    Authorized Signer





<PAGE>   1
[NATCOGROUP LETTERHEAD]                               Interoffice Correspondence

- --------------------------------------------------------------------------------

TO:      William E. Joor III (V&E-Houston               DATE: September 28, 1999

FROM:    Daniel R. Carter
         Chief Legal Officer and Secretary

SUBJECT: Change in Control Policy

- --------------------------------------------------------------------------------

        At a special meeting of the NATCO Group Inc. Board of Directors held
Monday, September 27, 1999, the subject item was discussed and resolutely
approved, as follows:

        The listed senior executive office positions of NATCO Group Inc. and its
        subsidiaries are participants in NGI's change of control policy:

        President of NGI
        Chief Financial Officer & Senior Vice President of NGI
        Senior Vice President - Technology & Product Development of NGI
        Senior Vice President - Marketing of NGI
        President of NATCO U.S.
        President of NATCO Canada, Limited
        President of Total Engineering Services Team, Inc.
        President of Cynara

        In the event of a change of control of NGI, NGI will pay the holder of
        the listed senior executive office 150% of base annual salary (200% in
        the sole case of the President of NGI) plus all accrued bonuses
        calculated on a pro rata basis to the score defined in the Management
        Bonus Program.

        A change of control means the acquisition of 50% or more of (i) NGI's
        outstanding common stock, (ii) any securities that may be converted to
        NGI common stock, or (iii) the assets of NGI by a party unrelated to
        Capricorn I or Capricorn II. A change of control will not be deemed to
        have occurred, if any surviving corporation in the case of merger or any
        purchasing corporation in the case of a sale of all of NGI's assets
        agrees to employ the holder of the listed senior executive office on
        terms substantially similar to the terms of office in force immediately
        prior to the change of control.

        The resolution regarding the change of control policy will be included
in the minutes of the meeting, when finalized, and the minutes will reflect that
the following vote was recorded:

                         Allan               Yes
                         Bull                Yes
                         Gregory             Yes
                         Hickox              Yes
                         McCarthy            Abstained
                         Staley              Yes
                         Winokur             Absent

     IN WITNESS WHEREOF, I subscribe my name and on this 28th day of September
1999.


                                                 /s/ DANIEL R. CARTER
                                                 ---------------------
                                                     Daniel R. Carter

<PAGE>   1
                                                                   EXHIBIT 10.21

                                                               [NATCOGROUP LOGO]
                                                          HUMAN RESOURCES MANUAL

Policy No: II-4                          Issued: June 1999 (R)
                                         Supercedes July 1997 (R)
Subject:   Severance Pay
           Summary Plan Description      Effective:   January 1, 1987

Page No:   1 of 8                        Approved by: /s/ PATRICK M. McCARTHY
                                                      Name:  Patrick M. McCarthy
                                                      Title: President

- --------------------------------------------------------------------------------

1.0  PURPOSE

     To provide severance benefits to certain employees of the NATCO Group's
     domestic locations that involuntarily loses their positions with the
     Company under severance qualifying conditions.

2.0  ELIGIBILITY

     An employee may be eligible for benefits under the Company's Severance Pay
     Plan (Plan) if he or she is:

     a. Employed at one of the Company's domestic (U.S.) facilities; and

     b. A regular full-time employee; and

     c. His or her employment is involuntarily terminated; and

     d. His or her termination of employment is due to a change in operations, a
        facility relocation or closing, or a reduction for other economic
        reasons, and the employee does not refuse or otherwise fail to accept
        another position that may be available with the facility/Company; or

     e. His or her termination of employment is the result of a sale or merger
        of all or part of the Company's business or assets, merger acquisition
        or other form of corporate reorganization and the employee is not
        offered a position by the acquiring or resulting company.

     f. If an employee resigns, abandons his or her job, fails to return from an
        approved leave of absence, initiates termination on any similar basis,
        or does not satisfy the criteria set forth in sections 2a-2d of this
        policy, the employee will be ineligible for severance pay. In addition,
        employees will be ineligible for benefits if they are terminated for
        misconduct, unsatisfactory performance, or otherwise for cause which
        shall be determined solely at the Company's discretion.
<PAGE>   2
                                                               [NATCOGROUP LOGO]
                                                          HUMAN RESOURCES MANUAL

Policy II-4

Severance

Page 2 of 8

        To be eligible for benefits under this Plan, employees may be required
        to sign a waiver and release agreement in a form prepared by the
        Company at the time of termination.

3.0  Schedule of Benefits

     The amount of the benefits an employee receives will depend on the
     employee's length of service as determined by their most recent hire
     (anniversary) date as shown in the Schedule of Severance Payment in Section
     3.5 of this policy.

     Benefits will be based on the base salary, exclusive of overtime, shift
     differentials, bonus, commissions, etc. of the employee at the time of
     termination notification. Any performance or merit reviews that are pending
     or in process shall not affect the amount of any employee's severance
     benefits.

     In addition, the benefits paid under this plan shall be inclusive of any
     termination notice pay an employee may be eligible to receive under the
     federal Workers Adjustment Retraining and Notification Act or any
     applicable state or local plant closing laws.

     3.1  Regular Full-Time Employees

          All regular full-time employees who have completed a minimum of six
          (6) months employment from their most recent date of hire
          (anniversary) will be entitled to compensation as defined by the
          Schedule of Severance Payments with a maximum of sixteen (16) weeks.

          If the Company rehires an employee, his or her initial service time
          will not be counted in computation of severance if the employee is
          subsequently terminated again.

     3.2  Part-Time and Temporary Employees

          No severance payments will be granted to regular part-time or
          temporary employees.

     3.3  Executive and Senior Managers

          Benefits will be granted as determined by the Chief Executive Officer,
          Group President and or Board of Directors.




<PAGE>   3


                                                               [NATCOGROUP LOGO]


Policy II-4

Severance

Page 3 of 8

       3.4     Benefit Offset

               An employees benefits under this plan may be reduced, at the
               discretion of the Plan Administrator, by any amounts the
               employee may owe the Company (e.g. salary advances, vacation
               advances, unreconciled expenses, etc.)

       3.5     Schedule of Severance Payments

<TABLE>
<CAPTION>
================================================================================
YEARS OF SERVICE    FORMULA FACTOR(FF)   YEARS OF SERVICE    FORMULA FACTOR(FF)
================================================================================
<S>                 <C>                  <C>                 <C>
    30 Years               16.00             14 Years               10.50
- --------------------------------------------------------------------------------
    29 Years               16.00             13 Years                9.75
- --------------------------------------------------------------------------------
    28 Years               16.00             12 Years                9.00
- --------------------------------------------------------------------------------
    27 Years               16.00             11 Years                8.25
- --------------------------------------------------------------------------------
    26 Years               16.00             10 Years                7.50
- --------------------------------------------------------------------------------
    25 Years               16.00              9 Years                6.75
- --------------------------------------------------------------------------------
    24 Years               16.00              8 Years                6.00
- --------------------------------------------------------------------------------
    23 Years               16.00              7 Years                5.25
- --------------------------------------------------------------------------------
    22 Years               16.00              6 Years                4.50
- --------------------------------------------------------------------------------
    21 Years               15.75              5 Years                3.75
- --------------------------------------------------------------------------------
    20 Years               15.00              4 Years                3.00
- --------------------------------------------------------------------------------
    19 Years               14.25              3 Years                2.25
- --------------------------------------------------------------------------------
    18 Years               13.50              2 Years                1.50
- --------------------------------------------------------------------------------
    17 Years               12.75              1 Years                1.00
- --------------------------------------------------------------------------------
    16 Years               12.00         6 mos to 1 Year             1.00
- --------------------------------------------------------------------------------
    15 Years               11.25         Less than 6 mos             -0-
================================================================================
</TABLE>
<PAGE>   4
                                                               [NATCOGROUP LOGO]
                                                          HUMAN RESOURCES MANUAL


Policy II-4

Severance

Page 4 of 8

4.0      VACATION PAYMENT

         Employees entitled to vacation will be compensated under the terms of
         Vacation Policy IV-1.

5.0      NOTICE PAY

         As much notice of termination as is consistent with business conditions
         will be provided to each terminating employee.

         Employee's will be entitled to up to week's notice or pay in lieu of
         notice as appropriate and determined by business conditions and the
         Plan Administrator.

6.0      METHOD OF PAYMENT

         The Company will make the determination as to how benefits will be paid
         in its sole discretion. Employees will receive their benefits in either
         one lump sum payment or in installments coincident with the Company's
         current payroll cycle concluding with the month following, the month in
         which the termination transpired. Employees enrolled in the Company's
         various benefit plans will be entitled to coverage as described within
         each Plan's document. Medical coverage may be continued through the
         month following the month in which termination transpired, with
         deductions made from either the lump sum or payroll cycle.

         This period of group health insurance continuation will be applied
         against an employee's entitlements under the Consolidated Omnibus
         Budget Reconciliation Act (COBRA). (Corporate Benefits may be contacted
         for details.)

7.0      SOURCE OF BENEFITS

         The Company will pay all benefits under this Plan from its general
         assets.

8.0      REVIEW OF DENIAL OF BENEFITS

         In the event an employee does not receive benefits to which he or she
         believes he or she is entitled, the employee may file a claim, in
         writing, for those benefits. If the claim is denied, in whole or in
         part, the employee will be notified in writing. The notice will
         indicate why the claim was denied and either describe any additional
         information necessary to grant a claim or instruct the employee on how
         to appeal the denial. To appeal, an employee must file a form
         prescribed by the Company






<PAGE>   5
                                                               [NATCOGROUP LOGO]
                                                          HUMAN RESOURCES MANUAL


Policy II-4

Severance

Page 5 of 8

         setting forth the facts and benefits claimed. The administration of the
         Plan will rule on all such claims within 60 days of receipt of any
         appeal. A copy of the ruling and a statement supporting the decision
         will be provided the employee.

9.0      AMENDMENT OR TERMINATION OF THE PLAN

         The Company reserves the right to amend or terminate the Plan at any
         time in its sole discretion, with or without advance notice.

10.0     YOUR RIGHTS UNDER ERISA

         As a participant in this Plan, and employee is entitled to certain
         rights and protection under the Employee Retirement Income Security Act
         of 1974 (ERISA). ERISA provides that all Plan participants shall be
         entitled to:

         a. Examine, free of charge, at the administrative office in their
            geographic area, all Plan documents and copies of all documents
            filed by the Plan with the U.S. Department of Labor.

         b. Obtain copies of all Plan documents and other Plan information upon
            written request to the plan administrator. The administrator of the
            Plan may make a reasonable charge for the copies.

         In addition to creating rights for Plan participants, ERISA imposes
         obligations upon the individuals responsible for the operation of the
         Plan. The people who operate the Plan, called "fiduciaries" of the
         Plan, have a duty to do so prudently and in the interest of all Plan
         participants and beneficiaries.

         No one, including the Company or any other person, may discriminate
         against employees to prevent them from obtaining a benefit or from
         exercising their rights under ERISA. If a claim for a benefit is denied
         in whole or in part, an employee must receive a written explanation of
         the reason for the denial. Employees also have the right to have the
         administrator of the Plan review and reconsider any claim. Under ERISA,
         there are steps employees can take to enforce their ERISA-protected
         rights. For instance, if a participant in the Pan requests materials
         from the administrator of the Plan and does not receive them within 30
         days, the participant may file suit in a federal court. In such a case,
         the court may require the administrator of the Plan to provide the
         materials and pay up to $100 a day until the participant receives the
         materials, unless the materials were not sent because of reasons beyond
         the control of the administrator of the Plan. If a claim
<PAGE>   6

                                                               [NATCOGROUP LOGO]
                                                          Human Resources Manual


Policy II-4

Severance

Page 6 of 8

         for benefits is denied or ignored, in whole or in part, the
         participant may file suit in a state or federal court.

         If any employee is discriminated against for asserting his or her
         rights, assistance may be sought from the U.S. Department of Labor, or
         the participant may file suit in a federal court. The court will decide
         who shall pay court costs and legal fees. If the Plan participant is
         successful, the court may order the person sued to pay these costs and
         fees. If the participant loses, the court may order him or her to pay
         these costs and fees, for example, if it finds a claim is frivolous.

         If a participant has any questions about the Plan, he or she should
         contact Human Resources. If a participant has any questions about this
         statement or about his or her rights under ERISA, the nearest area
         office of the Labor-Management Services Administration, U.S.
         Department of Labor should be contacted.

11.0     General Information

         11.1   The Plan is sponsored by the NATCO Group, 2950 North Loop West,
                Ste. 700, Houston, TX 77092 (713) 683-9292.

         11.2   Plan Administrator

                The vice president of Human Resources is the administrator of
                the Plan who is appointed by the president of the Company. The
                administrator of the Plan makes the rules and regulations
                necessary to administer the Plan. The administrator of the Plan
                shall have the responsibility and discretionary authority to
                interpret the terms of this Plan, to determine eligibility for
                benefits, and to determine the amount of such benefits. The
                interpretations and determinations of the administrator of the
                Plan shall be final and binding, unless determined by a court
                of competent jurisdiction to be arbitrary and capricious.

         11.3   Type of Plan

                The Plan is a severance pay Plan.
<PAGE>   7

                                                               [NATCOGROUP LOGO]
                                                          HUMAN RESOURCES MANUAL

Policy II-4

Severance

Page 7 of 8


     11.4 Agent for Legal Process

          The NATCO Group's Chief Legal Officer, is the agent for service of
          legal process. Any communications should be sent to:

                  Chief Legal Officer
                  The NATCO Group
                  2950 N. Loop West
                  Ste. 700
                  Houston, Texas 77092

          Legal process may also be served on the administration of the Plan at:

                  Vice President Human Resources
                  Severance Plan Administration
                  The NATCO Group
                  2950 N. Loop West
                  Suite 700
                  Houston, Texas 77092


     11.5 Plan Year

          The records of the Plan are kept on a calendar year basis.

     11.6 Identification Number

          Employees who have a need to discuss the Plan with a federal
          government agency, may need the following numbers:

                  Plan Number 501
                  Employer ID# 22-2906892

12.0 TERMINATION OF POLICY

     The company believes wholeheartedly in the plan, policies and procedures
     described herein, and considers them conditions of employment. NATCO Group
     Inc. reserves the right to modify, revoke, suspend, terminate or change any
     or all such plans, policies or procedures, in whole or in part, at any time
     with or without notice.
<PAGE>   8

                                                               [NATCOGROUP LOGO]
                                                          HUMAN RESOURCES MANUAL


Policy II-4

Severance

Page 8 of 8


13.0 RIGHTS RESERVED

     All rights reserved, this policy has been prepared for the exclusive use of
     NATCO Group Inc. No part of this document may be reproduced in any form by
     any means without the prior written consent of NGI.



<PAGE>   1
                                                                  EXHIBIT 10.22

                                 LOAN AGREEMENT

                   ($22,000,000 U.S. REVOLVING LOAN FACILITY,

                  $10,000,000 CANADIAN REVOLVING LOAN FACILITY

                                      AND

                        $32,500,000 TERM LOAN FACILITY)

                         DATED AS OF NOVEMBER 20, 1998

                                     AMONG

                             NATIONAL TANK COMPANY,
                               AS U.S. BORROWER,

                              NATCO CANADA, LTD.,
                             AS CANADIAN BORROWER,

                   CHASE BANK OF TEXAS, NATIONAL ASSOCIATION,
                      AS U.S. AGENT AND AS A U.S. LENDER,

                            THE BANK OF NOVA SCOTIA,
                   AS CANADIAN AGENT AND AS A CANADIAN LENDER

                                      AND

                       THE OTHER LENDERS NOW OR HEREAFTER
                                 PARTIES HERETO

                                AND JOINED IN BY

                                NATCO GROUP INC.


<PAGE>   2

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----

<S>                                                                                                           <C>
1.       Definitions..............................................................................................1
         1.1        Certain Defined Terms.........................................................................1
         1.2        Miscellaneous................................................................................30

2.       Commitments; Loans; BA's and Letters of Credit..........................................................30
         2.1        Loans and BA's...............................................................................30
         2.2        Letters of Credit............................................................................31
         2.3        Certain Provisions Relating to Bankers' Acceptances..........................................36
         2.4        Terminations, Reductions or Reallocations of  Commitments....................................39
         2.5        Commitment Fees..............................................................................40
         2.6        Several Obligations..........................................................................41
         2.7        Notes........................................................................................41
         2.8        Use of Proceeds..............................................................................42
         2.9        Currency Fluctuations........................................................................42

3.       Borrowings, Prepayments and Interest Options............................................................43
         3.1        Borrowings...................................................................................43
         3.2        Prepayments..................................................................................43
         3.3        Interest Options.............................................................................46

4.       Payments; Pro Rata Treatment; Computations, Etc.........................................................51
         4.1        Payments.....................................................................................51
         4.2        Pro Rata Treatment...........................................................................53
         4.3        Certain Actions, Notices, Etc................................................................53
         4.4        Non-Receipt of Funds by Any Agent............................................................54
         4.5        Sharing of Payments, Etc.....................................................................55

5.       Conditions Precedent....................................................................................55
         5.1        Initial Loans, Letters of Credit and Bankers' Acceptances....................................55
         5.2        All Loans, Letters of Credit and Bankers' Acceptances........................................58

6.       Representations and Warranties..........................................................................58
         6.1        Organization.................................................................................58
         6.2        Financial Statements.........................................................................58
         6.3        Enforceable Obligations; Authorization.......................................................59
         6.4        Other Debt...................................................................................59
         6.5        Litigation...................................................................................59
         6.6        Title........................................................................................60
</TABLE>



<PAGE>   3


<TABLE>
<S>                                                                                                             <C>
         6.7        Taxes........................................................................................60
         6.8        Regulations U and X..........................................................................60
         6.9        Subsidiaries.................................................................................60
         6.10       No Untrue or Misleading Statements...........................................................60
         6.11       ERISA........................................................................................60
         6.12       Investment Company Act.......................................................................60
         6.13       Public Utility Holding Company Act...........................................................60
         6.14       Solvency.....................................................................................61
         6.15       Fiscal Year..................................................................................61
         6.16       Compliance...................................................................................61
         6.17       Environmental Matters........................................................................61
         6.18       Collateral Covered...........................................................................61

7.       Affirmative Covenants...................................................................................62
         7.1        Taxes, Existence, Regulations, Property, Etc.................................................62
         7.2        Financial Statements and Information.........................................................62
         7.3        Financial Tests..............................................................................63
         7.4        Inspection...................................................................................64
         7.5        Further Assurances...........................................................................64
         7.6        Books and Records............................................................................64
         7.7        Insurance....................................................................................64
         7.8        Notice of Certain Matters....................................................................64
         7.9        Capital Adequacy.............................................................................65
         7.10       ERISA Information and Compliance.............................................................66
         7.11       Additional Security Documents................................................................66
         7.12       Year 2000....................................................................................67

8.       Negative Covenants......................................................................................67
         8.1        Borrowed Money Indebtedness..................................................................67
         8.2        Liens........................................................................................68
         8.3        Contingent Liabilities.......................................................................68
         8.4        Mergers, Consolidations and Dispositions of Assets...........................................68
         8.5        Redemption, Dividends and Distributions......................................................69
         8.6        Nature of Business...........................................................................70
         8.7        Transactions with Related Parties............................................................70
         8.8        Loans and Investments........................................................................70
         8.9        Subsidiaries.................................................................................70
         8.10       Key Agreements...............................................................................71
         8.11       Organizational Documents.....................................................................71
         8.12       Unfunded Liabilities.........................................................................71
         8.13       Operating Lease Expenses.....................................................................71
         8.14       Sale/Leasebacks..............................................................................71
</TABLE>


                                       ii

<PAGE>   4

<TABLE>
<S>                                                                                                             <C>
         8.15       Subordinated Indebtedness....................................................................71
         8.16       Acquisitions.................................................................................71
         8.17       Negative Pledges.............................................................................71

9.       Defaults................................................................................................72
         9.1        Events of Default............................................................................72
         9.2        Right of Setoff..............................................................................75
         9.3        Collateral Account...........................................................................75
         9.4        Preservation of Security for Letter of Credit Liabilities....................................76
         9.5        Currency Conversion After Maturity...........................................................76
         9.6        Remedies Cumulative..........................................................................77

10.      Agents..................................................................................................77
         10.1       Appointment, Powers and Immunities...........................................................77
         10.2       Reliance.....................................................................................78
         10.3       Defaults.....................................................................................78
         10.4       Material Written Notices.....................................................................79
         10.5       Rights as a Lender...........................................................................79
         10.6       Indemnification..............................................................................79
         10.7       Non-Reliance on Agents and Other Lenders.....................................................80
         10.8       Failure to Act...............................................................................80
         10.9       Resignation or Removal of Agent..............................................................80
         10.10      No Partnership...............................................................................81
         10.11      Authority of Agent...........................................................................81

11.      Miscellaneous...........................................................................................81
         11.1       Waiver.......................................................................................81
         11.2       Notices......................................................................................82
         11.3       Expenses, Etc................................................................................82
         11.4       Indemnification..............................................................................83
         11.5       Amendments, Etc..............................................................................83
         11.6       Successors and Assigns.......................................................................84
         11.7       Limitation of Interest.......................................................................87
         11.8       Survival.....................................................................................88
         11.9       Captions.....................................................................................88
         11.10      Counterparts.................................................................................88
         11.11      Governing Law................................................................................88
         11.12      Severability.................................................................................88
         11.13      Tax Forms; Net Payments......................................................................88
         11.14      Interest Act (Canada)........................................................................89
         11.15      Judgment Currency............................................................................89
         11.16      Conflicts Between This Agreement and the Other Loan Documents................................89
</TABLE>


                                      iii

<PAGE>   5

<TABLE>
<S>                                                                                                             <C>
         11.17      Limitation on Charges; Substitute Lenders; Non-Discrimination................................89
         11.18      Confidentiality..............................................................................90
         11.19      Amendment and Restatement....................................................................90
</TABLE>


EXHIBITS

         A-1  -- Request for Extension of Credit (U.S. Borrower)
         A-2  -- Request for Extension of Credit (Canadian Borrower)
         B  -- Rate Designation Notice
         C  -- Canadian Revolving Note
         D  -- U.S. Revolving Note
         E  -- Assignment and Acceptance
         F  -- Compliance Certificate
         G  -- Bankers' Acceptance Notice
         H  -- Canadian Dollar Revolving Note
         I  -- Borrowing Base Certificate
         J  -- Term Note
         K  -- Permitted Sales
         L  -- Subsidiaries



                                       iv

<PAGE>   6

                                 LOAN AGREEMENT


         THIS LOAN AGREEMENT is made and entered into as of November 20, 1998
(the "Effective Date"), by and among NATIONAL TANK COMPANY, a Delaware
corporation (the "U.S. Borrower"); NATCO CANADA, LTD., a corporation formed
under the laws of the Province of Ontario (the "Canadian Borrower"); each of
the lenders which is or may from time to time become a party hereto
(individually, a "Lender" and, collectively, the "Lenders", which terms shall
include U.S. Lenders and Canadian Lenders); CHASE BANK OF TEXAS, NATIONAL
ASSOCIATION ("Chase Texas"), a national banking association, as agent for the
U.S. Lenders (in such capacity, together with its successors in such capacity,
the "U.S. Agent"), and THE BANK OF NOVA SCOTIA ("BNS"), as agent for the
Canadian Lenders (in such capacity, together with its successors in such
capacity, the "Canadian Agent").

         The parties hereto agree as follows:

1.       Definitions.

         1.1 Certain Defined Terms.

         In this Agreement, terms defined above shall have the meanings
ascribed to them above. Unless a particular term, word or phrase is otherwise
defined or the context otherwise requires, capitalized terms, words and phrases
used herein or in the Loan Documents (as hereinafter defined) have the
following meanings (all definitions that are defined in this Agreement or in
the Loan Documents in the singular have the same meanings when used in the
plural and vice versa):

         Acceptance Fee means the fee payable in Canadian Dollars to each
Canadian Lender in respect of the Bankers' Acceptances accepted by such
Canadian Lender computed in accordance with Section 2.3(c).

         Accounts, Equipment, General Intangibles and Inventory shall have the
respective meanings assigned to them in the Uniform Commercial Code enacted in
the State of Texas as Sections 1 through 11 of the Texas Business and Commerce
Code, in force on the Effective Date.

         Additional Collateral shall have the meaning ascribed to such term in
Section 7.8 hereof.

         Additional Collateral Event shall have the meaning ascribed to such
term in Section 7.8 hereof.

         Additional Interest means the aggregate of all amounts accrued or paid
pursuant to the Notes or any of the other Loan Documents (other than interest
on the Notes at the Stated Rate and any Acceptance Fee) which, under applicable
laws, are or may be deemed to constitute interest on the indebtedness evidenced
by the Notes or any other amounts owing under any Loan Document.



<PAGE>   7

         Adjusted LIBOR means, with respect to each Interest Period applicable
to a LIBOR Borrowing, a rate per annum equal to the quotient, expressed as a
percentage, of (a) LIBOR with respect to such Interest Period divided by (b)
1.0000 minus the Eurodollar Reserve Requirement in effect on the first day of
such Interest Period.

         Affiliate means any Person controlling, controlled by or under common
control with any other Person. For purposes of this definition, "control"
(including "controlled by" and "under common control with") means the
possession, directly or indirectly, of the power to direct or cause the
direction of the management and policies of such Person, whether through the
ownership of voting securities or otherwise.

         Agents means U.S. Agent and Canadian Agent, collectively.

         Agreement means this Loan Agreement, as it may from time to time be
amended, modified, restated or supplemented.

         Annual Financial Statements means the annual financial statements of a
Person, including all notes thereto, which statements shall include a balance
sheet as of the end of the fiscal year relating thereto and an income statement
and a statement of cash flows for such fiscal year, all setting forth in
comparative form the corresponding figures from the previous fiscal year, all
prepared in conformity with GAAP in all material respects, and accompanied by
the opinion of independent certified public accountants of recognized national
standing, which shall state that such financial statements present fairly in
all material respects the financial position of such Person and, if such Person
has any Subsidiaries, its consolidated Subsidiaries as of the date thereof and
the results of its operations for the period covered thereby in conformity with
GAAP. As to Borrowers only, Annual Financial Statements shall also include
unaudited consolidating financial statements for the applicable Borrower and
unaudited consolidated financial statements for the applicable Borrower and its
Subsidiaries, each in Proper Form, certified in each case by the chief
financial officer or other authorized officer of the applicable Borrower as
presenting fairly in all material respects the consolidating or consolidated,
as the case may be, financial position of the applicable Person. Annual
Financial Statements for Canadian Borrower may be adjusted to conform with
generally accepted Canadian accounting principles, consistently applied.

         Applicable BA Discount Rate means, as applicable to a Bankers'
Acceptance being purchased by any Canadian Lender on any day, the percentage
discount rate (expressed to two decimal places and rounded upward, if
necessary, to the nearest 1/100th of 1%) quoted by the Canadian Agent as that
at which the Canadian Agent would, in accordance with normal practice, at or
about 12:00 noon (Toronto, Ontario time), on such day, be prepared to purchase
Bankers' Acceptances in an amount and having a maturity date comparable to the
amount and maturity date of such Bankers' Acceptances.

         Applicable Canadian Pension Legislation means, at any time, any
federal or provincial pension legislation then applicable to the Canadian
Borrower, including the Employment Pension


                                       2

<PAGE>   8
Plans Act (Alberta), the Pension Benefits Act (Ontario) and the Income Tax Act
(Canada), including all regulations made thereunder, and all rules,
regulations, rulings and interpretations made or issued by any Governmental
Authority having or asserting jurisdiction in respect thereof.

         Applications means all applications and agreements for Letters of
Credit, or similar instruments or agreements, in Proper Form, now or hereafter
executed by any Person in connection with any Letter of Credit now or hereafter
issued or to be issued under the terms hereof at the request of any Person.

         Assignment and Acceptance shall have the meaning ascribed to such term
in Section 11.6(b).

         Availability Period means, for each Lender, the period from and
including the Effective Date to (but not including) the Termination Date.

         BA Discount Proceeds means in respect of any Bankers' Acceptance being
purchased by a Canadian Lender on any day under Section 2.3, an amount (rounded
to the nearest whole Canadian cent, and with one-half of one Canadian cent
being rounded up) calculated on such day by multiplying:

         (A)      the face amount of such Bankers' Acceptance; by

         (B)      the quotient equal to one divided by the sum of one plus the
                  product of:

                  (i)      the Applicable BA Discount Rate (expressed as a
                           decimal) applicable to such Bankers' Acceptance; and

                  (ii)     a fraction, the numerator of which is the number of
                           days remaining in the term of such Bankers'
                           Acceptance and the denominator of which is 365;

                  with such quotient being rounded up or down to the nearest
                  fifth decimal place and .000005 being rounded up.

         Bankers' Acceptance or BA means a bill of exchange denominated in
Canadian Dollars drawn by the Canadian Borrower on and accepted by a Canadian
Lender pursuant to Section 2.3 hereof.

         Bankers' Acceptance Liabilities means, at any time and in respect of
any Bankers' Acceptance, the face amount thereof if still outstanding and
unpaid or, following maturity and payment thereof, the aggregate unpaid amount
of all Reimbursement Obligations at that time due and payable in respect of the
payment of such Bankers' Acceptance upon maturity.

         Bankers' Acceptance Notice has the meaning specified in Section
2.3(a).


                                       3

<PAGE>   9

         Bankruptcy Code means (i) the United States Bankruptcy Code, (ii) the
Bankruptcy and Insolvency Act (Canada) and (iii) the Companies' Creditors
Arrangement Act (Canada), as the same may be amended and together with any
successor statutes.

         Base Rate means, for any day, a rate per annum equal to the lesser of
(a) the then applicable Margin Percentage from time to time in effect plus the
greater of (1) the applicable Prime Rate for that day and (2) the Federal Funds
Rate for that day plus 1/2 of 1% or (b) the Ceiling Rate. If for any reason any
applicable Agent shall have determined (which determination shall be conclusive
and binding, absent manifest error) that it is unable to ascertain the Federal
Funds Rate for any reason, including, without limitation, the inability or
failure of Agent to obtain sufficient quotations in accordance with the terms
hereof, the Base Rate shall, until the circumstances giving rise to such
inability no longer exist, be the lesser of (a) the applicable Prime Rate plus
the then applicable Margin Percentage from time to time in effect or (b) the
Ceiling Rate.

         Base Rate Borrowing means that portion of the principal balance of the
Loans at any time bearing interest at the Base Rate.

         Borrowed Money Indebtedness means, with respect to any Person, without
duplication, (i) all obligations of such Person for borrowed money, (ii) all
obligations of such Person evidenced by bonds, debentures, notes or similar
instruments evidencing borrowed money, (iii) all obligations of such Person
under conditional sale or other title retention agreements relating to Property
purchased by such Person, (iv) all obligations of such Person issued or assumed
as the deferred purchase price of Property or services (excluding obligations
of such Person to creditors for raw materials, inventory, services and supplies
and deferred payments for services to employees and former employees incurred
in the ordinary course of such Person's business), (v) all lease obligations of
such Person which have been capitalized on the balance sheet of such Person in
accordance with GAAP, (vi) all obligations of others secured by any Lien on
Property owned or acquired by such Person, whether or not the obligations
secured thereby have been assumed, equal to the lesser of the amount of such
obligation or the fair market value of such Property, (vii) Interest Rate Risk
Indebtedness of such Person, (viii) all obligations of such Person in respect
of outstanding letters of credit issued for the account of such Person or
bankers' acceptances drawn by such Person and (ix) all guarantees of such
Person.

         Borrowers means U.S. Borrower and Canadian Borrower, collectively.

         Borrowing Base Certificate shall mean a certificate, duly executed by
the chief executive officer, chief financial officer, treasurer or controller
of Borrowers, appropriately completed and in substantially the form of Exhibit
I hereto. Each Borrowing Base Certificate shall be effective only as accepted
by Agents (and with such revisions, if any, as Agents may reasonably require as
a condition to such acceptance).

         Business Day means any day other than a day on which commercial banks
are authorized or required to close in Houston, Texas or Toronto, Ontario.


                                       4

<PAGE>   10

         Calculation Date means the last Business Day of each month.

         Canadian Borrowing Base means, as at any date, the amount of the
Canadian Borrowing Base shown on the Borrowing Base Certificate then most
recently delivered pursuant to Section 7.2(b) hereof, determined by calculating
the amount equal to:

         (i)      80% of the aggregate amount of all Eligible Accounts of the
                  Canadian Subsidiaries at said date, plus

         (ii)     the sum of (x) 20% of that portion of Eligible Inventory of
                  the Canadian Subsidiaries at said date (determined at the
                  lower of cost or market on a consistent basis) which consists
                  of used finished goods, (y) 25% of that portion of Eligible
                  Inventory of the Canadian Subsidiaries at said date
                  (determined at the lower of cost or market on a consistent
                  basis) which consists of work-in-process relating to projects
                  for customers that are not account debtors with respect to
                  any Accounts owing to the Canadian Subsidiaries which are not
                  Eligible Accounts and (z) 50% of the aggregate amount of all
                  other Eligible Inventory of the Canadian Subsidiaries at said
                  date (determined at the lower of cost or market on a
                  consistent basis); provided that the amount calculated
                  pursuant to this clause (ii) shall not -------- -----------
                  exceed 50% of the Canadian Borrowing Base.

In the absence of a current Borrowing Base Certificate, Canadian Agent shall
determine the Canadian Borrowing Base from time to time in its reasonable
discretion, taking into account all information reasonably available to it, and
the Canadian Borrowing Base from time to time so determined shall be the
Borrowing Base for all purposes of this Agreement until a current Borrowing
Base Certificate, in Proper Form, is furnished to and accepted by Canadian
Agent. For purposes of calculating the Canadian Borrowing Base, all amounts or
values expressed in Canadian Dollars shall be converted into Dollars at the
Exchange Rate in effect as of the date of the applicable Borrowing Base
Certificate.

         Canadian Commitment means, as to any Canadian Lender, the obligation,
if any, of such Canadian Lender to make Canadian Revolving Loans, incur or
participate in Letter of Credit Liabilities relating to Canadian Letters of
Credit and accept and purchase Bankers' Acceptances in an aggregate principal
amount at any one time outstanding up to (but not exceeding) the amount, if
any, set forth opposite such Canadian Lender's name on the signature pages
hereof under the caption "Canadian Commitment", or otherwise provided for in an
Assignment and Acceptance Agreement (as the same may be increased or reduced
from time to time pursuant to Section 2.4 hereof).

         Canadian Dollars or C$ means lawful money of Canada.

         Canadian Dollar Revolving Notes means the Notes of Canadian Borrower
evidencing the Canadian Revolving Loans denominated in Canadian Dollars, in the
form of Exhibit H hereto.


                                       5

<PAGE>   11

         Canadian Lender means each lender party hereto with any Canadian
Commitment or any outstanding Canadian Obligations.

         Canadian Letters of Credit has the meaning assigned to such term in
Section 2.2 hereof.

         Canadian Obligations means, as at any date of determination thereof,
the sum of the following (determined without duplication): (i) the aggregate
principal amount of Canadian Revolving Loans outstanding hereunder on such
date, plus (ii) the aggregate amount of the Bankers' Acceptance Liabilities
outstanding on such date, plus (iii) the aggregate amount of Letter of Credit
Liabilities outstanding on such date relating to Canadian Letters of Credit.
For purposes of calculating the aggregate amount of Canadian Obligations, all
amounts or values expressed in Canadian Dollars shall be converted into Dollars
at the Exchange Rate in effect as of the date of determination.

         Canadian Prime Loans means Canadian Revolving Loans made pursuant to
Section 2.1(b) hereof which are denominated in Canadian Dollars.

         Canadian Prime Rate means, on any day, as to Loans denominated in
Canadian Dollars made to Canadian Borrower, the greater of (a) the annual rate
of interest announced from time to time by BNS as its prime rate then in effect
at its Principal Office, being the reference rate used by BNS for determining
interest rates on commercial loans denominated in Canadian Dollars to borrowers
in Canada, and (b) an annual rate of interest equal to the sum of (i) the CDOR
Rate and (ii) 1.00% per annum. The Canadian Prime Rate is a reference rate and
does not necessarily represent the lowest or best rate or a favored rate, and
Chase Texas, BNS, each Agent and each Lender disclaims any statement,
representation or warranty to the contrary. Chase Texas, BNS, any Agent or any
Lender may make commercial loans or other loans at rates of interest at, above
or below the Canadian Prime Rate.

         Canadian Revolving Loan means any revolving credit loan made pursuant
to Section 2.1(b) hereof.

         Canadian Revolving Notes means the Notes of Canadian Borrower
evidencing the Canadian Revolving Loans denominated in Dollars, in the form of
Exhibit C hereto.

         Canadian Subsidiaries means Subsidiaries which are organized under the
laws of the Dominion of Canada, a Province of the Dominion of Canada or any
political subdivision thereof.

         Capital Expenditures means, with respect to any Person for any period,
expenditures in respect of fixed or capital assets by such Person, including
capital lease obligations incurred during such period (to the extent not
already included), which would be reflected as additions to Property, plant or
equipment on a balance sheet of such Person and its consolidated Subsidiaries,
if any, prepared in accordance with GAAP; but excluding expenditures during
such period for the repair or replacement of any fixed or capital asset which
was destroyed, damaged or taken, in whole or in


                                       6

<PAGE>   12

part, to the extent financed by the proceeds of an insurance policy maintained
by such Person or the proceeds of a condemnation award.

         CDOR Rate means, on any day, an annual rate of interest equal to the
average 30 day rate applicable to Canadian bankers' acceptances appearing on
the "Reuters Screen CDOR Page" on such day, or if such day is not a Business
Day, then on the immediately preceding Business Day; provided, however, if such
rate does not appear on the Reuters Screen CDOR Page as contemplated, then the
CDOR Rate on any day shall be calculated as the arithmetic mean of the 30 day
rates applicable to Canadian bankers' acceptances quoted by the Canadian
Lenders which are listed in Schedule I to the Bank Act (Canada) as of 12:00
noon (Toronto, Ontario time) on such day, or if such day is not a Business Day,
then on the immediately preceding Business Day.

         Ceiling Rate means, on any day, the maximum nonusurious rate of
interest permitted for that day by whichever of applicable United States
federal or Texas laws or, in the case of advances made in Canada by Canadian
Lenders to Canadian Borrower, whichever of applicable Canada federal or Ontario
laws (or the laws of any other jurisdiction whose usury laws are deemed to
apply to the Notes or any other Loan Documents despite the intention and desire
of the express choice of law provisions set forth herein) permits the higher
interest rate, stated as a rate per annum. On each day, if any, that Chapter 1D
establishes the Ceiling Rate, the Ceiling Rate shall be the "weekly ceiling"
(as defined in Section 303 of the Texas Finance Code) for that day. U.S. Agent
may from time to time, as to current and future balances, implement any other
ceiling under the Texas Finance Code or Chapter 1D by notice to Borrowers, if
and to the extent permitted by the Texas Finance Code or Chapter 1D. Without
notice to Borrowers or any other Person, the Ceiling Rate shall automatically
fluctuate upward and downward as and in the amount by which such maximum
nonusurious rate of interest permitted by applicable law fluctuates.

         Chapter 1D means Chapter 1D of Title 79, Texas Rev. Civ. Stats. 1925,
as amended.

         Code means the Internal Revenue Code of 1986, as amended, as now or
hereafter in effect, together with all regulations, rulings and interpretations
thereof or thereunder by the Internal Revenue Service.

         Collateral means all Property, tangible or intangible, real, personal
or mixed, now or hereafter subject to the Liens created pursuant to any of the
Security Documents.

         Commitment Fee Percentage means (i) on any day prior to October 1,
1998, 0.50% per annum and (ii) on and after October 1, 1998, the applicable per
annum percentage set forth at the appropriate intersection in the table shown
below, based on the Debt to Capitalization Ratio as of the last day of the most
recently ended fiscal quarter of U.S. Borrower calculated by U.S. Agent as soon
as practicable after receipt by U.S. Agent of all financial reports required
under this Agreement with respect to such fiscal quarter (including a
Compliance Certificate) (provided, however, that if the Commitment Fee
Percentage is increased as a result of the reported Debt to Capitalization
Ratio, such increase shall be retroactive to the date that U.S. Borrower was
obligated to deliver such

                                       7

<PAGE>   13

financial reports to U.S. Agent pursuant to the terms of this Agreement and
provided further, however, that if the Commitment Fee Percentage is decreased
as a result of the reported Debt to Capitalization Ratio, and such financial
reports are delivered to U.S. Agent not more than ten (10) calendar days after
the date required to be delivered pursuant to the terms of this Agreement, such
decrease shall be retroactive to the date that U.S. Borrower was obligated to
deliver such financial reports to U.S. Agent pursuant to the terms of this
Agreement):

<TABLE>
<CAPTION>
                  Debt to                            Commitment
            Capitalization Ratio                   Fee Percentage
            --------------------                   --------------

<S>                                                <C>
            Greater than or equal to 50%                 0.50

            Greater than or equal to 40% but
            less than 50%                                0.40

            Greater than or equal to 30% but
            less than 40%                                0.30

            Less than 30%                                0.25
</TABLE>

         Commitment Percentage means, as to any Lender, the percentage
equivalent of a fraction the numerator of which is the amount of such Lender's
U.S. Commitment or Canadian Commitment, as the case may be, and the denominator
of which is the aggregate amount of the U.S. Commitments or Canadian
Commitments, as the case may be, of all Lenders.

         Compliance Certificate shall have the meaning given to it in Section
7.2(c) hereof.

         Contribution Agreements means those certain Contribution Agreements
dated concurrently herewith executed by and among, respectively, (i) U.S.
Borrower and the Guarantors in respect of the U.S. Obligations and (ii)
Canadian Borrower and the Guarantors in respect of the Canadian Obligations, as
they may from time to time be amended, modified, restated or supplemented.

         Controlled Group means all members of a controlled group of
corporations and all trades or businesses (whether or not incorporated) under
common control which, together with any Borrower, are treated as a single
employer under Section 414 of the Code or under Applicable Canadian Pension
Legislation.

         Corporation means any corporation, limited liability company,
partnership, joint venture, joint stock association, business trust and other
business entity.

         Cover for Letter of Credit Liabilities or any Bankers' Acceptance
Liabilities shall be effected by paying to U.S. Agent or Canadian Agent, as the
case may be, immediately available funds, to be held by U.S. Agent or Canadian
Agent, as the case may be, in a collateral account maintained by


                                       8

<PAGE>   14

U.S. Agent or Canadian Agent, as the case may be, at its Principal Office and
collaterally assigned to U.S. Agent or Canadian Agent, as the case may be, as
security for the applicable Obligations using documentation reasonably
satisfactory to U.S. Agent or Canadian Agent, as the case may be, in the amount
required by any applicable provision hereof. Such amount shall be retained by
U.S. Agent or Canadian Agent, as the case may be, in such collateral account
until such time as the applicable Letter of Credit shall have expired and the
Reimbursement Obligations, if any, with respect thereto shall have been fully
satisfied or the applicable Bankers' Acceptance shall have matured and the
related Bankers' Acceptance Liabilities shall have been fully satisfied;
provided, however, that at such time if a Default or Event of Default has
occurred and is continuing, U.S. Agent or Canadian Agent, as the case may be,
shall not be required to release such amount in such collateral account from
the time of such collateral assignment until such Default or Event of Default
shall have been cured or waived.

         Currency Exchange Risk Indebtedness means all obligations and
indebtedness of U.S. Borrower with respect to the program for the hedging of
currency exchange risk provided for in any program entered into by U.S.
Borrower for the purpose of reducing U.S. Borrower's and its Subsidiaries'
exposure to currency exchange fluctuations and not for speculative purposes,
approved in writing by U.S. Agent (such approval not to be unreasonably
withheld), as it may from time to time be amended, modified, restated or
supplemented.

         Debt Service means, with respect to any Person for any period, the sum
of (i) Interest Expense for such period and (ii) scheduled principal payments
on obligations included within Borrowed Money Indebtedness for such period.

         Debt to Capitalization Ratio means, as of any day, the ratio,
expressed as a percentage, of (a) Borrowed Money Indebtedness of U.S. Borrower
and its Subsidiaries, on a consolidated basis, as of such date (exclusive of
the categories of Borrowed Money Indebtedness, other than obligations in
respect of bankers' acceptances, described in clauses (vii), (viii) and (ix) of
the definition of "Borrowed Money Indebtedness" set forth in this Section 1.1)
to (b) Total Capitalization as of such date.

         Default means an Event of Default or an event which with notice or
lapse of time or both would, unless cured or waived, become an Event of
Default.

         Dollars, US$ and $ means lawful money of the United States of America.

         Dual Lender means any Lender which has both a U.S. Commitment and a
Canadian Commitment.

         EBITDA means, without duplication, for any period the consolidated net
earnings (excluding any extraordinary gains or losses) of U.S. Borrower and its
Subsidiaries, on a consolidated basis, plus, to the extent deducted in
calculating consolidated net income, depreciation, amortization, other non-cash
items, Interest Expense, federal, state and provincial income tax expense and
non-operating


                                       9

<PAGE>   15


and medical retiree expenses of U.S. Borrower and minus, to the extent added in
calculating consolidated net income, any non-cash items.

         Eligible Accounts shall mean, as at any date of determination thereof,
each Account of a Person which is subject to a Lien created by any Security
Document and on which U.S. Agent (as to U.S. Borrower or any of its
Subsidiaries (other than Canadian Subsidiaries)) or Canadian Agent (as to any
Canadian Subsidiary) shall have a first-priority perfected Lien (subject only
to Permitted Liens) which is at said date payable to such Person and which
complies with the following requirements: (a) (i) the subject goods have been
sold to an account debtor on an absolute sale basis on open account and not on
consignment, on approval or on a "sale or return" basis or subject to any other
repurchase or return agreement and no material part of the subject goods has
been returned, rejected, lost or damaged (provided that the foregoing shall not
disqualify accounts arising from goods sold with usual and customary sales
warranties or having warranty claims which are not material), (ii) the Account
is stated to be payable in Dollars (as to any Eligible Accounts owned by U.S.
Borrower or any of its Subsidiaries (other than Canadian Subsidiaries)) or
Canadian Dollars (as to any Canadian Subsidiary) and is not evidenced by
chattel paper or an instrument of any kind (unless the applicable Agent has a
perfected first priority Lien (subject only to Permitted Liens) on such chattel
paper or instrument) and said account debtor is not insolvent or the subject of
any bankruptcy or insolvency proceedings of any kind unless the applicable
Person has received a letter of credit, bond or other financial guarantee in an
amount equal to or greater than such Account issued by a Qualified Institution
and otherwise in form and substance satisfactory to Agents; (b) the account
debtor must be located in the United States (as to any Eligible Accounts owned
by U.S. Borrower or any of its Subsidiaries (other than Canadian Subsidiaries))
or in the United States or Canada (as to any Canadian Subsidiary), except for
(x) Accounts as to which the applicable Person has received a letter of credit,
bond or other financial guarantee in an amount equal to or greater than such
Account issued by a Qualified Institution and otherwise in form and substance
satisfactory to Agents and (y) other Accounts approved in writing by Agents;
(c) it is a valid obligation of the account debtor thereunder and is not
subject to any offset or other defense on the part of such account debtor or to
any claim on the part of such account debtor denying liability thereunder
(provided that the foregoing shall not disqualify accounts arising from goods
sold with usual and customary sales warranties or having warranty claims which
are not material); (d) it is subject to no Lien whatsoever, except for the
Liens created or permitted pursuant to the Loan Documents; (e) it is evidenced
by an invoice submitted to the account debtor in timely fashion and in the
normal course of business; (f) it has not remained unpaid beyond 90 days after
the date of the invoice (provided, however, that the limitation set forth in
this clause shall not apply to UPRC Receivables); (g) it does not arise out of
transactions with an employee, officer, agent, director or stockholder of the
applicable Person or any Affiliate of such Person; (h) not more than 20% (or
such higher percentage as Agents may approve in writing for any particular
account debtor) of the other Accounts of the applicable account debtor or any
of its Affiliates fail to satisfy all of the requirements of an "Eligible
Account"; (i) inclusion of the applicable Account does not cause the total
Eligible Accounts with respect to the applicable account debtor and its
Affiliates, in the aggregate, to exceed 10% of the total Eligible Accounts
(provided, however, that the limitation set forth in this clause shall not
apply to Investment Grade Account Debtors or to UPRC Receivables), and (j) each
of the representations and warranties set

                                       10

<PAGE>   16


forth in the Security Documents executed by the applicable Person with respect
thereto is true and correct in all material respects on such date. In the event
of any dispute under the foregoing criteria, about whether an Account is or has
ceased to be an Eligible Account, the decision of Agents, made in good faith,
shall be conclusive and binding, absent manifest error.

         Eligible Inventory shall mean, as at any date of determination
thereof, Inventory of a Person which is subject to a Lien created by any
Security Documents and on which U.S. Agent (as to U.S. Borrower or any of its
Subsidiaries (other than Canadian Subsidiaries)) or Canadian Agent (as to any
Canadian Subsidiary) shall have a first-priority perfected Lien (subject only
to Permitted Liens) and which complies with the following requirements: (a)
such Inventory shall be valued in accordance with GAAP and consist of (i)
eligible raw materials, (ii) work-in-process and (iii) finished goods, provided
that all such Inventory shall be within the United States of America (as to
U.S. Borrower or any of its Subsidiaries (other than Canadian Subsidiaries)) or
in the United States of America or Canada (as to any Canadian Subsidiary); (b)
it is in good condition, meets all standards imposed by any Governmental
Authority having regulatory authority over it, its use and/or sale and is
either currently usable or currently salable in the normal course of business
of the applicable Person; (c) it is not in the possession or control of any
warehouseman, bailee, or any agent or processor for or customer of the
applicable Person or, if it is, (i) the applicable Person shall have notified,
in a manner that effectively under applicable law creates a valid and first
priority Lien in favor of the applicable Agent in such Inventory, such
warehouseman, bailee, agent, processor or customer of the applicable Agent's
Lien and (ii) such warehouseman, bailee, agent, processor or customer has
subordinated any Lien it may claim therein and agreed to hold all such
Inventory during the continuance of an Event of Default for the applicable
Agent's account subject to the applicable Agent's instructions, and (d) each of
the representations and warranties set forth in the Security Documents executed
by the applicable Person with respect thereto is true and correct in all
material respects on such date. In the event of any dispute under the foregoing
criteria, about whether a portion of Inventory is or has ceased to be Eligible
Inventory, the decision of Agents, made in good faith, shall be conclusive and
binding, absent manifest error.

         Environmental Claim means any third party (including Governmental
Authorities and employees) action, lawsuit, claim or proceeding (including
claims or proceedings at common law or under the Occupational Safety and Health
Act or similar laws relating to safety of employees) which seeks to impose
liability for (i) noise; (ii) pollution, contamination, protection or clean-up
of the air, surface water, ground water or land; (iii) solid, gaseous or liquid
waste generation, handling, treatment, storage, disposal or transportation;
(iv) exposure to Hazardous Substances; (v) the safety or health of employees or
(vi) the manufacture, processing, distribution in commerce, use, discharge or
storage of Hazardous Substances. An "Environmental Claim" includes, but is not
limited to, a common law action, as well as a proceeding to issue, modify or
terminate an Environmental Permit to the extent that such a proceeding attempts
to redress violations of an applicable permit, license, or regulation as
alleged by any Governmental Authority.

         Environmental Liabilities means all liabilities arising from any
Environmental Claim, Environmental Permit or Requirements of Environmental Law
under any theory of recovery, at law


                                       11

<PAGE>   17

or in equity, and whether based on negligence, strict liability or otherwise,
including but not limited to remedial, removal, response, abatement,
investigative, monitoring, personal injury and damage to Property or injuries
to persons, and any other related costs, expenses, losses, damages, penalties,
fines, liabilities and obligations, and all costs and expenses necessary to
cause the issuance, reissuance or renewal of any Environmental Permit including
reasonable attorneys' fees and court costs.

         Environmental Permit means any permit, license, approval or other
authorization under any applicable Legal Requirement relating to pollution or
protection of health or the environment, including laws, regulations or other
requirements relating to emissions, discharges, releases or threatened releases
of pollutants, contaminants or hazardous substances or toxic materials or
wastes into ambient air, surface water, ground water or land, or otherwise
relating to the manufacture, processing, distribution, use, treatment, storage,
disposal, transport, or handling of pollutants, contaminants or Hazardous
Substances.

         ERISA means the Employee Retirement Income Security Act of 1974, as
amended from time to time, and all rules, regulations, rulings and
interpretations adopted by the Internal Revenue Service or the U.S. Department
of Labor thereunder and, as the context may require, Applicable Canadian
Pension Legislation.

         Eurodollar Rate means for any day during an Interest Period for a
LIBOR Borrowing a rate per annum equal to the lesser of (a) the sum of (1) the
Adjusted LIBOR in effect on the first day of such Interest Period plus (2) the
applicable Margin Percentage from time to time in effect and (b) the Ceiling
Rate. Each Eurodollar Rate is subject to adjustments for reserves, insurance
assessments and other matters as provided for in Sections 3.3 and 11.17 hereof.

         Eurodollar Reserve Requirement means, on any day, that percentage
(expressed as a decimal fraction and rounded, if necessary, to the next highest
one ten thousandth [.0001]) which is in effect on such day for determining all
reserve requirements (including, without limitation, basic, supplemental,
marginal and emergency reserves) applicable to "Eurocurrency liabilities," as
currently defined in Regulation D. Each determination of the Eurodollar Reserve
Requirement by any Agent shall be conclusive and binding, absent manifest
error, and may be computed using any reasonable averaging and attribution
method.

         Event of Default shall have the meaning assigned to it in Section 9.1
hereof.

         Excess Cash Flow means, without duplication, for any period, (i)
EBITDA for such period less (ii) the sum of the principal component of all Debt
Service of U.S. Borrower and its Subsidiaries (other than mandatory prepayments
of the Term Loans calculated on the basis of Excess Cash Flow), cash Interest
Expense of U.S. Borrower and its Subsidiaries, voluntary prepayments of all
Borrowed Money Indebtedness of U.S. Borrower and its Subsidiaries, federal,
state and provincial income taxes allocated to U.S. Borrower and its
Subsidiaries, Permitted Dividends (exclusive of dividends


                                       12

<PAGE>   18

described in clause (iii)(5) of the definition of "Permitted Dividends") and
Capital Expenditures of U.S. Borrower and its Subsidiaries for such period.

         Excess Cash Flow Percentage means (i) 75% at all such times as the
aggregate payments made pursuant to Section 3.2(b)(2) hereof is less than or
equal to the aggregate amount of the dividends made pursuant to clause (iii)(2)
of the definition of "Permitted Dividends" set forth in this Section 1 and (ii)
50% at all other times.

         Exchange Rate means, on any day, (a) with respect to Canadian Dollars
in relation to Dollars, the spot rate as quoted by the Bank of Canada as its
noon spot rate at which Dollars are offered on such day for Canadian Dollars,
and (b) with respect to Dollars in relation to Canadian Dollars, the spot rate
as quoted by The Bank of Canada as its noon spot rate at which Canadian Dollars
are offered on such day for Dollars.

         EXIM Facility means that certain International Revolving Loan
Agreement dated June 30, 1997 executed by and between U.S. Borrower and Chase
Texas and the other security documents contemplated thereby (as the foregoing
may be amended from time to time).

         Federal Funds Rate means, for any day, a fluctuating interest rate per
annum equal for such day to the weighted average of the rates on overnight
Federal funds transactions with members of the Federal Reserve System arranged
by Federal funds brokers, as published for such day (or, if such day is not a
Business Day, for the next preceding Business Day) by the Federal Reserve Bank
of New York, or, if such rate is not so published for any such day which is a
Business Day, the average of the quotations for such day on such transactions
received by U.S. Agent from three Federal funds brokers of recognized standing
selected by U.S. Agent in its sole and absolute discretion.

         Financing Statements means all such Uniform Commercial Code or
Canadian provincial personal Property security financing statements as any
Agent shall reasonably require, in Proper Form, duly executed by the applicable
Borrower (or any other applicable Obligor) to give notice of and to perfect or
continue perfection of the applicable Agent's Liens in any applicable
Collateral, as any of the foregoing may from time to time be amended, modified,
supplemented or restated.

         Fixed Charge Coverage Ratio means, as of any day, the ratio, expressed
as a percentage, of (a) Pro Forma EBITDA for the 12 months ending on such day
less the current portion of federal, state and provincial income tax expense
recognized during such 12-month period to (b) the sum of (1) the principal
component of Debt Service for such 12-month period plus (2) cash Interest
Expense for such 12-month period paid by U.S. Borrower and its Subsidiaries for
such 12-month period plus (3) Permitted Dividends by U.S. Borrower or by any
Subsidiary of U.S. Borrower to any Person other than U.S. Borrower (or a
wholly-owned Subsidiary of U.S. Borrower) for such 12-month period plus (4)
actual Capital Expenditures paid by U.S. Borrower and its Subsidiaries for such
12- month period plus (5) for any day during the fiscal year 1999 and only if
Borrower shall have paid Permitted Dividends pursuant to clause (2) of the
definition of "Permitted Dividends", the amount by which $3,000,000 exceeds
actual Capital Expenditures paid by U.S. Borrower and its Subsidiaries


                                       13

<PAGE>   19


for such 12-month period plus (6) for any day after the fiscal year 1999 and
only if Borrower shall have paid Permitted Dividends pursuant to clause (2) of
the definition of "Permitted Dividends", the amount by which $1,000,000 exceeds
actual Capital Expenditures paid by U.S. Borrower and its Subsidiaries for such
12-month period.

         Foreign Subsidiaries means Subsidiaries which are organized under the
laws of a jurisdiction other than the United States of America, any State of
the United States or any political subdivision thereof.

         Funding Loss means, with respect to (a) any Borrower's payment of
principal of a LIBOR Borrowing on a day other than the last day of the
applicable Interest Period; (b) any Borrower's failure to borrow a LIBOR
Borrowing or to borrow funds by way of Bankers' Acceptances on the date
specified by such Borrower; (c) any Borrower's failure to make any prepayment
of the Loans (other than Base Rate Borrowings and Canadian Prime Loans) on the
date specified by such Borrower, or (d) any cessation of a Eurodollar Rate to
apply to the Loans or any part thereof pursuant to Section 3.3, in each case
whether voluntary or involuntary, any loss, expense, penalty, premium or
liability actually incurred by any Lender (including but not limited to any
loss or expense incurred by reason of the liquidation or reemployment of
deposits or other funds acquired by any Lender to fund or maintain a Loan).

         GAAP means, as to a particular Person, such United States accounting
practice as, in the opinion of independent certified public accountants of
recognized national standing regularly retained by such Person, conforms at the
time to generally accepted accounting principles, consistently applied for all
periods after the Effective Date so as to present fairly the financial
condition, and results of operations and cash flows, of such Person. If any
change in any accounting principle or practice is required by the Financial
Accounting Standards Board, all reports and financial statements required
hereunder may be prepared in accordance with such change so long as the
applicable Person provides to Agents such disclosures of the impact of such
change as any Agent may reasonably require. No such change in any accounting
principle or practice shall, in itself, cause a Default or Event of Default
hereunder (but Borrowers, Agents and Lenders shall negotiate in good faith to
replace any financial covenants hereunder to the extent such financial
covenants are affected by such change in accounting principle or practice).

         Governmental Authority means any governmental authority of the United
States of America, Canada, any State of the United States, any Province of
Canada, or of any other foreign jurisdiction and any political subdivision of
any of the foregoing, and any central bank, agency, department, commission,
board, bureau, court or other tribunal having or asserting jurisdiction over
any Agent, any Lender, any Obligor or their respective Property.

         Group means NATCO Group Inc., a Delaware corporation.

         Guaranties means, collectively, (i) the Guaranties dated concurrently
herewith executed by Group and each Subsidiary of U.S. Borrower (other than
Foreign Subsidiaries) in favor of U.S.

                                      14

<PAGE>   20

Agent, for the benefit of U.S. Lenders, (ii) the Guaranties dated concurrently
herewith executed by U.S. Borrower, Group and each Subsidiary of U.S. Borrower
(other than Foreign Subsidiaries) in favor of Canadian Agent, for the benefit
of Canadian Lenders and (iii) any and all other guaranties hereafter executed
in favor of any Agent, for the benefit of U.S. Lenders or Canadian Lenders,
relating to the Obligations, as any of them may from time to time be amended,
modified, restated or supplemented.

         Hazardous Substance means petroleum products, and any hazardous or
toxic waste or substance defined or regulated as such from time to time by any
law, rule, regulation or order described in the definition of "Requirements of
Environmental Law".

         Interest Expense means, for any period, total interest expense
accruing on Borrowed Money Indebtedness of U.S. Borrower and its Subsidiaries
during such period (including interest expense attributable to capitalized
leases and net costs under interest rate swap, collar, cap or similar
agreements providing interest rate protection), determined in accordance with
GAAP.

         Interest Options means the Base Rate, each Eurodollar Rate and, as to
the Canadian Dollar Revolving Notes only, the Canadian Prime Rate, and
"Interest Option" means any of them.

         Interest Payment Dates means (a) for Base Rate Borrowings and for
Canadian Prime Loans, September 30, 1998 and the last day of each March, June,
September and December thereafter prior to the Revolving Loan Maturity Date or
the Term Loan Maturity Date, as the case may be, and the Revolving Loan
Maturity Date or the Term Loan Maturity Date, as the case may be; and (b) for
LIBOR Borrowings, the end of the applicable Interest Period (and if such
Interest Period exceeds three months' duration, quarterly, commencing on the
first quarterly anniversary of the first day of such Interest Period) and the
Revolving Loan Maturity Date or the Term Loan Maturity Date, as the case may
be.

         Interest Period means, for each LIBOR Borrowing, a period commencing
on the date such LIBOR Borrowing began and ending on the numerically
corresponding day which is, subject to availability as set forth in Section
3.3(c)(iii), 1, 2, 3 or 6 months thereafter, as any Borrower shall elect in
accordance herewith; provided, (1) unless Agents shall otherwise consent, no
Interest Period with respect to a LIBOR Borrowing shall commence on a date
earlier than three (3) Business Days after this Agreement shall have been fully
executed; (2) any Interest Period with respect to a LIBOR Borrowing which would
otherwise end on a day which is not a LIBOR Business Day shall be extended to
the next succeeding LIBOR Business Day, unless such LIBOR Business Day falls in
another calendar month, in which case such Interest Period shall end on the
next preceding LIBOR Business Day; (3) any Interest Period with respect to a
LIBOR Borrowing which begins on the last LIBOR Business Day of a calendar month
(or on a day for which there is no numerically corresponding day in the
calendar month at the end of such Interest Period) shall end on the last LIBOR
Business Day of the appropriate calendar month; (4) no Interest Period for a
Revolving Loan shall ever extend beyond the Revolving Loan Maturity Date and no
Interest Period for an Term Loan shall ever extend beyond the Term Loan
Maturity Date, and (5) Interest Periods shall be selected by




                                       15

<PAGE>   21

each Borrower in such a manner that the Interest Period with respect to any
portion of the Loans which shall become due shall not extend beyond such due
date.

         Interest Rate Risk Agreement means an interest rate swap agreement,
interest rate cap agreement, interest rate collar agreement or similar
arrangement entered into by U.S. Borrower for the purpose of reducing U.S.
Borrower's and its Subsidiaries' exposure to interest rate fluctuations and not
for speculative purposes, approved in writing by U.S. Agent (such approval not
to be unreasonably withheld), as it may from time to time be amended, modified,
restated or supplemented.

         Interest Rate Risk Indebtedness means all obligations and indebtedness
of U.S. Borrower with respect to the program for the hedging of interest rate
risk provided for in any Interest Rate Risk Agreement.

         Investment means the purchase or other acquisition of any securities
or indebtedness of, or the making of any loan, advance, transfer of Property
(other than transfers in the ordinary course of business) or capital
contribution to, or the incurring of any liability (other than trade accounts
payable arising in the ordinary course of business), contingently or otherwise,
in respect of the indebtedness of, any Person.

         Issuer means the issuer (or, where applicable, each issuer) of a
Letter of Credit under this Agreement.

         Investment Grade Account Debtors means account debtors which are rated
A- or better by Standard & Poor's Ratings Services and A-3 or better by Moody's
Investors Service, Inc.

         Key Agreements means the Purchase Agreement, the EXIM Facility and any
document or paper evidencing, securing or otherwise relating to any
Subordinated Indebtedness.

         Legal Requirement means any law, statute, ordinance, decree,
requirement, order, judgment, rule, or regulation (or interpretation of any of
the foregoing) of, and the terms of any license or permit issued by, any
Governmental Authority, whether presently existing or arising in the future.

         Letter of Credit Fee Percentage means (x) with respect to commercial
Letters of Credit, the Margin Percentage from time to time applicable with
respect to LIBOR Borrowings and (y) with respect to standby Letters of Credit
(i) on any day prior to October 1, 1998, 1.75% and (ii) on and after October 1,
1998, the applicable per annum percentage set forth at the appropriate
intersection in the table shown below, based on the Debt to Capitalization
Ratio as of the last day of the most recently ended fiscal quarter of U.S.
Borrower calculated by U.S. Agent as soon as practicable after receipt by U.S.
Agent of all financial reports required under this Agreement with respect to
such fiscal quarter (including a Compliance Certificate) (provided, however,
that if the Letter of Credit Fee Percentage is increased as a result of the
reported Debt to Capitalization Ratio, such increase shall be retroactive to
the date that U.S. Borrower was obligated to deliver such financial reports to



                                       16

<PAGE>   22

U.S. Agent pursuant to the terms of this Agreement and provided further,
however, that if the Letter of Credit Fee Percentage is decreased as a result
of the reported Debt to Capitalization Ratio, and such financial reports are
delivered to U.S. Agent not more than ten (10) calendar days after the date
required to be delivered pursuant to the terms of this Agreement, such decrease
shall be retroactive to the date that U.S. Borrower was obligated to deliver
such financial reports to U.S. Agent pursuant to the terms of this Agreement):

<TABLE>
<CAPTION>
                      Debt to                                 Letter of Credit
                  Capitalization Ratio                        Fee Percentage
                  --------------------                        ----------------

<S>                                                           <C>
                  Greater than or equal to 40%                      1.75

                  Greater than or equal to 30% but
                  less than 40%                                     1.50

                  Greater than or equal to 20% but
                  less than 30%                                     1.25

                  Less than 20%                                     1.00
</TABLE>

         Letter of Credit Liabilities means, at any time and in respect of any
Letter of Credit, the sum of (i) the amount available for drawings under such
Letter of Credit plus (ii) the aggregate unpaid amount of all Reimbursement
Obligations at the time due and payable in respect of previous drawings made
under such Letter of Credit. For the purpose of determining at any time the
amount described in clause (i), in the case of any Letter of Credit payable in
a currency other than Dollars or Canadian Dollars, such amount shall be
converted by Agent to Dollars by any reasonable method, and such converted
amount shall be conclusive and binding, absent manifest error. For purposes of
calculating the aggregate amount of Letter of Credit Liabilities, all amounts
or values expressed in Canadian Dollars shall be converted into Dollars at the
Exchange Rate in effect as of the date of calculation.

         Letters of Credit means the U.S. Letters of Credit and the Canadian
Letters of Credit.

         LIBOR means, for each Interest Period for any LIBOR Borrowing, the
rate per annum (rounded upwards, if necessary, to the nearest 1/16th of 1%)
equal to the average of the offered quotations appearing on Telerate Page 3750
(or if such Telerate Page shall not be available, any successor or similar
service as may be selected by Agents and Borrowers) as of 11:00 a.m., Houston,
Texas time (in respect of a LIBOR Borrowing relating to the U.S. Loans) or
12:00 noon, Toronto, Ontario time (in respect of a LIBOR Borrowing relating to
the Canadian Revolving Loans) (or, in either case, as soon thereafter as
practicable) on the day two LIBOR Business Days prior to the first day of such
Interest Period for deposits in Dollars having a term comparable to such
Interest Period and in an amount comparable to the principal amount of the
LIBOR Borrowing to which such Interest Period relates. If none of such Telerate
Page 3750 nor any successor or similar service is


                                       17

<PAGE>   23

available, then "LIBOR" shall mean, with respect to any Interest Period for any
applicable LIBOR Borrowing, the rate of interest per annum, rounded upwards, if
necessary, to the nearest 1/16th of 1%, quoted by U.S. Agent at or before 11:00
a.m., Houston, Texas time (in respect of a LIBOR Borrowing relating to the U.S.
Loans) or 12:00 noon, Toronto, Ontario time (in respect of a LIBOR Borrowing
relating to the Canadian Revolving Loans) (or, in either case, as soon
thereafter as practicable), on the date two LIBOR Business Days before the
first day of such Interest Period, to be the arithmetic average of the
prevailing rates per annum at the time of determination and in accordance with
the then existing practice in the applicable market, for the offering to U.S.
Agent or Canadian Agent, as the case may be, by one or more prime banks
selected by such Agent in its sole discretion, in the London interbank market,
of deposits in Dollars for delivery on the first day of such Interest Period
and having a maturity equal (or as nearly equal as may be) to the length of
such Interest Period and in an amount equal (or as nearly equal as may be) to
the LIBOR Borrowing to which such Interest Period relates. Each determination
by any Agent of LIBOR shall be conclusive and binding, absent manifest error,
and may be computed using any reasonable averaging and attribution method.

         LIBOR Borrowing means each portion of the principal balance of the
Loans at any time bearing interest at a Eurodollar Rate.

         LIBOR Business Day means a Business Day on which transactions in
Dollar deposits between lenders may be carried on in the London interbank
market.

         Lien means any mortgage, pledge, charge, encumbrance, security
interest, collateral assignment or other lien or restriction of any kind,
whether based on common law, constitutional provision, statute or contract, and
shall include reservations, exceptions, encroachments, easements, rights of
way, covenants, conditions, restrictions and other title exceptions.

         Loans means the U.S. Revolving Loans, the Canadian Revolving Loans and
the Term Loans provided for by Section 2.1 hereof.

         Loan Documents means, collectively, this Agreement, the Notes, the
Bankers' Acceptances, the Bankers' Acceptance Notices, the Guaranties, the
Contribution Agreements, all Applications, the Security Documents, the Notice
of Entire Agreement, all instruments, certificates and agreements now or
hereafter executed or delivered by any Obligor to any Agent or any Lender
pursuant to any of the foregoing or in connection with the Obligations or any
commitment regarding the Obligations, and all amendments, modifications,
renewals, extensions, increases and rearrangements of, and substitutions for,
any of the foregoing.

         Majority Lenders means, at any time while no Obligations are
outstanding, Lenders having greater than 66-2/3% of the aggregate amount of
U.S. Commitments and the Canadian Commitments, and at any time while
Obligations are outstanding, Lenders having greater than 66-2/3% of the sum of
outstanding Term Loans plus U.S. Commitments plus Canadian Commitments;
provided that if all U.S. Commitments and Canadian Commitments have terminated,
the Majority

                                       18

<PAGE>   24


Lenders shall be Lenders having greater than 66-2/3% of the aggregate amount of
all Obligations outstanding.

         Margin Percentage means (i) on any day prior to October 1, 1998, 1.00%
per annum with respect to Base Rate Borrowings and Canadian Prime Loans and
2.50% per annum with respect to LIBOR Borrowings and (ii) on and after October
1, 1998, the applicable per annum percentage set forth at the appropriate
intersection in the table shown below, based on the Debt to Capitalization
Ratio as of the last day of the then most recently ended fiscal quarter of U.S.
Borrower calculated by U.S. Agent as soon as practicable after receipt by U.S.
Agent of all financial reports required under this Agreement with respect to
such fiscal quarter (including a Compliance Certificate) (provided, however,
that if the Margin Percentage is increased as a result of the reported Debt to
Capitalization Ratio, such increase shall be retroactive to the date that U.S.
Borrower was obligated to deliver such financial reports to U.S. Agent pursuant
to the terms of this Agreement and provided further, however, that if the
Margin Percentage is decreased as a result of the reported Debt to
Capitalization Ratio, and such financial reports are delivered to U.S. Agent
not more than ten (10) calendar days after the date required to be delivered
pursuant to the terms of this Agreement, such decrease shall be retroactive to
the date that U.S. Borrower was obligated to deliver such financial reports to
U.S. Agent pursuant to the terms of this Agreement):

<TABLE>
<CAPTION>
                                                                                        Canadian Prime Loans/
             Debt to                                 LIBOR Borrowings                   Base Rate Borrowings
         Capitalization Ratio                        Margin Percentage                   Margin Percentage
         --------------------                        -----------------                   -----------------

<S>                                                  <C>                                 <C>
         Greater than or equal to 50%                         2.50                               1.00

         Greater than or equal to 40% but
         less than 50%                                        2.00                               0.50

         Greater than or equal to 30% but
         less than 40%                                        1.50                               0.0

         Greater than or equal to 20% but
         less than 30%                                        1.25                               0.0

         Less than 20%                                        1.00                               0.0
</TABLE>

         Material Adverse Effect means any material and adverse effect on the
ability of an Obligor to perform its obligations under any Loan Document to
which it is a party or on the business, condition (financial or otherwise),
results of operations, assets, liabilities or prospects of (i) U.S. Borrower
and its Subsidiaries on a consolidated basis, or (ii) Group.

         Maximum Canadian Available Amount means, at any date, an amount equal
to the lesser of (i) $10,000,000 or (ii) the then effective Canadian Borrowing
Base. In connection with the


                                       19

<PAGE>   25

application of any provision hereof using the term "Maximum Canadian Available
Amount", any amounts denominated in Canadian Dollars shall be converted to
Dollars using the then current Exchange Rate. The Maximum Canadian Available
Amount is subject to change pursuant to Section 2.4(c) hereof.

         Maximum U.S. Available Amount means, at any date, an amount equal to
the lesser of (i) $22,000,000 or (ii) the then effective U.S. Borrowing Base.
The Maximum U.S. Available Amount is subject to change pursuant to Section
2.4(c) hereof.

         Net Equity Proceeds means, for any period, (i) the net proceeds
realized from the issuance of any equity securities by U.S. Borrower during
such period minus (ii) the aggregate amount of any dividends paid by U.S.
Borrower pursuant to clause (iii)(3) of the definition of "Permitted Dividends"
during such period.

         Net Worth means, with respect to U.S. Borrower and its Subsidiaries,
the sum of preferred stock (if any), par value of common stock, capital in
excess of par value of common stock, retained earnings and Subordinated
Indebtedness.

         Notes shall have the meaning assigned to such term in Section 2.7
hereof.

         Notice of Entire Agreement means a notice of entire agreement, in
Proper Form, executed by Borrowers, each other Obligor and Agents, as the same
may from time to time be amended, modified, supplemented or restated.

         Obligations means, as at any date of determination thereof, the sum of
the following: (i) the aggregate principal amount of Loans outstanding
hereunder on such date, plus (ii) the aggregate amount of the outstanding
Letter of Credit Liabilities on such date, plus (iii) the aggregate amount of
outstanding Bankers' Acceptance Liabilities on such date, plus (iv) all other
outstanding liabilities, obligations and indebtedness of any Obligor under any
Loan Document on such date. For purposes of calculating the aggregate amount of
Obligations, all amounts or values expressed in Canadian Dollars shall be
converted into Dollars at the Exchange Rate in effect as of the date of
determination.

         Obligors means each Borrower, Group and each Person now or hereafter
executing a Guaranty and/or a Security Agreement.

         Organizational Documents means, with respect to a United States
corporation, the certificate of incorporation, articles of incorporation and
bylaws of such corporation; with respect to a partnership, the partnership
agreement establishing such partnership; with respect to a trust, the
instrument establishing such trust and with respect to any other Person, the
agreements or instruments pursuant to which such Person was formed and by which
such Person is governed; in each case including any and all modifications
thereof as of the date of the Loan Document referring to such Organizational
Document and any and all future modifications thereof.


                                      20

<PAGE>   26

         Past Due Rate means, on any day, a rate per annum equal to the lesser
of (i) the Ceiling Rate for that day or (ii) the applicable Base Rate or
Canadian Prime Rate, as the case may be, plus the Margin Percentage for Base
Rate Borrowings then in effect plus three percent (3%).

         PBGC means the Pension Benefit Guaranty Corporation or any entity
succeeding to any or all of its functions under ERISA and any pension
commission or similar body or fund constituted under any Applicable Canadian
Pension Legislation.

         Permitted Dividends means (i) dividends or distributions by a
Subsidiary of U.S. Borrower to U.S. Borrower or any other Subsidiary (other
than a Foreign Subsidiary) of U.S. Borrower and dividends or distributions by
any Foreign Subsidiary of U.S. Borrower to any other Foreign Subsidiary of U.S.
Borrower, (ii) stock dividends, (iii) so long as no Default or Event of Default
shall have occurred and be continuing (or would result therefrom), (1)
dividends paid by U.S. Borrower to its shareholders, to be applied to corporate
expenses of Group and Group's cash portion of retiree medical expenses, in
aggregate amounts not to exceed $1,500,000 for the fiscal year ending December
31, 1998, $2,000,000 for the fiscal year 1999, and $2,200,000 for the fiscal
year 2000 and each fiscal year thereafter, (2) dividends paid by U.S. Borrower
to its shareholders, to be applied to that portion of the purchase price
payable in connection with the Puts, provided that dividends paid under this
clause 2 shall not exceed (x) $9,500,000 in the aggregate from and after June
30, 2000 through and including December 31, 2000 or (y) $8,500,000 in the
aggregate from and after January 1, 2001 through and including December 31,
2001, (3) dividends paid by U.S. Borrower to its shareholders, to be applied to
the purchase price payable in connection with the Puts, in an aggregate amount
not to exceed the lesser of (x) aggregate purchase costs payable in connection
with the Puts and (y) Net Equity Proceeds received by U.S. Borrower after the
Effective Date, (4) dividends paid by U.S. Borrower to its shareholders, to be
applied to the purchase of shares of Group pursuant to the Winokur Option, so
long as the Winokur Option shall have been assigned by U.S. Borrower to its
shareholders and the proceeds paid in connection with such purchase are
concurrently applied to the payment of the Winokur Note Receivable, and (5) so
long as the payment required under Section 3.2(b)(2) hereof for such fiscal
year (based on Excess Cash Flow for the preceding fiscal year) shall have been
paid, dividends paid by U.S. Borrower to its shareholders for the fiscal year
2001 and in each fiscal year thereafter in an aggregate amount not to exceed
fifty percent (50%) of Excess Cash Flow for the preceding fiscal year.
Dividends permitted under any of clauses (iii)(1), (2). (3), (4) and (5) above
are each cumulative of dividends permitted under any other of such clauses.

         Permitted Investments means: (a) readily marketable securities issued
or fully guaranteed by the full faith and credit of the United States of
America or of Canada with maturities of not more than one year; (b) commercial
paper rated "Prime 1" by Moody's Investors Service, Inc. or "A-1" by Standard
and Poor's Ratings Services or the equivalent thereof by Dominion Bond Rating
Service Limited with maturities of not more than 180 days; (c) certificates of
deposit or repurchase obligations issued by any U.S. or Canadian domestic bank
having capital surplus of at least $100,000,000 or by any other financial
institution acceptable to Agents, all of the foregoing not having a maturity of
more than one year from the date of issuance thereof, and (d) the purchase of



                                       21

<PAGE>   27

shares of Group pursuant to the Winokur Option so long as the proceeds paid in
connection with such purchase are concurrently applied to the payment of the
Winokur Note Receivable.

         Permitted Liens means each of the following: (a) artisans' or
mechanics' Liens arising in the ordinary course of business, and Liens for
taxes, but only to the extent that payment thereof shall not at the time be due
or if due, the payment thereof is being diligently contested in good faith and
adequate reserves computed in accordance with GAAP have been set aside
therefor; (b) Liens in effect on the Effective Date and disclosed to the
Lenders in the financial statements delivered on or prior to the Effective Date
pursuant to Section 6.2 hereof or in a schedule hereto; (c) normal
reservations, exceptions, encroachments, easements, rights of way, covenants,
conditions, restrictions and encumbrances which do not secure Borrowed Money
Indebtedness and which do not have a material adverse effect on the value or
utility of the applicable Property; (d) Liens in favor of any Agent or any
Lender under the Loan Documents, including without limitation, Liens securing
Interest Rate Risk Indebtedness or Currency Exchange Risk Indebtedness owed to
one or more of the U.S. Lenders (but not to any Person which is not, at such
time, a U.S. Lender); (e) Liens incurred or deposits made in the ordinary
course of business (1) in connection with workmen's compensation, unemployment
insurance, social security and other like laws, or (2) to secure insurance in
the ordinary course of business, the performance of bids, tenders, contracts,
leases, licenses, statutory obligations, surety, appeal and performance bonds
and other similar obligations incurred in the ordinary course of business, not,
in any of the cases specified in this clause (2), incurred in connection with
the borrowing of money, the obtaining of advances or the payment of the
deferred purchase price of Property; (f) attachments, judgments and other
similar Liens arising in connection with court proceedings, provided that the
execution and enforcement of such Liens are effectively stayed and the claims
secured thereby are being actively contested in good faith with adequate
reserves made therefor in accordance with GAAP; (g) Liens imposed by law, such
as landlords', carriers', warehousemen's, mechanics', materialmen's and
vendors' liens, incurred in good faith in the ordinary course of business and
securing obligations which are not yet due or which are being contested in good
faith by appropriate proceedings if adequate reserves with respect thereto are
maintained in accordance with GAAP; (h) zoning restrictions, easements,
licenses, reservations, provisions, covenants, conditions, waivers, and
restrictions on the use of Property, and which do not in any case singly or in
the aggregate materially impair the present value or utility of the applicable
Property; (i) Liens securing purchase money Indebtedness permitted under
Section 8.1 hereof and covering the Property so purchased; (j) capital leases
and sale/leaseback transactions permitted under the other provisions of this
Agreement, and (k) extensions, renewals and replacements of Liens referred to
in clauses (a) through (j) of this definition; provided that any such
extension, renewal or replacement Lien shall be limited to the Property or
assets covered by the Lien extended, renewed or replaced and that the Borrowed
Money Indebtedness secured by any such extension, renewal or replacement Lien
shall be in an amount not greater than the amount of the Indebtedness secured
by the Lien extended, renewed or replaced.

         Person means any individual, Corporation, trust, unincorporated
organization, Governmental Authority or any other form of entity.


                                       22

<PAGE>   28

         Plan means an employee pension benefit plan which is covered by Title
IV of ERISA or subject to the minimum funding standards under Section 412 of
the Code or any Applicable Canadian Pension Legislation and is either (a)
maintained by, or contributed to by, any Borrower or any member of the
Controlled Group for employees of any Borrower or any member of the Controlled
Group or (b) maintained pursuant to a collective bargaining agreement or any
other arrangement under which more than one employer makes contributions and to
which any Borrower or any member of the Controlled Group is then making or
accruing an obligation to make contributions or has within the preceding five
plan years made contributions.

         Prime Rate means, on any day, (a) as to Loans made to U.S. Borrower,
the prime rate for that day as determined from time to time by Chase Texas and
(b) as to Loans denominated in Dollars made to Canadian Borrower, the base rate
for that day for Loans denominated in Dollars quoted by BNS. The Prime Rate is,
in each case, a reference rate and does not necessarily represent the lowest or
best rate or a favored rate, and Chase Texas, BNS, each Agent and each Lender
disclaims any statement, representation or warranty to the contrary. Chase
Texas, BNS, any Agent or any Lender may make commercial loans or other loans at
rates of interest at, above or below the Prime Rate.

         Principal Office means (a) as to Obligations of U.S. Borrower, the
principal office of U.S. Agent, presently located at 712 Main Street, Houston,
Harris County, Texas 77002 and (b) as to Obligations of Canadian Borrower, the
principal office of Canadian Agent, presently located at Calgary Commercial
Banking Centre, 240-8 Ave. S.W., Calgary, Alberta T2P 2N7.

         Pro Forma EBITDA means, for any period for which the amount thereof is
to be determined, EBITDA of U.S. Borrower and its Subsidiaries plus (or minus),
without duplication, on a pro forma basis for such period, EBITDA of any Person
becoming a Subsidiary of U.S. Borrower during such period (calculated as if
such Person had been a Subsidiary of U.S. Borrower for all of such period) and
with respect to which Agent and Lenders have been provided with Annual
Financial Statements for the most recently ended fiscal year of such Person
(provided, however, that unaudited annual financial statements for any
applicable Person for the most recently ended fiscal year of such Person shall
be acceptable so long as (i) such financial statements otherwise conform to the
definition of "Annual Financial Statements", (ii) such financial statements are
certified by the chief financial officer or other authorized officer of such
Person as fairly presenting, in all material respects, the financial position
of such person as of the applicable date or dates, and (iii) unaudited
Consolidated EBITDA does not comprise more than 20% of Pro Forma EBITDA).
Borrower shall furnish to Agent supporting calculations for Pro Forma EBITDA
and such other information as Agent may reasonably request to determine the
accuracy of such calculation.

         Proper Form means in form and substance reasonably satisfactory to
Agents.

         Property means any interest in any kind of property or asset, whether
real, personal or mixed, tangible or intangible.


                                       23

<PAGE>   29

         Purchase Agreement means that certain Amended and Restated Agreement
and Plan of Merger dated as of March 26, 1998 executed by and among Group, U.S.
Borrower and The Cynara Company, a Delaware corporation, as the same may from
time to time be amended, modified, restated or supplemented.

         Puts shall have the meaning ascribed to such term in the Purchase
Agreement.

         Qualified Institution means (a) any bank or trust company which is
organized under the laws of any country which is a member of the Organization
for Economic Cooperation and Development or any political subdivision of any
such country; and having capital, surplus and undivided profits aggregating at
least $100,000,000.00 (or its equivalent in another currency) as of the date of
such Person's most recent financial reports, and (b) any other Person approved
in writing by Agents.

         Quarterly Dates means the last day of each March, June, September and
December, provided that if any such date is not a Business Day, then the
relevant Quarterly Date shall be the next succeeding Business Day.

         Quarterly Financial Statements means the quarterly financial
statements of a Person, which statements shall include a balance sheet as of
the end of the applicable fiscal quarter and an income statement and a
statement of cash flows for such fiscal quarter and for the fiscal year to
date, subject to normal year-end adjustments, all setting forth in comparative
form the corresponding figures as of the end of and for the corresponding
fiscal quarter of the preceding year, prepared in accordance with GAAP in all
material respects except that such statements are condensed and exclude
detailed footnote disclosures and certified by the chief financial officer or
other authorized officer of such Person as fairly presenting, in all material
respects, the financial condition of such person as of such date. As to
Borrowers only, Quarterly Financial Statements shall also include unaudited
consolidating financial statements for the applicable Borrower and unaudited
consolidated financial statements for the applicable Borrower and its
Subsidiaries, each in Proper Form, certified in each case by the chief
financial officer or other authorized officer of the applicable Borrower as
presenting fairly in all material respects the consolidating or consolidated,
as the case may be, financial position of the applicable Person. Quarterly
Financial Statements for Canadian Borrower may be adjusted to conform with
generally accepted Canadian accounting principles, consistently applied.

         Rate Designation Date means that Business Day which is (a) in the case
of Base Rate Borrowings by the U.S. Borrower, 11:00 a.m., Houston, Texas time,
and, in the case of Base Rate Borrowings by the Canadian Borrower, 12:00 noon,
Toronto, Ontario time, in each case on the date one Business Day preceding the
date of such borrowing and (b) in the case of LIBOR Borrowings by the U.S.
Borrower, 11:00 a.m., Houston, Texas time, and, in the case of LIBOR Borrowings
by the Canadian Borrower, 12:00 noon, Toronto, Ontario time, in each case, on
the date three LIBOR Business Days preceding the first day of any proposed
Interest Period.

         Rate Designation Notice means a written notice substantially in the
form of Exhibit B.


                                       24

<PAGE>   30

         Refunding Bankers' Acceptance has the meaning specified in Section
2.3(b).

         Regulation D means Regulation D of the Board of Governors of the
Federal Reserve System from time to time in effect and includes any successor
or other regulation relating to reserve requirements applicable to member banks
of the Federal Reserve System.

         Regulatory Change means with respect to any Lender, any change on or
after the Effective Date in any Legal Requirement (including, without
limitation, Regulation D) or the adoption or making on or after such date of
any interpretation, directive or request applying to a class of lenders
including such Lender under any Legal Requirements (whether or not having the
force of law) by any Governmental Authority.

         Reimbursement Obligations means, as at any date, (i) the obligations
of any Borrower then outstanding, or which may thereafter arise, in respect of
Letters of Credit under this Agreement, to reimburse the applicable Issuers for
the amount paid by such Issuers in respect of any drawing under such Letters of
Credit and (ii) the obligations of the Canadian Borrower then outstanding, or
which may thereafter arise, in respect of any Bankers' Acceptance purchased by
any Canadian Lender or paid by it on maturity thereof. Except for Canadian
Letters of Credit denominated in Canadian Dollars, Reimbursement Obligations in
respect of any Letter of Credit shall at all times be payable in Dollars
notwithstanding any such Letter of Credit being payable in a currency other
than Dollars.

         Request for Extension of Credit means a request for extension of
credit duly executed by any responsible officer, which may include the
president, chief executive officer, the chief financial officer, any vice
president or the treasurer of U.S. Borrower or Canadian Borrower, as the case
may be, or any other Person duly authorized by one of such officers,
appropriately completed and substantially in the form of Exhibit A-1 (U.S.
Borrower) or Exhibit A-2 (Canadian Borrower) attached hereto, as the case may
be.

         Requirements of Environmental Law means all requirements imposed by
any law (including for example and without limitation The Resource Conservation
and Recovery Act and The Comprehensive Environmental Response, Compensation,
and Liability Act), rule, regulation, or order of any federal, state or local
executive, legislative, judicial, regulatory or administrative agency, board or
authority in effect at the applicable time which relate to (i) noise; (ii)
pollution, protection or clean-up of the air, surface water, ground water or
land; (iii) solid, gaseous or liquid waste generation, treatment, storage,
disposal or transportation; (iv) exposure to Hazardous Substances; (v) the
safety or health of employees or (vi) regulation of the manufacture,
processing, distribution in commerce, use, discharge or storage of Hazardous
Substances.

         Reset Date has the meaning specified in Section 2.9(a).

         Revolving Loan Maturity Date means the maturity of the Revolving Notes
and the other U.S. Revolving Loan Obligations and Canadian Obligations,
November 30, 2001.


                                       25

<PAGE>   31

         Revolving Loans means the U.S. Revolving Loans, the Canadian Dollar
Notes and the Canadian Revolving Loans.

         Revolving Notes means the U.S. Revolving Notes and the Canadian
Revolving Notes.

         Secretary's Certificate means a certificate, in Proper Form, of the
Secretary or an Assistant Secretary of a corporation (a) that attached thereto
are true and correct copies of resolutions of the Board of Directors of such
corporation authorizing the execution, delivery and performance of the Loan
Documents to be executed by such corporation; (b) the incumbency and signature
of the officer of such corporation executing such Loan Documents on behalf of
such corporation, and (c) that attached thereto are true and correct copies of
the Organizational Documents of such corporation.

         Security Agreements means (i) security agreements, each in Proper
Form, executed or to be executed in favor of U.S. Agent, securing the U.S.
Obligations, covering all of the real Property (other than real Property owned
as of the Effective Date) upon which a Lien must be granted pursuant to Section
7.11 hereof and material personal Property (other than the equity interests
described in clauses (ii) and (iv) of this definition) of U.S. Borrower and its
Subsidiaries (other than Foreign Subsidiaries), (ii) security agreements, each
in Proper Form, executed or to be executed in favor of U.S. Agent, securing the
U.S. Obligations, covering all of the issued and outstanding equity interests
in any Subsidiary of U.S. Borrower (other than Foreign Subsidiaries and other
than Subsidiaries which are wholly-owned direct Subsidiaries of Foreign
Subsidiaries) and 65% of the issued and outstanding equity interests in any
Foreign Subsidiary of U.S. Borrower (other than Foreign Subsidiaries which are
direct Subsidiaries of other Foreign Subsidiaries), (iii) security agreements,
each in Proper Form, executed or to be executed in favor of Canadian Agent,
securing the Canadian Obligations, covering all of the real Property (other
than real Property owned as of the Effective Date) upon which a Lien must be
granted pursuant to Section 7.11 hereof and material personal Property of
Canadian Borrower and each Canadian Subsidiary and (iv) security agreements,
each in Proper Form, executed in favor of Canadian Agent, securing the Canadian
Obligations, covering the remaining 35% of the issued and outstanding equity
interests in any Foreign Subsidiary of U.S. Borrower, as the same may from time
to time be amended, modified, restated or supplemented.

         Security Documents means, collectively, the Security Agreements, the
Financing Statements and any and all other security documents now or hereafter
executed and delivered by any Obligor to secure all or any part of the
Obligations, as any of them may from time to time be amended, modified,
restated or supplemented.

         Stated Rate means, with respect to any Lender, the effective weighted
per annum rate of interest applicable to the Loans made by such Lender;
provided, that if on any day such rate shall exceed the Ceiling Rate for that
day, the Stated Rate shall be fixed at the Ceiling Rate on that day and on each
day thereafter until the total amount of interest accrued at the Stated Rate on
the unpaid principal balances of the Notes plus the Additional Interest equals
the total amount of interest which would have accrued if there had been no
Ceiling Rate. If the Notes mature (or are prepaid) before


                                       26

<PAGE>   32

such equality is achieved, then, in addition to the unpaid principal and
accrued interest then owing pursuant to the other provisions of the Loan
Documents, the applicable Borrower promises to pay on demand to the order of
the holder of the applicable Note interest in an amount equal to the excess (if
any) of (a) the lesser of (i) the total interest which would have accrued on
such Note if the Stated Rate had been defined as equal to the Ceiling Rate from
time to time in effect and (ii) the total interest which would have accrued on
such Note if the Stated Rate were not so prohibited from exceeding the Ceiling
Rate, over (b) the total interest actually accrued on such Note to such
maturity (or prepayment) date. Without notice to any Borrower or any other
Person, the Stated Rate shall automatically fluctuate upward and downward in
accordance with the provisions of this definition.

         Subordinated Indebtedness means all Indebtedness of U.S. Borrower and
its Subsidiaries which has been subordinated on terms and conditions
satisfactory to the Majority Lenders, in their sole discretion, to the
Obligations, whether now existing or hereafter incurred. Indebtedness shall not
be considered as "Subordinated Indebtedness" unless and until Agents shall have
received copies of the documentation evidencing or relating to such
Indebtedness, including subordination provisions, in Proper Form, duly executed
by the holder or holders of such Indebtedness and evidencing the terms and
conditions of subordination required by the Majority Lenders.

         Subsidiary means, as to a particular parent Corporation, any
Corporation of which more than 50% of the indicia of equity rights (whether
outstanding capital stock or otherwise) is at the time directly or indirectly
owned by, such parent Corporation.

         Taxes shall have the meaning ascribed to it in Section 4.1(d) hereof.

         Termination Date means the earlier of (a) the Revolving Loan Maturity
Date or (b) the date specified by either Agent in accordance with Section 9.1
hereof.

         Term Loan means a Loan made pursuant to Section 2.1(d) hereof.

         Term Loan Lender means each U.S. Lender with any outstanding Term
Loans.

         Term Loan Maturity Date means November 30, 2003.

         Term Loan Obligations means, as at any date of determination thereof,
the aggregate principal amount of Term Loans outstanding hereunder on such
date.

         Term Notes means the Notes of U.S. Borrower evidencing the Term Loans,
in substantially the form of Exhibit J hereto.

         Total Canadian Exposure means, at any time and without duplication,
the sum of the aggregate principal amounts of the then outstanding Canadian
Revolving Loans, then outstanding Bankers' Acceptance Liabilities and then
outstanding Letter of Credit Liabilities in respect of


                                       27

<PAGE>   33


Canadian Letters of Credit, in each case expressed in Dollars using, where
applicable, the then current Exchange Rate.

         Total Capitalization means the sum of, without duplication, the
Borrowed Money Indebtedness of U.S. Borrower and its Subsidiaries, on a
consolidated basis, and preferred stock and the consolidated stockholders'
equity (including paid-in capital and retained earnings) of U.S.
Borrower and its Subsidiaries, determined in accordance with GAAP.

         Unfunded Liabilities means, with respect to any Plan, at any time, the
amount (if any) by which (a) the present value of all benefits under such Plan
exceeds (b) the fair market value of all Plan assets allocable to such
benefits, all determined as of the then most recent actuarial valuation report
for such Plan, but only to the extent that such excess represents a potential
liability of any member of the Controlled Group to the PBGC or a Plan under
Title IV of ERISA and, with respect to any Plan governed by Applicable Canadian
Pension Legislation, the amount (if any) by which the solvency liabilities
under such Plan (determined in accordance with actuarial assumptions contained
in the most recent actuarial valuation report for such Plan) exceed the fair
market value of the assets of such Plan. With respect to multi-employer Plans,
the term "Unfunded Liabilities" shall also include contingent liability for
withdrawal liability under Section 4201 of ERISA or under Applicable Canadian
Pension Legislation to all multi-employer Plans to which any Borrower or any
member of a Controlled Group for employees of any Borrower contributes in the
event of complete withdrawal from such plans.

         UPRC Receivables means receivables owing to U.S. Borrower by Union
Pacific Resources Corporation in an aggregate amount not exceeding $6,000,000
which are payable on or before January 31, 1999.

         U.S. Borrowing Base means, as at any date, the amount of the U.S.
Borrowing Base shown on the Borrowing Base Certificate then most recently
delivered pursuant to Section 7.2(b) hereof, determined by calculating the
amount equal to:

         (i)      80% of the aggregate amount of all Eligible Accounts of U.S.
                  Borrower and its Subsidiaries (other than Canadian
                  Subsidiaries) at said date, plus

         (ii)     the sum of (x) 20% of that portion of Eligible Inventory of
                  U.S. Borrower and its Subsidiaries (other than Canadian
                  Subsidiaries) at said date (determined at the lower of cost
                  or market on a consistent basis) which consists of used
                  finished goods, (y) 25% of that portion of Eligible Inventory
                  of U.S. Borrower and its Subsidiaries (other than Canadian
                  Subsidiaries) at said date (determined at the lower of cost
                  or market on a consistent basis) which consists of
                  work-in-process relating to projects for customers that are
                  not account debtors with respect to any Accounts owing to
                  U.S. Borrower and its Subsidiaries (other than Canadian
                  Subsidiaries) which are not Eligible Accounts and (z) 50% of
                  the aggregate amount of all other Eligible Inventory



                                       28

<PAGE>   34

                  of U.S. Borrower and its Subsidiaries (other than Canadian
                  Subsidiaries) at said date (determined at the lower of cost
                  or market on a consistent basis); provided that the amount
                  calculated pursuant to this clause (ii) shall not exceed 50%
                  of the U.S. Borrowing Base.

In the absence of a current Borrowing Base Certificate, U.S. Agent shall
determine the U.S. Borrowing Base from time to time in its reasonable
discretion, taking into account all information reasonably available to it, and
the U.S. Borrowing Base from time to time so determined shall be the Borrowing
Base for all purposes of this Agreement until a current Borrowing Base
Certificate, in Proper Form, is furnished to and accepted by U.S. Agent.

         U.S. Commitment means, as to any U.S. Lender, the obligation, if any,
of such U.S. Lender to make U.S. Revolving Loans and incur or participate in
Letter of Credit Liabilities relating to U.S. Letters of Credit in an aggregate
principal amount at any one time outstanding up to (but not exceeding) the
amount, if any, set forth opposite such U.S. Lender's name on the signature
pages hereof under the caption "U.S. Commitment", or otherwise provided for in
an Assignment and Acceptance Agreement (as the same may be increased or reduced
from time to time pursuant to Section 2.4 hereof).

         U.S. Lender means each lender party hereto with any U.S. Commitment or
any outstanding U.S. Obligations.

         U.S. Letters of Credit shall have the meaning assigned to such term in
Section 2.2 hereof.

         U.S. Loan means a U.S. Revolving Loan or a Term Loan.

         U.S. Obligations means U.S. Revolving Loan Obligations and Term Loan
Obligations.

         U.S. Revolving Loan means a Loan made pursuant to Section 2.1(a)
hereof.

         U.S. Revolving Loan Obligations means, as at any date of determination
thereof, the sum of the following (determined without duplication): (i) the
aggregate principal amount of U.S. Revolving Loans outstanding hereunder on
such date plus (ii) the aggregate amount of the Letter of Credit Liabilities
outstanding on such date relating to U.S. Letters of Credit.

         U.S. Revolving Notes means the Notes of U.S. Borrower evidencing the
U.S. Revolving Loans, in the form of Exhibit D hereto.

         Winokur Note Receivable means the note receivable evidenced by that
certain $1,585,164 unsecured promissory note issued as of March 31, 1998 by
Herbert S. Winokur, Jr. payable to the order of U.S. Borrower.



                                       29

<PAGE>   35

         Winokur Option means that certain Option Agreement dated as of March
31, 1998 executed by and between Herbert S. Winokur, Jr. (as optionor) and U.S.
Borrower (as optionee).

         1.2 Miscellaneous. The words "hereof," "herein," and "hereunder" and
words of similar import when used in this Agreement shall refer to this
Agreement as a whole and not any particular provision of this Agreement.

2.       Commitments; Loans; BA's and Letters of Credit.

         2.1 Loans and BA's. Each Lender severally agrees, subject to all of
the terms and conditions of this Agreement (including, without limitation,
Sections 5.1 and 5.2 hereof), to make Loans and, in the case of Canadian
Lenders, to accept and purchase Bankers' Acceptances, as follows:

         (a) U.S. Revolving Loans. From time to time on or after the Effective
Date and during the Availability Period, each U.S. Lender shall make loans
under this Section 2.1(a) to U.S. Borrower in an aggregate principal amount at
any one time outstanding (including its Commitment Percentage of all Letter of
Credit Liabilities relating to U.S. Letters of Credit at such time) up to but
not exceeding such U.S. Lender's Commitment Percentage of the Maximum U.S.
Available Amount. Subject to the conditions in this Agreement, any such U.S.
Revolving Loan repaid prior to the Termination Date may be reborrowed pursuant
to the terms of this Agreement; provided, that any and all such U.S. Revolving
Loans shall be due and payable in full on the Termination Date. Loans made
under this Section 2.1(a) shall be made and denominated in Dollars. The
aggregate of all U.S. Revolving Loans to be made by the U.S. Lenders in
connection with a particular borrowing shall be equal to the lesser of (i) the
unutilized portion of the U.S. Commitments or (ii) $500,000 or any integral
multiple of $100,000 in excess thereof.

         (b) Canadian Revolving Loans. From time to time on or after the
Effective Date and during the Availability Period, each Canadian Lender shall
make loans under this Section 2.1(b) to Canadian Borrower in an aggregate
principal amount at any one time outstanding (including such Canadian Lender's
Commitment Percentage of all Bankers' Acceptance Liabilities and all Letter of
Credit Liabilities relating to Canadian Letters of Credit at such time) up to
but not exceeding such Canadian Lender's Commitment Percentage of the Maximum
Canadian Available Amount. Subject to the conditions in this Agreement, any
such Canadian Revolving Loan repaid prior to the Termination Date may be
reborrowed pursuant to the terms of this Agreement; provided, that any and all
such Canadian Revolving Loans shall be due and payable in full on the
Termination Date. Loans made under this Section 2.1(b) may, at the option of
Canadian Borrower, be made and denominated either in Dollars or in Canadian
Dollars (but all Loans to be made under a particular borrowing must be made and
denominated in the same currency). The aggregate of all Canadian Revolving
Loans to be made by the Canadian Lenders in connection with a particular
borrowing shall be equal to the lesser of (i) the unutilized portion of the
Canadian Commitments or (ii) $500,000 or any integral multiple of $100,000 in
excess thereof (if the Loans are denominated in




                                       30

<PAGE>   36


Dollars) or C$500,000 or any integral multiple of C$100,000 in excess thereof
(if the Loans are denominated in Canadian Dollars).

         (c) Bankers' Acceptances. From time to time on or after the Effective
Date and during the Availability Period, each Canadian Lender shall accept and
purchase Bankers' Acceptances drawn on it under Section 2.3 hereof by Canadian
Borrower in an aggregate principal amount at any one time outstanding
(including such Canadian Lender's Commitment Percentage of all Canadian
Revolving Loans outstanding at such time and all Letter of Credit Liabilities
relating to Canadian Letters of Credit at such time) up to but not exceeding
such Canadian Lender's Commitment Percentage of the Maximum Canadian Available
Amount. No Bankers' Acceptance may be made or accepted on or after the
Termination Date and all outstanding Bankers' Acceptances shall mature no later
than the end of the Availability Period. Loans made by way of Bankers'
Acceptances shall be made and denominated in Canadian Dollars.

         (d) Term Loans. On the Effective Date, each Term Loan Lender shall
make a loan to U.S. Borrower in the amount set forth opposite such Term Loan
Lender's name on the signature pages hereof under the caption "Term Loans".

         (e) Chapter 346 Not Applicable. Borrowers, Agents and the Lenders
agree pursuant to Chapter 346 ("Chapter 346") of the Texas Finance Code, that
Chapter 346 (which relates to open-end line of credit revolving loan accounts)
shall not apply to this Agreement, the Notes or any Obligation and that neither
the Notes nor any Obligation shall be governed by Chapter 346 or subject to its
provisions in any manner whatsoever.

         2.2 Letters of Credit.

         (a) Letters of Credit. Subject to the terms and conditions of this
Agreement, and on the condition that aggregate Letter of Credit Liabilities
relating to U.S. Letters of Credit shall never exceed $15,000,000 and that
aggregate Letter of Credit Liabilities relating to Canadian Letters of Credit
shall never exceed $5,000,000, (i) U.S. Borrower shall have the right, in
addition to U.S. Revolving Loans provided for in Section 2.1(a) hereof, to
utilize the U.S. Commitments from time to time during the Availability Period
by obtaining the issuance of letters of credit for the account of U.S. Borrower
if U.S. Borrower shall so request in the notice referred to in Section
2.2(b)(i) hereof (such letters of credit as any of them may be amended,
supplemented, extended or confirmed from time to time, being herein
collectively called the "U.S. Letters of Credit") and Canadian Borrower shall
have the right, in addition to Canadian Revolving Loans provided for in Section
2.1(b) hereof and Bankers' Acceptances provided for in Section 2.1(c) hereof,
to utilize the Canadian Commitments from time to time during the Availability
Period by obtaining the issuance of letters of credit for the account of
Canadian Borrower if Canadian Borrower shall so request in the notice referred
to in Section 2.2(b)(i) hereof (such letters of credit as any of them may be
amended, supplemented, extended or confirmed from time to time, being herein
collectively called the "Canadian Letters of Credit") and (ii) Chase Texas
agrees to issue U.S. Letters of Credit and BNS agrees to issue Canadian Letters
of Credit. The Letters of Credit will, at the request of the applicable


                                       31

<PAGE>   37

Borrower, be issued in currencies other than those expressly provided for in
this Agreement so long as the applicable Agent is reasonably satisfied that
such currency is readily available in the required amounts and that such
currency selection is not otherwise disadvantageous to any Agent or any Lender.
Upon the date of the issuance of a Letter of Credit, the applicable Issuer
shall be deemed, without further action by any party hereto, to have sold to
each U.S. Lender or Canadian Lender, as the case may be, and each such U.S.
Lender or Canadian Lender, as the case may be, shall be deemed, without further
action by any party hereto, to have purchased from the applicable Issuer, a par
ticipation, to the extent of such Lender's Commitment Percentage, in such
Letter of Credit and the related Letter of Credit Liabilities, which
participation shall terminate on the earlier of the expiration date of such
Letter of Credit or the Termination Date. Any Letter of Credit that shall have
an expiration date after the end of the Availability Period shall be subject to
Cover or backed by a letter of credit in form and substance, and issued by a
Person, acceptable to the applicable Agent in its sole discretion. Chase Texas
or, with the prior approval of U.S. Borrower, U.S. Agent and the applicable
U.S. Lender, another U.S. Lender shall be the Issuer of each U.S. Letter of
Credit; and BNS or, with the prior approval of Canadian Borrower, Canadian
Agent and the applicable Canadian Lender, another Canadian Lender shall be the
Issuer of each Canadian Letter of Credit. Except as provided above, all U.S.
Letters of Credit shall be denominated in Dollars and all Canadian Letters of
Credit shall, at the option of Canadian Borrower, be denominated in either
Dollars or Canadian Dollars. Fees due in respect of a U.S. Letter of Credit
shall be payable in Dollars and fees due in respect of a Canadian Letter of
Credit shall be payable (i) in Dollars, if such Letter of Credit is denominated
in Dollars and (ii) in Canadian Dollars if such Letter of Credit is denominated
in Canadian Dollars or any other currency. Letters of credit previously issued
under the provisions of the Loan Agreement dated June 30, 1997 described in
Section 11.19 hereof shall constitute "Letters of Credit" hereunder.

         (b) Additional Provisions. The following additional provisions shall
apply to each Letter of Credit:

                  (i) U.S. Borrower or Canadian Borrower, as the case may be,
         shall give the appropriate Agent notice requesting each issuance of a
         Letter of Credit hereunder as provided in Section 4.3 hereof and shall
         furnish such additional information regarding such transaction as such
         Agent may reasonably request. Upon receipt of such notice, such Agent
         shall promptly notify each U.S. Lender or Canadian Lender, as the case
         may be, of the contents thereof and of such Lender's Commitment
         Percentage of the amount of such proposed Letter of Credit.

                  (ii) No U.S. Letter of Credit may be issued if after giving
         effect thereto the sum of (A) the aggregate outstanding principal
         amount of U.S. Revolving Loans plus (B) the aggregate Letter of Credit
         Liabilities relating to U.S. Letters of Credit would exceed the
         Maximum U.S. Available Amount. No Canadian Letter of Credit may be
         issued if after giving effect thereto the sum of (A) the aggregate
         outstanding principal amount of Canadian Revolving Loans plus (B) the
         aggregate Letter of Credit Liabilities relating to Canadian Letters of
         Credit plus (C) the aggregate Bankers' Acceptance Liabilities would
         exceed the


                                       32

<PAGE>   38

         Maximum Canadian Available Amount. On each day during the period
         commencing with the issuance of any Letter of Credit and until such
         Letter of Credit shall have expired or been terminated, the U. S.
         Commitment or Canadian Commitment, as the case may be, of each
         applicable Lender shall be deemed to be utilized for all purposes
         hereof, including Section 2.5(a), in an amount equal to such Lender's
         Commitment Percentage of the amount then available for drawings under
         such Letter of Credit (or any unreimbursed drawings under such Letter
         of Credit).

                  (iii) Upon receipt from the beneficiary of any Letter of
         Credit of any demand for payment thereunder, the applicable Issuer
         shall notify the Agents and thereafter the U.S. Agent or the Canadian
         Agent, as the case may be, shall promptly notify the applicable
         Borrower and each applicable Lender as to the amount to be paid as a
         result of such demand and the payment date therefor. If at any time
         prior to the earlier of the expiration date of a Letter of Credit or
         the Termination Date any applicable Issuer shall have made a payment
         to a beneficiary of a Letter of Credit in respect of a drawing under
         such Letter of Credit, each applicable Lender will pay to the U.S.
         Agent or the Canadian Agent, as the case may be, immediately upon
         demand by such Issuer at any time during the period commencing after
         such payment until reimbursement thereof in full by the applicable
         Borrower, an amount equal to such Lender's U.S. Commitment Percentage
         or Canadian Commitment Percentage, as the case may be, of such
         payment, together with interest on such amount for each day from the
         date of demand for such payment (or, if such demand is made after
         11:00 a.m. Houston, Texas time (in the case of a U.S. Letter of
         Credit) or 12:00 noon Toronto, Ontario time (in the case of a Canadian
         Letter of Credit) on such date, from the next succeeding Business Day)
         to the date of payment by such Lender of such amount at a rate of
         interest per annum equal to (i) in respect of U.S. Letters of Credit,
         the Federal Funds Rate, (ii) in respect of Canadian Letters of Credit
         which are denominated in Dollars, the Base Rate plus two percent (2%)
         and (iii) in respect of Canadian Letters of Credit which are
         denominated in Canadian Dollars, the CDOR Rate. To the extent that it
         is ultimately determined that the applicable Borrower is relieved of
         its obligation to reimburse the applicable Issuer because of such
         Issuer's gross negligence or willful misconduct in determining that
         documents received under any applicable Letter of Credit comply with
         the terms thereof, the applicable Issuer shall be obligated to refund
         to the paying Lenders all amounts paid to such Issuer to reimburse
         Issuer for the applicable drawing under such Letter of Credit.

                  (iv) U.S. Borrower or the Canadian Borrower, as the case may
         be, shall be irrevocably and unconditionally obligated forthwith to
         reimburse the appropriate Agent, on the date on which such Agent
         notifies U.S. Borrower or the Canadian Borrower, as the case may be,
         of the date and amount of any payment by the applicable Issuer of any
         drawing under a Letter of Credit, for the amount paid by such Issuer
         upon such drawing, without presentment, demand, protest or other
         formalities of any kind, all of which are hereby waived. Such
         reimbursement may, subject to satisfaction of the conditions in
         Sections 5.1 and 5.2 hereof, the limitations on size contained in
         Section 2.1 and to the Maximum U.S. Available Amount or Maximum
         Canadian Available Amount, as the case may be (after


                                       33

<PAGE>   39

         adjustment in the same to reflect the elimination of the corresponding
         Letter of Credit Liability), be made by the borrowing of Loans or, in
         the case of the Canadian Borrower, by the issuance, acceptance and
         purchase of Bankers' Acceptances. The applicable Agent will pay to
         each Lender such Lender's Commitment Percentage of all amounts
         received from U.S. Borrower or the Canadian Borrower, as the case may
         be, for application in payment, in whole or in part, of the
         Reimbursement Obligation in respect of any Letter of Credit, but only
         to the extent such Lender has made payment to the applicable Agent in
         respect of such Letter of Credit pursuant to clause (iii) above.

                  (v) U.S. Borrower or the Canadian Borrower, as the case may
         be, will pay to the appropriate Agent at the Principal Office of such
         Agent for the account of each applicable Lender a letter of credit fee
         with respect to each Letter of Credit equal to the greater of (x) $500
         or (y) the Letter of Credit Fee Percentage multiplied by the daily
         average amount available for drawings under each Letter of Credit (and
         computed on the basis of the actual number of days elapsed in a year
         composed of 360 days), in each case for the period from and including
         the date of issuance of such Letter of Credit to and including the
         date of expiration or termination thereof, such fee to be due and
         payable quarterly in arrears on each three (3) month anniversary of
         the issuance of the applicable Letter of Credit and upon expiration or
         termination of the applicable Letter of Credit. The applicable Agent
         will pay to each applicable Lender, promptly after receiving any
         payment in respect of letter of credit fees referred to in this clause
         (v), an amount equal to the product of such Lender's U.S. Commitment
         Percentage or Canadian Commitment Percentage, as the case may be,
         times the amount of such fees. In addition to and cumulative of the
         above described fees, U.S. Borrower or the Canadian Borrower, as the
         case may be, shall pay to the appropriate Agent, for the account of
         the applicable Issuer, in advance on the date of the issuance of the
         applicable Letter of Credit, a fronting fee in an amount equal to 1/8%
         of the face amount of the applicable Letter of Credit (such fronting
         fee to be retained by the applicable Issuer for its own account).

                  (vi) The issuance by the applicable Issuer of each Letter of
         Credit shall, in addition to the conditions precedent set forth in
         Section 5 hereof, be subject to the conditions precedent (A) that such
         Letter of Credit shall be in such form and contain such terms as shall
         be reasonably satisfactory to applicable Agent, and (B) that U.S.
         Borrower or the Canadian Borrower, as the case may be, shall have
         executed and delivered such Applications and other instruments and
         agreements relating to such Letter of Credit as the applicable Agent
         shall have reasonably requested and are not inconsistent with the
         terms of this Agreement. In the event of a conflict between the terms
         of this Agreement and the terms of any Application, the terms hereof
         shall control.

                  (vii) Each Issuer will send to U.S. Borrower or the Canadian
         Borrower, as the case may be, and each applicable Lender, immediately
         upon issuance of any Letter of Credit issued by such Issuer or any
         amendment thereto, a true and correct copy of such Letter of Credit or
         amendment.



                                       34

<PAGE>   40

         (c) Indemnification; Release. U.S. Borrower or the Canadian Borrower,
as the case may be, hereby indemnifies and holds harmless each Agent, each
Lender and each Issuer from and against any and all claims, damages, losses,
liabilities, costs or expenses which such Agent, such Lender or such Issuer may
incur (or which may be claimed against such Agent, such Lender or such Issuer
by any Person whatsoever), REGARDLESS OF WHETHER CAUSED IN WHOLE OR IN PART BY
THE NEGLIGENCE OF ANY OF THE INDEMNIFIED PARTIES, in connection with the
execution and delivery of any Letter of Credit or transfer of or payment or
failure to pay under any Letter of Credit; provided that U.S. Borrower or the
Canadian Borrower, as the case may be, shall not be required to indemnify or
hold harmless any party seeking indemnification for any claims, damages,
losses, liabilities, costs or expenses to the extent, but only to the extent,
caused by (i) the willful misconduct or gross negligence of the party seeking
indemnification or exoneration, or (ii) the failure by the party seeking
indemnification to pay under any Letter of Credit after the presentation to it
of a request required to be paid under applicable law. U.S. Borrower or the
Canadian Borrower, as the case may be, hereby releases, waives and discharges
each Agent, each Lender and each Issuer from any claims, causes of action,
damages, losses, liabilities, reasonable costs or expenses which may now exist
or may hereafter arise, REGARDLESS OF WHETHER CAUSED IN WHOLE OR IN PART BY THE
NEGLIGENCE OF ANY OF THE INDEMNIFIED PARTIES, by reason of or in connection
with the failure of any Agent, any Issuer or any other Lender to fulfill or
comply with its obligations to such Agent, such Lender or such Issuer, as the
case may be, hereunder (but nothing herein contained shall affect any rights
U.S. Borrower or the Canadian Borrower, as the case may be, may have against
such defaulting party or may have in respect of gross negligence or willful
misconduct). Nothing in this Section 2.2(c) is intended to limit the
obligations of U.S. Borrower or the Canadian Borrower, as the case may be,
under any other provision of this Agreement.

         (d) Additional Costs in Respect of Letters of Credit. Subject to
Sections 11.7 and 11.17 hereof, if as a result of any Regulatory Change there
shall be imposed, modified or deemed applicable any tax (other than any tax
based on or measured by net income), reserve, special deposit or similar
requirement against or with respect to or measured by reference to Letters of
Credit issued or to be issued hereunder or participations in such Letters of
Credit, and the result shall be to increase the cost to any Lender of issuing
or maintaining any Letter of Credit or any participation therein, or materially
reduce any amount receivable by any Lender hereunder in respect of any Letter
of Credit or any participation therein (which increase in cost, or reduction in
amount receivable, shall be the result of such Lender's reasonable allocation
of the aggregate of such increases or reductions resulting from such event),
then such Lender shall notify U.S. Borrower or the Canadian Borrower, as the
case may be, through the appropriate Agent (which notice shall be accompanied
by a statement setting forth in reasonable detail the basis for the
determination of the amount due), and within 15 Business Days after demand
therefor by such Lender through such Agent, U.S. Borrower or the Canadian
Borrower, as the case may be, shall pay to such Lender, from time to time as
specified by such Lender, such additional amounts as shall be sufficient to
compensate such Lender for such increased costs or reductions in amount. Such
statement as to such increased costs or reductions in amount incurred by such
Lender, submitted by such Lender to U.S. Borrower or the Canadian Borrower, as
the case may be, shall be conclusive as to the amount thereof, absent manifest
error,


                                       35

<PAGE>   41

and may be computed using any reasonable averaging and attribution method. Each
Lender will notify U.S. Borrower or the Canadian Borrower, as the case may be,
through the appropriate Agent of any event occurring after the date of this
Agreement which will entitle such Lender to compensation pursuant to this
Section as promptly as practicable after any executive officer of such Lender
obtains knowledge thereof and determines to request such compensation, and (if
so requested by U.S. Borrower or the Canadian Borrower, as the case may be,
through the appropriate Agent) will designate a different lending office of
such Lender for the issuance or maintenance of Letters of Credit by such Lender
or will take such other action as U.S. Borrower or the Canadian Borrower, as
the case may be, may reasonably request if such designation or action is
consistent with the internal policy of such Lender and legal and regulatory
restrictions, can be undertaken at no additional cost, will avoid the need for,
or reduce the amount of, such compensation and will not, in the sole opinion of
such Lender, be disadvantageous to such Lender (provided that no such U.S.
Lender shall have any obligation so to designate a different lending office
which is not located in the United States of America and no such Canadian
Lender shall have any obligation so to designate a different lending office
which is not located in Canada).

         2.3 Certain Provisions Relating to Bankers' Acceptances.

         (a) Subject to the terms and conditions hereof, each Canadian Lender
severally agrees to accept and purchase Bankers' Acceptances drawn upon it by
the Canadian Borrower denominated in Canadian Dollars. The Canadian Borrower
shall notify the Canadian Agent by irrevocable written notice (each a "Bankers'
Acceptance Notice") by 12:00 noon (Toronto, Ontario time) two (2) Business Days
prior to the proposed date of any borrowing by way of Bankers' Acceptances.
Each borrowing by way of Bankers' Acceptances shall be in a minimum aggregate
face amount of C$1,000,000.00 and integral multiples of C$100,000.00 in excess
thereof. The face amount of each Bankers' Acceptance shall be C$100,000.00 or
any integral multiple thereof. Each Bankers' Acceptance Notice shall be in the
form of Exhibit G.

                  (1) Bankers' Acceptances shall be issued and shall mature on
         a Business Day. Each Bankers' Acceptance shall have a term of 30, 60,
         90 or, if available, 180 days excluding days of grace and shall mature
         on or before the Revolving Loan Maturity Date and shall be in form and
         substance reasonably satisfactory to each Canadian Lender.

                  (2) To facilitate the acceptance of Bankers' Acceptances
         under this Agreement, the Canadian Borrower shall, upon execution of
         this Agreement and from time to time as required, provide to the
         Canadian Agent drafts, in form satisfactory to the Canadian Agent,
         duly executed and endorsed in blank by the Canadian Borrower in
         quantities sufficient for each Canadian Lender to fulfill its
         obligations hereunder. In addition, the Canadian Borrower hereby
         appoints each Canadian Lender as its attorney to sign and endorse on
         its behalf, in handwriting or by facsimile or mechanical signature as
         and when deemed necessary by such Canadian Lender, blank forms of
         Bankers' Acceptances. The Canadian Borrower recognizes and agrees that
         all Bankers' Acceptances signed and/or endorsed on its behalf by a
         Canadian Lender shall bind the Canadian Borrower as fully and
         effectually as if


                                       36

<PAGE>   42


         signed in the handwriting of and duly issued by the proper signing
         officer of the Canadian Borrower. Each Canadian Lender is hereby
         authorized to issue such Bankers' Acceptances endorsed in blank in
         such face amounts as may be determined by such Canadian Lender
         provided that the aggregate amount thereof is equal to the aggregate
         amount of Bankers' Acceptances required to be accepted by such
         Canadian Lender. No Canadian Lender shall be responsible or liable for
         its failure to accept a Bankers' Acceptance if the cause of such
         failure is, in whole or in part, due to the failure of the Canadian
         Borrower to provide duly executed and endorsed drafts to the Canadian
         Agent on a timely basis nor shall any Canadian Lender be liable for
         any damage, loss or other claim arising by reason of any loss or
         improper use of any such instrument except loss or improper use
         arising by reason of the gross negligence or willful misconduct of
         such Canadian Lender, its officers, employees, agents or
         representatives. Each Canadian Lender shall maintain a record with
         respect to Bankers' Acceptances (i) received by it from the Canadian
         Agent in blank hereunder, (ii) voided by it for any reason, (iii)
         accepted by it hereunder, (iv) purchased by it hereunder and (v)
         canceled at their respective maturities. Each Canadian Lender further
         agrees to retain such records in the manner and for the statutory
         periods provided in the various Canadian provincial or federal
         statutes and regulations which apply to such Canadian Lender.

                  (3) Drafts of the Canadian Borrower to be accepted as
         Bankers' Acceptances hereunder shall be duly executed by a duly
         authorized officer of the Canadian Borrower or by a Canadian Lender on
         its behalf as aforesaid. Notwithstanding that any person whose
         signature appears on any Bankers' Acceptance as a signatory for the
         Canadian Borrower or for a Canadian Lender as attorney for Canadian
         Borrower may no longer be an authorized signatory for the Canadian
         Borrower or such Canadian Lender, as the case may be, at the date of
         issuance of a Bankers' Acceptance, such signature shall nevertheless
         be valid and sufficient for all purposes as if such authority had
         remained in force at the time of such issuance and any such Bankers'
         Acceptance so signed shall be binding on the Canadian Borrower.

                  (4) Promptly following receipt of a Bankers' Acceptance
         Notice, the Canadian Agent shall so advise the Canadian Lenders and
         shall advise each Canadian Lender of the face amount of each Bankers'
         Acceptance to be accepted by it and the term thereof. The aggregate
         face amount of Bankers' Acceptances to be accepted by a Canadian
         Lender shall be determined by the Canadian Agent by reference to the
         respective Canadian Commitments of the Canadian Lenders, except that,
         if the face amount of a Bankers' Acceptance, which would otherwise be
         accepted by a Canadian Lender, would not be C$100,000.00 or an
         integral multiple thereof, such face amount shall be increased or
         reduced by the Canadian Agent in its sole and unfettered discretion to
         the nearest integral multiple of C$100,000.00.

                  (5) Each Bankers' Acceptance to be accepted by a Canadian
         Lender shall be accepted at such Canadian Lender's office shown on the
         signature pages hereof or as otherwise designated by such Canadian
         Lender from time to time.



                                       37

<PAGE>   43

                  (6) On the relevant borrowing date, each Canadian Lender
         severally agrees to purchase from the Canadian Borrower, at the face
         amount thereof discounted by the Applicable BA Discount Rate, any
         Bankers' Acceptance accepted by it and provide to the Canadian Agent,
         for the account of the Canadian Borrower, the BA Discount Proceeds in
         respect thereof after deducting therefrom the amount of the Acceptance
         Fee payable by the Canadian Borrower to such Canadian Lender under
         Section 2.3(c) in respect of such Bankers' Acceptance.

                  (7) Each Canadian Lender may at any time and from time to
         time hold, sell, rediscount or otherwise dispose of any or all
         Bankers' Acceptances accepted and purchased by it.

                  (8) The Canadian Borrower waives presentment for payment and
         any other defense to payment of any amounts due to a Canadian Lender
         in respect of a Bankers' Acceptance accepted by it pursuant to this
         Agreement which might exist solely by reason of such Bankers'
         Acceptance being held, at the maturity thereof, by such Canadian
         Lender in its own right and the Canadian Borrower agrees not to claim
         any days of grace if such Canadian Lender as holder sues the Canadian
         Borrower on the Bankers' Acceptances for payment of the amount payable
         by the Canadian Borrower thereunder.

         (b) With respect to each Bankers' Acceptance, the Canadian Borrower,
prior to the occurrence and continuation of a Default, may give irrevocable
telephone or written notice (or such other method of notification as may be
agreed upon between the Canadian Agent and the Canadian Borrower) to the
Canadian Agent at or before 12:00 noon (Toronto, Ontario time) two (2) Business
Days prior to the maturity date of such Bankers' Acceptance followed by written
confirmation electronically transmitted to the Canadian Agent on the same day,
of the Canadian Borrower's intention to issue one or more Bankers' Acceptance
on such maturity date (each a "Refunding Bankers' Acceptance") to provide for
the payment of such maturing Bankers' Acceptance (it being understood that
payments by the Canadian Borrower and fundings by the Canadian Lenders in
respect of each maturing Bankers' Acceptance and each related Refunding
Bankers' Acceptance shall be made on a net basis reflecting the difference
between the face amount of such maturing Bankers' Acceptance and the BA
Discount Proceeds (net of the applicable Acceptance Fee) of such Refunding
Bankers' Acceptance). Any funding on account of any maturing Bankers'
Acceptance must be made at or before 12:00 noon (Toronto, Ontario time) on the
maturity date of such Bankers' Acceptance. If the Canadian Borrower fails to
give such notice, then subject to satisfaction of the conditions in Section 5
hereof and to the Maximum Canadian Available Amount, the Canadian Borrower
shall be irrevocably deemed to have requested and to have been advanced a
Canadian Prime Loan in the face amount of such maturing Bankers' Acceptance on
the maturity date of such Bankers' Acceptance from the Canadian Lender which
accepted such maturing Bankers' Acceptance, which Canadian Prime Loan shall
thereafter bear interest as such in accordance with the provisions hereof until
paid in full.




                                       38

<PAGE>   44

         (c) An Acceptance Fee shall be payable by the Canadian Borrower to
each Canadian Lender in advance (in the manner specified in Section 2.3(a)(6))
in respect of, and as a condition precedent to the acceptance by such Canadian
Lender of, a Bankers' Acceptance to be accepted by such Canadian Lender
calculated at the rate per annum equal to the Margin Percentage applicable to
LIBOR Borrowings, calculated on the face amount of such Bankers' Acceptance and
computed on the basis of the number of days in the term of such Bankers'
Acceptance and a year of 365 days.

         2.4 Terminations, Reductions or Reallocations of Commitments.

         (a) Mandatory. On the Termination Date, all U.S. Commitments and
Canadian Commitments shall be terminated in their entirety.

         (b) Optional. U.S. Borrower or Canadian Borrower, as the case may be,
shall have the right to terminate or reduce the unused portion of the U.S.
Commitments or the Canadian Commitments, as the case may be, at any time or
from time to time, provided that (i) U.S. Borrower or Canadian Borrower, as the
case may be, shall give notice of each such termination or reduction to the
appropriate Agent as provided in Section 4.3 hereof and (ii) each such partial
reduction shall be in an integral multiple of $2,000,000. Notwithstanding the
foregoing, U.S. Borrower may not reduce the U.S. Commitments below the then
outstanding principal balance of the U.S. Revolving Loan Obligations and
Canadian Borrower may not reduce the Canadian Commitments below the then
outstanding principal balance of the Canadian Obligations. No termination or
reduction of the Commitments pursuant to this provision may be reinstated
without the prior written approval of Agents and the Lenders.

         (c) Reallocations. Any Dual Lender may agree with Borrowers to
reallocate its existing U.S. Commitment and Canadian Commitment, so long as the
sum of such U.S. Commitment and Canadian Commitment remains unchanged. In
addition, with the prior written consent of all of the Dual Lenders, any U.S.
Lender may agree with Borrowers to convert a portion of its U.S. Commitment
into a Canadian Commitment, thereby becoming a Dual Lender, and any Canadian
Lender may agree with Borrowers to convert a portion of its Canadian Commitment
into a U.S. Commitment, in each case so long as (i) each Lender continues to be
a U.S. Lender with a U.S. Commitment of at least $1,000,000 and (ii) the sum of
such Lender's U.S. Commitment and Canadian Commitment remains equal to the
aggregate amount of such Lender's U.S. Commitment and Canadian Commitment prior
to such reallocation. Borrowers shall give written notice to the Agents of any
reallocation pursuant to this provision at least ten (10) Business Days prior
to the effective date of any such reallocation. No Lender shall be required to
agree to any such reallocation, but may do so at its option, in its sole
discretion. The following conditions precedent must be satisfied prior to any
such reallocation becoming effective:

                  (1) no Default or Event of Default shall have occurred and be
         continuing;

                  (2) if, as a result of any such reallocation, the aggregate
         U.S. Revolving Loan Obligations would exceed the aggregate of all of
         the U.S. Commitments, then the U.S.




                                       39

<PAGE>   45
         Borrower shall, on the effective date of such reallocation, repay or
         prepay U.S. Revolving Loans (or provide Cover for Letter of Credit
         Liabilities relating to U.S. Letters of Credit) in accordance with this
         Agreement in an aggregate principal amount such that, after giving
         effect thereto, the aggregate U.S. Revolving Loan Obligations shall not
         exceed the aggregate of all of the U.S. Commitments;

                  (3) if, as a result of any such reallocation, the Total
         Canadian Exposure would exceed the aggregate of all of the Canadian
         Commitments, then the Canadian Borrower shall, on the effective date
         of such reallocation, repay or prepay Canadian Revolving Loans (or
         provide Cover for Letter of Credit Liabilities relating to Canadian
         Letters of Credit or for Bankers' Acceptance Liabilities) in
         accordance with this Agreement in an aggregate principal amount such
         that, after giving effect thereto, the Total Canadian Exposure shall
         not exceed the aggregate of all of the Canadian Commitments;

                  (4) Borrowers shall have paid any amounts (or shall have
         provided Cover) due under Sections 2.9(c) or (d) hereof on the date of
         such reallocation;

                  (5) the Maximum Canadian Available Amount shall be adjusted
         to equal the sum of all of the Canadian Commitments after giving
         effect to such reallocation and the Maximum U.S. Available Amount
         shall be adjusted to equal the sum of all of the U.S. Commitments
         after giving effect to such reallocation;

                  (6) participations by the Lenders in the outstanding Letters
         of Credit and the Letter of Credit Liabilities and the outstanding
         Loans of the Lenders shall be adjusted to give effect to such
         reallocation; provided, however, that in lieu of requiring any
         prepayment of any Bankers' Acceptances in order to make appropriate
         adjustments to give effect to such reallocations, Canadian Borrower
         shall be required to provide additional Cover for any applicable
         portion of the Bankers' Acceptance Liabilities;

                  (7) each Lender whose U.S. Commitment or Canadian Commitment
         shall be the subject of any reallocation shall have received from the
         Borrowers a fee equal to the greater of $3,000.00 or 1/16% of the
         amount of the increase or decrease, as the case be, in its Canadian
         Commitment.

         2.5 Commitment Fees.

         (a) U.S. Borrower shall pay to U.S. Agent for the account of each U.S.
Lender, and Canadian Borrower shall pay to Canadian Agent for the account of
each Canadian Lender, commitment fees for the Availability Period at a rate per
annum equal to the Commitment Fee Percentage. Such commitment fees shall be
computed (on the basis of the actual number of days elapsed in a year composed
of 360 days) on each day and shall be based on the excess of (x) the aggregate
amount of each Lender's U.S. Commitment or Canadian Commitment, as the case may
be, for such day over (y) the sum of (i) the aggregate unpaid principal balance
(in Dollars) of such



                                       40

<PAGE>   46

Lender's applicable Note or Notes on such day plus (ii) the aggregate
applicable Letter of Credit Liabilities as to such Lender for such day plus, in
the case of Canadian Lenders only, (iii) the aggregate Bankers' Acceptance
Liabilities outstanding on such day. Accrued commitment fees shall be payable
in arrears on the Quarterly Dates prior to the Termination Date and on the
Termination Date, with any Canadian Obligations converted to Dollars at the
Exchange Rate on each such date for the purposes of each such calculation.

         (b) All past due fees payable under this Section shall bear interest
at the Past Due Rate.

         2.6 Several Obligations. The failure of any Lender to make any Loan to
be made by it or to accept and purchase any Bankers' Acceptance required to be
so accepted and purchased by it on the date specified therefor shall not
relieve any other Lender of its obligation to make its Loan or to accept and
purchase its Bankers' Acceptance on such date, but neither any Agent nor any
Lender shall be responsible or liable for the failure of any other Lender to
make a Loan or to accept and purchase any Bankers' Acceptance or to participate
in, or co-issue, any Letter of Credit. Notwithstanding anything contained
herein to the contrary, (i) if a U.S. Lender fails to make a U.S. Revolving
Loan as and when required hereunder, then upon each subsequent event which
would otherwise result in payments of principal being made to the defaulting
U.S. Lender, the amount which would have been paid to the defaulting U.S.
Lender shall be divided among the non-defaulting U.S. Lenders ratably according
to their respective Commitment Percentages until the Obligations of each U.S.
Lender (including the defaulting U.S. Lender) are equal to such U.S. Lender's
Commitment Percentage of the total U.S. Revolving Loan Obligations and (ii) if
a Canadian Lender fails to make a Canadian Revolving Loan or accept and
purchase any Bankers' Acceptance as and when required hereunder, then upon each
subsequent event which would otherwise result in payments of principal being
made to the defaulting Canadian Lender, the amount which would have been paid
to the defaulting Canadian Lender shall be divided among the non-defaulting
Canadian Lenders ratably according to their respective Commitment Percentages
until the Obligations of each Canadian Lender (including the defaulting
Canadian Lender) are equal to such Canadian Lender's Commitment Percentage of
the total Canadian Obligations.

         2.7 Notes. The U.S. Revolving Loans made by each U.S. Lender shall be
evidenced by a single U.S. Revolving Note of U.S. Borrower in substantially the
form of Exhibit D hereto payable to the order of such U.S. Lender in a
principal amount equal to the U.S. Commitment of such U.S. Lender, and
otherwise duly completed. The Canadian Revolving Loans made by each Canadian
Lender which are denominated in Dollars shall be evidenced by a single Canadian
Revolving Note of Canadian Borrower in substantially the form of Exhibit C
hereto payable to the order of such Canadian Lender in a principal amount equal
to the Canadian Commitment of such Canadian Lender, and otherwise duly
completed. The Canadian Prime Loans made by each Canadian Lender shall be
evidenced by a single Canadian Dollar Revolving Note of Canadian Borrower in
substantially the form of Exhibit H hereto payable to the order of such
Canadian Lender in a principal amount equal to two times the Canadian
Commitment of such Canadian Lender, and otherwise duly completed. The Term
Loans made by each Lender shall be evidenced by a single Term Note of U.S.
Borrower in substantially the form of Exhibit J hereto payable to the order of
such




                                       41

<PAGE>   47

Lender in a principal amount equal to the sum of the outstanding principal
balance of the Term Loans made by such Lender, and otherwise duly completed.
The promissory notes described in this Section are each, together with all
renewals, extensions, modifications and replacements thereof and substitutions
therefor, called a "Note" and collectively called the "Notes". Each Lender is
hereby authorized by each Borrower to endorse on the schedule (or a
continuation thereof) that may be attached to each Note of such Lender, to the
extent applicable, the date, amount, type of and the applicable period of
interest for each Loan made by such Lender to the applicable Borrower
hereunder, and the amount of each payment or prepayment of principal of such
Loan received by such Lender, provided, that any failure by such Lender to make
any such endorsement shall not affect the obligations of any Borrower under
such Note or hereunder in respect of such Loan.

         2.8 Use of Proceeds. The proceeds of the Loans and of the acceptance
and purchase of Bankers' Acceptances shall be used by the Borrowers for
acquisitions (including the acquisition and related costs contemplated by the
Purchase Agreement) and for other working capital and general corporate
purposes. Neither any Agent nor any Lender shall have any responsibility as to
the use of any proceeds of the Loans or of the acceptance and purchase of
Bankers' Acceptances.

         2.9 Currency Fluctuations.

         (a) Not later than 1:00 p.m. (Houston, Texas time) on each Calculation
Date, the U.S. Agent shall determine the Exchange Rate as of such Calculation
Date. For purposes of this Section and Section 3.2(b)(4) hereof, the Exchange
Rate so determined shall become effective on the first Business Day immediately
following the relevant Calculation Date (a "Reset Date").

         (b) Not later than 4:00 p.m. (Houston, Texas time) on each Reset Date,
the U.S. Agent shall consult with the Canadian Agent and the Agents shall
determine the Total Canadian Exposure and the aggregate U.S. Revolving Loan
Obligations.

         (c) If, on any Reset Date or on the date of any reallocation of the
U.S. Commitments and the Canadian Commitments pursuant to Section 2.4(c)
hereof, the sum of the aggregate U.S. Revolving Loan Obligations and the Total
Canadian Exposure exceeds the aggregate of all of the U.S. Commitments and the
Canadian Commitments by five percent (5%) or more, then (i) the Agents shall
give notice thereof to the Lenders and Borrowers and (ii) the Borrowers shall
within two (2) Business Days thereafter, repay or prepay Loans (or provide
Cover for Letter of Credit Liabilities or Bankers' Acceptance Liabilities) in
accordance with this Agreement in an aggregate principal amount sufficient to
reduce the sum of the aggregate U.S. Revolving Loan Obligations and the Total
Canadian Exposure to the aggregate of all of the U.S. Commitments and the
Canadian Commitments.

         (d) If, on any day prior to the Termination Date, the Total Canadian
Exposure exceeds the aggregate of all of the Canadian Commitments by five
percent (5%) or more, then (i) the Canadian Agent shall give notice thereof to
the Canadian Borrower and the Canadian Lenders and (ii) within two (2) Business
Days thereafter, the Canadian Borrower shall repay or prepay Canadian

                                       42

<PAGE>   48

Revolving Loans (or provide Cover for Letter of Credit Liabilities relating to
Canadian Letters of Credit or Bankers' Acceptance Liabilities) in accordance
with this Agreement in an aggregate principal amount such that, after giving
effect thereto, the Total Canadian Exposure shall not exceed the aggregate of
all of the Canadian Commitments.

3.       Borrowings, Prepayments and Interest Options.

         3.1 Borrowings. The applicable Borrower shall give the applicable
Agent notice of each borrowing to be made hereunder as provided in Section 4.3
hereof and the applicable Agent shall promptly notify each applicable Lender of
such request. Not later than 2:00 p.m. Houston, Texas time (in the case of U.S.
Revolving Loans which are same day fundings), 11:00 a.m. Houston, Texas time
(in the case of U.S. Revolving Loans which are not same day fundings), 11:00
a.m. Toronto, Ontario time (in the case of Canadian Revolving Loans which are
not same day fundings and Bankers' Acceptances) or 1:00 p.m. Toronto, Ontario
time (in the case of Canadian Revolving Loans which are same day fundings) on
the date specified for each such borrowing hereunder, each applicable Lender
shall make available the amount of the Loan, if any, to be made by it on such
date and/or the proceeds of the acceptance and purchase of any Bankers'
Acceptances, if any, to be so accepted and purchased by it on such date to the
applicable Agent at its Principal Office, in immediately available funds, for
the account of the applicable Borrower. Such amounts received by the applicable
Agent will be held in an account maintained by the applicable Borrower with the
applicable Agent. The amounts so received by the applicable Agent shall,
subject to the terms and conditions of this Agreement, be made available to the
applicable Borrower by wiring or otherwise transferring, in immediately
available funds, such amount to an account designated by the applicable
Borrower and approved by the applicable Agent.

         3.2 Prepayments.

         (a) Optional Prepayments. Except as provided in Section 3.3 hereof,
each Borrower shall have the right to prepay, on any Business Day, in whole or
in part, without the payment of any premium, penalty or fee, any of the
Obligations (other than Obligations relating to Bankers' Acceptances) at any
time or from time to time, provided that the applicable Borrower shall give the
applicable Agent notice of each such prepayment as provided in Section 4.3
hereof. Each optional prepayment on a Loan shall be in an amount equal to an
integral multiple of $3,000,000 (in respect of Term Loans), $500,000 (in
respect of Revolving Loans denominated in Dollars) or C$500,000 (in respect of
Revolving Loans denominated in Canadian Dollars). Bankers' Acceptances may not
be prepaid. Such optional prepayments of Term Loans shall be applied ratably
(based on outstanding principal balances) to all Term Notes and shall be
applied to scheduled principal installments in inverse order of their
maturities.

         (b) Mandatory Prepayments and Cover. Except, in each case, as provided
in Section 3.3 hereof,



                                       43

<PAGE>   49

                  (1)      Insurance Proceeds and Condemnation Awards.

                           (i) Promptly following the receipt thereof by U.S.
                  Borrower or any of its Subsidiaries (other than Foreign
                  Subsidiaries), U.S. Borrower shall deposit or cause to be
                  deposited with U.S. Agent in an interest bearing account (but
                  without any obligation to maximize such interest) all of the
                  net cash proceeds of any payment or award in excess of
                  $500,000 made to any such Person under any policy of Property
                  insurance with respect to any Property owned by such Person
                  or pursuant to any condemnation award with respect to any
                  such Property; provided such amounts have not theretofore
                  been reasonably expended for the restoration or replacement
                  of the asset in respect of which such payment or award was
                  made. Such amounts shall be collaterally assigned to U.S.
                  Agent as security for the U.S. Obligations in a manner
                  reasonably acceptable to U.S. Agent. Upon delivery to U.S.
                  Agent of written certification by U.S. Borrower that the
                  applicable Obligor has reasonably expended amounts or
                  committed in writing to expend amounts for the restoration or
                  replacement of the asset in respect of which such payment or
                  award was made, specifying the amount expended or committed,
                  so long as no Default or Event of Default shall have occurred
                  and be continuing any such amount deposited with U.S. Agent
                  shall be released by U.S. Agent to U.S. Borrower; provided,
                  however, that, in the event that within 180 days of receipt
                  of such payment or award by U.S. Borrower, to the extent U.S.
                  Borrower shall not have actually spent or certified to U.S.
                  Agent its intention to expend a substantially equivalent
                  amount for the restoration or replacement of the asset in
                  respect of which such payment or award was made or to
                  purchase other assets that may be productively used in the
                  business of the U.S. Borrower or the applicable Subsidiary,
                  U.S. Borrower shall make a prepayment on the Term Loans
                  (using any funds deposited with U.S. Agent pursuant to this
                  Section 3.2(b)(1) or other funds) in the amount of the excess
                  of the amount of such payment or award over the amount of
                  such expenditures and/or commitment on such 180th day. Such
                  prepayment shall be applied to the Term Notes secured by the
                  applicable Collateral and shall be applied to scheduled
                  principal installments in inverse order of their maturities.

                           (ii) In cases where the amount of the net cash
                  proceeds of any payment or award is equal to or less than
                  $500,000 and no Default or Event of Default has occurred and
                  is continuing, such proceeds may be paid to any Obligor, and
                  if received by U.S. Agent shall be paid by U.S. Agent to U.S.
                  Borrower, for use in paying for replacements or repairs of or
                  substitutes for the damaged, destroyed or taken assets or in
                  a manner otherwise consistent with this Agreement.

                  (2) Excess Cash Flow. Within fifteen (15) Business Days after
         the delivery of the Annual Financial Statements pursuant to Section
         7.2 hereof with respect to the fiscal year of U.S. Borrower
         (commencing with the fiscal year ending on March 31, 1999), U.S.
         Borrower shall make a prepayment on the Term Loans in an amount equal
         to (i) Excess Cash



                                       44

<PAGE>   50

         Flow for such fiscal year times the Excess Cash Flow Percentage less
         (ii) optional prepayments made on the Term Loans during such fiscal
         year. Such prepayment shall be applied ratably to the Term Notes
         (based on outstanding principal balances) and shall be applied to
         scheduled principal installments in inverse order of their maturities.

                  (3) U.S. Borrowing Base. U.S. Borrower shall from time to
         time on demand by U.S. Agent prepay the U.S. Revolving Loans (or
         provide Cover for Letter of Credit Liabilities relating to U.S.
         Letters of Credit) in such amounts as shall be necessary so that at
         all times the aggregate outstanding amount of all U.S. Revolving Loan
         Obligations shall be less than or equal to the Maximum U.S. Available
         Amount.

                  (4) Canadian Borrowing Base. Canadian Borrower shall from
         time to time on demand by Canadian Agent prepay the Canadian Revolving
         Loans (or provide Cover for Letter of Credit Liabilities relating to
         Canadian Letters of Credit) in such amounts as shall be necessary so
         that at all times the aggregate outstanding amount of all Canadian
         Obligations shall be less than or equal to the Maximum Canadian
         Available Amount (provided, however, that for purposes of this clause
         (4), the Exchange Rate used for conversion of Canadian Dollars into
         Dollars shall be the Exchange Rate as of the most recently occurring
         Calculation Date).

                  (5) Sale of Assets. U.S. Borrower shall make the payments
         required by Section 8.4(c) hereof.

                  (6) Equity Proceeds. An amount equal to fifty percent (50%)
         of the net proceeds realized from the issuance of any equity
         securities by Group in connection with any public offering of
         securities shall be applied as a prepayment on the Term Loans
         concurrently with the receipt of such proceeds by Group. Such
         prepayment shall be applied ratably to the Term Notes (based on
         outstanding principal balances) and shall be applied to scheduled
         principal installments in inverse order of their maturities.

         (c) Term Loan Amortization. The principal of the Term Notes shall be
due and payable in quarterly installments, each due on a Quarterly Date,
beginning on March 31, 1999, equal to $1,160,714.29 (in the aggregate for all
Term Notes) and allocated among the Term Loan Lenders pro rata in accordance
with the unpaid principal balances of the Term Notes held by the Term Loan
Lenders. On the Term Loan Maturity Date, the entire unpaid principal balance of
each Term Note and all accrued and unpaid interest on the unpaid principal
balance of each Term Note shall be finally due and payable.

         (d) Interest Payments. Accrued and unpaid interest on the unpaid
principal balance of the Loans shall be due and payable on the Interest Payment
Dates.



                                       45

<PAGE>   51

         (e) Payments and Interest on Reimbursement Obligations. Each Borrower
will pay to the applicable Agent for the account of each applicable Lender the
amount of each Reimbursement Obligation owed by such Borrower. Such payment
shall be due on the date on which the applicable Agent notifies the applicable
Borrower of the date and amount of the applicable payment by an Issuer of any
drawing under a Letter of Credit or on the date of maturity of any Bankers'
Acceptance. The amount of any Reimbursement Obligation may, if the applicable
conditions precedent specified in Sections 5.1 and 5.2 hereof have been
satisfied, be paid with the proceeds of Loans or, in the case of Canadian
Obligations, of the acceptance and purchase or Bankers' Acceptances. Subject to
Section 11.7 hereof, each Borrower will pay to the applicable Agent for the
account of each applicable Lender interest on any Reimbursement Obligation at
(i) at the applicable Base Rate (with respect to Reimbursement Obligations
denominated in Dollars) or at the Canadian Prime Rate (with respect to
Reimbursement Obligations denominated in Canadian Dollars) plus the applicable
Margin Percentage from the date such Reimbursement Obligation arises until the
date five (5) Business Days thereafter and (ii) at the applicable Past Due Rate
thereafter until the same is paid in full.

         3.3 Interest Options

         (a) Options Available. The outstanding principal balance of the
Canadian Dollar Revolving Notes shall bear interest at the Canadian Prime Rate
and the outstanding principal balance of the other Notes shall bear interest at
the applicable Base Rate; provided, that (1) all past due amounts, both
principal and accrued interest, shall bear interest at the Past Due Rate, and
(2) subject to the provisions hereof, each Borrower shall have the option of
having all or any portion of the principal balances of its Notes (other than
the Canadian Dollar Revolving Notes) from time to time outstanding bear
interest at a Eurodollar Rate. The records of Agents and each of the Lenders
with respect to Interest Options, Interest Periods and the amounts of Loans to
which they are applicable shall be binding and conclusive, absent manifest
error. Interest on the amount of each advance against the Notes shall be
computed on the amount of that advance and from the date it is made.
Notwithstanding anything in this Agreement to the contrary, for the full term
of the Notes the interest rate produced by the aggregate of all sums paid or
agreed to be paid to the holders of the Notes for the use, forbearance or
detention of the debt evidenced thereby (including all interest on the Notes at
the Stated Rate plus the Additional Interest) shall not exceed the Ceiling
Rate.

         (b) Designation and Conversion. Each Borrower shall have the right to
designate or convert its Interest Options in accordance with the provisions
hereof. Provided no Event of Default has occurred and is continuing and subject
to the last sentence of Section 3.3(a) and the provisions of Section 3.3(c),
each Borrower may elect to have a Eurodollar Rate apply or continue to apply to
all or any portion of the principal balance of its Notes (other than the
Canadian Dollar Revolving Notes). Each change in Interest Options shall be a
conversion of the rate of interest applicable to the specified portion of the
Loans, but such conversion shall not change the respective outstanding
principal balances of the applicable Notes. The Interest Options shall be
designated or converted in the manner provided below:



                                       46

<PAGE>   52

         (i)      The applicable Borrower shall give the applicable Agent
                  telephonic notice, promptly confirmed by a Rate Designation
                  Notice (and the applicable Agent shall promptly inform each
                  applicable Lender thereof). Each such telephonic and written
                  notice shall specify the amount of the Loan and type (i.e.
                  U.S. Revolving Loan, Canadian Revolving Loan or Term Loan)
                  which is the subject of the designation, if any; the amount
                  of borrowings into which such borrowings are to be converted
                  or for which an Interest Option is designated; the proposed
                  date for the designation or conversion and the Interest
                  Period or Periods, if any, selected by the applicable
                  Borrower. Such telephonic notice shall be irrevocable and
                  shall be given to the applicable Agent no later than the
                  applicable Rate Designation Date.

         (ii)     No more than three (3) LIBOR Borrowings shall be in effect
                  with respect to the U.S. Revolving Loans at any time and no
                  more than three (3) LIBOR Borrowings shall be in effect with
                  respect to the Canadian Revolving Loans at any time. No more
                  than three (3) LIBOR Borrowings shall be in effect with
                  respect to the Term Loans at any time. No single LIBOR
                  Borrowing may include any combination of any two or more of
                  U.S. Revolving Loans, Canadian Revolving Loans and Term
                  Loans.

         (iii)    Each designation or conversion of a LIBOR Borrowing shall
                  occur on a LIBOR Business Day.

         (iv)     Except as provided in Section 3.3(c) hereof, no LIBOR
                  Borrowing may be converted to a Base Rate Borrowing or
                  another LIBOR Borrowing on any day other than the last day of
                  the applicable Interest Period.

         (v)      Each request for a LIBOR Borrowing shall be in the amount
                  equal to $500,000 or an integral multiple of $100,000 in
                  excess thereof.

         (vi)     Each designation of an Interest Option with respect to the
                  U.S. Revolving Notes shall apply to all of the U.S. Revolving
                  Notes ratably in accordance with their respective outstanding
                  principal balances. Each designation of an Interest Option
                  with respect to the Canadian Revolving Notes shall apply to
                  all of the Canadian Revolving Notes ratably in accordance
                  with their respective outstanding principal balances. Each
                  designation of an Interest Option with respect to the Term
                  Notes shall apply to all of the Term Notes ratably in
                  accordance with their respective outstanding principal
                  balances. If any Lender assigns an interest in any of its
                  Notes when any LIBOR Borrowing is outstanding with respect
                  thereto, then such assignee shall have its ratable interest
                  in such LIBOR Borrowing.

         (vii)    The entire outstanding principal balance of the Canadian
                  Dollar Revolving Notes shall bear interest at the Canadian
                  Prime Rate.



                                       47

<PAGE>   53

         (c)      Special Provisions Applicable to LIBOR Borrowings.

         (i) Options Unlawful. If the adoption of any applicable Legal
Requirement after the Effective Date or any change after the Effective Date in
any applicable Legal Requirement or in the interpretation or administration
thereof by any Governmental Authority or compliance by any Lender with any
request or directive (whether or not having the force of law) issued after the
Effective Date by any central bank or other Governmental Authority shall at any
time make it unlawful or impossible for any Lender to permit the establishment
of or to maintain any LIBOR Borrowing, the commitment of such Lender to
establish such LIBOR Borrowing shall forthwith be canceled and the applicable
Borrower shall forthwith, shall on the last day of the Interest Period relating
to any outstanding LIBOR Borrowing (or within such earlier period as may be
required by applicable law) (1) convert the LIBOR Borrowing of such Lender with
respect to which such demand was made to a Base Rate Borrowing; (2) pay all
accrued and unpaid interest to date on the amount so converted; and (3) pay any
amounts required to compensate each Lender for any additional cost or expense
which any Lender may incur as a result of such adoption of or change in such
Legal Requirement or in the interpretation or administration thereof and any
Funding Loss which any Lender may incur as a result of such conversion. If,
when any Agent so notifies any Borrower, such Borrower has given a Rate
Designation Notice specifying a LIBOR Borrowing but the selected Interest
Period has not yet begun, as to the applicable Lender such Rate Designation
Notice shall be deemed to be of no force and effect, as if never made, and the
balance of the Loans made by such Lender specified in such Rate Designation
Notice shall bear interest at the Base Rate until a different available
Interest Option shall be designated in accordance herewith.

         (ii) Increased Cost of Borrowings. Subject to Section 11.17, if the
adoption after the Effective Date of any applicable Legal Requirement or any
change after the Effective Date in any applicable Legal Requirement or in the
interpretation or administration thereof by any Governmental Authority or
compliance by any Lender with any request or directive (whether or not having
the force of law) issued after the Effective Date by any central bank or
Governmental Authority shall at any time as a result of any portion of the
principal balances of the Notes being maintained on the basis of a Eurodollar
Rate:

                  (1)      subject any Lender to any Taxes, or any deduction or
                           withholding for any Taxes, on or from any payment
                           due under any LIBOR Borrowing or other amount due
                           hereunder, other than income and franchise taxes of
                           the United States or its political subdivisions or
                           such other jurisdiction in which the applicable
                           Lender has its principal office or applicable
                           lending office; or

                  (2)      change the basis of taxation of payments due from
                           any Borrower to any Lender under any LIBOR Borrowing
                           (otherwise than by a change in the rate of taxation
                           of the overall net income of such Lender); or

                  (3)      impose, modify, increase or deem applicable any
                           reserve requirement (excluding that portion of any
                           reserve requirement included in the calculation



                                       48

<PAGE>   54


                           of the applicable Eurodollar Rate), special deposit
                           requirement or similar requirement (including, but
                           not limited to, state law requirements) against
                           assets of any Lender, or against deposits with any
                           Lender, or against loans made by any Lender, or
                           against any other funds, obligations or other
                           Property owned or held by any Lender; or

                  (4)      impose on any Lender any other condition regarding
                           any LIBOR Borrowing;

and the result of any of the foregoing is to increase the cost to any Lender of
agreeing to make or of making, renewing or maintaining such LIBOR Borrowing, or
reduce the amount of principal or interest received by any Lender, then, within
15 Business Days after demand by any Agent (accompanied by a statement setting
forth in reasonable detail the applicable Lender's basis therefor), the
applicable Borrower shall pay to the applicable Agent additional amounts which
shall compensate each Lender for such increased cost or reduced amount. The
determination by any Lender of the amount of any such increased cost, increased
reserve requirement or reduced amount shall be conclusive and binding, absent
manifest error. Each Borrower shall have the right, if it receives from any
Agent any notice referred to in this paragraph, upon three Business Days'
notice to the applicable Agent (which shall notify each affected Lender),
either (i) to repay in full (but not in part) any borrowing with respect to
which such notice was given, together with any accrued interest thereon, or
(ii) to convert the LIBOR Borrowing which is the subject of the notice to a
Base Rate Borrowing; provided, that any such repayment or conversion shall be
accompanied by payment of (x) the amount required to compensate each Lender for
the increased cost or reduced amount referred to in the preceding paragraph;
(y) all accrued and unpaid interest to date on the amount so repaid or
converted, and (z) any Funding Loss which any Lender may incur as a result of
such repayment or conversion. Each Lender will notify the applicable Borrower
through the applicable Agent of any event occurring after the date of this
Agreement which will entitle such Lender to compensation pursuant to this
Section as promptly as practicable after it obtains knowledge thereof and
determines to request such compensation, and (if so requested by the applicable
Borrower through the applicable Agent) will designate a different lending
office of such Lender for the applicable LIBOR Borrowing or will take such
other action as the applicable Borrower may reasonable request if such
designation or action is consistent with the internal policy of such Lender and
legal and regulatory restrictions, will avoid the need for, or reduce the
amount of, such compensation and will not, in the sole opinion of such Lender,
be disadvantageous to such Lender.

         (iii) Inadequacy of Pricing and Rate Determination. If, for any reason
with respect to any Interest Period, the applicable Agent (or, in the case of
clause 3 below, the applicable Lender) shall have determined (which
determination shall be conclusive and binding upon the applicable Borrower,
absent manifest error) that:

                  (1)      such Agent is unable through its customary general
                           practices to determine any applicable Eurodollar
                           Rate, or


                                       49

<PAGE>   55

                  (2)      by reason of circumstances affecting the applicable
                           market, generally, such Agent is not being offered
                           deposits in United States dollars in such market,
                           for the applicable Interest Period and in an amount
                           equal to the amount of any applicable LIBOR
                           Borrowing requested by the applicable Borrower, or

                  (3)      any applicable Eurodollar Rate will not adequately
                           and fairly reflect the cost to any Lender of making
                           and maintaining such LIBOR Borrowing hereunder for
                           any proposed Interest Period,

then the applicable Agent shall give the applicable Borrower notice thereof and
thereupon, (A) any Rate Designation Notice previously given by such Borrower
designating the applicable LIBOR Borrowing which has not commenced as of the
date of such notice from such Agent shall be deemed for all purposes hereof to
be of no force and effect, as if never given, and (B) until the applicable
Agent shall notify such Borrower that the circumstances giving rise to such
notice from such Agent no longer exist, each Rate Designation Notice requesting
the applicable Eurodollar Rate shall be deemed a request for a Base Rate
Borrowing, and any applicable LIBOR Borrowing then outstanding shall be
converted, without any notice to or from the applicable Borrower, upon the
termination of the Interest Period then in effect with respect to it, to a Base
Rate Borrowing.

         (iv) Funding Losses. Each Borrower shall indemnify each applicable
Lender against and hold each applicable Lender harmless from any Funding Loss
relating to Loans to such Borrower or relating to Bankers' Acceptances
requested by such Borrower. Subject to Section 11.17, this indemnity shall
survive the payment of the Notes. Within 15 Business Days after demand by any
Agent (accompanied by a certificate of the applicable Lender setting forth in
reasonable detail the amount and calculation of the amount claimed as to any
Funding Losses, which shall be conclusive and binding upon the applicable
Borrower, absent manifest error), the applicable Borrower shall pay to such
Agent, for the account of such Lender, the amount of such Funding Losses.

         (d) Funding Offices; Adjustments Automatic; Calculation Year. Any
Lender may, if it so elects, fulfill its obligation as to any LIBOR Borrowing
by causing a branch or affiliate of such Lender to make such Loan and may
transfer and carry such Loan at, to or for the account of any branch office or
affiliate of such Lender; provided, that in such event for the purposes of this
Agreement such Loan shall be deemed to have been made by such Lender and the
obligation of the applicable Borrower to repay such Loan shall nevertheless be
to such Lender and shall be deemed held by it for the account of such branch or
affiliate. Without notice to any Borrower or any other Person, each rate
required to be calculated or determined under this Agreement shall
automatically fluctuate upward and downward in accordance with the provisions
of this Agreement. Interest at the Canadian Prime Rate or any applicable Prime
Rate shall be computed on the basis of the actual number of days elapsed in a
year consisting of 365 or 366 days, as the case may be. All other interest
required to be calculated or determined under this Agreement shall be computed
on the basis of the actual number of days elapsed in a year consisting of 360
days, unless the Ceiling Rate would thereby be exceeded, in which event, to the
extent necessary to avoid exceeding the Ceiling Rate,


                                       50

<PAGE>   56

the applicable interest shall be computed on the basis of the actual number of
days elapsed in the applicable calendar year in which accrued.

         (e) Funding Sources. Notwithstanding any provision of this Agreement
to the contrary, each Lender shall be entitled to fund and maintain its funding
of all or any part of the Loans in any manner it sees fit, it being understood,
however, that for the purposes of this Agreement all determinations hereunder
shall be made as if each Lender had actually funded and maintained each LIBOR
Borrowing during each Interest Period through the purchase of deposits having a
maturity corresponding to such Interest Period and bearing an interest rate
equal to the Eurodollar Rate for such Interest Period.

4.       Payments; Pro Rata Treatment; Computations, Etc.

         4.1 Payments.

         (a) Except to the extent otherwise provided herein, all payments of
principal, interest, Reimbursement Obligations and other amounts to be made by
any Borrower hereunder, under the Notes and under the other Loan Documents
shall be made in (i) with respect to Bankers' Acceptance Liabilities and
Canadian Prime Loans, Canadian Dollars and (ii) in all other cases, in Dollars,
in immediately available funds, to the applicable Agent at its Principal Office
(or in the case of a successor U.S. Agent, at the principal office of such
successor U.S. Agent in the United States or in the case of a successor
Canadian Agent, at the principal office of such successor Canadian Agent in
Canada), not later than 11:00 a.m. Houston, Texas time (in the case of any
payment by the U.S. Borrower) or 12:00 noon Toronto, Ontario time (in the case
of any payment by the Canadian Borrower) on the date on which such payment
shall become due (each such payment made after such time on such due date to be
deemed to have been made on the next succeeding Business Day).

         (b) Each Borrower shall, at the time of making each payment hereunder,
under any Note or under any other Loan Document, specify to the applicable
Agent the Obligations payable by such Borrower hereunder or thereunder to which
such payment is to be applied. Each payment received by any Agent hereunder,
under any Note or under any other Loan Document for the account of a Lender
shall be paid promptly to such Lender, in immediately available funds. If any
Agent fails to send to any Lender the applicable amount by the close of
business on the date any such payment is received by such Agent if such payment
is received prior to 11:00 a.m. Houston, Texas time (in the case of any payment
to a U.S. Lender) or 12:00 noon Toronto, Ontario time (in the case of any
payment to a Canadian Lender) (or on the next succeeding Business Day with
respect to payments which are received after such time), such Agent shall pay
to the applicable Lender interest on such amount from such date at a rate of
interest per annum equal to (i) in respect of Obligations which are denominated
in Dollars, the Federal Funds Rate and (ii) in respect of Canadian Obligations
which are denominated in Canadian Dollars, the CDOR Rate. Borrowers, Lenders
and Agents acknowledge and agree that this provision and each other provision
of this Agreement or any of the other Loan Documents relating to the
application of amounts in payment of the Obligations shall be subject to



                                       51

<PAGE>   57

the provisions of Section 4.2(d) regarding pro rata application of amounts
after an Event of Default shall have occurred and be continuing.

         (c) If the due date of any payment hereunder or under any other Loan
Document falls on a day which is not a Business Day, the due date for such
payments (except as otherwise provided in clause (2) of the definition of
"Interest Period") shall be extended to the next succeeding Business Day and
interest shall be payable for any principal so extended for the period of such
extension.

         (d) All payments by any Borrower hereunder or under any other Loan
Document shall be made free and clear of and without deduction for or on
account of any present or future income, stamp, or other taxes, fees, duties,
withholding or other charges of any nature whatsoever imposed by any taxing
authority excluding in the case of each Agent, each Issuer and each Lender
taxes imposed on or measured by its net income or franchise taxes imposed by
the jurisdiction in which it is organized or through which it acts for purposes
of this Agreement (such non-excluded items being hereinafter referred to as
"Taxes"). If as a result of any change in law (or the interpretation thereof)
after the date that the applicable Agent, the applicable Issuer or the
applicable Lender became a party to this Agreement any withholding or deduction
from any payment to be made to, or for the account of, such Person by any
Borrower hereunder or under any other Loan Document is required in respect of
any Taxes pursuant to any applicable law, rule, or regulation, then such
Borrower will (i) pay to the relevant authority the full amount required to be
so withheld or deducted; (ii) to the extent available, promptly forward to the
applicable Agent an official receipt or other documentation reasonably
satisfactory to such Agent evidencing such payment to such authority; and (iii)
pay to the applicable Agent, for the account of each affected Person, such
additional amount or amounts as are necessary to ensure that the net amount
actually received by such Person will equal the full amount such Lender would
have received had no such withholding or deduction been required. Each such
Person shall determine such additional amount or amounts payable to it (which
determination shall, in the absence of manifest error, be conclusive and
binding on each Borrower). If any Agent, any Issuer or any Lender becomes aware
that any such withholding or deduction from any payment to be made by any
Borrower hereunder or under any other Loan Document is required, then such
Person shall promptly notify the applicable Agent and the applicable Borrower
thereof stating the reasons therefor and the additional amount required to be
paid under this Section. Each Lender shall execute and deliver to the
applicable Agent and the applicable Borrower such forms as it may be required
to execute and deliver pursuant to Section 11.13 hereof. To the extent that any
such withholding or deduction results from the failure of a Lender to provide a
form required by Section 11.13 hereof (unless such failure is due to some
prohibition under applicable Legal Requirements), the applicable Borrower shall
have no obligation to pay the additional amount required by clause (iii) above.
Anything in this Section notwithstanding, if any Lender elects to require
payment by any Borrower of any material amount under this Section, the
applicable Borrower may, within 60 days after the date of receiving notice
thereof and so long as no Default shall have occurred and be continuing, elect
to terminate such Lender as a party to this Agreement; provided that,
concurrently with such termination the applicable Borrower shall (i) if the
Agents and each of the other Lenders shall consent, pay that Lender all
principal, interest and fees and other amounts owed to such Lender through such
date of termination or (ii) have arranged for another



                                       52

<PAGE>   58

financial institution approved by the Agents (such approval not to be
unreasonably withheld or delayed) as of such date, to become a substitute
Lender for all purposes under this Agreement in the manner provided in Section
11.6; provided further that, prior to substitution for any Lender, the
applicable Borrower shall have given written notice to the Agents of such
intention and the Lenders shall have the option, but no obligation, for a
period of 60 days after receipt of such notice, to increase their U.S.
Commitments or Canadian Commitments, as the case may be, in order to replace
the affected Lender in lieu of such substitution.

         4.2 Pro Rata Treatment. Except to the extent otherwise provided
herein: (a) each borrowing from the Lenders under Section 2.1 hereof shall be
made (x) in the case of Canadian Revolving Loans, ratably from the Canadian
Lenders in accordance with their respective Canadian Commitments, (y) in the
case of U.S. Revolving Loans, ratably from the U.S. Lenders in accordance with
their respective U.S. Commitments and (z) in the case of Term Loans, ratably
from the Term Loan Lenders in accordance with the amounts set forth opposite
their signature lines hereto under the heading "Term Loans"; (b) each payment
of commitment fees shall be made for the account of the Lenders, and each
termination or reduction of the U.S. Commitments or Canadian Commitments of the
Lenders under Section 2.3 hereof shall be applied, pro rata, according to the
Lenders' respective U.S. Commitments or Canadian Commitments, as the case may
be; (c) each payment by any Borrower of principal of or interest on the Term
Loans, Canadian Revolving Loans, U.S. Revolving Loans or any Bankers'
Acceptance, as the case may be, prior to the occurrence of an Event of Default
(or after the applicable Event of Default shall have been fully cured or
waived) shall be made to the applicable Agent for the account of the applicable
Lenders pro rata in accordance with the respective unpaid principal amounts of
the Term Loans, Canadian Revolving Loans or U.S. Revolving Loans (as the case
may be) held by or Bankers' Acceptances accepted by such Lenders; (d) each
payment by any Borrower of principal of or interest on the Term Loans, Canadian
Revolving Loans, U.S. Revolving Loans or any Bankers' Acceptance, as the case
may be, while an Event of Default shall have occurred and be continuing, shall
be made to the applicable Agent for the account of the Lenders pro rata in
accordance with the respective unpaid principal amounts of the Obligations held
by the Lenders (i.e. such payments shall be shared by all of the Lenders and
not restricted to the holders of U.S. Revolving Notes, Canadian Revolving
Notes, Canadian Dollar Notes or Term Notes, or Lenders having accepted Bankers'
Acceptances, as the case may be, regardless of any attempted contrary
designation by any Borrower), and (e) the applicable Lenders (other than the
applicable Issuer) shall purchase from the applicable Issuer participations in
each Letter of Credit to the extent of their respective U.S. Commitment
Percentages or Canadian Commitment Percentages, as the case may be.

         4.3 Certain Actions, Notices, Etc. Notices to the applicable Agent of
any termination or reduction of U.S. Commitments or Canadian Commitments, as
the case may be, and of borrowings and optional prepayments of Loans and
requests for issuances of Letters of Credit shall be irrevocable and shall be
effective only if received by the applicable Agent not later than 10:00 a.m.
Houston, Texas time (in the case of U.S. Revolving Loans



                                       53

<PAGE>   59

which are same day fundings), 11:00 a.m. Houston, Texas time (in the case of
U.S. Revolving Loans which are not same day fundings and U.S. Letters of
Credit), 12:00 noon Toronto, Ontario time (in the case of Canadian Revolving
Loans which are not same day fundings, Bankers' Acceptances and Canadian
Letters of Credit) or 10:00 a.m. Toronto, Ontario time (in the case of Canadian
Revolving Loans which are same day fundings) on the number of Business Days
prior to the date of the relevant termination, reduction, borrowing and/or
prepayment specified below:

<TABLE>
<CAPTION>
                                                                       Number of Business Days
                                                                             Prior Notice
                                                                             ------------

<S>                                                                    <C>
                  Section 2.4(c) Reallocations                                  10



                  Termination or Reduction of U.S.
                  Commitments or Canadian Commitments                           5

                  U.S. Revolving Loan or Canadian
                  Revolving Loan repayment                                      same day

                  Base Rate Borrowings                                          same day
                  and Canadian Prime Loans

                  Letter of Credit issuance                                     2

                  Prepayments required pursuant to
                  Section 3.2(b)                                                same day

                  Optional prepayment of
                  Term Loan                                                     5

                  Selection of a Eurodollar Rate                                3 LIBOR
                                                                                Business Days


                  Bankers' Acceptances                                          2
</TABLE>

Each such notice of termination or reduction shall specify the amount of the
applicable U.S. Commitment or Canadian Commitment to be terminated or reduced.
Each such notice of borrowing or prepayment shall specify the amount of the
Loans to be borrowed or prepaid and the date of borrowing or prepayment (which
shall be a Business Day). The applicable Agent shall promptly notify the
affected Lenders of the contents of each such notice.

         4.4 Non-Receipt of Funds by Any Agent. Unless the applicable Agent
shall have been notified by a Lender or a Borrower (the "Payor") prior to the
date on which such Lender is to make payment to such Agent of the proceeds of a
Loan (or funding of a drawing under a Letter of Credit or reimbursement with
respect to any drawing under a Letter of Credit or funding of a payment under a
Bankers' Acceptance or reimbursement with respect to any payment under


                                       54

<PAGE>   60

a Bankers' Acceptance) to be made by it hereunder or the applicable Borrower is
to make a payment to such Agent for the account of one or more of the Lenders,
as the case may be (such payment being herein called the "Required Payment"),
which notice shall be effective upon receipt, that the Payor does not intend to
make the Required Payment to such Agent, the applicable Agent may assume that
the Required Payment has been made and may, in reliance upon such assumption
(but shall not be required to), make the amount thereof available to the
intended recipient on such date and, if the Payor has not in fact made the
Required Payment to such Agent, the recipient of such payment (or, if such
recipient is the beneficiary of a Letter of Credit, the applicable Borrower
and, if such Borrower fails to pay the amount thereof to the applicable Agent
forthwith upon demand, the applicable Lenders ratably in proportion to their
respective Commitment Percentages) shall, on demand, pay to such Agent the
amount made available by such Agent, together with interest thereon in respect
of the period commencing on the date such amount was so made available by such
Agent until the date Agent recovers such amount at a rate per annum for such
period equal to (i) in respect of Obligations which are denominated in Dollars,
the Federal Funds Rate and (ii) in respect of Canadian Obligations which are
denominated in Canadian Dollars, the CDOR Rate.

         4.5 Sharing of Payments, Etc. If a Lender shall obtain payment of any
principal of or interest on any Loan made by it under this Agreement, on any
Reimbursement Obligation or on any other Obligation then due to such Lender
hereunder, through the exercise of any right of set-off (including, without
limitation, any right of setoff or Lien granted under Section 9.2 hereof),
banker's lien, counterclaim or similar right, or otherwise, it shall promptly
purchase from the other Lenders participations in the Loans made, or
Reimbursement Obligations or other Obligations held, by the other Lenders in
such amounts, and make such other adjustments from time to time as shall be
equitable to the end that all the Lenders shall share the benefit of such
payment (net of any expenses which may be incurred by such Lender in obtaining
or preserving such benefit) pro rata in accordance with the unpaid Obligations
then due to each of them. To such end all the Lenders shall make appropriate
adjustments among themselves (by the resale of participations sold or
otherwise) if such payment is rescinded or must otherwise be restored. Each
Borrower agrees, to the fullest extent it may effectively do so under
applicable law, that any Lender so purchasing a participation in the Loans
made, or Reimbursement Obligations or other Obligations held, by other Lenders
may exercise all rights of set-off, bankers' lien, counterclaim or similar
rights with respect to such participation as fully as if such Lender were a
direct holder of Loans, Reimbursement Obligations or other Obligations in the
amount of such participation. Nothing contained herein shall require any Lender
to exercise any such right or shall affect the right of any Lender to exercise,
and retain the benefits of exercising, any such right with respect to any other
indebtedness or obligation of any Borrower.

5.       Conditions Precedent.

         5.1 Initial Loans, Letters of Credit and Bankers' Acceptances. The
obligation of each Lender or each Issuer to make its initial Loans or issue or
participate in the initial Letter of Credit hereunder or to accept and purchase
its initial Bankers' Acceptance hereunder (whichever shall first


                                       55

<PAGE>   61

occur) is subject to the following conditions precedent, each of which shall
have been fulfilled or waived to the satisfaction of Agents:

         (a) Authorization and Status. Agents shall have received (i) copies of
the Organizational Documents of each Obligor certified as true and correct by
its secretary, assistant secretary or other equivalent officer, (ii) evidence
reasonably satisfactory to Agents of all action taken by each Obligor
authorizing the execution, delivery and performance of the Loan Documents and
all other documents related to this Agreement to which it is a party
(including, without limitation, a certificate of the secretary, assistant
secretary or other equivalent officer of each such party which is a corporation
setting forth the resolutions of its Board of Directors authorizing the
transactions contemplated thereby), and (iii) such certificates as may be
appropriate to demonstrate the qualification and good standing of each Obligor
in the jurisdiction of its organization and in each other jurisdiction where
the failure in which to qualify could reasonably be expected to have a Material
Adverse Effect.

         (b) Incumbency. Each Obligor shall have delivered to Agents a
certificate in respect of the name and signature of each of the officers (i)
who is authorized to sign on its behalf the applicable Loan Documents to which
it is a party related to any Loan, the issuance of any Letter of Credit or the
acceptance of any Bankers' Acceptance and (ii) who will, until replaced by
another officer or officers duly authorized for that purpose, act as its
representative for the purposes of signing documents and giving notices and
other communications in connection with any Loan, the issuance of any Letter of
Credit or the acceptance of any Bankers' Acceptance. Each Agent and each Lender
may conclusively rely on such certificates until they receive notice in writing
from the applicable Obligor to the contrary.

         (c) Notes. Agents shall have received the appropriate Notes of
Borrowers for each Lender, duly completed and executed.

         (d) Loan Documents. Each Obligor shall have duly executed and
delivered the Loan Documents to which it is a party (in such number of copies
as Agents shall have requested). Each such Loan Document shall be in
substantially the form furnished to the Lenders prior to their execution of
this Agreement, together with such changes therein as Agents may approve.

         (e) Security Matters. All such action as Agents shall have requested
to perfect the Liens created pursuant to the Security Documents which are in
effect as of the Effective Date shall have been taken, including, without
limitation, where applicable, the filing and recording of the Security
Documents with the appropriate Governmental Authorities. Agent shall also have
received evidence satisfactory to it that the Liens created by the Security
Documents constitute first priority Liens, except for the exceptions expressly
provided for herein or therein, including, without limitation, delivery of all
applicable stock certificates (with stock powers executed in blank), Uniform
Commercial Code search reports and other applicable personal property registry
reports, satisfactory title evidence in form and substance acceptable to Agent,
and executed releases of any prior Liens (except as permitted by Section 8.2).



                                       56

<PAGE>   62

         (f) Fees and Expenses. Borrowers shall have paid to Agents all unpaid
fees in the amounts previously agreed upon in writing between any Borrower and
any Agent.

         (g) Insurance. Borrowers shall have delivered to Agents certificates
of insurance satisfactory to Agents evidencing the existence of all insurance
required to be maintained by each Obligor by this Agreement and the Security
Documents.

         (h) Opinions of Counsel. Agents shall have received such opinions of
counsel to Obligors as Agents shall reasonably request with respect to Obligors
and the Loan Documents.

         (i) Consents. Agents shall have received evidence satisfactory to the
Majority Lenders that all material consents of each Governmental Authority and
of each other Person, if any, reasonably required in connection with (a) the
Loans, Letters of Credit and Bankers' Acceptances and (b) the execution,
delivery and performance of this Agreement and the other Loan Documents have
been satisfactorily obtained.

         (j) Key Agreements. Agents shall have received copies of the Key
Agreements, in Proper Form, and, where applicable, shall have received evidence
satisfactory to Agents that the transactions contemplated therein have been
consummated, subject only to the requested funding hereunder. Upon request of
Agents or the Majority Lenders, the copies of any designated Key Agreements
shall be certified as true, correct and complete by the applicable Borrower.

         (k) Payment of Certain Outstanding Indebtedness. Agents shall have
received evidence satisfactory to Agents that all existing Indebtedness owing
under the credit facility previously provided to Canadian Borrower by BNS shall
have been paid in full (or will be paid in full out of the initial advance
hereunder) and that all rights to further advances under such facility shall
have been terminated.

         (l) Purchase Agreement. Agents shall have received evidence
satisfactory to the Majority Lenders that, concurrently with the initial
advance made hereunder, the acquisition contemplated by the Purchase Agreement
shall be consummated.

         (m) Merger of NATCO Holdings. Agents shall have received evidence
satisfactory to the Majority Lenders that NATCO Holdings, Inc., a Delaware
corporation, shall have been merged into Group.

         (n) Equity. Borrower shall have received not less than $5,250,000 in
net proceeds from the sale of equity interests in Borrower.

         (o) Other Documents. Agents shall have received such other documents
consistent with the terms of this Agreement and relating to the transactions
contemplated hereby as Agents may reasonably request.



                                       57

<PAGE>   63

         5.2 All Loans, Letters of Credit and Bankers' Acceptances. The
obligation of each Lender to make any Loan to be made by it hereunder or to
issue or participate in any Letter of Credit or to accept and purchase any
Bankers' Acceptance is subject to (a) the accuracy, in all material respects,
on the date of such Loan or such issuance or such acceptance and purchase of
all representations and warranties of each Obligor contained in this Agreement
and the other Loan Documents; (b) the applicable Agent shall have received the
following, all of which shall be duly executed and in Proper Form: (1) a
Request for Extension of Credit as to the Loan, Letter of Credit or Bankers'
Acceptance, as the case may be, by the time and on the Business Day specified
under Section 4.3 hereof, (2) in the case of a Letter of Credit, an
Application, and (3) such other documents as the applicable Agent may
reasonably require; (c) prior to the making of such Loan or the issuance of
such Letter of Credit or the acceptance and purchase of such Bankers'
Acceptance, there shall have occurred no event which could reasonably be
expected to have a Material Adverse Effect; (d) no Default or Event of Default
shall have occurred and be continuing, and (e) the making of such Loan or the
issuance of such Letter of Credit or the acceptance and purchase of such
Bankers' Acceptance shall not be illegal or prohibited by any Legal
Requirement. The submission by any Borrower of a Request for Extension of
Credit shall be deemed to be a representation and warranty that the conditions
precedent to the applicable Loan or Letter of Credit or Bankers' Acceptance
have been satisfied.

6.       Representations and Warranties.

         To induce Agents, the Issuers and the Lenders to enter into this
Agreement and to make the Loans and issue or participate in the Letters of
Credit and accept and purchase Bankers' Acceptances, U.S. Borrower and Canadian
Borrower each represents and warrants (such representations and warranties to
survive any investigation and the making of the Loans and the issuance of any
Letters of Credit and the acceptance and purchase of any Bankers' Acceptances)
to the Lenders, Issuers and Agents as follows:

         6.1 Organization. Each Obligor (a) is duly organized, validly existing
and in good standing under the laws of the jurisdiction of its organization;
(b) has all necessary power and authority to conduct its business as presently
conducted, and (c) is duly qualified to do business and in good standing in the
jurisdiction of its organization and in all jurisdictions in which the failure
to so qualify could reasonably be expected to have a Material Adverse Effect.

         6.2 Financial Statements. Borrowers have furnished to Agents (i)
audited consolidated financial statements (including a balance sheet) as to
U.S. Borrower, Canadian Borrower and Group which fairly present in all material
respects, in accordance with GAAP, the consolidated financial condition and the
results of operations of such Persons as at the end of the fiscal year ended
March 31, 1998, (ii) audited financial statements (including a balance sheet)
as to The Cynara Company which, to the best knowledge of Borrowers, fairly
present in all material respects, in accordance with GAAP, the consolidated
financial condition and the results of operations of The Cynara Company as at
the end of the fiscal year ended December 31, 1997, (iii) unaudited
consolidating financial statements (including a balance sheet) as to U.S.
Borrower and Canadian Borrower which fairly



                                       58

<PAGE>   64

present in all material respects, in accordance with GAAP, the consolidating
financial condition and the results of operations of such Persons, on a
consolidating basis, as at the end of the fiscal year ended March 31, 1998,
(iv) unaudited consolidated financial statements (including a balance sheet) as
to U.S. Borrower, Canadian Borrower and Group which fairly present in all
material respects, in accordance with GAAP, the consolidated financial
condition and the results of operations of such Persons as at the end of the
fiscal quarter ended June 30, 1998 and (v) unaudited financial statements
(including a balance sheet) as to The Cynara Company which, to the best
knowledge of Borrowers, fairly present in all material respects, in accordance
with GAAP, the consolidated financial condition and the results of operations
of The Cynara Company as at the end of the fiscal quarter ended June 30, 1998.
No events, conditions or circumstances have occurred from the date that the
financial statements were delivered to Agent through the Effective Date which
would cause said financial statements to be misleading in any material respect.
Except for the Purchase Agreement, this Agreement and the other Loan Documents,
there are no material instruments or liabilities which should be reflected in
such financial statements provided to Agent which are not so reflected.

         6.3 Enforceable Obligations; Authorization. The Loan Documents to
which the applicable Obligors are parties are legal, valid and binding
obligations of each applicable Obligor, enforceable in accordance with their
respective terms, except as may be limited by bankruptcy, insolvency and other
similar laws and judicial decisions affecting creditors' rights generally and
by general equitable principles. The execution, delivery and performance of the
Loan Documents by the respective Obligors (a) have all been duly authorized by
all necessary action; (b) are within the power and authority of each applicable
Obligor; (c) do not and will not contravene or violate any Legal Requirement
applicable to any applicable Obligor or the Organizational Documents of any
applicable Obligor, the contravention or violation of which could reasonably be
expected to have a Material Adverse Effect; (d) do not and will not result in
the breach of, or constitute a default under, any material agreement or
instrument by which any Obligor or any of its Property may be bound, and (e) do
not and will not result in the creation of any Lien upon any Property of any
Obligor, except in favor of Agents as expressly contemplated herein or therein.
All necessary permits, registrations and consents for such making and
performance have been obtained. Except as otherwise expressly stated in the
Security Documents, the Liens of the Loan Documents will constitute valid and
perfected first and prior Liens on the Property described therein, subject to
no other Liens whatsoever except Permitted Liens.

         6.4 Other Debt. No Obligor is in default in the payment of any other
Indebtedness or under any agreement, mortgage, deed of trust, security
agreement or lease to which it is a party and which default could reasonably be
expected to have a Material Adverse Effect.

         6.5 Litigation. There is no litigation or administrative proceeding,
to the knowledge of any executive officer of any Borrower, pending or
threatened against, nor any outstanding judgment, order or decree against, any
Obligor before or by any Governmental Authority which does or could reasonably
be expected to have a Material Adverse Effect. No Obligor is in default with
respect to any judgment, order or decree of any Governmental Authority where
such default could reasonably be expected to have a Material Adverse Effect.



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         6.6 Title. Each Obligor has good and marketable title to the
Collateral, if any, pledged (or purported to be pledged) by such Obligor
pursuant to the Security Documents, free and clear of all Liens (except
Permitted Liens).

         6.7 Taxes. Each Obligor has filed all tax returns required to have
been filed and paid all taxes shown thereon to be due, except those for which
extensions have been obtained and those which are being contested in good faith
or where the failure to make required filings or pay required taxes could not
reasonably be expected to have a Material Adverse Effect..

         6.8 Regulations U and X. None of the proceeds of any Loan or proceeds
from the acceptance and purchase of Bankers' Acceptances will be used for the
purpose of purchasing or carrying directly or indirectly any margin stock or
for any other purpose that would constitute this transaction a "purpose credit"
within the meaning of Regulations U and X of the Board of Governors of the
Federal Reserve System, as any of them may be amended from time to time.

         6.9 Subsidiaries. As of the Effective Date, U.S. Borrower has no
Subsidiaries other than as set forth on Exhibit L hereto. The percentage of the
issued and outstanding equity interests in each applicable Subsidiary which is
owned by U.S. Borrower or one or more of its Subsidiaries is set forth on
Exhibit L hereto.

         6.10 No Untrue or Misleading Statements. No document, instrument or
other writing furnished to the Lenders by or on behalf of any Obligor in
connection with the transactions contemplated in any Loan Document contains any
untrue material statement of fact or omits to state any such fact necessary to
make the representations, warranties and other statements contained herein or
in such other document, instrument or writing not misleading in any material
respect.

         6.11 ERISA. With respect to each Plan, each Borrower and each member
of the Controlled Group have fulfilled their obligations, including obligations
under the minimum funding standards of ERISA and the Code and are in compliance
in all material respects with the provisions of ERISA and the Code. No event
has occurred which could result in a liability of any Borrower or any member of
the Controlled Group to the PBGC or a Plan (other than to make contributions in
the ordinary course) that could reasonably be expected to have a Material
Adverse Effect. There have not been any nor are there now existing any events
or conditions that would cause the Lien provided under Section 4068 of ERISA to
attach to any Property of any Borrower or any member of the Controlled Group.
The aggregate Unfunded Liabilities in respect of all Plans as of the date
hereof do not exceed $1,000,000. No "prohibited transaction" has occurred with
respect to any Plan.

         6.12 Investment Company Act. No Obligor is an investment company
within the meaning of the Investment Company Act of 1940, as amended, or,
directly or indirectly, controlled by or acting on behalf of any Person which
is an investment company, within the meaning of said Act.

         6.13 Public Utility Holding Company Act. No Obligor is an "affiliate"
or a "subsidiary company" of a "public utility company," or a "holding
company," or an "affiliate" or a "subsidiary


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<PAGE>   66

company" of a "holding company," as such terms are defined in the Public
Utility Holding Company Act of 1935, as amended.

         6.14 Solvency. None of U.S. Borrower, Canadian Borrower, any other
Obligor, U.S. Borrower and its Subsidiaries, on a consolidated basis, or
Canadian Borrower and its Subsidiaries, on a consolidated basis, is
"insolvent," as such term is used and defined in (i) the Bankruptcy Code and
(ii) the fraudulent conveyance statutes of the State of Texas or of any
jurisdiction in which any of the Collateral may be located.

         6.15 Fiscal Year. The fiscal year of each Obligor currently ends on
March 31, but prior to December 31, 1998, the fiscal year end of each of the
Obligors will be changed to December 31.

         6.16 Compliance. Each Obligor is in compliance with all Legal
Requirements applicable to it, except to the extent that the failure to comply
therewith could not reasonably be expected to have a Material Adverse Effect.

         6.17 Environmental Matters. Each Obligor has, to the best knowledge of
their respective executive officers, obtained and maintained in effect all
Environmental Permits (or the applicable Person has initiated the necessary
steps to transfer the Environmental Permits into its name or obtain such
permits), the failure to obtain which could reasonably be expected to have a
Material Adverse Effect. Each Obligor and its Properties, business and
operations have been and are, to the best knowledge of their respective
executive officers, in compliance with all applicable Requirements of
Environmental Law and Environmental Permits the failure to comply with which
could reasonably be expected to have a Material Adverse Effect. Each Obligor
and its Properties, business and operations are not subject to any (A)
Environmental Claims or (B), to the best knowledge of their respective
executive officers (after making reasonable inquiry of the personnel and
records of their respective Corporations), Environmental Liabilities, in either
case direct or contingent, arising from or based upon any act, omission, event,
condition or circumstance occurring or existing on or prior to the date hereof
which could reasonably be expected to have a Material Adverse Effect. None of
the officers of any Obligor has received any notice of any violation or alleged
violation of any Requirements of Environmental Law or Environmental Permit or
any Environmental Claim in connection with its Properties, liabilities,
condition (financial or otherwise), business or operations which could
reasonably be expected to have a Material Adverse Effect. Neither U.S. Borrower
nor Canadian Borrower knows of any event or condition with respect to currently
enacted Requirements of Environmental Laws presently scheduled to become
effective in the future with respect to any of the Properties of any Obligor
which could reasonably be expected to have a Material Adverse Effect, for which
the applicable Obligor has not made good faith provisions in its business plan
and projections of financial performance.

         6.18 Collateral Covered. As of the Effective Date, the Collateral
covered by the Security Documents constitutes substantially all material
personal Property owned by U.S. Borrower and its Subsidiaries and all of the
issued and outstanding equity interests in all of the Subsidiaries of U.S.




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Borrower owned by U.S. Borrower or any of its Subsidiaries (with the Collateral
being allocated between Canadian Obligations and U.S. Obligations as herein
provided).

7.       Affirmative Covenants.

         U.S. Borrower and Canadian Borrower each covenants and agrees with
Agents and the Lenders that prior to the termination of this Agreement it will
do or cause to be done, and cause each other Obligor (unless limited by the
language of the applicable provision to less than all of the Obligors) to do or
cause to be done, each and all of the following:

         7.1 Taxes, Existence, Regulations, Property, Etc. At all times, except
where failure or noncompliance could not reasonably be expected to have a
Material Adverse Effect: (a) pay when due all taxes and governmental charges of
every kind upon it or against its income, profits or Property, unless and only
to the extent that the same shall be contested diligently in good faith and
adequate reserves in accordance with GAAP have been established therefor; (b)
do all things necessary to preserve its existence, qualifications, rights and
franchises; (c) comply with all applicable Legal Requirements (including
without limitation Requirements of Environmental Law) in respect of the conduct
of its business and the ownership of its Property; and (d) cause its Property
to be protected, maintained and kept in good repair and make all replacements
and additions to such Property as may be reasonably necessary to conduct its
business properly and efficiently.

         7.2 Financial Statements and Information. Furnish to Agents and each
Lender each of the following: (a) as soon as available and in any event within
120 days after the end of each applicable fiscal year, beginning with the
fiscal year ending on December 31, 1998, Annual Financial Statements of U.S.
Borrower, Canadian Borrower and Group; (b) as soon as available and in any
event within 45 days after the end of each fiscal quarter of each applicable
fiscal year, Quarterly Financial Statements of U.S. Borrower, Canadian Borrower
and Group; (c) concurrently with the financial statements provided for in
Subsections 7.2(a) and (b) hereof, such schedules, computations and other
information, in reasonable detail, as may be reasonably required by Agents to
demonstrate compliance with the covenants set forth herein or reflecting any
non-compliance therewith as of the applicable date, all certified and signed by
a duly authorized officer of U.S. Borrower as true and correct in all material
respects to the best knowledge of such officer and, commencing with the
quarterly financial statement prepared as of September 30, 1998, a compliance
certificate ("Compliance Certificate") substantially in the form of Exhibit F
hereto, duly executed by such authorized officer; (d) by June 30 of each fiscal
year, U.S. Borrower's and Canadian Borrower's annual business plans for the
next fiscal year (including their proforma balance sheets and income and cash
flow projections for such fiscal year); (e) promptly upon their becoming
publicly available, each financial statement, report, notice or definitive
proxy statements sent by any Obligor to shareholders generally and each regular
or periodic report and each registration statement, prospectus or written
communication (other than transmittal letters) in respect thereof filed by any
Obligor with, or received by any Obligor in connection therewith from, any
securities exchange or the Securities and Exchange Commission or any successor
agency; (f) (1) as of the Effective Date and (2) within 20 days after (i) the
end of each calendar month or (ii) receipt of a request therefor (which may be


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given from time to time) from any Agent, a U.S. Borrowing Base Certificate and
a Canadian Borrowing Base Certificate as at the Effective Date or the last day
of such calendar month or the date of such receipt, as the case may be,
together with such supporting information as any Agent may reasonably request;
(g) within 30 days after (i) the end of each calendar quarter or (ii) receipt
of a request therefor (which may be given from time to time) from any Agent,
(1) a listing and aging of the Accounts of (x) U.S. Borrower and its
Subsidiaries (other than Canadian Subsidiaries) and (y) the Canadian
Subsidiaries as of the end of the most recently ended calendar month, prepared
in reasonable detail and containing such other information as any Agent may
reasonably request and (2) a summary of the Inventory of (x) U.S. Borrower and
its Subsidiaries (other than Canadian Subsidiaries) and (y) the Canadian
Subsidiaries as of the end of the most recently ended calendar month, prepared
in reasonable detail and containing such other information as any Agent may
reasonably request; (h) from time to time, at any time upon the request of any
Agent, but at the cost of the applicable Borrower, a report of an independent
collateral field examiner approved by Agents in writing and reasonably
acceptable to the applicable Borrower (which may be, or be affiliated with, any
Agent or one of the Lenders) with respect to the Accounts and Inventory
components included in the U.S. Borrowing Base and the Canadian Borrowing Base
(provided, however, that so long as no Event of Default has occurred and is
continuing, Agents shall not require such a report more than once per calendar
year and during the continuance of an Event of Default, Agents shall not
require such a report more than once per calendar quarter), and (i) such other
information relating to the condition (financial or otherwise), operations,
prospects or business of any Obligor as from time to time may be reasonably
requested by any Agent. Each delivery of a financial statement pursuant to this
Section 7.2 shall constitute a restatement of the representations contained in
the last two sentences of Section 6.2.

         7.3 Financial Tests. Have and maintain:

                  (a) Net Worth - Net Worth of not less than (1) at all times
         during the period commencing on the Effective Date through and
         including September 30, 1998, an amount equal to $32,500,000 and (2)
         at all times during each fiscal quarter thereafter, the minimum Net
         Worth required as of the end of the immediately preceding fiscal
         quarter plus 50% of the net income of U.S. Borrower and its
         Subsidiaries, on a consolidated basis (if positive), for the period
         from June 30, 1998 through the last day of the fiscal quarter ending
         immediately prior to the date of such calculation plus 100% of the net
         proceeds realized from the issuance of any equity securities by U.S.
         Borrower during that period plus 100% of Net Equity Proceeds received
         during that period.

                  (b) Debt to Capitalization Ratio - a Debt to Capitalization
         Ratio of not greater than (1) 60% at all times during the period
         commencing on the Effective Date through and including March 31, 1999;
         (2) 55% at all times during the period commencing on April 1, 1999
         through and including September 30, 1999; (3) 50% at all times during
         the period commencing on October 1, 1999 through and including March
         31, 2000, and (4) 45% at all times thereafter.



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<PAGE>   69

                  (c) Fixed Charge Coverage Ratio - a Fixed Charge Coverage
         Ratio of not less than 1.25 to 1.00 at all times.

         7.4 Inspection. Permit each Agent and each Lender upon 3 days' prior
notice (unless a Default or an Event of Default has occurred which is
continuing, in which case no prior notice is required) to inspect its Property
in a manner consistent with applicable safety requirements and policies of
insurance, to examine its files, books and records, except classified
governmental material, and make and take away copies thereof, and to discuss
its affairs with its officers and accountants, all during normal business hours
and at such intervals and to such extent as any Agent may reasonably desire.

         7.5 Further Assurances. Promptly execute and deliver, at the expense
of U.S. Borrower or Canadian Borrower, as the case may be, any and all other
and further instruments which may be reasonably requested by any Agent to cure
any defect in the execution and delivery of any Loan Document in order to
effectuate the transactions contemplated by the Loan Documents, and in order to
grant, preserve, protect and perfect the validity and priority of the Liens
created by the Security Documents.

         7.6 Books and Records. Maintain books of record and account which
permit financial statements to be prepared in accordance with GAAP.

         7.7 Insurance. Maintain insurance on its Property with responsible
companies in such amounts, with such deductibles and against such risks as are
usually carried by owners of similar businesses and Properties in the same
general areas in which the applicable Obligor operates or as any Agent may
otherwise reasonably require, and furnish each Agent satisfactory evidence
thereof promptly upon request. These insurance provisions are cumulative of the
insurance provisions of the Security Documents. Each Agent shall be provided
with a certificate showing coverages provided under the policies of insurance
and such policies shall be endorsed to the effect that they will not be
canceled for nonpayment of premium, reduced or affected in any material manner
without thirty (30) days' prior written notice to Agents.

         7.8 Notice of Certain Matters. Give Agents written notice of the
following promptly after any executive officer of U.S. Borrower or Canadian
Borrower shall become aware of the same:

         (a) the issuance by any court or governmental agency or authority of
any injunction, order or other restraint prohibiting, or having the effect of
prohibiting, the performance of this Agreement, any other Loan Document, or the
making of the Loans or the acceptance and purchase of Bankers' Acceptances or
the initiation of any litigation, or any claim or controversy which would
reasonably be expected to result in the initiation of any litigation, seeking
any such injunction, order or other restraint;


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<PAGE>   70

         (b) the filing or commencement of any action, suit or proceeding,
whether at law or in equity or by or before any court or any Governmental
Authority involving claims in excess of $500,000 or which could reasonably be
expected to result in a Default hereunder; and

         (c) any Event of Default or Default, specifying the nature and extent
thereof and the action (if any) which is proposed to be taken with the respect
thereto.

Borrowers will also notify Agents in writing at least 30 days prior to the date
that any Obligor changes its name or the location of its chief executive office
or principal place of business or the place where it keeps its books and
records. After the Effective Date, Borrowers will notify Agents in writing at
least 45 days prior to any Borrower's or any of their Subsidiaries' (other than
Foreign Subsidiaries which are not Canadian Subsidiaries) acquisition of any
real Property or any material personal Property having aggregate fair market
value in excess of $2,500,000, wherever located, other than the Collateral
covered by the Security Documents (such acquisition or ownership being herein
called an "Additional Collateral Event" and the Property so acquired or owned
being herein called "Additional Collateral"). The occurrence of an Event of
Default shall constitute an Additional Collateral Event in respect of which the
Additional Collateral shall be all real and personal Property of Borrowers and
their Subsidiaries which is not already covered by a Security Document.

         7.9 Capital Adequacy. If any Lender shall have determined that the
adoption after the Effective Date or effectiveness after the Effective Date
(whether or not previously announced) of any applicable law, rule, regulation
or treaty regarding capital adequacy, or any change therein after the Effective
Date, or any change in the interpretation or administration thereof after the
Effective Date by any Governmental Authority, central bank or comparable agency
charged with the interpretation or administration thereof, or compliance by any
Lender with any request or directive after the Effective Date regarding capital
adequacy (whether or not having the force of law) of any such Governmental
Authority, central bank or comparable agency has or would have the effect of
reducing the rate of return on such Lender's capital as a consequence of its
obligations hereunder, under the Letters of Credit, the Notes or other
Obligations held by it to a level below that which such Lender could have
achieved but for such adoption, change or compliance (taking into consideration
such Lender's policies with respect to capital adequacy) by an amount deemed by
such Lender to be material, then from time to time, upon satisfaction of the
conditions precedent set forth in this Section, after demand by such Lender
(with a copy to the appropriate Agent) as provided below, pay (subject to
Sections 11.7 and 11.17 hereof) to such Lender such additional amount or
amounts as will compensate such Lender for such reduction. The certificate of
any Lender setting forth such amount or amounts as shall be necessary to
compensate it and the basis thereof and reasons therefor shall be delivered as
soon as practicable to U.S. Borrower or Canadian Borrower, as the case may be,
and shall be conclusive and binding, absent manifest error. U.S. Borrower or
Canadian Borrower, as the case may be, shall pay the amount shown as due on any
such certificate within fifteen (15) Business Days after the delivery of such
certificate. In preparing such certificate, a Lender may employ such
assumptions and allocations of costs and expenses as it shall in good faith
deem reasonable and may use any reasonable averaging and attribution method.



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         7.10 ERISA Information and Compliance. Promptly furnish to Agents: (i)
immediately upon receipt, a copy of any notice of complete or partial
withdrawal liability under Title IV of ERISA and any notice from the PBGC under
Title IV of ERISA of an intent to terminate or appoint a trustee to administer
any Plan, (ii) if requested by any Agent, promptly after the filing thereof
with the United States Secretary of Labor or the PBGC or the Internal Revenue
Service or any Governmental Authority having jurisdiction under Applicable
Canadian Pension Legislation, copies of each annual and other report or other
information return with respect to each Plan or any trust created thereunder,
(iii) immediately upon becoming aware of the occurrence of any "reportable
event," as such term is defined in Section 4043 of ERISA, for which the
disclosure requirements of Regulation Section 2615.3 promulgated by the PBGC
have not been waived, or of any "prohibited transaction," as such term is
defined in Section 4975 of the Code, in connection with any Plan or any trust
created thereunder, a written notice signed by an authorized officer of the
applicable Borrower or the applicable member of the Controlled Group specifying
the nature thereof, what action the applicable Borrower or the applicable
member of the Controlled Group is taking or proposes to take with respect
thereto, and, when known, any action taken by the PBGC, the Internal Revenue
Service, the Department of Labor or any other applicable Governmental Authority
with respect thereto, (iv) promptly after the filing or receiving thereof by
any Borrower or any member of the Controlled Group of any notice of the
institution of any proceedings or other actions which may result in the
termination of any Plan, in whole or in part, and (v) each request for waiver
of the funding standards or extension of the amortization periods required by
Sections 303 and 304 of ERISA or Section 412 of the Code promptly after the
request is submitted by any Borrower or any member of the Controlled Group to
the Secretary of the Treasury, the Department of Labor, the Internal Revenue
Service or any other applicable Governmental Authority. To the extent required
under applicable statutory funding requirements, each Borrower will fund, or
will cause the applicable member of the Controlled Group to fund, all current
service pension liabilities as they are incurred under the provisions of all
Plans from time to time in effect and, in addition, with respect to Plans
governed by Applicable Canadian Pension Legislation, all special payments in
connection with solvency deficiencies or going concern Unfunded Liabilities,
and comply with all applicable provisions of ERISA, in each case, except to the
extent that failure to do the same could not reasonably be expected to have a
Material Adverse Effect. Each Borrower covenants that it shall and shall cause
each member of the Controlled Group to (1) make contributions to each Plan in a
timely manner and in an amount sufficient to comply with the contribution
obligations under such Plan and the minimum funding standards requirements of
ERISA; (2) prepare and file in a timely manner all notices and reports required
under the terms of ERISA including but not limited to annual reports; and (3)
pay in a timely manner all required PBGC premiums, in each case, except to the
extent that failure to do the same could not reasonably be expected to have a
Material Adverse Effect.

         7.11 Additional Security Documents. As soon as practicable and in any
event within 30 days after an Additional Collateral Event, Borrowers shall (a)
execute and deliver or cause to be executed and delivered Security Documents,
in Proper Form, in favor of the applicable Agent and duly executed by the
applicable Obligor, granting a first-priority Lien (except for Permitted Liens
and except for Liens securing the EXIM Facility covering the "International
Collateral", as such term is defined in the Security Agreements) upon the
applicable Additional Collateral securing all of the



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Canadian Obligations (in the case of Canadian Subsidiaries) or the U.S.
Obligations (in the case of U.S. Borrower and its Subsidiaries which are not
Foreign Subsidiaries), except as Agents may otherwise agree in order to limit
recording taxes or similar charges based upon the amount secured, and such
other documents (including, without limitation, all items reasonably required
by Agents in connection with the applicable Security Documents previously
executed hereunder, all in Proper Form) as may be reasonably required by Agents
in connection with the execution and delivery of such Security Documents; (b)
deliver or cause to be delivered such other documents or certificates
consistent with the terms of this Agreement and relating to the transactions
contemplated hereby as Agents may reasonably request, and (c) pay in full all
documentary stamps, filing and recording fees, taxes and other fees and charges
payable in connection with the filing and recording of any such Security
Document.

         7.12 Year 2000. Any reprogramming or testing required to permit the
proper functioning, in and following the year 2000, of (i) each Obligors's
computer systems, to the extent such systems are material to the conduct of any
Obligor's business and (ii) equipment owned by any of the Obligors and
containing embedded microchips (including systems and equipment supplied by
others or with which any Obligor's systems interface), to the extent the proper
functioning of such equipment owned by any of the Obligors is material to the
conduct of any Obligor's business, will be completed in all material respects
by September 30, 1999, to the extent failure to do so would reasonably be
expected to have a Material Adverse Effect. The cost to Obligors of such
reprogramming and testing and of reasonably foreseeable consequences of year
2000 to Obligors (including, without limitation, reprogramming errors and
failure of others' systems or equipment) will not result in an Event of Default
and could not reasonably be expected to have a Material Adverse Effect. Except
for such of the reprogramming referred to in the preceding sentence as may be
necessary, the computer and management systems of Obligors are and, with
ordinary course upgrading and maintenance, will continue for the term of this
Agreement to be, sufficient to permit Obligors to conduct their business
without a Material Adverse Effect.

8.       Negative Covenants.

         U.S. Borrower and Canadian Borrower each covenants and agrees with
Agents and the Lenders that prior to the termination of this Agreement it will
not, and will not suffer or permit any of their Subsidiaries to, do any of the
following:

         8.1 Borrowed Money Indebtedness. Create, incur, suffer or permit to
exist, or assume or guarantee, directly or indirectly, or become or remain
liable with respect to any Borrowed Money Indebtedness, whether direct,
indirect, absolute, contingent or otherwise, except the following: (a)
Indebtedness under this Agreement and the other Loan Documents and Indebtedness
secured by Liens permitted by Section 8.2 hereof; (b) the liabilities existing
on the date of this Agreement and disclosed in the financial statements
delivered on or prior to the Effective Date pursuant to Section 6.2 hereof, and
subject to Section 8.10 hereof, all renewals, extensions and replacements (but
not increases) of any of the foregoing; (c) the Interest Rate Risk
Indebtedness; (d) purchase money Indebtedness to acquire Equipment obtained by
U.S. Borrower or any of its Subsidiaries in the


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ordinary course of business not exceeding $3,000,000 at any one time
outstanding, in the aggregate for all such Indebtedness; (e) Subordinated
Indebtedness; (f) Indebtedness of U.S. Borrower and its Subsidiaries under the
EXIM Facility; (g) Indebtedness created under leases which, in accordance with
GAAP have been recorded or should be recorded as capital leases, in an
aggregate amount not to exceed $1,000,000 at any one time outstanding; (h)
pre-existing Indebtedness, not to exceed $2,000,000 in the aggregate at any one
time outstanding, of Subsidiaries of U.S. Borrower which are acquired after the
date hereof (provided, however, that no such Indebtedness was incurred at the
instigation of U.S. Borrower in contemplation of the acquisition of such
Subsidiary), and (i) without limitation of any other part of this Section,
Indebtedness of U.S. Borrower or any of its Subsidiaries created, incurred or
assumed after the Effective Date, in an aggregate amount not to exceed $500,000
at any one time outstanding.

         8.2 Liens. Create or suffer to exist any Lien upon any of its Property
now owned or hereafter acquired, or acquire any Property upon any conditional
sale or other title retention device or arrangement or any purchase money
security agreement; or in any manner directly or indirectly sell, assign,
pledge or otherwise transfer any of its Accounts or General Intangibles;
except: (a) Liens created pursuant to any Loan Document; (b) Permitted Liens;
(c) Liens upon "International Collateral" (as defined in the EXIM Facility)
securing the EXIM Facility, (d) other Liens securing the EXIM Facility which
are subordinate and inferior to the Liens created pursuant to the Loan
Documents; (e) pre-existing Liens securing pre-existing Indebtedness permitted
under Section 8.1(h) hereof covering Property of the applicable Subsidiary of
U.S. Borrower acquired after the date hereof (provided, however, that no such
Liens were created and no such Indebtedness was incurred at the instigation of
U.S. Borrower in contemplation of the acquisition of such Subsidiary); (f)
Liens evidenced by capital leases permitted hereunder, and (g) a Lien on cash
of Borrower or a Subsidiary of Borrower in an amount not exceeding $300,000
securing an existing $262,000 letter of credit issued by Bank One, Texas, N.A.
in respect of which Borrower or a Subsidiary of Borrower is the applicant.

         8.3 Contingent Liabilities. Directly or indirectly guarantee the
performance or payment of, or purchase or agree to purchase, or assume or
contingently agree to become or be secondarily liable in respect of, any
obligation or liability of any other Person except for (a) the endorsement of
checks or other negotiable instruments in the ordinary course of business; (b)
obligations disclosed to Agents in the financial statements delivered on or
prior to the Effective Date pursuant to Section 6.2 hereof (and all renewals,
extensions and replacements--but not increases--of such obligations after the
Effective Date), (c) those liabilities permitted under Sections 8.1 or 8.2
hereof, (d) accounts payable incurred in the ordinary course of business and
(e) other contingent liabilities not exceeding $1,000,000 at any one time
outstanding.

         8.4 Mergers, Consolidations and Dispositions of Assets. In any single
transaction or series of transactions, directly or indirectly:

         (a)      liquidate or dissolve; provided that any Subsidiary of U.S.
                  Borrower may liquidate, dissolve or take action to wind-up
                  its operations if (i) U.S. Borrower determines such


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<PAGE>   74

                  action to be in the best interests of U.S. Borrower and its
                  Subsidiaries, (ii) liquidating dividends are paid to U.S.
                  Borrower or to a wholly-owned Subsidiary of U.S. Borrower,
                  and (iii) U.S. Borrower gives Agents written notice of such
                  action at least thirty (30) days prior to taking such action;

         (b)      be a party to any merger or consolidation unless and so long
                  as (i) no Default or Event of Default has occurred that is
                  then continuing, (ii) immediately thereafter and giving
                  effect thereto, no event will occur and be continuing which
                  constitutes a Default, (iii) an Obligor is the surviving
                  Person; (iv) the surviving Person ratifies and assumes each
                  Loan Document to which any party to such merger was a party,
                  and (v) Agents are given at least 30 days' prior written
                  notice of such merger or consolidation;

         (c)      sell, convey or lease all or any part of its assets, except
                  for (i) sales of Inventory in the ordinary course of
                  business, (ii) sales of other Property in the ordinary course
                  of business, (iii) sales or other dispositions of Property
                  not constituting Inventory or other Collateral in the
                  ordinary course of business; (iv) sales or other dispositions
                  of Property not constituting Collateral outside the ordinary
                  course of business; provided the fair market value of all
                  such Property does not exceed $1,000,000 during any fiscal
                  year; (v) sales or other dispositions of Property (whether or
                  not Collateral) expressly permitted by the other terms of
                  this Agreement or any Loan Document, (vi) the sale or other
                  disposition of the Property described on Exhibit K hereto and
                  (vii) subject to the Borrowers' compliance with Section
                  3.2(b), dispositions occurring as the result of a casualty
                  event or condemnation; provided, however, that, unless the
                  Majority Lenders shall have otherwise consented in writing,
                  the net proceeds realized from such sales or dispositions
                  permitted under subclauses (iii), (iv), (v) and (vi) of this
                  clause (c) must, within ninety (90) days after the applicable
                  sale or disposition, either (I) be used to make a prepayment
                  on the Term Loans pro rata based on their outstanding
                  principal balances (with such payments to be credited to
                  installments in inverse order of their maturity) or (II) be
                  reinvested in assets that may be productively used in the
                  business of U.S. Borrower or the applicable Subsidiary of
                  U.S. Borrower, or

         (d)      except for Liens in favor of Agents, pledge, transfer or
                  otherwise dispose of any equity interest in any of U.S.
                  Borrower's Subsidiaries or any Indebtedness of any of U.S.
                  Borrower's Subsidiaries or issue or permit any Subsidiary of
                  U.S. Borrower to issue any additional equity interest other
                  than stock dividends subject to a Lien in favor of Agents.

         8.5 Redemption, Dividends and Distributions. At any time: (a) redeem,
retire or otherwise acquire, directly or indirectly, any equity interest in any
Obligor or (b) make any distributions of any Property or cash to the owner of
any of the equity interests in any Obligor other than Permitted Dividends and
Permitted Investments.


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<PAGE>   75

         8.6 Nature of Business. Change the nature of its business or enter
into any business which is substantially different from the business in which
it is presently engaged.

         8.7 Transactions with Related Parties. Enter into any transaction or
agreement with any officer, director or holder of any equity interest in any
Obligor (or any Affiliate of any such Person) unless the same is upon terms
substantially similar to those obtainable from wholly unrelated sources (to the
best knowledge of Borrowers, after making reasonable inquiry).

         8.8 Loans and Investments. Make any loan, advance, extension of credit
or capital contribution to, or make or, except as permitted by Sections 8.4 or
8.9 hereof, have any Investment in, any Person, or make any commitment to make
any such extension of credit or Investment, except (a) Permitted Investments;
(b) normal and reasonable advances in the ordinary course of business to
officers and employees; (c) accounts receivable and accounts payable arising in
the ordinary course of business; (d) deposits in money market funds investing
exclusively in Permitted Investments; (e) Investments disclosed in the
financial statements delivered pursuant to Section 6.1; (f) routine advances by
any Obligor to another Obligor (or any Subsidiary of an Obligor) in the
ordinary course of business other than Investments, not to exceed $1,000,000 in
the aggregate at any time; (g) Investments by any Obligor in any other Obligor
which is not a Foreign Subsidiary, and (h) other Investments not to exceed
$2,500,000 in the aggregate at any time.

         8.9 Subsidiaries. Form, create or acquire any Subsidiary, except that
U.S. Borrower (or any of its Subsidiaries) may form, create or acquire a
wholly-owned Subsidiary so long as (a) immediately thereafter and giving effect
thereto, no event will occur and be continuing which constitutes a Default; (b)
if such Subsidiary is not a Foreign Subsidiary, (1) such Subsidiary shall
execute and deliver to each Agent a Guaranty in substantially the same form as
the Guaranties executed concurrently herewith, (2) such Subsidiary shall
execute and deliver to U.S. Agent such Security Documents as U.S. Agent may
reasonably require in order to create a valid, perfected, first priority Lien
upon all of the real and personal Property of such Subsidiary (subject to
exceptions set forth in this Agreement) securing the U.S. Obligations and (3)
the applicable owner(s) of the equity interests in such Subsidiary shall
execute and deliver to U.S. Agent such Security Documents as U.S. Agent may
reasonably require in order to create a valid, perfected, first priority Lien
upon all of the issued and outstanding equity interests in such Subsidiary; (c)
if such Subsidiary is a Foreign Subsidiary and is not a wholly-owned direct
Subsidiary of another Foreign Subsidiary, the applicable owner(s) of the equity
interests in such Subsidiary shall execute and deliver to U.S. Agent such
Security Documents as U.S. Agent may reasonably require in order to create a
valid, perfected, first priority Lien upon 65% of the issued and outstanding
equity interests in such Subsidiary and shall execute and deliver to Canadian
Agent such Security Documents as Canadian Agent may reasonably require in order
to create a valid, perfected, first priority Lien upon the remaining 35% of the
issued and outstanding equity interests in such Subsidiary; (d) if such
Subsidiary is a Canadian Subsidiary, (1) such Subsidiary shall execute and
deliver to Canadian Agent a Guaranty in substantially the same form as the
Guaranties executed concurrently herewith in favor of Canadian Agent and (2)
such Subsidiary shall execute and deliver to Canadian Agent such Security
Documents as Canadian Agent may reasonably require in order to create a valid,
perfected, first priority Lien upon all of the real and




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personal Property of such Subsidiary (subject to exceptions set forth in this
Agreement) securing the Canadian Obligations, and (e) Agents are given at least
30 days' prior written notice of such formation, creation or acquisition.
Notwithstanding the foregoing, no Foreign Subsidiary may form, create or
acquire a Subsidiary which is not a Foreign Subsidiary.

         8.10 Key Agreements. Terminate or agree to the termination of any Key
Agreement or amend, modify or obtain or grant a waiver of any provision of any
of the Key Agreements if such action could reasonably be expected to have a
Material Adverse Effect (provided that no consent of any Agent or any Bank
shall be required with respect to an amendment of the EXIM Facility which has
the sole effect of increasing the EXIM Facility to an amount not greater than
$10,000,000).

         8.11 Organizational Documents. Amend, modify, restate or supplement
any of its Organizational Documents if such action could reasonably be expected
to have a Material Adverse Effect.

         8.12 Unfunded Liabilities. Incur any Unfunded Liabilities after the
Effective Date or allow any Unfunded Liabilities in excess of $1,000,000, in
the aggregate, to arise or exist.

         8.13 Operating Lease Expenses. Aggregate operating lease expenses
(excluding lease payments under capital leases) shall not exceed, for U.S.
Borrower and its Subsidiaries, in the aggregate in any fiscal year, $5,000,000.

         8.14 Sale/Leasebacks. U.S. Borrower will not (and will not permit any
of its Subsidiaries to) enter into any sale/leaseback transactions after the
date hereof without the prior written consent of the Majority Lenders. Without
limiting the foregoing, any leasehold estate acquired pursuant to a permitted
sale/leaseback shall constitute Additional Collateral, and the closing of such
sale/leaseback transaction shall constitute an Additional Collateral Event, for
all purposes hereunder.

         8.15 Subordinated Indebtedness. Except as expressly permitted in
writing by the Majority Lenders, Borrowers will not amend, modify or obtain or
grant a waiver of any provision of any document or instrument evidencing any
Subordinated Indebtedness or purchase, redeem, retire or otherwise acquire for
value, deposit any monies with any Person with respect to or make any payment
or prepayment of the principal of or any other amount owing in respect of, any
Subordinated Indebtedness.

         8.16 Acquisitions. Acquire any real Property or any material personal
Property after the Effective Date with respect to which the aggregate cash
consideration (exclusive of consideration paid in equity and net of additional
equity contributions made to Group by any of its shareholders which is
restricted to be used for the applicable acquisition in a manner satisfactory
to Agents) for a single transaction would exceed $10,000,000.

         8.17 Negative Pledges. Except for (a) any of the Loan Documents, (b)
the EXIM Facility, (c) agreements permitted by Section 8.1(g) but only with
respect to the Property subject to the Lien



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<PAGE>   77

permitted thereby; (d) customary provisions in leases, licenses, asset sale
agreements and other customary agreements not related to the Borrowed Money
Indebtedness and entered into in the ordinary course of business, and (e)
restrictions imposed by agreements governing Permitted Liens, enter into any
agreement or contract which limits or restricts in any way the granting of
Liens by U.S. Borrower or any of its Subsidiaries securing any of the
Obligations.

9.       Defaults.

         9.1 Events of Default. If any one or more of the following events
(herein called "Events of Default") shall occur, then either Agent may (and at
the direction of the Majority Lenders, shall) do any or all of the following:
(1) without notice to U.S. Borrower, Canadian Borrower or any other Person,
declare the U.S. Commitments and the Canadian Commitments terminated (whereupon
the Commitments shall be terminated) and/or accelerate the Termination Date to
a date as early as the date of termination of the U.S. Commitments and the
Canadian Commitments; (2) terminate any Letter of Credit allowing for such
termination, by sending a notice of termination as provided therein and require
the applicable Borrower to provide Cover for outstanding Letters of Credit; (3)
declare the principal amount then outstanding of and the unpaid accrued
interest on the Loans and Reimbursement Obligations and all fees and all other
amounts payable hereunder, under the Notes and under the other Loan Documents
to be forthwith due and payable, whereupon such amounts shall be and become
immediately due and payable, without notice (including, without limitation,
notice of acceleration and notice of intent to accelerate), presentment,
demand, protest or other formalities of any kind, all of which are hereby
expressly waived by U.S. Borrower and Canadian Borrower; provided that in the
case of the occurrence of an Event of Default with respect to any Obligor
referred to in clause (f), (g) or (h) of this Section 9.1, the U.S. Commitments
and the Canadian Commitments shall be automatically terminated and the
principal amount then outstanding of and unpaid accrued interest on the Loans
and the Reimbursement Obligations and all fees and all other amounts payable
hereunder, under the Notes and under the other Loan Documents shall be and
become automatically and immediately due and payable, without notice
(including, without limitation, notice of acceleration and notice of intent to
accelerate), presentment, demand, protest or other formalities of any kind, all
of which are hereby expressly waived by U.S. Borrower and Canadian Borrower,
and (4) exercise any or all other rights and remedies available to any Agent or
any Lenders under the Loan Documents, at law or in equity:

                  (a) Payments - (i) any Obligor shall fail to make any payment
         or required prepayment of any installment of principal on the Loans or
         any Reimbursement Obligation payable under the Notes, this Agreement
         or the other Loan Documents when due or (ii) any Obligor fails to make
         any payment or required payment of interest with respect to the Loans,
         any Reimbursement Obligation or any other fee or amount under the
         Notes, this Agreement or the other Loan Documents when due and, in the
         case of clause (ii) only, such failure to pay continues unremedied for
         a period of five days; or

                  (b) Other Obligations - any Obligor shall default in the
         payment when due of any principal of or interest on any Indebtedness
         having an outstanding principal amount of at




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<PAGE>   78

         least $3,000,000 (other than the Loans and Reimbursement Obligations)
         and such default shall continue beyond any applicable period of grace
         and shall give rise to a right on the part of the holder of such
         Indebtedness to accelerate such Indebtedness; or any event or
         condition shall occur which results in the acceleration of the
         maturity of any such Indebtedness or enables (or, with the giving of
         notice or lapse of time or both, would enable) the holder of any such
         Indebtedness or any Person acting on such holder's behalf to
         accelerate the maturity thereof and such event or condition shall not
         be cured within any applicable period of grace; or

                  (c) Representations and Warranties - any representation or
         warranty made or deemed made by or on behalf of any Obligor in this
         Agreement or any other Loan Document or in any certificate furnished
         or made by any Obligor to Agents or the Lenders in connection herewith
         or therewith shall prove to have been incorrect, false or misleading
         in any material respect as of the date thereof or as of the date as of
         which the facts therein set forth were stated or certified or deemed
         stated or certified; or

                  (d) Affirmative Covenants - (i) default shall be made in the
         due observance or performance of any of the covenants or agreements
         contained in Section 7.3 hereof or (ii) default is made in the due
         observance or performance of any of the other covenants and agreements
         contained in Section 7 hereof or any other affirmative covenant of any
         Obligor contained in this Agreement or any other Loan Document and
         such default continues unremedied for a period of 30 days after (x)
         notice thereof is given by any Agent to U.S. Borrower or to Canadian
         Borrower or (y) such default otherwise becomes known to any executive
         officer of U.S. Borrower or to Canadian Borrower, whichever is
         earlier; or

                  (e) Negative Covenants - default is made in the due
         observance or performance by U.S. Borrower or Canadian Borrower of any
         of the other covenants or agreements contained in Section 8 of this
         Agreement or of any other negative covenant of any Obligor contained
         in this Agreement or any other Loan Document; or

                  (f) Involuntary Bankruptcy or Receivership Proceedings - a
         receiver, receiver-manager, interim receiver, monitor, conservator,
         liquidator or trustee of any Obligor or of any of its Property is
         appointed by the order or decree of any court or agency or supervisory
         authority having jurisdiction, and such decree or order remains in
         effect for more than 90 days; or any Obligor is adjudicated bankrupt
         or insolvent; or any of such Person's Property is sequestered by court
         order and such order remains in effect for more than 90 days; or a
         petition is filed against any Obligor under any state or federal
         bankruptcy, reorganization, arrangement, insolvency, readjustment or
         debt, dissolution, liquidation or receivership law or any
         jurisdiction, whether now or hereafter in effect, and is not dismissed
         within 90 days after such filing; or

                  (g) Voluntary Petitions or Consents - any Obligor commences a
         voluntary case or other proceeding or order seeking liquidation,
         reorganization, arrangement, insolvency,


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<PAGE>   79

         readjustment of debt, dissolution, liquidation or other relief with
         respect to itself or its debts or other liabilities under any
         bankruptcy, insolvency or other similar law now or hereafter in effect
         or seeking the appointment of a trustee, receiver, liquidator,
         custodian or other similar official of it or any substantial part of
         its Property, or consents to any such relief or to the appointment of
         or taking possession by any such official in an involuntary case or
         other proceeding commenced against it, or fails generally to, or
         cannot, pay its debts generally as they become due or takes any
         corporate action to authorize or effect any of the foregoing; or

                  (h) Assignments for Benefit of Creditors or Admissions of
         Insolvency - any Obligor makes an assignment for the benefit of its
         creditors, or admits in writing its insolvency (including any
         admission of its inability to pay its debts generally as they become
         due), or consents to the appointment of a receiver, receiver-manager,
         interim receiver, monitor, trustee, or liquidator of such Obligor or
         of all or any substantial part of its Property; or

                  (i) Undischarged Judgments - a final non-appealable judgment
         or judgments for the payment of money exceeding, in the aggregate,
         $1,000,000 (exclusive of amounts covered by insurance) is rendered by
         any court or other governmental body against any Obligor and such
         Obligor does not discharge the same or provide for its discharge in
         accordance with its terms, or procure a stay of execution thereof
         within 30 days from the date of entry thereof; or

                  (j) Security Documents - any Security Document after delivery
         thereof, shall for any reason, except to the extent permitted by the
         terms of this Agreement or such Security Document, ceases to create a
         valid and perfected Lien of the first priority (subject to the
         Permitted Liens), required thereby on any of the Collateral
         individually or in the aggregate having a fair market value in excess
         of $1,000,000 purported to be covered thereby and securing that
         portion of the Obligations which is therein designated as being
         secured, or any Obligor (or any other Person who may have granted or
         purported to grant such Lien) will so state in writing or, after the
         creation thereof as herein provided, U.S. Agent shall cease to have a
         valid, perfected, first priority Lien upon all of the issued and
         outstanding equity interests in and to all Subsidiaries (other than
         Foreign Subsidiaries) of U.S. Borrower and upon 65% of the issued and
         outstanding equity interests in and to Foreign Subsidiaries of U.S.
         Borrower securing the U.S. Obligations or, after the creation thereof
         as herein provided, Canadian Agent shall cease to have a valid,
         perfected, first priority Lien upon the remaining 35% of the issued
         and outstanding equity interests in and to Foreign Subsidiaries of
         U.S. Borrower securing the Canadian Obligations; or

                  (k) Ownership Change or Encumbrance - (i) any Person other
         than U.S. Borrower shall own any equity interest in any Subsidiary of
         U.S. Borrower (other than a 15% equity interest in NATCO Japan Co.,
         Inc. currently owned by Persons other than U.S. Borrower) or any
         Person other than an Agent shall acquire any Lien on any equity
         interest in any Subsidiary of U.S. Borrower (other than a subordinate
         Lien in favor of the holder(s) of the


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<PAGE>   80

         EXIM Facility); or (ii) Group shall cease to be the beneficial owner,
         directly or indirectly, of all of the equity interests in U.S.
         Borrower; or (iii) The Capricorn Group (Cap I, II and Affiliates)
         shall cease to be the beneficial owners, directly or indirectly, of at
         least 20% of the equity interests in Group or any Person shall own,
         directly or indirectly, more of the equity interests in Group than The
         Capricorn Group (Cap I, II and Affiliates).

                  (l) Uninsured Loss - any Obligor shall be the subject of any
         uninsured or unindemnified casualty losses exceeding, in the
         aggregate, $1,000,000 in any fiscal year.

         9.2 Right of Setoff. Upon the occurrence and during the continuance of
any Event of Default, each Lender is hereby authorized at any time and from
time to time, without notice to any Obligor (any such notice being expressly
waived by U.S. Borrower, Canadian Borrower and the other Obligors), to setoff
and apply any and all deposits, whether general or special, time or demand,
provisional or final (but excluding the funds held in accounts clearly
designated as escrow or trust accounts held by U.S. Borrower, Canadian Borrower
or any other Obligor for the benefit of Persons which are not Affiliates of any
Obligor), whether or not such setoff results in any loss of interest or other
penalty, and including without limitation all certificates of deposit, at any
time held, and any other funds or Property at any time held, and other
Indebtedness at any time owing by such Lender to or for the credit or the
account of U.S. Borrower, Canadian Borrower or any other Obligor against any
and all of the Obligations irrespective of whether or not such Lender or any
Agent will have made any demand under this Agreement, the Notes or any other
Loan Document. Should the right of any Lender to realize funds in any manner
set forth hereinabove be challenged and any application of such funds be
reversed, whether by court order or otherwise, the Lenders shall make
restitution or refund to U.S. Borrower or Canadian Borrower or the applicable
other Obligor, as the case may be, pro rata in accordance with their U.S.
Commitments or Canadian Commitments, as the case may be. Each Lender agrees to
promptly notify U.S. Borrower, Canadian Borrower and Agents after any such
setoff and application, provided that the failure to give such notice will not
affect the validity of such setoff and application. The rights of Agents and
the Lenders under this Section are in addition to other rights and remedies
(including without limitation other rights of setoff) which Agents or the
Lenders may have. This Section is subject to the terms and provisions of
Sections 4.5 and 11.7 hereof. Notwithstanding anything to the contrary
contained herein or in any of the other Loan Documents, any amounts realized
under this Section which constitute an asset of any Foreign Subsidiary shall
only be applied to the payment of Canadian Obligations.

         9.3 Collateral Account. U.S. Borrower hereby agrees, in addition to
the provisions of Section 9.1 hereof, that upon the occurrence and during the
continuance of any Event of Default, it shall, if requested by any Agent or by
the Majority Lenders (through any Agent), pay to U.S. Agent an amount in
immediately available funds equal to the then aggregate amount available for
drawings under all outstanding U.S. Letters of Credit, which funds shall be
held by U.S. Agent as Cover. Canadian Borrower hereby agrees, in addition to
the provisions of Section 9.1 hereof, that upon the occurrence and during the
continuance of any Event of Default, it shall, if requested by any Agent or by
the Majority Lenders (through any Agent), pay to Canadian Agent an amount in
immediately available funds equal to the sum of the then aggregate amount
available for drawings under all



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<PAGE>   81

outstanding Canadian Letters of Credit plus the unpaid principal balance of all
outstanding Bankers' Acceptances, which funds shall be held by Canadian Agent
as Cover.

         9.4 Preservation of Security for Letter of Credit Liabilities. In the
event that, following (i) the occurrence of an Event of Default and the
exercise of any rights available to any Agent or any Lender under the Loan
Documents, and (ii) payment in full of the principal amount then outstanding of
and the accrued interest on the Loans and Reimbursement Obligations and fees
and all other amounts payable hereunder and under the Loan Documents and all
other amounts secured by the Security Documents, any Letters of Credit or
Bankers' Acceptances shall remain outstanding and undrawn upon, the applicable
Agent shall be entitled to hold (and each Borrower and each other Obligor
hereby grants and conveys to Agent a security interest in and to) all cash or
other Property ("Proceeds of Remedies") realized or arising out of the exercise
of any rights available under the Loan Documents, at law or in equity,
including, without limitation, the proceeds of any foreclosure, as collateral
for the payment of any amounts due or to become due under or in respect of such
Letters of Credit and/or such Bankers' Acceptances. Such Proceeds of Remedies
shall be held for the ratable benefit of the U.S. Lenders or the Canadian
Lenders, as the case may be. The rights, titles, benefits, privileges, duties
and obligations of the applicable Agent with respect thereto shall be governed
by the terms and provisions of this Agreement and, to the extent not
inconsistent with this Agreement, the applicable Security Documents. The
applicable Agent may, but shall have no obligation to, invest any such Proceeds
of Remedies in such manner as such Agent, in the exercise of its sole
discretion, deems appropriate. Such Proceeds of Remedies shall be applied to
Reimbursement Obligations arising in respect of any such Letters of Credit, the
payment of any Lender's obligations under any such Letter of Credit and/or the
Obligations relating to any such Bankers' Acceptance when such Letter of Credit
is drawn upon or such Bankers' Acceptance matures, as the case may be. Nothing
in this Section shall cause or permit an increase in the maximum amount of the
Obligations permitted to be outstanding from time to time under this Agreement.
Notwithstanding anything to the contrary contained herein or in any of the
other Loan Documents, any amounts realized under this Section which constitute
an asset of any Foreign Subsidiary or which arise out of any voluntary Lien
upon equity interests in any Foreign Subsidiary other than the 65% of such
equity interests which is pledged as security for the U.S. Obligations shall
only be applied to the payment of Canadian Obligations.

         9.5 Currency Conversion After Maturity. At any time following the
occurrence of an Event of Default and the acceleration of the maturity of the
Obligations owed to the Canadian Lenders hereunder, the Canadian Lenders shall
be entitled to convert, with two (2) Business Days' prior notice to Canadian
Borrower, any and all or any part of the then unpaid and outstanding LIBOR
Borrowings and Base Rate Borrowings of the Canadian Borrower to Canadian Prime
Loans. Any such conversion shall be calculated so that the resulting Canadian
Prime Loans shall be the equivalent on the date of conversion of the amount of
Dollars so converted. Any accrued and unpaid interest denominated in Dollars at
the time of any such conversion shall be similarly converted to Canadian
Dollars, and such Canadian Prime Loans and accrued and unpaid interest thereon
shall thereafter bear interest in accordance with the terms hereof.



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         9.6 Remedies Cumulative. No remedy, right or power conferred upon any
Agent or any Lender is intended to be exclusive of any other remedy, right or
power given hereunder or now or hereafter existing at law, in equity, or
otherwise, and all such remedies, rights and powers shall be cumulative.

10.      Agents.

         10.1 Appointment, Powers and Immunities. Each U.S. Lender hereby
irrevocably appoints and authorizes U.S. Agent to act as its agent hereunder,
under the U.S. Letters of Credit and under the other Loan Documents with such
powers as are specifically delegated to U.S. Agent by the terms hereof and
thereof, together with such other powers as are reasonably incidental thereto.
Each Canadian Lender hereby irrevocably appoints and authorizes Canadian Agent
to act as its agent hereunder, under the Canadian Letters of Credit and under
the other Loan Documents with such powers as are specifically delegated to
Canadian Agent by the terms hereof and thereof, together with such other powers
as are reasonably incidental thereto. Any Loan Documents executed in favor of
any Agent shall be held by such Agent for the ratable benefit of the applicable
Lenders. None of the Agents ("Agents" as used in this Section 10 shall include
reference to their Affiliates and their own and their Affiliates' respective
officers, shareholders, directors, employees and agents) (a) shall have any
duties or responsibilities except those expressly set forth in this Agreement,
the Letters of Credit, and the other Loan Documents, and shall not by reason of
this Agreement or any other Loan Document be a trustee or fiduciary for any
Lender; (b) shall be responsible to any Lender for any recitals, statements,
representations or warranties contained in this Agreement, the Letters of
Credit or any other Loan Document, or in any certificate or other document
referred to or provided for in, or received by any of them under, this
Agreement, the Letters of Credit or any other Loan Document, or for the value,
validity, effectiveness, genuineness, enforceability, execution, filing,
registration, collectibility, recording, perfection, existence or sufficiency
of this Agreement, the Letters of Credit, or any other Loan Document or any
other document referred to or provided for herein or therein or any Property
covered thereby or for any failure by any Obligor or any other Person to
perform any of its obligations hereunder or thereunder, or shall have any duty
to inquire into or pass upon any of the foregoing matters; (c) shall be
required to initiate or conduct any litigation or collection proceedings
hereunder or under the Letters of Credit or any other Loan Document except to
the extent requested and adequately indemnified by the Majority Lenders; (d)
shall be responsible for any mistake of law or fact or any action taken or
omitted to be taken by it hereunder or under the Letters or Credit or any other
Loan Document or any other document or instrument referred to or provided for
herein or therein or in connection herewith or therewith, including, without
limitation, pursuant to its own negligence, except for its own gross negligence
or willful misconduct; (e) shall be bound by or obliged to recognize any
agreement among or between any Borrower and any Lender to which such Agent is
not a party, regardless of whether such Agent has knowledge of the existence of
any such agreement or the terms and provisions thereof; (f) shall be charged
with notice or knowledge of any fact or information not herein set out or
provided to such Agent in accordance with the terms of this Agreement or any
other Loan Document; (g) shall be responsible for any delay, error, omission or
default of any mail, telegraph, cable or wireless agency or operator, and (h)
shall be responsible for the acts or edicts of any Governmental Authority. Any
Agent may employ agents

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and attorneys-in-fact and none of the Agents shall be responsible for the
negligence or misconduct of any such agents or attorneys-in-fact selected by it
with reasonable care. Without in any way limiting any of the foregoing, each
Lender acknowledges that none of the Agents (nor any Issuer) shall have greater
responsibility in the operation of the Letters of Credit than is specified in
the Uniform Customs and Practice for Documentary Credits (1993 Revision,
International Chamber of Commerce Publication No. 500). In any foreclosure
proceeding concerning any Collateral, each holder of an Obligation if bidding
for its own account or for its own account and the accounts of other Lenders is
prohibited from including in the amount of its bid an amount to be applied as a
credit against the Obligations held by it or the Obligations held by the other
Lenders; instead, such holder must bid in cash only. However, in any such
foreclosure proceeding, (i) U.S. Agent may (but shall not be obligated to)
submit a bid for all U.S. Lenders (including itself) in the form of a credit
against the U.S. Obligations, and U.S. Agent or its designee may (but shall not
be obligated to) accept title to such collateral for and on behalf of all U.S.
Lenders and (ii) Canadian Agent may (but shall not be obligated to) submit a
bid for all Canadian Lenders (including itself) in the form of a credit against
the Canadian Obligations, and Canadian Agent or its designee may (but shall not
be obligated to) accept title to such collateral for and on behalf of all
Canadian Lenders

         10.2 Reliance. Each Agent shall be entitled to rely upon any
certification, notice or other communication (including any thereof by
telephone, telegram or cable) believed by it to be genuine and correct and to
have been signed or sent by or on behalf of the proper Person or Persons, and
upon advice and statements of legal counsel (which may be counsel for any
Borrower), independent accountants and other experts selected by such Agent.
None of the Agents shall be required in any way to determine the identity or
authority of any Person delivering or executing the same. As to any matters not
expressly provided for by this Agreement, the Letters of Credit, or any other
Loan Document, each Agent shall in all cases be fully protected in acting, or
in refraining from acting, hereunder and thereunder in accordance with
instructions of the Majority Lenders, and any action taken or failure to act by
U.S. Agent pursuant thereto shall be binding on all of the U.S. Lenders and any
action taken or failure to act by Canadian Agent pursuant thereto shall be
binding on all of the Canadian Lenders. Pursuant to instructions of the
Majority Lenders, the Agents shall have the authority to execute releases of
the Security Documents on behalf of the Lenders without the joinder of any
Lender. If any order, writ, judgment or decree shall be made or entered by any
court affecting the rights, duties and obligations of any Agent under this
Agreement or any other Loan Document, then and in any of such events such Agent
is authorized, in its sole discretion, to rely upon and comply with such order,
writ, judgment or decree which it is advised by legal counsel of its own
choosing is binding upon it under the terms of this Agreement, the relevant
Loan Document or otherwise; and if such Agent complies with any such order,
writ, judgment or decree, then it shall not be liable to any Lender or to any
other Person by reason of such compliance even though such order, writ,
judgment or decree may be subsequently reversed, modified, annulled, set aside
or vacated.

         10.3 Defaults. None of the Agents shall be deemed to have knowledge of
the occurrence of a Default (other than the non-payment of principal of or
interest on Loans or Reimbursement Obligations) unless such Agent has received
notice from a Lender or a Borrower specifying such Default and stating that
such notice is a "Notice of Default." In the event that any Agent receives

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such a Notice of Default, such Agent shall give prompt notice thereof to the
Lenders (and shall give each Lender prompt notice of each such non-payment).
Each Agent shall (subject to Section 10.7 hereof) take such action with respect
to such Notice of Default as shall be directed by the Majority Lenders and
within its rights under the Loan Documents and at law or in equity, provided
that, unless and until an Agent shall have received such directions, such Agent
may (but shall not be obligated to) take such action, or refrain from taking
such action, permitted hereby with respect to such Notice of Default as it
shall deem advisable in the best interests of the Lenders and within its rights
under the Loan Documents, at law or in equity.

         10.4 Material Written Notices. In the event that any Agent receives
any written notice of a material nature from any Borrower or any Obligor under
the Loan Documents, such Agent shall promptly inform each of the Lenders
thereof.

         10.5 Rights as a Lender. With respect to their U.S. Commitments or
Canadian Commitments, as the case may be, and the Obligations, each of Chase
Texas and BNS, in its capacity as a Lender hereunder, shall have the same
rights and powers hereunder as any other Lender and may exercise the same as
though it were not acting in its agency capacity, and the term "Lender" or
"Lenders" shall, unless the context otherwise indicates, include each Agent in
its individual capacity. Each Agent may (without having to account therefor to
any Lender) accept deposits from, lend money to and generally engage in any
kind of banking, trust, letter of credit, agency or other business with any
Borrower (and any of their Affiliates) as if it were not acting as an Agent,
and each Agent may accept fees and other consideration from any Borrower (in
addition to the fees heretofore agreed to between any Borrower and any Agent)
for services in connection with this Agreement or otherwise without having to
account for the same to the Lenders.

         10.6 Indemnification. The Canadian Lenders and the U.S. Lenders,
respectively, agree to indemnify Canadian Agent and U.S. Agent, respectively
(to the extent not reimbursed under Section 2.2(c), Section 11.3 or Section
11.4 hereof, but without limiting the obligations of any Borrower under said
Sections 2.2(c), 11.3 and 11.4), ratably in accordance with the sum of the
applicable Lenders' respective U.S. Commitments, Canadian Commitments and Term
Loans, for any and all liabilities, obligations, losses, damages, penalties,
actions, judgments, suits, costs, expenses or disbursements of any kind and
nature whatsoever, REGARDLESS OF WHETHER CAUSED IN WHOLE OR IN PART BY THE
NEGLIGENCE OF ANY INDEMNIFIED PARTIES, which may be imposed on, incurred by or
asserted against the applicable Agent in any way relating to or arising out of
this Agreement, the Letters of Credit or any other Loan Document or any other
documents contemplated by or referred to herein or therein or the transactions
contemplated hereby or thereby (including, without limitation, the costs and
expenses which any Borrower is obligated to pay under Sections 2.2(c), 11.3 and
11.4 hereof, interest, penalties, attorneys' fees and amounts paid in
settlement, but excluding, unless a Default has occurred and is continuing,
normal administrative costs and expenses incident to the performance of its
agency duties hereunder) or the enforcement of any of the terms hereof or
thereof or of any such other documents; provided that no Lender shall be liable
for any of the foregoing to the extent they arise from the gross negligence or
willful misconduct of the party to be indemnified. The obligations of the
Lenders under this Section 10.6 shall survive the termination of this Agreement
and the repayment of the Obligations.


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         10.7 Non-Reliance on Agents and Other Lenders. Each Lender agrees that
it has received current financial information with respect to each Borrower and
each other Obligor and that it has, independently and without reliance on any
Agent or any other Lender and based on such documents and information as it has
deemed appropriate, made its own credit analysis of each Borrower and each
other Obligor and decision to enter into this Agreement and that it will,
independently and without reliance upon any Agent or any other Lender, and
based on such documents and information as it shall deem appropriate at the
time, continue to make its own analysis and decisions in taking or not taking
action under this Agreement or any of the other Loan Documents. None of the
Agents shall be required to keep itself informed as to the performance or
observance by any Obligor of this Agreement, the Letters of Credit or any of
the other Loan Documents or any other document referred to or provided for
herein or therein or to inspect the properties or books of any Obligor. Except
for notices, reports and other documents and information expressly required to
be furnished to the Lenders by an Agent hereunder, under the Letters of Credit
or the other Loan Documents, none of the Agents shall have any duty or
responsibility to provide any Lender with any credit or other information
concerning the affairs, financial condition or business of any Obligor (or any
of their affiliates) which may come into the possession of any Agent.

         10.8 Failure to Act. Except for action expressly required of an Agent
hereunder, under the Letters of Credit or under the other Loan Documents, each
Agent shall in all cases be fully justified in failing or refusing to act
hereunder and thereunder unless it shall receive further assurances to its
satisfaction by the Lenders of their indemnification obligations under Section
10.6 hereof against any and all liability and expense which may be incurred by
it by reason of taking or continuing to take any such action.

         10.9 Resignation or Removal of Agent. Subject to the appointment and
acceptance of a successor U.S. Agent or Canadian Agent, as the case may be, as
provided below, U.S. Agent and Canadian Agent, respectively, may resign at any
time by giving notice thereof to the U.S. Lenders and the Canadian Lenders,
respectively, and to U.S. Borrower and Canadian Borrower, respectively. Any
Agent may be removed at any time with or without cause by the Majority Lenders;
provided, that such Agent shall continue as U.S. Agent or Canadian Agent, as
the case may be, until such time as any successor shall have accepted
appointment hereunder as U.S. Agent or Canadian Agent, as the case may be. Upon
any such resignation or removal, (i) the Majority Lenders without the consent
of any Borrower shall have the right to appoint a successor U.S. Agent or
Canadian Agent, as the case may be, so long as such successor U.S. Agent or
Canadian Agent, as the case may be, is also a Lender at the time of such
appointment and (ii) the Majority Lenders shall have the right to appoint a
successor U.S. Agent or Canadian Agent, as the case may be, that is not a
Lender at the time of such appointment so long as Borrowers consent to such
appointment (which consent shall not be unreasonably withheld). If no successor
U.S. Agent or Canadian Agent, as the case may be, shall have been so appointed
by the Majority Lenders and accepted such appointment within 30 days after the
retiring U.S. Agent's or Canadian Agent's, as the case may be, giving of notice
of resignation or the Majority Lenders' removal of the retiring U.S. Agent or
Canadian Agent, as the case may be, then the retiring Agent may, on behalf of
the applicable Lenders, appoint a successor U.S. Agent or Canadian Agent, as
the case may be, without the necessity of any consent on the part of any
Borrower or any Lender. Any successor U.S. Agent shall be a bank which has an
office in the


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United States and a combined capital and surplus of at least $250,000,000 and
any successor Canadian Agent shall be a bank which has an office in Canada and
a combined capital and surplus of at least C$250,000,000. Upon the acceptance
of any appointment as U.S. Agent or Canadian Agent, as the case may be,
hereunder by a successor Agent, such successor Agent shall thereupon succeed to
and become vested with all the rights, powers, privileges and duties of the
retiring Agent and the retiring Agent shall be discharged from its duties and
obligations hereunder and under any other Loan Documents. Such successor Agent
shall promptly specify by notice to Borrowers its Principal Office referred to
in Section 3.1 and Section 4 hereof. After any retiring Agent's resignation or
removal hereunder as an Agent, the provisions of this Section 10 shall continue
in effect for its benefit in respect of any actions taken or omitted to be
taken by it while it was acting as Agent.

         10.10 No Partnership. Neither the execution and delivery of this
Agreement nor any of the other Loan Documents nor any interest the Lenders,
Agents or any of them may now or hereafter have in all or any part of the
Obligations shall create or be construed as creating a partnership, joint
venture or other joint enterprise between the Lenders or among the Lenders and
any Agent. The relationship between the Lenders, on the one hand, and any
Agent, on the other, is and shall be that of principals and agent only, and
nothing in this Agreement or any of the other Loan Documents shall be construed
to constitute any Agent as trustee or other fiduciary for any Lender or to
impose on any Agent any duty, responsibility or obligation other than those
expressly provided for herein and therein.

         10.11 Authority of Agent. Each Lender acknowledges that the rights and
responsibilities of each Agent under this Agreement and the Loan Documents with
respect to any action taken by such Agent or the exercise or non-exercise by
any Agent of any option, right, request, judgment or other right or remedy
provided for herein or resulting or arising out of this Agreement and/or the
other Loan Documents shall, as between such Agent and the Lenders, be governed
by this Agreement and by such other agreements with respect thereto as may
exist from time to time among them, but, as between such Agent and the
Obligors, such Agent shall be conclusively presumed to be acting as agent for
the applicable Lenders with full and valid authority so to act or refrain from
acting; and each Obligor shall not be under any obligation, or entitlement, to
make any inquiry respecting such authority.

11.      Miscellaneous.

         11.1 Waiver. No waiver of any Default or Event of Default shall be a
waiver of any other Default or Event of Default. No failure on the part of any
Agent or any Lender to exercise and no delay in exercising, and no course of
dealing with respect to, any right, power or privilege under any Loan Document
shall operate as a waiver thereof, nor shall any single or partial exercise of
any right, power or privilege thereunder preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The remedies
provided in the Loan Documents are cumulative and not exclusive of any remedies
provided by law or in equity.


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         11.2 Notices. All notices and other communications provided for herein
(including, without limitation, any modifications of, or waivers or consents
under, this Agreement) shall be given or made by telegraph, telecopy (confirmed
by mail), cable or other writing and telecopied, telegraphed, cabled, mailed or
delivered to the intended recipient at the "Address for Notices" specified below
its name on the signature pages hereof (or provided for in an Assignment and
Acceptance); or, as to any party hereto, at such other address as shall be
designated by such party in a notice (given in accordance with this Section) (i)
as to any Borrower, to Agents, (ii) as to U.S. Agent, to U.S. Borrower and to
each U.S. Lender, (iii) as to Canadian Agent, to Canadian Borrower and to each
Canadian Lender, (iv) as to any U.S. Lender, to U.S. Borrower and Agents and (v)
as to any Canadian Lender, to Canadian Borrower and Agents. Except as otherwise
provided in this Agreement, all such notices or communications shall be deemed
to have been duly given when (a) transmitted by telecopier or delivered to the
telegraph or cable office, (b) personally delivered (c) one Business Day after
deposit with an overnight mail or delivery service, postage prepaid or (d) three
Business Days' after deposit in a receptacle maintained by the United States
Postal Service or Canada Post, as the case may be, postage prepaid, registered
or certified mail, return receipt requested, in each case given or addressed as
aforesaid.

         11.3 Expenses, Etc. Whether or not any Loan is ever made or any
Bankers' Acceptances ever accepted and purchased or any Letter of Credit ever
issued, Borrowers shall pay or reimburse within 10 Business Days after written
demand (a) any Agent for paying the reasonable fees and expenses of legal
counsel to such Agent, together with the reasonable fees and expenses of each
local counsel to such Agent, in connection with the preparation, negotiation,
execution and delivery of this Agreement (including the exhibits and schedules
hereto), the Security Documents and the other Loan Documents and the making of
the Loans and the acceptance and purchase of Bankers' Acceptances and the
issuance of Letters of Credit hereunder, and any modification, supplement or
waiver of any of the terms of this Agreement, the Letters of Credit or any
other Loan Document; (b) any Agent for any reasonable and customary search
fees, collateral audit fees, appraisal fees, survey fees, environmental study
fees, and title insurance costs and premiums; (c) any Agent for reasonable
out-of-pocket expenses incurred in connection with the preparation,
documentation, administration and syndication of the Loans or any of the Loan
Documents (including, without limitation, the advertising, marketing, printing,
publicity, duplicating, mailing and similar expenses) of the Loans and Letter
of Credit Liabilities; (d) Agent for paying all transfer, stamp, documentary or
other similar taxes, assessments or charges levied by any governmental or
revenue authority in respect of this Agreement, any Letter of Credit or any
other Loan Document or any other document referred to herein or therein; (e)
any Agent for paying all costs, expenses, taxes, assessments and other charges
incurred in connection with any filing, registration, recording or perfection
of any Lien contemplated by this Agreement, any Security Document or any
document referred to herein or therein, and (f) following the occurrence and
during the continuation of an Event of Default, any Lender or any Agent for
paying all amounts reasonably expended, advanced or incurred by such Lender or
such Agent to satisfy any obligation of any Obligor under this Agreement or any
other Loan Document, to protect the Collateral, to collect the Obligations or
to enforce, protect, preserve or defend the rights of the Lenders or Agents
under this Agreement or any other Loan Document, including, without limitation,
fees and expenses incurred in connection with such Lender's or such Agent's
participation as a member of a creditor's committee in a case commenced under
the Bankruptcy Code

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or other similar law, fees and expenses incurred in connection with lifting the
automatic stay prescribed in Section 362 of the Bankruptcy Code and fees and
expenses incurred in connection with any action pursuant to Section 1129 of the
Bankruptcy Code and all other reasonable and customary out-of-pocket expenses
incurred by such Lender or such Agent in connection with such matters, together
with interest thereon at the Past Due Rate applicable to U.S. Loans on each
such amount from the due date until the date of reimbursement to such Lender or
such Agent.

         11.4 Indemnification. Borrowers, jointly and severally, shall
indemnify each Agent, each Lender and each affiliate thereof and their
respective directors, officers, employees and agents from, and hold each of
them harmless against, any and all losses, liabilities, claims or damages to
which any of them may become subject, REGARDLESS OF WHETHER CAUSED IN WHOLE OR
IN PART BY THE NEGLIGENCE OF ANY INDEMNIFIED PARTIES, insofar as such losses,
liabilities, claims or damages arise out of or result from any (i) actual or
proposed use by any Borrower of the proceeds of any extension of credit
(whether a Loan, a Bankers' Acceptance or a Letter of Credit) by any Lender
hereunder; (ii) breach by any Obligor of this Agreement or any other Loan
Document; (iii) violation by any Obligor of any Legal Requirement, or (iv)
investigation, litigation or other proceeding relating to any of the foregoing,
and Borrowers, jointly and severally, shall reimburse each Agent, each Lender,
and each Affiliate thereof and their respective directors, officers, employees
and agents, upon demand for any reasonable and customary expenses (including
reasonable and customary legal fees) incurred in connection with any such
investigation or proceeding; provided, however, that none of the Borrowers
shall have any obligations pursuant to this Section with respect to any losses,
liabilities, claims, damages or expenses incurred by the Person seeking
indemnification by reason of the gross negligence or willful misconduct of that
Person or with respect to any disputes between or among any of Agents, Lenders
and Issuers. Nothing in this Section is intended to limit the obligations of
any Borrower under any other provision of this Agreement. Each Agent and each
Lender, respectively, shall indemnify Borrowers and hold Borrowers harmless
from and against the gross negligence or willful misconduct of such Agent or
such Lender, as the case may be. Nothing in this Section shall render Canadian
Borrower liable in respect of the U.S. Obligations. In the case of any
indemnification hereunder, the applicable Agent or the respective Lender, as
appropriate, shall give written notice to the applicable Borrower of any such
claim or demand being made against an indemnified person and the applicable
Borrower shall have the non-exclusive right to join in the defense against any
such claim or demand, provided that if such Borrower provides a defense, the
indemnified person shall bear its own cost of defense unless there is a
conflict of interests between such Borrower and such indemnified person. No
indemnified person may settle any claim to be indemnified without the consent
of the applicable Borrower, such consent not to be unreasonably withheld or
delayed.

         11.5 Amendments, Etc. No amendment or modification of this Agreement,
the Notes or any other Loan Document shall in any event be effective against
any Borrower or any other Obligor party thereto unless the same shall be agreed
or consented to in writing by such Person. No amendment, modification or waiver
of any provision of this Agreement, the Notes or any other Loan Document, nor
any consent to any departure by any Obligor therefrom, shall in any event be
effective against the Lenders unless the same shall be agreed or consented to
in writing by the Majority Lenders, and each such waiver or consent shall be
effective only in the specific instance and for the


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specific purpose for which given; provided, that no amendment, modification,
waiver or consent shall, unless in writing and signed by each Lender affected
thereby, do any of the following: (a) increase any U.S. Commitments or Canadian
Commitments of any of the Lenders (or reinstate any termination or reduction of
the U.S. Commitments or Canadian Commitments), or subject any of the Lenders to
any additional obligations; (b) reduce the principal of, or interest on, any
Loan, Reimbursement Obligation, fee or other amount due hereunder; (c) postpone
or extend the Revolving Loan Maturity Date, the Term Loan Maturity Date, the
Termination Date, the Availability Period or any scheduled date fixed for any
payment of principal of, or interest on, any Loan, Reimbursement Obligation,
fee or other sum to be paid hereunder or waive any Event of Default described
in Section 9.1(a) hereof; (d) change the percentage of any of the U.S.
Commitments or Canadian Commitments, as the case may be, or of the aggregate
unpaid principal amount of Obligations, or the percentage of Lenders, which
shall be required for the Lenders or any of them to take any action under this
Agreement; (e) change any provision contained in Sections 2.2(c), 7.9, 11.3 or
11.4 hereof or this Section 11.5; (f) release any Person from liability under a
Guaranty or release all or substantially all of the security for the
Obligations or release Collateral (exclusive of Collateral with respect to
which any Agent is obligated to provide a release pursuant to this Agreement or
any of the other Loan Documents or by law) in any one (1) calendar year
ascribed an aggregate value on the most recent financial statements of the
applicable Borrower delivered to Agents in excess of $1,000,000; (g) increase
any of the fixed percentages to be multiplied by the aggregate amounts of the
components comprising the U.S. Borrowing Base or the Canadian Borrowing Base
that are described in (i) and (ii) of the definition of the U.S. Borrowing Base
and the Canadian Borrowing Base herein, or (h) modify the provisions of
Sections 4.1(b) or 4.2 hereof regarding pro rata application of amounts after
an Event of Default shall have occurred and be continuing. Notwithstanding
anything in this Section 11.5 to the contrary, no amendment, modification,
waiver or consent shall be made with respect to Section 10 without the consent
of U.S. Agent to the extent it affects U.S. Agent, as U.S. Agent or Canadian
Agent to the extent it affects Canadian Agent, as Canadian Agent.

         11.6 Successors and Assigns.

         (a) This Agreement shall be binding upon and inure to the benefit of
Borrowers, Agents and the Lenders and their respective successors and assigns;
provided, however, that, except as permitted by Section 8.4 hereof, no Borrower
may assign or transfer any of its rights or obligations hereunder without the
prior written consent of all of the Lenders, and any such assignment or
transfer without such consent shall be null and void. Each Lender may sell
participations to any Person in all or part of any Loan or Bankers' Acceptance,
or all or part of its Notes, U.S. Commitments or Canadian Commitments, as the
case may be, or interests in Letters of Credit or Bankers' Acceptances, in
which event, without limiting the foregoing, the provisions of the Loan
Documents shall inure to the benefit of each purchaser of a participation;
provided, however, the pro rata treatment of payments, as described in Section
4.2 hereof and rights to compensation under Section 3.3 hereof, shall be
determined as if such Lender had not sold such participation. No Lender that
sells one or more participations to any Person shall be relieved by virtue of
such participation from any of its obligations to Borrowers under this
Agreement. In the event any Lender shall sell any participation, such Lender
shall retain the sole right and responsibility to enforce the obligations of




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Borrowers hereunder, including, without limitation, the right to approve any
amendment, modification or waiver of any provision of this Agreement other than
amendments, modifications or waivers with respect to (i) any fees payable
hereunder to the Lenders, (ii) the amount of principal or the rate of interest
payable on, or the dates fixed for the scheduled repayment of principal of, any
of the Obligations and (iii) the release of the Liens on all or substantially
all of the Collateral.

         (b) Each U.S. Lender may assign to one or more U.S. Lenders or any
other Person all or a portion of its interests, rights and obligations under
this Agreement; provided, however, that (i) the aggregate amount of the U.S.
Commitments and Term Loans of the assigning U.S. Lender subject to each such
assignment shall in no event be less than $5,000,000 and (ii) other than in the
case of an assignment to another U.S. Lender (that is, at the time of the
assignment, a party hereto) or to an Affiliate of such U.S. Lender or to a
Federal Reserve Bank, Agents and, so long as no Event of Default shall have
occurred and be continuing, U.S. Borrower must each give its prior written
consent, which consents shall not be unreasonably withheld. Each Canadian
Lender may assign to one or more Canadian Lenders or any other Person all or a
portion of its interests, rights and obligations under this Agreement;
provided, however, that (i) the aggregate amount of the Canadian Commitments of
the assigning Canadian Lender subject to each such assignment shall in no event
be less than $5,000,000 and (ii) other than in the case of an assignment to
another Canadian Lender (that is, at the time of the assignment, a party
hereto) or to an Affiliate of such Canadian Lender, Agents and, so long as no
Event of Default shall have occurred and be continuing, Canadian Borrower must
each give its prior written consent, which consents shall not be unreasonably
withheld. As a condition precedent to any such assignment, the parties to each
such assignment shall execute and deliver to the applicable Agent, for its
acceptance an Assignment and Acceptance in substantially the form of Exhibit E
hereto (each an "Assignment and Acceptance") with blanks appropriately
completed, together with any Note or Notes subject to such assignment and a
processing and recording fee of $3,000 paid by the assignee (for which
Borrowers will have no liability). Upon such execution, delivery and
acceptance, from and after the effective date specified in each Assignment and
Acceptance, (A) the assignee thereunder shall be a party hereto and, to the
extent provided in such Assignment and Acceptance, have the rights and
obligations of a Lender hereunder and (B) the Lender thereunder shall, to the
extent provided in such Assignment and Acceptance, be released from its
obligations under this Agreement (and, in the case of an Assignment and
Acceptance covering all or the remaining portion of an assigning Lender's
rights and obligations under this Agreement, such Lender shall cease to be a
party hereto except in respect of provisions of this Agreement which survive
payment of the Obligations and termination of the U.S. Commitments or Canadian
Commitments, as the case may be). Notwithstanding anything contained in this
Agreement to the contrary, any Lender may at any time assign all or any portion
of its rights under this Agreement and the other Loan Documents as collateral
to a Federal Reserve Bank; provided that no such assignment shall release such
Lender from any of its obligations hereunder.

         (c) By executing and delivering an Assignment and Acceptance, the
Lender assignor thereunder and the assignee thereunder confirm to and agree
with each other and the other parties hereto as follows: (i) other than the
representation and warranty that it is the legal and beneficial owner of the
interest being assigned thereby free and clear of any adverse claim, such
Lender assignor makes no representation or warranty and assumes no
responsibility with respect to any


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<PAGE>   91

statements, warranties or representations made in or in connection with this
Agreement or any of the other Loan Documents or the execution, legality,
validity, enforceability, genuineness, sufficiency or value of this Agreement
or any of the other Loan Documents or any other instrument or document
furnished pursuant thereto; (ii) such Lender assignor makes no representation
or warranty and assumes no responsibility with respect to the financial
condition of any Borrower or any Obligor or the performance or observance by
any Borrower or any Obligor of any of its obligations under this Agreement or
any of the other Loan Documents to which it is a party or any other instrument
or document furnished pursuant hereto; (iii) such assignee confirms that it has
received a copy of this Agreement, together with copies of the financial
statements most recently delivered under either Section 6.2 or Section 7.2
hereof and such other documents and information as it has deemed appropriate to
make its own credit analysis and decision to enter into such Assignment and
Acceptance; (iv) such assignee will, independently and without reliance upon
any Agent, such Lender assignor or any other Lender and based on such documents
and information as it shall deem appropriate at the time, continue to make its
own credit decisions in taking or not taking action under this Agreement and
the other Loan Documents; (v) such assignee appoints and authorizes U.S. Agent
or Canadian Agent, as the case may be, to take such action as agent on its
behalf and to exercise such powers under this Agreement and the other Loan
Documents as are delegated to such Agent by the terms hereof, together with
such powers as are reasonably incidental thereto; and (vi) such assignee agrees
that it will perform in accordance with their terms all obligations that by the
terms of this Agreement and the other Loan Documents are required to be
performed by it as a Lender.

         (d) The entries in the records of each applicable Agent as to each
Assignment and Acceptance delivered to it and the names and addresses of the
Lenders and the U.S. Commitments or Canadian Commitments of, and principal
amount of the Obligations owing to, each Lender from time to time shall be
conclusive, in the absence of manifest error, and Obligors, Agents and the
Lenders may treat each Person the name of which is recorded in the books and
records of the applicable Agent as a Lender hereunder for all purposes of this
Agreement and the other Loan Documents.

         (e) Upon the applicable Agent's receipt of an Assignment and
Acceptance executed by an assigning Lender and the assignee thereunder,
together with any Note or Notes subject to such assignment and the written
consent to such assignment (to the extent consent is required), such Agent
shall, if such Assignment and Acceptance has been completed with blanks
appropriately filled, (i) accept such Assignment and Acceptance, (ii) record
the information contained therein in its records and (iii) give prompt notice
thereof to the applicable Borrower. Within five Business Days after receipt of
notice, the applicable Borrower, at its own expense, shall execute and deliver
to the applicable Agent new Notes payable to the order of such assignee in the
appropriate amounts and, if the assigning Lender has retained U.S. Commitments
or Canadian Commitments, as the case may be, or Term Loans hereunder, new Notes
to the order of the assigning Lender in the appropriate amounts. Such new Notes
shall be dated the effective date of such Assignment and Acceptance and shall
otherwise be in the forms required hereunder. Thereafter, the replaced Notes
shall be surrendered to the applicable Agent by the applicable Lender or
Lenders, marked renewed and substituted and the originals thereof delivered to
the applicable Borrower (with copies to be retained by the applicable Agent).



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<PAGE>   92

         (f) Any Lender may, in connection with any assignment or participation
or proposed assignment or participation pursuant to this Section 11.6, disclose
to the assignee or participant or proposed assignee or participant, any
information relating to any Borrower furnished to such Lender by or on behalf
of any Borrower; provided such Person agrees to maintain the confidentiality of
such information in accordance with Section 11.18.

         11.7 Limitation of Interest. U.S. Borrower and the U.S. Lenders intend
to strictly comply with all applicable usury laws of the United States and
Texas (or the usury laws of any jurisdiction, including Canada, whose usury
laws are deemed to apply to the Notes or any other Loan Documents despite the
intention and desire of the parties to apply the usury laws of the State of
Texas). Canadian Borrower and the Canadian Lenders intend to strictly comply
with all applicable usury laws of Canada and Ontario (or the usury laws of any
jurisdiction, including the State of Texas, whose usury laws are deemed to
apply to the Notes or any other Loan Documents despite the intention and desire
of the parties to apply the usury laws of Ontario and Canada). Accordingly, the
provisions of this Section 11.7 shall govern and control over every other
provision of this Agreement or any other Loan Document which conflicts or is
inconsistent with this Section, even if such provision declares that it
controls. As used in this Section, the term "interest" includes the aggregate
of all charges, fees, benefits or other compensation which constitute interest
under applicable law, provided that, to the maximum extent permitted by
applicable law, (a) any non-principal payment shall be characterized as an
expense or as compensation for something other than the use, forbearance or
detention of money and not as interest and (b) all interest at any time
contracted for, reserved, charged or received shall be amortized, prorated,
allocated and spread, in equal parts during the full term of the Obligations.
In no event shall Borrowers or any other Person be obligated to pay, or any
Agent, any Issuer or any Lender have any right or privilege to reserve, receive
or retain, (a) any interest in excess of the maximum amount of nonusurious
interest permitted under applicable laws or (b) total interest in excess of the
amount which such Person could lawfully have contracted for, reserved,
received, retained or charged had the interest been calculated for the full
term of the Obligations at the Ceiling Rate. To the maximum extent permitted by
applicable law, the daily interest rates to be used in calculating interest at
the Ceiling Rate shall be determined by dividing the applicable Ceiling Rate
per annum by the number of days in the calendar year for which such calculation
is being made. None of the terms and provisions contained in this Agreement or
in any other Loan Document (including, without limitation, Section 9.1 hereof)
which directly or indirectly relate to interest shall ever be construed without
reference to this Section 11.7, or be construed to create a contract to pay for
the use, forbearance or detention of money at an interest rate in excess of the
Ceiling Rate. If the term of any Obligation is shortened by reason of
acceleration of maturity as a result of any Default or by any other cause, or
by reason of any required or permitted prepayment, and if for that (or any
other) reason any Agent, any Issuer or any Lender at any time, including but
not limited to, the stated maturity, is owed or receives (and/or has received)
interest in excess of interest calculated at the Ceiling Rate, then and in any
such event all of any such excess interest shall be canceled automatically as
of the date of such acceleration, prepayment or other event which produces the
excess, and, if such excess interest has been paid to such Person, it shall be
credited pro tanto against the then-outstanding principal balance of the
applicable Borrower's obligations to such Person, effective as of the date or
dates when the event occurs which causes it to be excess interest, until such
excess is exhausted or all of such principal has been fully paid and


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<PAGE>   93

satisfied, whichever occurs first, and any remaining balance of such excess
shall be promptly refunded to its payor.

         11.8 Survival. The obligations of Borrowers under Sections 2.2(c),
2.2(d), 7.9, 11.3 and 11.4 hereof and all other obligations of Borrowers in any
other Loan Document (to the extent stated therein), the obligations of each
Issuer under the last sentence of Section 2.2(b)(iii) and the obligations of
the Lenders under Sections 4.1(d), 10.6, 11.7, 11.13 and 11.18 hereof, shall,
notwithstanding anything herein to the contrary, survive the repayment of the
Loans and Reimbursement Obligations and the termination of the U.S.
Commitments, the Canadian Commitments and the Letters of Credit.

         11.9 Captions. Captions and section headings appearing herein are
included solely for convenience of reference and are not intended to affect the
interpretation of any provision of this Agreement.

         11.10 Counterparts. This Agreement may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
agreement and any of the parties hereto may execute this Agreement by signing
any such counterpart.

         11.11 Governing Law. THIS AGREEMENT AND (EXCEPT AS THEREIN PROVIDED)
THE OTHER LOAN DOCUMENTS SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
THE APPLICABLE LAWS OF THE STATE OF TEXAS AND THE UNITED STATES OF AMERICA FROM
TIME TO TIME IN EFFECT; PROVIDED, HOWEVER, THAT, EXCEPT AS MAY BE REQUIRED
UNDER APPLICABLE LAWS, THE USURY LAWS OF THE STATE OF TEXAS OR THE UNITED
STATES OF AMERICA SHALL NOT APPLY TO LOANS MADE TO AND BANKERS ACCEPTANCES
ACCEPTED IN CANADA BY CANADIAN LENDERS DRAWN BY CANADIAN BORROWER, BUT RATHER
THE USURY LAWS OF THE PROVINCE OF ONTARIO AND THE FEDERAL LAWS OF CANADA
APPLICABLE THEREIN SHALL GOVERN IN SUCH CONTEXT.

         11.12 Severability. Whenever possible, each provision of the Loan
Documents shall be interpreted in such manner as to be effective and valid
under applicable law. If any provision of any Loan Document shall be invalid,
illegal or unenforceable in any respect under any applicable law, the validity,
legality and enforceability of the remaining provisions of such Loan Document
shall not be affected or impaired thereby.

         11.13 Tax Forms; Net Payments.

         (a) Each U.S. Lender which is organized under the laws of a
jurisdiction outside the United States shall, on the day of the initial
borrowing from each such U.S. Lender hereunder and from time to time thereafter
if requested by U.S. Borrower or U.S. Agent, provide U.S. Agent and U.S.
Borrower with the forms prescribed by the Internal Revenue Service of the United
States certifying as to such U.S. Lender's status for purposes of determining
exemption from United States

                                       88

<PAGE>   94
withholding taxes with respect to all payments to be made to such U.S. Lender
hereunder or other documents satisfactory to such U.S. Lender, U.S. Borrower and
U.S. Agent indicating that all payments to be made to such U.S. Lender hereunder
are not subject to United States withholding tax or are subject to such tax at a
rate reduced by an applicable tax treaty. Unless U.S. Borrower and U.S. Agent
shall have received such forms or such documents indicating that payments to
such U.S. Lender hereunder are not subject to United States withholding tax or
are subject to such tax at a rate reduced by an applicable tax treaty, U.S.
Borrower and U.S. Agent shall be entitled to withhold taxes from such payments
at the applicable statutory rate.

         (b) Each Canadian Lender is a resident of Canada for purposes of the
Income Tax Act (Canada).

         11.14 Interest Act (Canada). Whenever interest is calculated on the
basis of a year of 360 or 365 days, for the purposes of the Interest Act
(Canada), the yearly rate of interest which is equivalent to the rate payable
hereunder is the rate payable multiplied by the actual number of days in the
year and divided by 360 or 365, as the case may be. All interest will be
calculated using the nominal rate method and not the effective rate method and
the deemed reinvestment principle shall not apply to such calculations.

         11.15 Judgment Currency. The obligation of each Borrower to make
payments on any Obligation to the Lenders or to any Agent hereunder in any
currency (the "first currency") shall not be discharged or satisfied by any
tender or recovery pursuant to any judgment expressed in or converted into any
other currency (the "second currency") except to the extent to which such
tender or recovery shall result in the effective receipt by the applicable
Lender or the applicable Agent of the full amount of the first currency
payable, and accordingly the primary obligation of each Borrower shall be
enforceable as an alternative or additional cause of action for the purpose of
recovery in the second currency of the amount (if any) by which such effective
receipt shall fall short of the full amount of the first currency payable and
shall not be affected by a judgment being obtained for any other sum due
hereunder.

         11.16 Conflicts Between This Agreement and the Other Loan Documents.
In the event of any conflict between the terms of this Agreement and the terms
of any of the other Loan Documents, the terms of this Agreement shall control.

         11.17 Limitation on Charges; Substitute Lenders; Non-Discrimination.
Anything in Sections 2.2(d), 3.3(c) or 7.9 notwithstanding:

                  (1) No Borrower shall be required to pay to any Lender
         reimbursement or indemnification with regard to any costs or expenses
         described in such Sections, unless such Lender notifies the applicable
         Borrower of such costs or expenses within 90 days after the date paid
         or incurred;

                  (2) none of the Lenders shall be permitted to pass through to
         any Borrower charges and costs under such Sections on a discriminatory
         basis (i.e., which are not also


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<PAGE>   95

         passed through by such Lender to other customers of such Lender
         similarly situated where such customer is subject to documents
         providing for such pass through); and

                  (3) if any Lender elects to pass through to any Borrower any
         material charge or cost under such Sections or elects to terminate the
         availability of LIBOR Borrowings for any material period of time, the
         applicable Borrower may, within 60 days after the date of such event
         and so long as no Default shall have occurred and be continuing, elect
         to terminate such Lender as a party to this Agreement; provided that,
         concurrently with such termination such Borrower shall (i) if Agents
         and each of the other Lenders shall consent, pay that Lender all
         principal, interest and fees and other amounts owed to such Lender
         through such date of termination or (ii) have arranged for another
         financial institution approved by Agents (such approval not to be
         unreasonably withheld or delayed) as of such date, to become a
         substitute Lender for all purposes under this Agreement in the manner
         provided in Section 11.6; provided further that, prior to substitution
         for any Lender, the applicable Borrower shall have given written
         notice to Agents of such intention and the Lenders shall have the
         option, but no obligation, for a period of 60 days after receipt of
         such notice, to increase their U.S. Commitments or Canadian
         Commitments, as the case may be, in order to replace the affected
         Lender in lieu of such substitution.

         11.18 Confidentiality. Each Lender agrees to exercise its best efforts
to keep any information delivered or made available by any Obligor which is
clearly indicated to be confidential information, confidential from anyone
other than Persons employed or retained by such Lender or any of its Affiliates
who are or are expected to become engaged in evaluating, approving, structuring
or administering the Obligations; provided that nothing herein shall prevent
any Lender from disclosing such information (a) to any other Lender; (b)
pursuant to subpoena or upon the order of any court or administrative agency;
(c) upon the request or demand of any regulatory agency or authority having
jurisdiction over such Lender; (d) which has been publicly disclosed; (e) to
the extent reasonably required in connection with any litigation to which any
Agent, any Lender, any Obligor or their respective Affiliates may be a party;
(f) to the extent reasonably required in connection with the exercise of any
remedy hereunder; (g) to such Lender's bank counsel and independent auditors;
and (h) to any actual or proposed participant or assignee of all or part of its
rights hereunder which has agreed in writing to be bound by the provisions of
this Section.

         11.19 Amendment and Restatement. This Agreement amends and restates in
entirety that certain Loan Agreement dated June 30, 1997 executed by and among
U.S. Borrower, Chase Bank of Texas, National Association (formerly known as
Texas Commerce Bank National Association), as Agent and certain lenders therein
named, as the same may have been amended.


                  [REMAINDER OF PAGE LEFT BLANK INTENTIONALLY]

                                       90

<PAGE>   96

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the Effective Date.

                           NATIONAL TANK COMPANY,
                           a Delaware corporation


                           By: /s/ WILLIAM B. WIENER, III
                              ------------------------------------------------
                               William B. Wiener, III, Senior Vice President




                           NATCO CANADA, LTD., a corporation formed
                           under the laws of the Province of Ontario


                           By: /s/ WILLIAM B. WIENER, III
                              ------------------------------------------------
                               William B. Wiener, III, Senior Vice President


                           Address for Notices:

                           Brookhollow Central III
                           2950 North Loop West, Suite 750
                           Houston, Texas 77092
                           Attention: William B. Wiener, III
                           Telecopy No.: (713) 683-7841


                                       91

<PAGE>   97


                           CHASE BANK OF TEXAS, NATIONAL
                           ASSOCIATION, as U.S. Agent, Issuer of U.S. Letters
                           of Credit and a U.S. Lender


                           By: /s/ MONA M. FOCH
                              ------------------------------------------------
                                   Mona M. Foch, Senior Vice President

                           Address for Notices:

U.S. Commitment:           712 Main Street
                           Houston, Texas 77002
$10,697,247.71             Attention:  Manager, Structured Finance - Oil Service
                           Telecopy No.:  (713) 216-6710

                           with a copy to:
Canadian Commitment:
                           Ms. Muniram Appanna
$0                         The Chase Manhattan Bank
                           One Chase Manhattan Plaza, 8th Floor
                           New York, New York 10081
Term Loans:                Telecopy No.: (212) 552-5777

$15,802,752.29






                                       92

<PAGE>   98

                           THE BANK OF NOVA SCOTIA,
                           as Canadian Agent, Issuer of Canadian Letters
                           of Credit and a Canadian Lender


                           By: /s/ SUSAN DE ST. GORRE
                              -------------------------------------------------
                           Name:  Susan De St. Gorre
                                -----------------------------------------------
                           Title:  Account Manager
                                 ----------------------------------------------

                           Address for Notices:

U.S. Commitment:           1100 Louisiana, Suite 3000
                           Houston, TX  77002
$0                         Attention: Mr. Mark Ammerman
                           Telecopy: (713) 752-2425

Canadian Commitment:       with a copy to:

$10,000,000                The Bank of Nova Scotia
                           Calgary Commercial Banking Centre
Term Loans:                240-8 Ave. S.W.
                           Calgary, Alberta T2P 2N7
$0                         Attention: Ms. Susan de St. Jorre
                           Telecopy No.: (403) 221-6450




                                       93

<PAGE>   99

                           THE BANK OF NOVA SCOTIA,
                           as a U.S. Lender


                           By: /s/ F.C.H. ASHBY
                              -------------------------------------------------
                           Name:  F.C.H. Ashby
                                -----------------------------------------------
                           Title:  Senior Manager
                                 ----------------------------------------------

                           Address for Notices:

U.S. Commitment:           1100 Louisiana, Suite 3000
                           Houston, TX  77002
$2,018,348.62              Attention: Mr. Mark Ammerman
                           Telecopy: (713) 752-2425

Canadian Commitment:       with a copy to:

$0                         The Bank of Nova Scotia
                           Calgary Commercial Banking Centre
Term Loans:                240-8 Ave. S.W.
                           Calgary, Alberta T2P 2N7
$2,981,651.38              Attention: Ms. Susan de St. Jorre
                           Telecopy No.: (403) 221-6450




                                       94

<PAGE>   100

                           WELLS FARGO BANK (TEXAS), NATIONAL
                           ASSOCIATION


                           By: /s/ FRANK W. SCHAGEMAN
                              -------------------------------------------------
                           Name:  Frank W. Schageman
                                -----------------------------------------------
                           Title:  Vice President
                                 ----------------------------------------------

                           Address for Notices:

U.S. Commitment:           1000 Louisiana, 3rd Floor
                           Houston, TX  77002
$2,018,348.62              Attention: Mr. Frank Schageman
                           Telecopy: (713) 739-1087

Canadian Commitment:

$0

Term Loans:

$2,981,651.38


                                       95

<PAGE>   101

                           BANK ONE, TEXAS, N.A.


                           By: /s/ KAREN S. SHOUSE
                              -------------------------------------------------
                           Name:  Karen S. Shouse
                                -----------------------------------------------
                           Title:  Vice President
                                 ----------------------------------------------

                           Address for Notices:

U.S. Commitment:           910 Travis, 7th Floor
                           Houston, TX  77002
$7,266,055.05              Attention: Ms. Karen Shouse
                           Telecopy: (713) 751-6199

Canadian Commitment:

$0

Term Loans:

$10,733,944.95



                                       96

<PAGE>   102


         NATCO Group Inc. joins in the execution hereof for the purpose of (i)
acknowledging the representations, warranties, covenants and agreements set
forth herein which relate to it, (ii) agreeing to be bound by the covenants and
agreements set forth herein which relate to it and (iii) confirming the
accuracy of the representations and warranties set forth herein which relate to
it.

                             NATCO GROUP INC.,
                             a Delaware corporation


                             By: /s/ WILLIAM B. WIENER, III
                                -----------------------------------------------
                                William B. Wiener, III, Senior Vice President




                                      97
<PAGE>   103
                          AMENDMENT TO LOAN AGREEMENT


         THIS AMENDMENT TO LOAN AGREEMENT (this "Amendment") is made and
entered into as of June 30, 1999 by and among NATIONAL TANK COMPANY, a Delaware
corporation (the "U.S. Borrower"); NATCO CANADA, LTD., a corporation formed
under the laws of the Province of Ontario (the "Canadian Borrower"); each of
the Lenders which is or may from time to time become a party to the Loan
Agreement (as defined below) (individually, a "Lender" and, collectively, the
"Lenders"), CHASE BANK OF TEXAS, N. A., a national banking association
(previously known as Texas Commerce Bank National Association), acting as agent
for the U.S. Lenders (in such capacity, together with its successors in such
capacity, the "U.S. Agent"), and THE BANK OF NOVA SCOTIA, as agent for the
Canadian Lenders (in such capacity, together with its successors in such
capacity, the "Canadian Agent"). The U.S. Borrower and the Canadian Borrower
are herein collectively called the "Borrowers" and the U.S. Agent and the
Canadian Agent are herein collectively called the "Agents".

                                    RECITALS

         A. The Borrowers, the Lenders and the Agents executed and delivered
that certain Loan Agreement (the "Loan Agreement") dated as of November 20,
1998. Any capitalized term used in this Amendment and not otherwise defined
shall have the meaning ascribed to it in the Loan Agreement.

         B. The Borrowers, the Lenders and the Agents desire to amend the Loan
Agreement in certain respects.

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements, representations and warranties herein set forth, and further good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the Borrowers, the Lenders and the Agents do hereby agree as
follows:

         SECTION 1.      Amendments to Loan Agreement. On and after the
Amendment Effective Date, the Loan Agreement shall be amended as follows:

         (a) The definition of "Capital Expenditures" set forth in Section 1.1
of the Loan Agreement is hereby amended to read in its entirety as follows:

                  Capital Expenditures means, with respect to any Person for
         any period, expenditures in respect of fixed or capital assets by such
         Person, including capital lease obligations incurred during such
         period (to the extent not already included), which would be reflected
         as additions to Property, plant or equipment on a balance sheet of
         such Person and its consolidated Subsidiaries, if any, prepared in
         accordance with GAAP; but excluding (i) expenditures during such
         period for the repair or replacement of any fixed or capital asset


<PAGE>   104



         which was destroyed, damaged or taken, in whole or in part, to the
         extent financed by the proceeds of an insurance policy maintained by
         such Person or the proceeds of a condemnation award and (ii) capital
         expenditures in the amount of $897,000.00 incurred during the
         nine-month period ending June 30, 1999 related to the expansion of
         plants of The Cynara Company and the Borrowers.

         (b) The definition of "U.S. Borrowing Base" set forth in Section 1.1
of the Loan Agreement is hereby amended to read in its entirety as follows:

                  U.S. Borrowing Base means, as at any date, the amount of the
         U.S. Borrowing Base shown on the Borrowing Base Certificate then most
         recently delivered pursuant to Section 7.2(b) hereof, determined by
         calculating the amount equal to:

                  (i)      80% of the aggregate amount of all Eligible Accounts
                           of U.S. Borrower and its Subsidiaries (other than
                           Canadian Subsidiaries) at said date, plus

                  (ii)     the sum of (w) 75% of that portion of Eligible
                           Inventory of Test, Inc. at said date (determined at
                           the lower of cost or market on a consistent basis)
                           which consists of costs in excess of billings for
                           time and material contracts and which relate to
                           signed time and material tickets, (x) 20% of that
                           portion of Eligible Inventory of U.S. Borrower and
                           its Subsidiaries (other than Canadian Subsidiaries)
                           at said date (determined at the lower of cost or
                           market on a consistent basis) which consists of used
                           finished goods, (y) 25% of that portion of Eligible
                           Inventory of U.S. Borrower and its Subsidiaries
                           (other than Canadian Subsidiaries) at said date
                           (determined at the lower of cost or market on a
                           consistent basis) which consists of work-in- process
                           relating to projects for customers that are not
                           account debtors with respect to any Accounts owing
                           to U.S. Borrower and its Subsidiaries (other than
                           Canadian Subsidiaries) which are not Eligible
                           Accounts and (z) 50% of the aggregate amount of all
                           other Eligible Inventory of U.S. Borrower and its
                           Subsidiaries (other than Canadian Subsidiaries) at
                           said date (determined at the lower of cost or market
                           on a consistent basis); provided that the amount
                           calculated pursuant to this clause (ii) shall not
                           exceed 50% of the U.S. Borrowing Base.

         In the absence of a current Borrowing Base Certificate, U.S. Agent
         shall determine the U.S. Borrowing Base from time to time in its
         reasonable discretion, taking into account all information reasonably
         available to it, and the U.S. Borrowing Base from time to time so
         determined shall be the Borrowing Base for all purposes of this
         Agreement until a current Borrowing Base Certificate, in Proper Form,
         is furnished to and accepted by U.S. Agent.

                                       2

<PAGE>   105




         (c) Section 7.3 of the Loan Agreement is hereby amended to read in its
entirety as follows:

                  7.3      Financial Tests.  Have and maintain:

                           (a) Net Worth - Net Worth of not less than (1) at
                  all times during the period commencing on June 30, 1999
                  through and including September 30, 1999, an amount equal to
                  $30,000,000 and (2) at all times during each fiscal quarter
                  thereafter, the sum of $30,000,000 plus 50% of the net income
                  of U.S. Borrower and its Subsidiaries, on a consolidated
                  basis (if positive), for the period from June 30, 1999
                  through the last day of the fiscal quarter ending immediately
                  prior to the date of such calculation, plus 100% of the net
                  proceeds realized from the issuance of any equity securities
                  by U.S. Borrower during that period plus 100% of Net Equity
                  Proceeds received during that period.

                           (b) Debt to Capitalization Ratio - a Debt to
                  Capitalization Ratio of not greater than (1) 60% at all times
                  during the period commencing on June 30, 1999 through and
                  including March 31, 2000; (2) 55% at all times during the
                  period commencing on April 1, 2000 through and including June
                  30, 2000; (3) 50% at all times during the period commencing
                  on July 1, 2000 through and including December 31, 2000, and
                  (4) 45% at all times thereafter.

                           (c) Fixed Charge Coverage Ratio - a Fixed Charge
                  Coverage Ratio of not less than (1) 1.00 to 1.00 at all times
                  during the period commencing on June 30, 1999 through and
                  including December 31, 1999; (2) 1.10 to 1.00 at all times
                  during the period commencing on January 1, 2000 through and
                  including March 31, 2000 and (3) 1.25 to 1.00 at all times
                  thereafter.

         (d) Section 8.10 of the Loan Agreement is hereby amended to read in
its entirety as follows:

                  8.10 Key Agreements. Terminate or agree to the termination of
         any Key Agreement or amend, modify or obtain or grant a waiver of any
         provision of any of the Key Agreements if such action could reasonably
         be expected to have a Material Adverse Effect (provided that no
         consent of any Agent or any Lender shall be required with respect to
         an amendment of the EXIM Facility which has the sole effect of
         increasing the EXIM Facility to an amount not greater than
         $12,500,000).

         SECTION 2.      Ratification. Except as expressly amended by this
Amendment, the Loan Agreement and the other Loan Documents shall remain in full
force and effect. None of the rights, title and interests existing and to exist
under the Loan Agreement are hereby released, diminished

                                       3

<PAGE>   106



or impaired, and the Borrowers hereby reaffirm all covenants, representations
and warranties in the Loan Agreement.

         SECTION 3.      Expenses. The Borrowers shall pay to the Agents all
reasonable fees and expenses of their respective legal counsel (pursuant to
Section 11.3 of the Loan Agreement) incurred in connection with the execution
of this Amendment.

         SECTION 4.      Certifications. The Borrowers hereby certify that (a)
no event which could reasonably be expected to have a Material Adverse Effect
has occurred and is continuing and (b) no Default or Event of Default has
occurred and is continuing or will occur as a result of this Amendment.

         SECTION 5.      Miscellaneous. This Amendment (a) shall be binding upon
and inure to the benefit of the Borrowers, the Lenders and the Agents and their
respective successors, assigns, receivers and trustees; (b) may be modified or
amended only by a writing signed by the required parties; (c) shall be governed
by and construed in accordance with the laws of the State of Texas and the
United States of America; (d) may be executed in several counterparts by the
parties hereto on separate counterparts, and each counterpart, when so executed
and delivered, shall constitute an original agreement, and all such separate
counterparts shall constitute but one and the same agreement and (e) together
with the other Loan Documents, embodies the entire agreement and understanding
between the parties with respect to the subject matter hereof and supersedes
all prior agreements, consents and understandings relating to such subject
matter. The headings herein shall be accorded no significance in interpreting
this Amendment.

            NOTICE PURSUANT TO TEX. BUS. & COMM. CODE SECTION 26.02

         THE LOAN AGREEMENT, AS AMENDED BY THIS AMENDMENT, AND ALL OTHER LOAN
DOCUMENTS EXECUTED BY ANY OF THE PARTIES PRIOR HERETO OR SUBSTANTIALLY
CONCURRENTLY HEREWITH CONSTITUTE A WRITTEN LOAN AGREEMENT WHICH REPRESENTS THE
FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF
PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE
NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.


                                       4

<PAGE>   107



         IN WITNESS WHEREOF, the Borrowers, the Lenders and the Agents have
caused this Amendment to be signed by their respective duly authorized
officers, effective as of the date first above written.

                                NATIONAL TANK COMPANY,
                                a Delaware corporation


                                By: /s/ STEPHEN J. GOODLAND
                                   ------------------------------------------
                                Name:   Stephen J. Goodland
                                     ----------------------------------------
                                Title:  Vice President - Finance and Accounting
                                      ---------------------------------------




                                NATCO CANADA, LTD., a corporation formed
                                under the laws of the Province of Ontario


                                By: /s/ CALVIN BOETTCHER
                                   ------------------------------------------
                                Name:   Calvin Boettcher
                                     ----------------------------------------
                                Title:  Controller
                                      ---------------------------------------

                                       5

<PAGE>   108



                                CHASE BANK OF TEXAS,  NATIONAL
                                ASSOCIATION, as U.S. Agent, Issuer of U.S.
                                Letters of Credit and a U.S. Lender


                                By: /s/ MONA M. FOCH
                                   ------------------------------------------
                                Name:   Mona M. Foch
                                     ----------------------------------------
                                Title:  Managing Director
                                      ---------------------------------------




                                       6

<PAGE>   109



                                THE BANK OF NOVA SCOTIA,
                                as Canadian Agent, Issuer of Canadian Letters
                                of Credit and a Canadian Lender


                                By: /s/ SUSAN DE ST. GORRE
                                   ------------------------------------------
                                Name:   Susan De St. Gorre
                                     ----------------------------------------
                                Title:  Account Manager
                                      ---------------------------------------






                                       7

<PAGE>   110



                                THE BANK OF NOVA SCOTIA,
                                as a U.S. Lender


                                By: /s/ F.C.H. ASHBY
                                   ------------------------------------------
                                Name:   F.C.H. Ashby
                                     ----------------------------------------
                                Title:  Senior Manager
                                      ---------------------------------------





                                       8

<PAGE>   111



                                WELLS FARGO BANK (TEXAS), NATIONAL
                                ASSOCIATION


                                By: /s/ BRET C. WEST
                                   ------------------------------------------
                                Name:   Bret C. West
                                     ----------------------------------------
                                Title:  Vice President
                                      ---------------------------------------



                                       9

<PAGE>   112



                                BANK ONE, TEXAS, N.A.


                                By: /s/ KAREN SHOUSE
                                   ------------------------------------------
                                Name:   Karen Shouse
                                     ----------------------------------------
                                Title:  Vice President
                                      ---------------------------------------


                                       10

<PAGE>   113


         The undersigned hereby join in this Amendment to evidence their
consent to execution by Borrowers of this Amendment, to confirm that each Loan
Document now or previously executed by the undersigned applies and shall
continue to apply to the Loan Agreement, as amended hereby, to acknowledge that
without such consent and confirmation, Lender would not execute this Amendment
and to join in the notice pursuant to Tex. Bus. & Comm. Code Section 26.02 set
forth above.


                                TOTAL ENGINEERING SERVICES TEAM, INC., a
                                Louisiana corporation, TEST, INC., a
                                Louisiana corporation, NATCO LONDON, INC.,
                                a Delaware corporation and NATCO GROUP INC.,
                                a Delaware corporation


                                By: /s/ PATRICK M. McCARTHY
                                   ------------------------------------------
                                Name:   Patrick M. McCarthy
                                     ----------------------------------------
                                Title:  President - Natco Group Inc.
                                      ---------------------------------------




                                       11




<PAGE>   1


                                                                   EXHIBIT 10.23






                               U.S. $3,000,000.00

                     INTERNATIONAL REVOLVING LOAN AGREEMENT

                                   DATED AS OF

                                  JUNE 30, 1997

                                 BY AND BETWEEN

                              NATIONAL TANK COMPANY

                                       AND

                    TEXAS COMMERCE BANK NATIONAL ASSOCIATION


<PAGE>   2


                                TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----

<S>                                                                                                               <C>
1.       CERTAIN DEFINITIONS......................................................................................1

2.       THE LOANS AND LETTERS OF CREDIT..........................................................................1
         2.1.        The Loans....................................................................................1
         2.2.        International Borrowing Base.................................................................2
         2.3.        Letters of Credit............................................................................3
         2.4.        Letter of Credit Requests....................................................................4
         2.5.        Agreement to Repay Letter of Credit Drawings.................................................4
         2.6.        Conflict between Applications and Agreement..................................................6
         2.7.        Increased Costs; Unavailable LIBOR; Increased Capital........................................6
         2.8.        Interest Rate Protection.....................................................................7
         2.9.        Voluntary Conversion/Continuation of Loans; Past Due Rate....................................7
         2.10.       Illegality, Etc..............................................................................8

3.       PREPAYMENTS AND OTHER PAYMENTS...........................................................................8
         3.1.        Required Prepayments.........................................................................8
         3.2.        Optional Prepayments.........................................................................8
         3.3.        Place of Payment or Prepayment...............................................................9
         3.4.        Prepayment Premium or Penalty................................................................9
         3.5.        Taxes........................................................................................9
         3.6.        Reduction or Termination of the Commitment...................................................9

4.       FEES.....................................................................................................9
         4.1.        Facility Fee.................................................................................9
         4.2.        Letter of Credit Fees.......................................................................10
         4.3.        Fees Not Interest; Nonpayment...............................................................10

5.       APPLICATION OF PROCEEDS.................................................................................10

6.       REPRESENTATIONS AND WARRANTIES..........................................................................10
         6.1.        Organization and Qualification..............................................................10
         6.2.        Financial Statements; Positive Tangible Net Worth...........................................10
         6.3.        Litigation..................................................................................11
         6.4.        Default.....................................................................................11
         6.5.        Title to Assets; Ownership..................................................................11
         6.6.        Authorization, Validity, Etc................................................................11
         6.7.        Line of Business............................................................................12
         6.8.        Taxes.......................................................................................12
         6.9.        Conflicting or Adverse Agreements or Restrictions...........................................12
         6.10.       Information.................................................................................12
         6.11.       No Consent..................................................................................12
         6.12.       Environmental Matters.......................................................................12
         6.13.       Debt........................................................................................13
</TABLE>

                                       -i-

<PAGE>   3


<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----

<S>                                                                                                              <C>

7.       CONDITIONS..............................................................................................13
         7.1.        Representations True and No Defaults........................................................13
         7.2.        Terms of Sale...............................................................................13
         7.3.        Governmental Approvals......................................................................14
         7.4.        Borrowing Documents.........................................................................14
         7.5.        Letter of Credit Documents..................................................................14
         7.6.        Required Initial Documents and Certificates.................................................14
         7.7.        Eximbank Acknowledgment, Etc................................................................15
         7.8.        Post-Closing Lien Search....................................................................16
         7.9.        Approval of Authorized Officer..............................................................16

8.       AFFIRMATIVE COVENANTS...................................................................................16
         8.1.        Financial Statements and Information........................................................16
         8.2.        Books and Records...........................................................................17
         8.3.        Insurance...................................................................................17
         8.4.        Inspection of Property and Records; Audits of Collateral....................................17
         8.5.        Notice of Certain Matters...................................................................18
         8.6.        Security and Further Assurances.............................................................18
         8.7.        Export Insurance............................................................................19
         8.8.        Maintenance of Property.....................................................................19
         8.9.        Existence, Laws and Obligations.............................................................19
         8.10.       Assignment of International Letter of Credit Proceeds.......................................19
         8.11.       Environmental Matters.......................................................................20
         8.12.       Controlling Affiliates......................................................................20

9.       NEGATIVE COVENANTS......................................................................................20
         9.1.        Liens.......................................................................................20
         9.2.        Merger, Consolidation, Etc..................................................................20
         9.3.        Nature of Business; Management..............................................................21
         9.4.        Loans and Investments.......................................................................21
         9.5.        Financial Covenants.........................................................................21
         9.6.        Debt........................................................................................21
         9.7.        Affiliate Transactions......................................................................22
         9.8.        Restricted Payments.........................................................................22
         9.9.        Change in Accounting Method.................................................................22
         9.10.       Export Orders and Indirect Export Orders....................................................22
         9.11.       Copyrights, Patents and Software............................................................22
         9.12.       Eximbank Violations.........................................................................22

10.      EVENTS OF DEFAULT; REMEDIES.............................................................................23
         10.1.       Failure to Pay Principal or Interest........................................................23
         10.2.       Failure to Pay Other Amounts................................................................23
         10.3.       Misrepresentation or Breach of Warranty.....................................................23
         10.4.       Violation of Covenants......................................................................23
         10.5.       Bankruptcy and Other Matters................................................................23
         10.6.       Dissolution.................................................................................24
</TABLE>

                                      -ii-

<PAGE>   4


<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----

<S>                                                                                                              <C>
         10.7.       Liens.......................................................................................24
         10.8.       Collateral..................................................................................24
         10.9.       International Security Documents............................................................24
         10.10.      Cross-Default to Export Orders, Indirect Export Orders and
                     Direct Export Contracts.....................................................................24
         10.11.      Cross-Default to Domestic Loan Documents....................................................24
         10.12.      Cross-Default to Non-Eximbank Debt..........................................................24
         10.13.      Cross-Acceleration to Other Debt............................................................24
         10.14.      Undischarged Judgment.......................................................................24
         10.15.      Cross-Default to Borrower Agreement.........................................................25
         10.16.      Change of Control...........................................................................25
         10.17.      Controlling Affiliates......................................................................25
         10.18.      Impairment of Eximbank Guaranty.............................................................25
         10.19.      Impairment of International Loan Documents, Export Orders,
                     Indirect Export Orders and Direct Export Contracts..........................................25
         10.20.      Negative Pledge on Shares...................................................................25
         10.21.      Other Remedies..............................................................................25
         10.22.      Collateral Account..........................................................................26
         10.23.      Remedies Cumulative.........................................................................26
         10.24.      Distributions in Violation of the Eximbank Guaranty.........................................26
         10.25.      Material Litigation.........................................................................26

11.      MISCELLANEOUS...........................................................................................26
         11.1.       Representation by the Bank..................................................................26
         11.2.       Waivers, Etc................................................................................26
         11.3.       Reimbursement of Expenses...................................................................27
         11.4.       Notices.....................................................................................27
         11.5.       Governing Law...............................................................................28
         11.6.       Survival of Representations, Warranties and Covenants.......................................28
         11.7.       Counterparts................................................................................28
         11.8.       Separability................................................................................28
         11.9.       Descriptive Headings........................................................................28
         11.10.      Accounting Terms............................................................................28
         11.11.      Limitation of Liability.....................................................................28
         11.12.      Set-off.....................................................................................29
         11.13.      Sale or Assignment..........................................................................29
         11.14.      Interest....................................................................................29
         11.15.      Indemnification.............................................................................30
         11.16.      Payments Set Aside..........................................................................30
         11.17.      Loan Agreement Controls.....................................................................31
         11.18.      FINAL AGREEMENT.............................................................................31
         11.19.      WAIVER OF JURY TRIAL........................................................................31
</TABLE>

                                      -iii-

<PAGE>   5


         Exhibit A   -     Definitions
         Exhibit B   -     Form of International Revolving Note
         Exhibit C   -     Form of Request for Borrowing
         Exhibit D   -     Form of International Borrowing Base Certificate,
                           together with Annex I and II
         Exhibit E   -     Form of Compliance Certificate
         Exhibit F   -     Form of Letter of Credit Request
         Exhibit G   -     Notice of Rate Change/Continuation

         Schedule 6.1   -     Subsidiaries
         Schedule 6.3   -     Litigation
         Schedule 6.5   -     Ownership
         Schedule 6.13  -     Existing Indebtedness
         Schedule 8.3   -     Insurance
         Schedule 9.1   -     Existing Liens

                                      -iv-

<PAGE>   6


                             INTERNATIONAL REVOLVING
                                 LOAN AGREEMENT


        NATIONAL TANK COMPANY, a Delaware corporation (hereinafter called the
"Borrower"), and TEXAS COMMERCE BANK NATIONAL ASSOCIATION, a national banking
association (together with its successors and assigns, hereinafter called the
"Bank"), hereby agree as follows:

     1. CERTAIN DEFINITIONS. Capitalized terms used in this Agreement and not
otherwise defined herein shall have the meanings given to them in Exhibit A to
this Agreement.

     2. THE LOANS AND LETTERS OF CREDIT.

        2.1. THE LOANS.

        (a) Upon the terms and conditions and relying upon the representations
     and warranties herein set forth, the Bank agrees to make Loans to the
     Borrower on any one or more Business Days prior to the Maturity Date, up to
     an aggregate principal amount of Loans not exceeding at any one time
     outstanding the lesser of (i) $3,000,000.00 (such amount, as it may be
     reduced from time to time pursuant to Section 3.6, being the Bank's
     "Commitment") or (ii) the International Borrowing Base. Subject to the
     terms and conditions of this Agreement, the Borrower may borrow, repay and
     reborrow hereunder.

        (b) The Borrower shall execute and deliver to the Bank to evidence the
     Loans made by the Bank under the Bank's Commitment, a Note which shall be
     (i) dated of even date herewith; (ii) in the principal amount of the
     Commitment; and (iii) in substantially the form attached hereto as Exhibit
     B, with the blanks appropriately filled. The outstanding principal balance
     of the Note shall be payable on or before the Maturity Date. The Note shall
     bear interest on the unpaid principal amount thereof from time to time
     outstanding, payable on the last Business Day of each month, commencing on
     July 31, 1997, and at maturity, at a rate per annum (calculated based on a
     year of 360 days) which (A) in the case of a Base Rate Loan shall be equal
     to the lesser of (i) the Base Rate, such interest rate to change
     automatically from time to time effective as of the date of each change in
     the Base Rate, or (ii) the Highest Lawful Rate, and (B) in the case of a
     LIBOR Rate Loan shall be equal to the lesser of (i) the LIBOR Rate plus
     2.25%, such interest rate to change automatically from time to time
     effective as of the date of each change in the LIBOR Rate, or (ii) the
     Highest Lawful Rate. Any amount of principal which is not paid when due
     (whether at stated maturity, by acceleration or otherwise) shall bear
     interest at the Past Due Rate.

        (c) Each Loan (other than a Loan made pursuant to Section 2.5(a) to
     repay a reimbursement obligation) made hereunder shall be in $100,000
     increments and in a

                                       -1-
<PAGE>   7


     principal amount of not less than $500,000 or the balance of the
     Commitment, if such balance is less than $500,000, and shall be made on
     prior written notice from the Borrower to the Bank in the form of Exhibit C
     attached hereto (the "Request for Borrowing") delivered to the Bank not
     later than 12:00 noon (Houston time) (i) in the case of a LIBOR Rate Loan
     on the third Business Day prior to the date of the proposed Loan (the
     "Borrowing Date"), and (ii) in the case of a Base Rate Loan at least one
     Business Day prior to the proposed Borrowing Date. Each Request for
     Borrowing shall specify (i) the amount of the proposed borrowing and of
     each Loan comprising a part thereof; (ii) the Borrowing Date; (iii) the
     Type of Loan requested; (iv) with respect to any LIBOR Rate Loan, the
     Interest Period with respect to each such Loan and the Expiration Date of
     each such Interest Period (provided, that there shall not be more than
     three (3) Interest Periods in effect at any one time under this Agreement).
     The Borrower may give the Bank telephonic notice, including by telephonic
     facsimile, by the required time of any proposed borrowing under this
     Section 2.1(c); provided, however, that such telephonic notice shall be
     confirmed in original writing by delivery to the Bank promptly (but in no
     event later than the Borrowing Date relating to any such borrowing) of a
     Request for Borrowing. The Bank shall not incur any liability to the
     Borrower in acting upon any telephonic notice referred to above which the
     Bank believes to have been given by the Borrower, or for otherwise acting
     in good faith under this Section 2.1(c). Upon fulfillment of the applicable
     conditions set forth in Section 7, on the Borrowing Date, the Bank shall
     make the borrowing available to the Borrower. The Bank shall pay or deliver
     the proceeds of each borrowing to or upon the order of the Borrower;
     provided that in the case of the first Loan, such payment or delivery shall
     be made only against delivery to the Bank of the Note payable to the order
     of the Bank. The Bank's records as to the date and principal amount of each
     Loan and each payment of principal thereon shall be controlling. Any
     deposit to or for the Borrower's account by the Bank pursuant to a request
     (whether written or oral) believed by the Bank to be an authorized request
     by the Borrower for a Loan hereunder shall be deemed to be a Loan hereunder
     for all purposes with the same effect as if the Borrower had in fact
     requested the Bank to make such Loan.

        (d) Each Request for Borrowing shall be irrevocable and binding on the
     Borrower. In the case of any request for a LIBOR Rate Loan, the Borrower
     shall indemnify the Bank against any loss, cost or expense incurred by the
     Bank as a result of any failure to fulfill on or before the Borrowing Date
     specified in such Request for Borrowing for such Loan the applicable
     conditions set forth in Section 7, including, without limitation, any loss
     (including loss of anticipated profits), cost or expense incurred by reason
     of the liquidation or reemployment of deposits or other funds acquired by
     the Bank to fund the Loan when the Loan, as a result of such failure, is
     not made on such date.

        2.2. INTERNATIONAL BORROWING BASE.

        (a) From the date hereof to the date of the first determination of the
International Borrowing Base as hereinafter provided, the amount of the
International Borrowing Base shall be $0.

                                       -2-
<PAGE>   8


        (b) As soon as available, and in any event within twenty (20) Business
Days after the end of each calendar month, the Borrower shall furnish the Bank
an international borrowing base detailed scheduled report (the "International
Borrowing Base Certificate") in the form of Exhibit D, which is dated as of the
end of each calendar month and which includes a list of the Eligible Accounts
Receivable and Eligible Inventory of the Borrower as at the end of the preceding
month, such list to be in such form and containing such information and detail
as the Bank may reasonably request, and as is satisfactory to the Bank, to
comply with the requirements of the Eximbank Guaranty, including, without
limiting the generality of the foregoing, as to Eligible Accounts Receivable,
aging thereof in the customary manner. The inclusion of any receivable or
inventory in the International Borrowing Base Certificate shall constitute a
representation and warranty by the Borrower that such receivable is an Eligible
Accounts Receivable or Eligible Inventory, as the case may be. The Bank may, on
demand, inspect the documentation supporting any International Borrowing Base
Certificate.

        (c) Two (2) Business Days after the receipt of any such International
Borrowing Base Certificate (unless the Bank prior to such date has notified the
Borrower of its determination of a different International Borrowing Base) the
International Borrowing Base amount stated in any such International Borrowing
Base Certificate shall automatically be deemed the International Borrowing Base
amount until the earlier of (i) the date of the next determination or (ii) the
date the Bank notifies the Borrower of its determination of a different
International Borrowing Base. The date of any such notification (if any) by the
Bank is herein called a "Determination Date" and any increase or reduction in
the International Borrowing Base by the Bank shall be effective as of such date.
Each determination of the International Borrowing Base shall be made by the Bank
in its reasonable business judgment, based on the most recent International
Borrowing Base Certificate furnished by the Borrower and other information
available to the Bank.

        2.3. LETTERS OF CREDIT.

        (a) Subject to and upon the terms and conditions herein set forth,
including, without limitation, the applicable terms and conditions set forth in
Section 7 hereof, the Bank agrees that it will, following its receipt of a
Letter of Credit Request, issue for the account of the Borrower and in support
of the obligations of the Borrower, one or more irrevocable letters of credit
which either (i) can be drawn down by a Buyer only if the Borrower fails to
perform all of its obligations under an Export Order or Indirect Export Order,
or (ii) can be drawn down by a United States supplier if the Borrower fails to
pay for goods or services purchased from said supplier by the Borrower in
support of export sales to be made pursuant to an Export Order or Indirect
Export Order (all such letters of credit collectively, the "Letters of Credit");
provided that the Bank shall be under no obligation to issue any Letter of
Credit if at the time of such issuance:

        (i) any order, judgment or decree of any Governmental Authority or
     arbitrator shall purport by its terms to enjoin or restrain the Bank from
     issuing such Letter of Credit or any requirement of law applicable to the
     Bank or any request or directive (whether or not having the force of law)
     from any Governmental Authority with jurisdiction over the Bank shall
     prohibit, or request that the Bank refrain from, the issuance of letters of
     credit generally; or


                                       -3-
<PAGE>   9


        (ii) the Stated Amount of such Letter of Credit plus the Letter of
     Credit Outstandings at such time (subject to any adjustment pursuant to
     Section 2.3(c), if any) and the aggregate principal amount of all Loans
     then outstanding (after giving effect to the principal amount of all Loans
     repaid and all Unpaid Drawings reimbursed prior to or concurrently with the
     issuance of such Letter of Credit) exceeds the lesser of (A) the Commitment
     (after giving effect to any reductions to the Commitment on such date) and
     (B) the International Borrowing Base then in effect; or

        (iii) unless the Bank shall give its prior written consent in its sole
     discretion, the expiry date, or, in the case of any Letter of Credit
     containing an expiry date that is extendible at the option of the Bank, the
     initial expiry date of such Letter of Credit, is a date that is later than
     the scheduled Maturity Date; or

        (iv) the expiry date is not later than twelve (12) months from the date
     of issuance of such letter of credit.

        (b) Notwithstanding the foregoing, the Bank may not issue during the
final sixty (60) days of the term of this Agreement any Letters of Credit which
expire after the Maturity Date unless the Bank either has decided to renew this
Agreement or has obtained the prior written approval of Eximbank.

        (c) The Bank may from time to time, in its sole and absolute discretion,
allow the issuance of Letters of Credit that are less than 100% collateralized.

        2.4. LETTER OF CREDIT REQUESTS.

        (a) Whenever the Borrower desires that a Letter of Credit be issued for
its account or that an existing expiry date shall be extended, it shall deliver
to the Bank its prior written request therefore not later than 12:00 noon
(Houston time) on at least the second (2nd) Business Day prior to the requested
issuance or extension date, as the case may be. Each such request shall be
executed by the Borrower and shall be in the form of Exhibit F attached hereto
(each a "Letter of Credit Request") and, in the case of the issuance of any
Letter of Credit, shall be accompanied by an Application therefor, completed to
the satisfaction of the Bank, and such other certificates, documents and other
papers and information as the Bank may reasonably request. Each Letter of Credit
shall be denominated in Dollars, shall expire no later than the date specified
in Section 2.3, shall not be in an amount greater than is permitted under
Section 2.3(a) and shall be in such form as may be approved from time to time by
the Bank and the Borrower.

        (b) The making of each Letter of Credit Request shall be deemed to be a
representation and warranty by the Borrower that such Letter of Credit may be
issued in accordance with, and will not violate the requirements of Section
2.3(a) and Section 7 of this Agreement. Upon its issuance of any Letter of
Credit or the extension of the existing expiry date of any Letter of Credit, as
the case may be, the Bank shall promptly notify the Borrower of such issuance or
extension, which notice shall be accompanied by a copy of the Letter of Credit
actually issued or a copy of any amendment extending the existing expiry date of
any Letter of Credit, as the case may be.

                                       -4-
<PAGE>   10


        2.5. AGREEMENT TO REPAY LETTER OF CREDIT DRAWINGS.

        (a) Upon the receipt by the Bank of any Drawing from a beneficiary under
a Letter of Credit, the Bank promptly will provide the Borrower with telecopy
notice thereof. The Borrower hereby agrees to reimburse the Bank by making
payment to the Bank in immediately available funds at the office, for any
payment made by the Bank under any Letter of Credit issued by it (each such
amount so paid until reimbursed, an "Unpaid Drawing") immediately after, and in
any event on the date of, such payment, with interest on the amount so paid by
the Bank, to the extent not reimbursed prior to 2:00 p.m. (Houston time) on the
date of such payment, from and including the date paid but excluding the date
reimbursement is made as provided above, at a rate per annum equal to the
Highest Lawful Rate, such interest to be payable on demand. Unless otherwise
paid by the Borrower, such Unpaid Drawing may (and, if the Bank so desires,
shall automatically, provided that the Bank give notice thereof to Borrower
promptly thereafter), subject to satisfaction of the conditions precedent set
forth in Sections 2.3 and 7, be paid with the proceeds of Loans which shall bear
interest at an annual rate equal to the Base Rate.

        (b) The Borrower's obligations under this Section 2.5 to reimburse the
Bank with respect to Unpaid Drawings (including, in each case, interest thereon)
shall be absolute and unconditional under any and all circumstances (except as
provided below with respect to the gross negligence or willful misconduct of the
Bank) and irrespective of any setoff, counterclaim or defense to payment which
the Borrower may have or have had against the Bank, including any defense based
upon the failure of any drawing under a Letter of Credit (each a "Drawing") to
conform to the terms of the Letter of Credit (other than a defense based upon
the gross negligence or willful misconduct of the Bank in determining whether
such Drawing conforms to the terms of the Letter of Credit) or any
non-application or misapplication by the beneficiary of the proceeds of such
Drawing, including any of the following circumstances:

         (i) any lack of validity or enforceability of this Agreement or any of
    the other International Loan Documents;

         (ii) the existence of any claim, setoff, defense or other right which
    the Borrower may have at any time against a beneficiary named in a Letter of
    Credit, any transferee of any Letter of Credit (or any Person for whom any
    such transferee may be acting), the Bank, or any other Person, whether in
    connection with this Agreement, any Letter of Credit, the transactions
    contemplated herein or any unrelated transactions (including any underlying
    transaction between the Borrower or any other Person and the beneficiary
    named in any such Letter of Credit);

         (iii) any draft, certificate or any other document presented under the
    Letter of Credit proving to be forged, fraudulent, invalid or insufficient
    in any respect or any statement therein being untrue or inaccurate in any
    respect;

         (iv) the surrender or impairment of any security for the performance or
    observance of any of the terms of any of the International Loan Documents;

         (v) the occurrence of any Default or Event of Default; or


                                       -5-
<PAGE>   11


        (vi) any other circumstance which might otherwise constitute a
defense available to, or a discharge of, the Borrower;

provided that none of the foregoing is attributable to the gross negligence or
willful misconduct of the Bank.

        (c)  The Borrower also agrees with the Bank that, in the absence of
gross negligence or willful misconduct of the Bank, the Bank shall not be
responsible for, and the Borrower's reimbursement obligations under Section
2.6(a) shall not be affected by, among other things, the validity or genuineness
of documents or of any endorsements thereon, even though such documents shall in
fact prove to be invalid, fraudulent or forged or any dispute between or among
the Borrower or any other Person and the beneficiary of any Letter of Credit or
any other party to which such Letter of Credit may be transferred or any claims
whatsoever of the Borrower or any other Person against any beneficiary of such
Letter of Credit or any such transferee.

        (d)  The Bank shall not be liable for any error, omission, interruption
or delay in transmission, dispatch or delivery of any message or advice, however
transmitted, in connection with any Letter of Credit, except for errors or
omissions caused by the Bank's gross negligence or willful misconduct. The
Borrower agrees that any action taken or omitted by the Bank under or in
connection with any Letter of Credit or the related drafts or documents, if done
in the absence of gross negligence or willful misconduct and in accordance with
the standards of care specified in the Uniform Customs and Practice for
Documentary Credits (1994 Revision), International Chamber of Commerce,
Publication No. 500 (and any subsequent revisions thereof approved by a Congress
of the International Chamber of Commerce and adhered to by such Bank) and, to
the extent not inconsistent therewith, the Uniform Commercial Code of the State
of Texas, shall not result in any liability of the Bank to the Borrower or any
other Person. IT IS THE INTENT OF THE PARTIES HERETO THAT THE BANK SHALL NOT
HAVE ANY LIABILITY UNDER THIS SECTION 2.5 FOR THE ORDINARY SOLE OR CONTRIBUTORY
NEGLIGENCE OF THE BANK.

        2.6. CONFLICT BETWEEN APPLICATIONS AND AGREEMENT. To the extent that any
provision of any Application related to any Letter of Credit is inconsistent
with the provisions of this Agreement, the provisions of this Agreement shall
control.

        2.7. INCREASED COSTS; UNAVAILABLE LIBOR; INCREASED CAPITAL.

        (a)  If, due to either (i) the introduction of or any change in or in
the interpretation of any law or regulation or (ii) the compliance with any
guideline or request from any central bank or other Governmental Authority
(whether or not having the force of law), there shall be any increase in the
cost to the Bank of agreeing to make or making, funding or maintaining LIBOR
Rate Loans, then the Borrower shall from time to time, upon demand by the Bank,
pay to the Bank additional amounts sufficient to compensate the Bank for such
increased cost. A certificate as to the amount of such increased cost, submitted
to the Borrower by the Bank, shall be conclusive and binding for all purposes,
absent manifest error.

        (b)  If the Borrower shall have chosen the LIBOR Rate in a Request for
Borrowing or a Notice of Rate Change/Continuation and not later than 11:00 a.m.
(Houston, Texas time) one


                                       -6-
<PAGE>   12


Business Day prior to the Borrowing Date or Conversion/Continuation Date, as the
case may be, the Bank notifies the Borrower that (i) deposits in Dollars in the
principal amount of such LIBOR Rate Loan are not being offered to the Bank in
the interbank market selected by the Bank for the Interest Period applicable
thereto or (ii) adequate and reasonable means do not exist for ascertaining the
chosen LIBOR Rate in respect of such LIBOR Rate Loan or (iii) the LIBOR Rate for
any Interest Period for such LIBOR Rate Loan will not adequately reflect the
cost to the Bank of making such LIBOR Rate Loan for such Interest Period, then
such LIBOR Rate shall not become effective as to such LIBOR Rate Loan on such
Borrowing Date or the Conversion/Continuation Date, as the case may be, or at
any time thereafter until such time thereafter as the Borrower receives notice
from the Bank that the circumstances giving rise to such determination no longer
apply and such Loan shall bear interest at the lesser of (i) the Base Rate or
(ii) the Highest Lawful Rate.

        (c) If the Bank determines that compliance with any law or regulation or
any guideline or request from any central bank or other Governmental Authority
(whether or not having the force of law) affects or would affect the amount of
capital required or expected to be maintained by the Bank or any corporation
controlling the Bank and that the amount of such capital is increased by or
based upon the existence of the Bank's Commitment hereunder and other
commitments of this type, then, within fifteen (15) Business Days after demand
by the Bank, the Borrower shall pay to the Bank, from time to time as specified
by the Bank, additional amounts sufficient to compensate the Bank or such
corporation in the light of such circumstances. A certificate as to such amounts
submitted to the Borrower by the Bank shall be conclusive and binding for all
purposes, absent manifest error.

        (d) Anything in this Section notwithstanding: (i) the Borrower shall not
be required to pay to the Bank reimbursement or indemnification with regard to
any costs or expenses described in this Section, unless the Bank notifies the
Borrower of such costs or expenses within 90 days after the date paid or
incurred; and (ii) the Bank shall not be permitted to pass through to the
Borrower charges and costs under this Section on a discriminatory basis (i.e.,
which are not also passed through by the Bank to other customers of the Bank
similarly situated where such customer is subject to documents providing for
such pass through).

        2.8. INTEREST RATE PROTECTION. If the Borrower shall fail to select the
duration of any Interest Period for any LIBOR Rate Loan in accordance with the
provisions hereof, such Loan will automatically, on the last day of the then
existing Interest Period therefor, convert into a Base Rate Loan.

        2.9. VOLUNTARY CONVERSION/CONTINUATION OF LOANS; PAST DUE RATE.

        (a) So long as no Default or Event of Default has occurred and is
continuing, the Borrower may (i) change the interest rates to apply to any Loan
or (ii) elect to continue all or any part of the outstanding principal balance
of any LIBOR Rate Loan as an Loan of such Type by giving the Bank an irrevocable
written notice (the "Notice of Rate Change/Continuation") in the form of Exhibit
G hereto, specifying (A) the date on which such Loan was made; (B) the interest
rate then applicable to such Loan; (C) with respect to any LIBOR Rate Loan, the
Interest Period then applicable to each such Loan; (D) the principal amount of
such Loan to remain outstanding; (E) the Type of Loan and, with respect to any
LIBOR Rate Loan, the Interest Period to become applicable


                                       -7-
<PAGE>   13


to such Loan on the effective date of the rate change or continuation; and (F)
the requested effective date of the rate change or continuation (the
"Conversion/Continuation Date"). In the case of the conversion of all or any
part of any Base Rate Loan into a LIBOR Rate Loan or the continuation of any
LIBOR Rate Loan as an Loan of such Type, such notice must be received by the
Bank not later than 11:00 A.M. (Houston time) at least three (3) full Business
Days prior to the Conversion/Continuation Date, and otherwise at least one (1)
full Business Day prior thereto. Each rate so specified shall become effective
on the Conversion/Continuation Date and remain in effect until the expiration of
the applicable Interest Period specified in such Notice of Rate
Change/Continuation.

        (b) Nothing contained herein shall authorize the Borrower (i) to convert
any Loan into or continue any Loan as a LIBOR Rate Loan unless the Expiration
Date of the Interest Period for such Loan occurs on or before the Maturity Date
or (ii) to continue or change the interest rates applicable to any LIBOR Rate
Loan prior to the Expiration Date of the Interest Period with respect thereto.

        (c) Notwithstanding anything set forth herein to the contrary, any Loan
which is not paid when due shall bear interest at a rate per annum which shall
be equal to the lesser of (i) 3% above the interest rate otherwise applicable
thereto or (ii) the Highest Lawful Rate, which interest shall be due and payable
on demand.

        2.10. ILLEGALITY, ETC. Notwithstanding any other provision of this
Agreement, if the Bank shall notify the Borrower that the introduction of or any
change in or in the interpretation of any law or regulation makes it unlawful,
or any central bank or other Governmental Authority asserts that it is unlawful,
for the Bank to perform its obligations hereunder to make LIBOR Rate Loans or to
fund or maintain LIBOR Rate Loans hereunder, (i) the obligation of the Bank to
make, or to convert Loans into, LIBOR Rate Loans shall be suspended until the
Bank shall notify the Borrower that the circumstances causing such suspension no
longer exist and (ii) the Borrower shall forthwith prepay in full all LIBOR Rate
Loans of the Bank then outstanding, together with interest accrued thereon,
unless the Borrower, within five (5) Business Days of notice from the Bank,
converts all LIBOR Rate Loans of the Bank then outstanding into a Base Rate
Loan.

     3. PREPAYMENTS AND OTHER PAYMENTS.

        3.1. REQUIRED PREPAYMENTS.

        (a) The Borrower agrees that if at any time it or the Bank determines
that the aggregate principal amount of Loans outstanding plus the Letter of
Credit Outstandings (subject to any adjustment pursuant to Section 2.3(c), if
any) exceeds the International Borrowing Base, the Borrower will, within five
(5) Business Days, either (i) make a prepayment of principal in an amount at
least equal to such excess, or (ii) furnish additional security to the Bank, in
form and amount satisfactory to the Bank and the Eximbank.

        (b) The Borrower agrees that if at any time the aggregate principal
amount of Loans outstanding plus the Letter of Credit Outstandings exceeds the
amount of the Commitment, the Borrower shall immediately make a prepayment of
principal in an amount at least equal to such excess.


                                       -8-
<PAGE>   14


        3.2. OPTIONAL PREPAYMENTS. The Borrower shall have the right at any time
and from time to time to prepay the Note, in whole or in part, provided that
each partial prepayment shall be in an aggregate principal amount of at least
$50,000 or such lesser amount as may be due and owing. In the event of such
prepayment of a LIBOR Rate Loan, the Borrower shall be obligated to reimburse
the Bank in respect thereof pursuant to Section 3.4.

        3.3. PLACE OF PAYMENT OR PREPAYMENT. All payments and prepayments of the
International Obligations made in accordance with the provisions of this
Agreement or of the Note, including, without limitation, fees, principal or
interest, shall be made to the Bank no later than 2:00 p.m. (Houston time) on
the date when due, in immediately available funds.

        3.4. PREPAYMENT PREMIUM OR PENALTY. Each prepayment pursuant to Section
3.1 or 3.2 shall be without premium or penalty, provided, if any payment of
principal of any LIBOR Rate Loan is made other than on the last day of the
Interest Period for such Loan, as a result of a payment pursuant to Sections 3.1
or 3.2 or acceleration of the maturity of the Loans and the Notes pursuant to
Section 10 or for any other reason, the Borrower shall, within 15 Business Days
after receipt of Bank's demand, pay to the Bank any amounts required to
compensate the Bank for additional losses, costs or expenses which it may
reasonably incur as a result of such payment, including, without limitation, any
loss (including loss of anticipated profits), cost or expense incurred by reason
of the liquidation or reemployment of deposits or other funds acquired by the
Bank to fund or maintain such Loan.

        3.5. TAXES. All payments (whether of principal, interest, reimbursements
or otherwise) under this Agreement or on the Note shall be made by the Borrower
without set-off or counterclaim and shall be made free and clear of and without
deduction for any present or future tax, levy, impost or any other charge, if
any, of any nature whatsoever now or hereafter imposed by any taxing authority,
but excluding taxes imposed on or measured by the Bank's net income and
franchise taxes imposed on the Bank. If the making of such payments is
prohibited by law unless such a tax, levy, impost or other charge is deducted or
withheld therefrom, the Borrower shall pay to the Bank, on the date of each such
payment, such additional amounts as may be necessary in order that the net
amounts received by the Bank after such deduction or withholding shall equal the
amounts which would have been received if such deduction or withholding were not
required.

        3.6. REDUCTION OR TERMINATION OF THE COMMITMENT. The Borrower may at any
time or from time to time reduce or terminate the Commitment by giving written
notice thereof no later than 2:00 p.m. (Houston time) not less than two (2)
Business Days' prior to such reduction or termination. Any reduction in the
Commitment shall be effective on the date specified in the Borrower's notice
with respect to such reduction. The Commitment shall automatically terminate on
the Maturity Date or in the event of acceleration of the Maturity Date of the
Note. Each reduction of the Commitment hereunder shall be irrevocable.

     4. FEES.

        4.1. FACILITY FEE. The Borrower hereby irrevocably agrees to pay $30,000
to the Bank on the Closing Date. In no event shall such amount be refunded to
the Borrower, whether or


                                       -9-
<PAGE>   15


not the transactions contemplated hereby are consummated. The required facility
fee hereunder is 1.0% of the Commitment.

        4.2. LETTER OF CREDIT FEES. The Borrower agrees to pay the Bank a fee in
respect of each Letter of Credit issued for the account of the Borrower (the
"Letter of Credit Fee"), computed at the rate of 1% per annum on the initial
Stated Amount of such Letter of Credit. Letter of Credit Fees shall be due and
payable quarterly, in advance. Fees due under this Section 4.2 shall be computed
on the basis of a year of 360 days.

        4.3. FEES NOT INTEREST; NONPAYMENT. The fees described in this Agreement
represent compensation for services rendered and to be rendered separate and
apart from the lending of money or the provision of credit and do not constitute
compensation for the use, detention or forbearance of money, and the obligation
of the Borrower to pay each fee described herein shall be in addition to, and
not in lieu of, the obligation of the Borrower to pay interest, other fees
described in this Agreement, and expenses otherwise described in this Agreement.
Fees shall be payable when due in Dollars and in immediately available funds.
All fees shall be non-refundable, and shall, to the fullest extent permitted by
law, bear interest, if not paid when due, at a rate per annum equal to the Past
Due Rate.

     5. APPLICATION OF PROCEEDS. The Borrower agrees that (a) the proceeds of
the Loans shall be used exclusively for purposes permitted pursuant to the
Eximbank Guaranty and the Borrower Agreement and (b) the Letters of Credit shall
be issued solely to support the Borrower's obligations (i) under an Export Order
or Indirect Export Order, or (ii) to pay for goods or services purchased from a
United States supplier in support of export sales to be made, pursuant to an
Export Order or Indirect Export Order.

     6. REPRESENTATIONS AND WARRANTIES. The Borrower represents and warrants
that:

        6.1. ORGANIZATION AND QUALIFICATION. The Borrower and each Subsidiary
(a) is duly organized, validly existing, and in good standing under the laws of
its state of formation; (b) has the power to own its Properties and to carry on
its business as now conducted; and (c) is duly qualified to do business and is
in good standing in every jurisdiction where such qualification is necessary.
The Borrower has no Subsidiaries other than those listed on Schedule 6.1.

        6.2. FINANCIAL STATEMENTS; POSITIVE TANGIBLE NET WORTH. The Borrower and
each Guarantor has furnished the Bank with the following financial statements:
(a) its year-end Annual Audited Financial Statements for the fiscal periods
ended 1994, 1995 and 1996; and (b) its balance sheet and statement of operations
and retained earnings as at and for the 12 month period ended March 31, 1997.
These statements have been prepared in conformity with GAAP. Such statements
present, in all material respects, the financial condition of the Borrower or
Guarantor and its Subsidiaries and the results of its operations as at the dates
and for the periods indicated. There has been no material adverse change in the
condition, financial or otherwise, of the Borrower since March 31, 1997. During
the period from March 31, 1997 to the Closing Date, the Borrower has had a
positive tangible net worth, as determined in accordance with GAAP. For the
purpose of this determination, net worth (as determined in accordance with GAAP)
must be (i) increased by any


                                      -10-
<PAGE>   16


Indebtedness of the Borrower and its Subsidiaries subordinated to the Loans and
(ii) decreased by all intangible assets (including, without limitation, all
patents, licenses, goodwill, subscription lists, capitalized software,
organization expenses, covenants not to compete, and investments in and monies
due from Affiliates, officers and directors of the Borrower and its
Subsidiaries).

        6.3. LITIGATION. Other than as set forth on Schedule 6.3, there is no
material action or proceeding pending or, to the knowledge of the Borrower,
threatened against or involving the Borrower or any Subsidiary thereof before
any court, administrative agency or arbitrator which, if adversely determined,
could reasonably be expected to have a Material Adverse Effect. There is no
outstanding judgment, order or decree binding upon the Borrower or any
Subsidiary before or by any administrative or governmental authority.

        6.4. DEFAULT. Neither the Borrower nor any Subsidiary is in default
under or in violation of the provisions of (i) any instrument evidencing any
Indebtedness or (ii) any agreement relating thereto or (iii) any Governmental
Requirement (except where such default or violation could not reasonably be
likely to have a Material Adverse Effect) or (iv) any Export Order or Indirect
Export Order (which is a material violation of such Export Order or Indirect
Export Order), which has not been waived by the applicable lender or other party
thereto.

        6.5. TITLE TO ASSETS; OWNERSHIP. (a) The Borrower and each Subsidiary
has good and marketable title to its material Properties, subject to no Liens
except as permitted by Section 9.1 hereof.

        (b) The Persons identified on Schedule 6.5 directly own, free and clear
of all Liens or restrictions on transferability or voting, one hundred percent
(100%) of the outstanding shares of the Borrower and all such shares are validly
issued, fully paid and non-assessable. There are no outstanding warrants,
options, contracts or commitments of any kind entitling any Person to purchase
or otherwise acquire (i) any shares of the capital stock (or other equivalent
interests) of the Borrower or (ii) any securities convertible into or
exchangeable for any shares (or other equivalent interests) of such capital
stock (or other equivalent interests). No securities are outstanding which are
convertible into or exchangeable for any shares of capital stock (or other
equivalent interests) of the Borrower. The Persons identified on Schedule 6.5 as
Controlling Affiliates are the only Controlling Affiliates of the Borrower.

        6.6. AUTHORIZATION, VALIDITY, ETC. The Borrower has the power and
authority to make, execute, deliver and carry out the International Loan
Documents to which it is a party and the transactions contemplated therein and
to perform its obligations thereunder and all such action has been duly
authorized by all necessary proceedings on its part. The International Loan
Documents have been duly and validly executed and delivered by the Borrower and
the Guarantors and constitute valid and legally binding agreements of the
Borrower and the Guarantors enforceable in accordance with their respective
terms, except as limited by Debtor Laws. The Liens created by the International
Security Documents will constitute valid and perfected Liens on the
International Collateral described therein subject in priority to no other Liens
whatsoever. The liens created by the International Security Documents will
constitute valid and perfected Liens on the Domestic Collateral, subject in
priority to no other Liens whatsoever, other than Permitted Liens and Liens
securing the Domestic Obligations.


                                      -11-
<PAGE>   17


        6.7. LINE OF BUSINESS. The Borrower's line of business is to design,
distribute, install and service production processing equipment and systems for
the petroleum industry worldwide. The Borrower provides a wide spectrum of
equipment and systems for separating one substance from another in a hydrocarbon
fluid stream and removing contaminants from gases and liquids.

        6.8. TAXES. (a) The Borrower and each Subsidiary has filed, or has
caused to be filed, all tax returns required to be filed and has paid, or has
caused to be paid, all taxes shown on said returns and all assessments which are
not yet delinquent. The Borrower is not aware of any pending investigation by
any taxing authority or of any claims by any Governmental Authority for any
unpaid taxes, except liabilities contested in good faith.

        (b) The Borrower and each Guarantor has furnished the Bank a copy of its
signed federal tax returns, including federal income tax returns, for the years
1994, 1995 and 1996.

        6.9. CONFLICTING OR ADVERSE AGREEMENTS OR RESTRICTIONS. Neither the
execution, delivery and performance of the International Loan Documents to which
the Borrower or any Subsidiary is a party, any Export Order, or any Indirect
Export Order, nor the consummation of the transactions contemplated thereby nor
fulfillment of and compliance with the respective terms, conditions and
provisions thereof, will conflict with or result in a breach of any of the
terms, conditions or provisions of, or constitute a default under, or result in
any violation of, or result in the creation or imposition of any Lien on any of
the Property of the Borrower or any Subsidiary or Guarantor pursuant to, (a) the
charter or bylaws of such Person; (b) any Governmental Requirement; or (c) the
terms, conditions or provisions of any material contract to which such Person is
a party or by which it is bound or to which it is subject.

        6.10. INFORMATION. Neither this Agreement nor any other document,
certificate or statement furnished to the Bank by or on behalf of the Borrower
or any Subsidiary or Guarantor in connection with this Agreement (including,
without limitation, any Export Order or any International Borrowing Base
Certificate) contains any statement of fact which is untrue or incorrect in any
material respect or omits to state a fact necessary in order to make the
statements contained herein and therein not misleading. There is no fact
peculiar to the Borrower which currently or (so far as the Borrower can now
reasonably foresee) in the future may result in the existence of a Material
Adverse Effect.

        6.11. NO CONSENT. Except to the extent obtained, no authorization or
approval or other action by, and no notice to or filing with, any Person or any
Governmental Authority is required for the due execution, delivery, and
performance (a) by the Borrower or any Subsidiary or Guarantor of any
International Loan Document to which it is a party or the borrowings hereunder,
in each case as contemplated herein, or the effectuation of the transactions
contemplated under any International Loan Document to which it is a party, or
(b) of any Export Order or any Indirect Export Order by the parties thereto or
the effectuation of the transactions contemplated thereunder.

        6.12. ENVIRONMENTAL MATTERS. The Borrower and each Subsidiary (a) owns,
possesses or otherwise holds, and is in compliance with the terms and conditions
of, all Governmental Approvals under Environmental Laws necessary for the
ownership or lease and


                                      -12-
<PAGE>   18


operation of its Property and the carrying on of its business as now conducted
or proposed to be conducted and except where the failure would not reasonably be
expected to have a Material Adverse Effect, and (b) is in compliance with all
Governmental Requirements relating to the environment except where the failure
would not reasonably be expected to have a Material Adverse Effect. There are no
civil, criminal or administrative actions, investigations or proceedings or
claims pending or, to the best knowledge of the Borrower, threatened against the
Borrower or any Subsidiary, for noncompliance with Environmental Laws or arising
out of the presence or release of hazardous materials at, on or under any
Property now owned, leased or operated by the Borrower or any Subsidiary which,
if adversely determined, could reasonably be expected to have a Material Adverse
Effect.

        6.13. DEBT. Attached hereto as Schedule 6.13 is a complete list, as of
the Closing Date, of all agreements or instruments evidencing Indebtedness of
the Borrower, each Subsidiary and the Guarantors not reflected in the Annual
Audited Financial Statements previously furnished to the Bank pursuant to
Section 6.2 (other than the International Loan Documents, the Domestic Loan
Documents and agreements or instruments evidencing Indebtedness arising from or
with respect to current accounts payable and unsecured current liabilities, not
the result of borrowing, to vendors, suppliers and Persons providing services,
for expenditures and/or goods and services normally required by it in the
ordinary course of business and on ordinary trade terms).

        6.14. NO UNTRUE OR MISLEADING STATEMENTS. No document, instrument or
other writing furnished to the Bank by or on behalf of the Borrower, any
Subsidiary or Guarantor in connection with the transactions contemplated by the
International Loan Documents contains any untrue material statement of fact or
omits to state any such fact necessary to make the representations, warranties
and other statements contained herein or in such other document, instrument or
writing not misleading in any material respect.

     7. CONDITIONS. The obligation of the Bank to make each Loan, to issue each
Letter of Credit, is subject to the following conditions:

        7.1. REPRESENTATIONS TRUE AND NO DEFAULTS. (a) The representations and
warranties of the Borrower contained in the International Loan Documents shall
be true and correct on and as of the particular Borrowing Date or the date of
the issuance of any Letter of Credit, as the case may be, as though made on and
as of such date unless otherwise limited to an earlier date; (b) no event which
could reasonably be expected to have a Material Adverse Effect shall have
occurred and be continuing; and (c) no Event of Default or Default shall have
occurred.

        7.2. TERMS OF SALE. Loans and Letters of Credit shall be made or issued,
as the case may be, only against Export Orders and Indirect Export Orders,
copies of which have been delivered to the Bank and which are maintained on file
with the Borrower. With respect to Loans and Letters of Credit to be made or
issued, as the case may be, against Indirect Export Orders, if requested by the
Bank, a copy of each Direct Export Contract pursuant to which the Items will be
exported shall have been delivered to the Bank. Unless waived by the Bank and
the Eximbank, the Borrower must execute an assignment of any contract and the
proceeds thereof in favor of the Bank, for the benefit of any Loan or Letter of
Credit related thereto, such assignment to be in form and substance satisfactory
to the Bank. Each Loan and Letter of Credit hereunder is subject to the


                                      -13-
<PAGE>   19


condition precedent that the Bank shall have reviewed and approved in its sole
discretion the terms and conditions, including without limitation that there
exists satisfactory evidence that the Items will in fact be exported, of the
applicable Export Order or Indirect Export Order and, if required by the Bank,
any Direct Export Contracts.

        7.3. GOVERNMENTAL APPROVALS. The Borrower, each Subsidiary, the
Guarantors, and the Bank shall have obtained all Governmental Approvals required
for the making and carrying out of this Agreement, the making of the Loans and
the issuance of Letters of Credit pursuant hereto and the issuance of the Note
to evidence such Loans and the execution, delivery and performance of the
applicable Export Order or Indirect Export Order. Without limitation of the
foregoing, no Loan shall be made or Letter of Credit issued hereunder (a) in
violation of the Eximbank Guaranty or contrary to the instructions of the
Eximbank; (b) following the occurrence of an event of default or of any event
which but for the giving of notice or the lapse of time or both would constitute
and event of default pursuant to Section 4.5 of the Eximbank Guaranty; or (c)
without the prior written approval of the Bank and the Eximbank subsequent to
the event of an occurrence under any insurance policy referred to in Section 8.7
hereof.

        7.4. BORROWING DOCUMENTS; INTERNATIONAL BORROWING BASE CERTIFICATE. The
Bank shall have timely received from the Borrower a duly executed and completed
Request for Borrowing in respect of Loans to be made on such Borrowing Date, an
International Borrowing Base Certificate dated within the past five (5) Business
Days, and such other documents and certificates relating to the transactions
herein contemplated as the Bank may reasonably request.

        7.5. LETTER OF CREDIT DOCUMENTS. On the date of the issuance of any
Letter of Credit, the Bank shall have received from the Borrower a Letter of
Credit Request in respect of Letters of Credit to be issued on such issuance
date together with such other documents and certificates relating to the
transactions herein contemplated as the Bank may reasonably request. Without
limitation of the foregoing, each Letter of Credit shall be issued only upon
receipt of an International Borrowing Base Certificate current within the past
five (5) Business Days.

        7.6. REQUIRED INITIAL DOCUMENTS AND CERTIFICATES. On or before the first
Loan is made, or Letter of Credit issued, hereunder (the "Initial Date"), the
Bank shall have received from the Borrower the following, in each case in form,
scope and substance satisfactory to the Bank:

        (i) the SBA/Eximbank Joint Application, duly executed by the parties
     thereto, together with the $100 application fee related thereto;

        (ii) the Borrower Agreement duly executed by the parties thereto;

        (iii) this Agreement, together with all schedules and exhibits thereto;

        (iv) the Note duly executed by the Borrower;

        (v) the International Security Agreement duly executed by the parties
     thereto;

        (vi) the International Guaranties duly executed by the Guarantors;


                                      -14-
<PAGE>   20


        (vii) an Officer's Certificate of the Borrower dated as of the Closing
     Date to which are attached true and correct copies of the articles of
     incorporation and bylaws of the Borrower and corporate resolutions duly
     adopted by the Board of Directors of the Borrower authorizing the
     transactions contemplated by the International Loan Documents;

        (viii) satisfactory results of on-line search as to the continued
     existence and good standing of the Borrower;

        (ix) satisfactory results of on-line search as to each state in which
     the Borrower is authorized and qualified to do business as to its due
     qualification and good standing;

        (x) an International Borrowing Base Certificate dated within five (5)
     Business Days preceding the Initial Date, as required by Section 7.4;

        (xi) copies of duly executed UCC-1 Financing Statements and all other
     requisite filing documents necessary to perfect the Liens granted pursuant
     to the International Security Documents and duly executed releases or
     assignments of Liens and UCC-3 financing statements in recordable form, and
     in form and substance satisfactory to the Bank, and filed with the
     appropriate filing offices, covering all of the Collateral subject thereto,
     as may be necessary to reflect that the Liens granted to the Bank are of
     the priority required by Section 9.1 hereof;

        (xii) a copy of the fully effective Eximbank insurance policy complying
     with the terms of Section 8.7 hereof, together with an assignment thereof
     in favor of the Bank;

        (xiii) the facility fee required under Section 4.1;

        (xiv) the Borrower's monthly inventory listing and accounts receivable
     aging schedule showing all of the Borrower's inventory and accounts
     receivable as of the last day of the calendar month immediately preceding
     the Initial Date;

        (xv) satisfactory completion of field analysis and due diligence of the
     Borrower to be performed by the Bank; and

        (xvi) the Borrower's and each Guarantor's financial statements and
     signed federal tax returns as contemplated in Sections 6.2 and 6.8(b).

        In addition, as of the Initial Date, all legal matters incident to the
transactions herein contemplated shall be reasonably satisfactory to the Bank.

        7.7. EXIMBANK ACKNOWLEDGMENT, ETC. On or before the Initial Date, the
Eximbank shall have received from the Bank copies of all documents required
pursuant to the Eximbank Guaranty. The Bank shall have received from the
Eximbank (a) an acknowledged Loan Authorization Notice executed by an Authorized
Officer evidencing the Eximbank's commitment to issue a guarantee pursuant to
the Bank's exercise of its delegated authority with respect to this Agreement,
together with all other acknowledged items referred to in Section 3 of the
Delegated


                                      -15-
<PAGE>   21


Authority Letter Agreement and (b) an acknowledgment of the Eximbank's receipt
of its portion of the facility fee referred to in Section 4.1 hereof.

        7.8. POST-CLOSING LIEN SEARCH. On or before the Initial Date, Bank shall
have received the results of all post-closing lien searches confirming that the
Bank has obtained a perfected security interest in the Collateral of the
priority required by Section 9.1.

        7.9. APPROVAL OF AUTHORIZED OFFICER. Eximbank requires that an
Authorized Officer approve in writing any Loan made, or Letter of Credit issued
hereunder. Such approval shall not be withheld provided all requirements set
forth herein and in the Borrower Agreement are fully complied with.

     8. AFFIRMATIVE COVENANTS. The Borrower covenants and agrees that, so long
as the Borrower may borrow hereunder and until payment in full of the Note, the
Borrower will:

        8.1. FINANCIAL STATEMENTS AND INFORMATION. Deliver to the Bank in
duplicate:

        (a) as soon as available, and in any event within one hundred twenty
     (120) days after the end of each fiscal year of the Borrower, the Annual
     Audited Financial Statements of (i) the Borrower and its Subsidiaries
     prepared on a consolidated basis, and (ii) each Guarantor;

        (b) as soon as available, and in any event within one hundred eighty
     (180) days after the end of each year, a copy of Borrower's and each
     Guarantor's signed federal tax returns, including federal income tax
     returns, and all supporting documentation;

        (c) as soon as available, and in any event within thirty (30) days after
     the end of each calendar month (including a month ending a fiscal year),
     Monthly Unaudited Financial Statements of the Borrower and its Subsidiaries
     prepared on a consolidated basis;

        (d) as soon as available, and in any event within twenty (20) Business
     Days after the end of each month, an International Borrowing Base
     Certificate dated within the past five (5) Business Days of the Bank's
     receipt thereof;

        (e) promptly after such request is submitted to the appropriate
     Governmental Authority, any request for waiver of funding standards or
     extension of amortization periods with respect to any employee benefit
     plan;

        (f) contemporaneously therewith or within 10 days thereafter copies of
     all statements and reports sent to the stockholders of the Borrower or any
     Subsidiary, or filed with the Securities and Exchange Commission;

        (g) such additional financial or other information as the Bank may
     reasonably request;


                                      -16-
<PAGE>   22


        (h) as soon as available, and in any event within 30 days after the end
     of each calendar month, the Borrower's monthly inventory listing and
     accounts receivable aging schedule showing all of the Borrower's inventory
     and accounts receivable; and

        (i) as soon as available, and in any event within forty-five (45) days
     after the end of each quarter, quarterly financial statements of the
     Borrower.


Together with each delivery of the Annual Audited Financial Statements, the
Borrower will deliver to the Bank an Compliance Certificate in the form of
Exhibit E hereto, stating that there exists no Event of Default or Default, or,
if any such Event of Default or Default exists, stating the nature thereof, the
period of existence thereof and what action the Borrower has taken or proposes
to take with respect thereto. The Bank is authorized to deliver a copy of any
information and financial statement delivered to it to the Eximbank and any
Governmental Authority having jurisdiction over the Bank.

        8.2. BOOKS AND RECORDS. Maintain, and cause its Subsidiaries to
maintain, proper books of record and account in accordance with GAAP in which
true, full and correct entries will be made of all its dealings and business
affairs.

        8.3. INSURANCE. Maintain, and cause its Subsidiaries to maintain,
insurance with financially sound, responsible and reputable companies in such
types (including, without limitation, fire and casualty) and amounts and against
such casualties, risks and contingencies as is customarily carried by owners of
similar businesses and Properties, and furnish to the Bank, together with each
delivery of financial statements under Section 8.1(a), an Officer's Certificate
containing full information as to the insurance carried. Without limiting the
generality of the foregoing, the Borrower will comply with the insurance
requirements set forth in each International Security Document to which the
Borrower is a party. For purposes hereof, the Borrower's types and amounts of
insurance set forth in Schedule 8.3 shall be acceptable to the Bank.

        8.4. INSPECTION OF PROPERTY AND RECORDS; AUDITS OF COLLATERAL.

        (a) Permit, and cause its Subsidiaries to permit, any Person designated
by the Bank in writing to visit and inspect any of the Properties, books and
financial records of the Borrower and its Subsidiaries and discuss its affairs
and finances with its officers, all at such times as the Bank may reasonably
request at a mutually agreeable time, and cause its officers and employees to
give full cooperation and assistance in connection therewith. Without limiting
the generality of the foregoing, the Borrower will permit, and cause its
Subsidiaries to permit, any officer or employee of, or agent designated by, the
Bank to have access to, examine and inspect the Collateral and to audit and make
extracts from the Borrower's records, files and books of account in order to
verify such Collateral.

        (b) The Borrower will, from time to time, on at least a semiannually
basis, permit the Bank, an independent certified public accountant or another
appropriate entity acceptable to the Bank to audit the Borrower's books, records
and procedures with respect to the Inventory, Accounts Receivable and other
Collateral. This inspection shall include a physical inspection of the
Collateral


                                      -17-
<PAGE>   23


in accordance with normal commercial lending practices, except that a book audit
shall be made of the Borrower's Accounts Receivable and any intangible
Collateral. Promptly after the conclusion of each such audit, the Borrower shall
pay to the Bank its reasonable and customary out-of-pocket expenses associated
with such audit.

        8.5. NOTICE OF CERTAIN MATTERS. Notify the Bank immediately upon
acquiring knowledge of the occurrence of any of the following events: (a) the
occurrence of any event having a Material Adverse Effect; (b) the occurrence of
any Event of Default or any Default; (c) the existence of any condition
requiring a mandatory prepayment pursuant to Section 3.1 hereof; (d) any failure
to pay when due any amount payable to the Bank by the Borrower, any Subsidiary
or any Guarantor under any non-Eximbank guaranteed loan(s) extended by the Bank
to the Borrower, any Subsidiary or any Guarantor; (e) the filing of an action
for debtor's relief by, against, or on behalf of the Borrower, any Subsidiary or
any Guarantor; (f) any actual or threatened breach of any Export Order, Indirect
Export Order or Direct Export Contract by any party to any such contract or (g)
any threatened or pending material litigation against the Borrower, any
Subsidiary or any Guarantor or any material dispute involving the Borrower, any
Subsidiary or any Guarantor. The Borrower shall promptly notify the Bank in
writing of the occurrence of any of the following: (a) the Borrower, any
Subsidiary or any Guarantor begins or consents in any manner to any proceeding
or arrangement for its liquidation in whole or in part or to any other
proceeding or arrangement whereby any of its liabilities or whereby any
receiver, trustee, liquidator or the like is appointed for it or any substantial
part of its assets (including, without limitation, the filing by the Borrower,
any Subsidiary or any Guarantor of a petition for appointment as a
debtor-in-possession under Title 11 of the U.S. Code); (b) the Borrower, any
Subsidiary or any Guarantor fails to obtain the dismissal or stay on appeal
within thirty (30) calendar days of the commencement of any proceeding
arrangement referred to in (a) above; (c) the Borrower, any Subsidiary or any
Guarantor begins any other procedure for the relief of financially distressed or
insolvent debtors, or such procedure has been commenced against it, whether
voluntarily or involuntarily, and such procedure has not been effectively
terminated, dismissed or stayed within thirty (30) calendar days after the
commencement thereof, or (d) the Borrower, any Subsidiary or any Guarantor
begins any procedure for its dissolution, or a procedure therefore has been
commenced against it.

        8.6. SECURITY AND FURTHER ASSURANCES. The Borrower shall, whenever and
as often as the Bank may reasonably request, at the Borrower's own expense,
promptly execute and deliver all such further instruments (including, without
limiting the generality of the foregoing, additional security agreements, deeds
of trust and financing statements) and do such other acts (including, without
limitation, field warehousing) as the Bank may reasonably request for the
purpose of protecting or perfecting any Lien created or granted or intended to
be created or granted in the International Security Documents or in order to
ensure that any such Lien is of the priority purported to be granted thereby and
as required by Section 9.1 hereof, or in order to police or protect any
Collateral or otherwise to carry out more effectually the purposes and intent of
the International Loan Documents.


                                      -18-
<PAGE>   24


        8.7. EXPORT INSURANCE.

        (a) Any Eligible Account Receivable to be covered by the Eximbank
insurance must be insured by the Eximbank pursuant to a policy in form and
substance, and in such amounts, satisfactory to the Bank;

        (b) any Eligible Account Receivable to be covered by private sector
insurance must be pursuant to a policy in form and substance, and in such
amounts, satisfactory to the Bank;

        (c) the Borrower shall keep each such policy in full force and effect
and timely pay all premiums thereon and deliver copies thereof to the Bank,
together with all endorsements, declarations, amendments and renewals;

        (d) the Borrower shall immediately notify the Bank of any loss related
to the accounts receivable and of any submission of a claim under any such
policy and upon the event of an occurrence thereunder;

        (e) the Borrower hereby assigns and grants to the Bank its rights to
claim payment(s) under any such policy, such assignments to be notified to the
policy issuers in the manner required by the Bank and a duly executed original
of each such notification to be delivered to the Bank; and

        (f) the proceeds of any such assignment paid to the Bank shall be
applied first towards reducing any amount then outstanding hereunder. Any excess
thereafter shall be promptly paid to the Borrower.

        8.8. MAINTENANCE OF PROPERTY. Cause its and each Subsidiary's material
Properties to be maintained, preserved, protected and kept in reasonably good
repair, working order and condition so that the business carried on in
connection therewith may be conducted properly and efficiently.

        8.9. EXISTENCE, LAWS AND OBLIGATIONS. Maintain, and cause each
Subsidiary to maintain, its existence, and pay, or cause to be paid, all taxes,
assessments, governmental charges, claims for labor, supplies, rent and other
obligations which if unpaid might become a Lien against the Property of the
Borrower or any Subsidiary; except liabilities which are being contested in good
faith and which are not owed to a Government Authority. The Borrower will
comply, and cause each Subsidiary to comply, with all Governmental Requirements
except where failure to so comply could not reasonably be expected to have a
Material Adverse Effect.

        8.10. ASSIGNMENT OF INTERNATIONAL LETTER OF CREDIT PROCEEDS. Each letter
of credit issued in favor of the Borrower with respect to the sale of Items to
be financed under this Agreement, if any, (a) shall be in form and substance
reasonably satisfactory to the Bank, and (b) shall be issued and/or confirmed in
the manner required by the Bank by financial institutions acceptable to the
Bank, and shall list the Bank as the advising and paying bank. If required by
the Bank, any such letter of credit shall provide for an assignment of proceeds
thereof, in form and substance satisfactory to the Bank.


                                      -19-
<PAGE>   25


        8.11. ENVIRONMENTAL MATTERS. At all times:

        (a) comply, and cause each Subsidiary to comply, with all applicable
     Governmental Requirements under and Governmental Approvals under
     Environmental Laws except where failure to so comply could not reasonably
     be expected to have a Material Adverse Effect;

        (b) promptly notify the Bank and provide copies upon receipt of all
     material written claims, complaints, notices or inquiries relating to the
     environmental condition of the facilities and Properties of the Borrower or
     any Subsidiary or its compliance with Environmental Laws; and

        (c) provide such information and certifications which the Bank may
     reasonably request from time to time to evidence compliance with this
     Section 8.11.

        8.12. CONTROLLING AFFILIATES. If any Person shall become a Controlling
Affiliate, then the Borrower will, and will cause such Controlling Affiliate to,
amend the International Loan Documents and execute additional documents as may
be required by the Bank or Eximbank.

     9. NEGATIVE COVENANTS. So long as the Borrower may borrow hereunder and
until payment in full of the Note, unless the Bank shall otherwise give its
prior written consent in its sole and absolute discretion:

        9.1. LIENS. The Borrower will not, and will not permit any Subsidiary to
create, incur, assume or permit to exist any Lien (including any charge upon
assets purchased under a conditional sales agreement, purchase money mortgage,
security agreement or other title retention agreement) upon any of its
Properties, or the proceeds thereof, whether now owned or hereafter acquired,
except (a) Permitted Liens and Liens set forth on Schedule 9.1, provided that
any such Lien (i) is not extended to any other Property, (ii) secures only
Indebtedness permitted by Section 9.6 and (iii) no such Lien shall encumber the
Collateral subject to the International Security Documents, (b) Liens in favor
of the Bank and Domestic Lenders created by the International Security Documents
and pursuant to the Domestic Security Documents, and (c) Liens permitted
pursuant to Section 8.2 of the Domestic Credit Agreement. NOTHING WITHIN THIS
SECTION SHALL PERMIT THE BORROWER TO TAKE ANY ACTION WHICH WOULD CAUSE THE LIEN
ON THE INTERNATIONAL COLLATERAL CREATED IN FAVOR OF THE BANK PURSUANT TO THE
INTERNATIONAL SECURITY DOCUMENTS TO FAIL TO BE A VALID FIRST PRIORITY LIEN, AND
THE LIEN ON THE DOMESTIC COLLATERAL CREATED IN FAVOR OF THE BANK PURSUANT TO THE
INTERNATIONAL SECURITY DOCUMENTS TO BE A VALID LIEN WHICH IS JUNIOR IN PRIORITY
ONLY TO LIENS CREATED PURSUANT TO THE DOMESTIC SECURITY DOCUMENTS, AND THE
BORROWER WILL NOT TAKE ANY SUCH ACTION.

        9.2. MERGER, CONSOLIDATION, ETC. Without the prior written consent of
the Bank and the Eximbank, the Borrower will not merge or consolidate with any
other Person or sell, lease, transfer or otherwise dispose of (whether in one
transaction or a series of transactions) all or a substantial part of its assets
or any part of its assets which are essential to the conduct of its business or
operations or acquire (whether in one transaction or a series of transactions)
all or a substantial part of the assets of any Person or make any material
change in its corporate structure or identity,


                                      -20-
<PAGE>   26


or enter into any agreement to do any of the foregoing. Without the prior
written consent of the Bank and the Eximbank, the Borrower shall not form,
acquire or create any Subsidiary. Without the prior written consent of the Bank
and the Eximbank, the Borrower shall not, and will not permit any of its
Subsidiaries to, transfer, purchase or redeem, or permit any Subsidiary to
transfer, purchase or redeem, any shares of the Borrower's or any Subsidiary's
capital stock unless such transfer, purchase or redemption is effected solely
from the proceeds of and within a reasonable time after the issuance to third
parties by the Borrower or its Subsidiary of capital stock which is in addition
to the capital stock of the Borrower or its Subsidiary, as the case may be,
outstanding on the date hereof.

        9.3. NATURE OF BUSINESS; MANAGEMENT. Neither the Borrower nor any
Subsidiary will change its line of business from that described in Section 6.7
or enter into any business which is substantially different from such business.

        9.4. LOANS AND INVESTMENTS. The Borrower will not, and will not permit
any Subsidiary to, directly or indirectly, make or have outstanding any loans,
advances or other extensions of credit; or make or permit to remain outstanding
any capital contributions to, or purchase or own any stocks, bonds, notes,
debentures or other securities of, any Person other than as permitted by Section
8.8 of the Domestic Credit Agreement. This Section 9.4 shall not be construed to
prohibit advances made to employees, officers and directors in the usual,
customary and ordinary course of business.

        9.5. FINANCIAL COVENANTS. Throughout the term of this Agreement, the
Borrower shall comply with each of the financial tests in Section 7.3 of the
Domestic Credit Agreement. The Borrower shall deliver schedules reflecting the
calculation of such amounts and ratios concurrently with each set of financial
statements delivered under Section 8.1(a) of this Agreement.

        9.6. DEBT. The Borrower will not, and will not permit any Subsidiary to
create, incur, suffer or permit to exist, or assume or guarantee, directly or
indirectly, or become or remain liable with respect to any Indebtedness,
contingent or otherwise, except:

        (a) Indebtedness to the Bank;

        (b) Indebtedness previously approved by the Bank in writing on any date
     following the Closing Date;

        (c) current accounts payable and unsecured current liabilities, not the
     result of borrowing, to vendors, suppliers and persons providing services,
     for expenditures and/or goods and services normally required by it in the
     ordinary course of business and on ordinary trade terms, and liabilities
     related to deferred premiums for liability insurance;

        (d) Indebtedness set forth on Schedule 6.13 hereof or reflected in the
     Borrower's Annual Audited Financial Statements delivered to the Bank prior
     to the date hereof pursuant to Section 6.2, including any renewals or
     modifications, but not increases, thereof; and



                                      -21-
<PAGE>   27



        (e) Indebtedness permitted by Section 8.1(d) - (i) of the Domestic
     Credit Agreement.

        9.7. AFFILIATE TRANSACTIONS. The Borrower will not, and will not permit
any Subsidiary to enter into any transaction or agreement with any officer,
director or holder of any outstanding capital stock of the Borrower or any
Subsidiary (or any member of the family of such Person, or any Person
controlling, controlled by or under common control with such Person) unless the
same is upon terms substantially similar to those obtainable from wholly
unrelated sources. Without limitation of the foregoing, and except as expressly
permitted herein, in no event shall the Borrower or any Subsidiary make any
advances to any stockholder or affiliated or related entity (including but not
limited to, partnerships, joint ventures, joint stock companies, sister
companies, parent companies or subsidiaries). In the event that any such
advances are made, the Bank shall not make any further disbursements to the
Borrower hereunder without the prior written approval of Eximbank.

        9.8. RESTRICTED PAYMENTS. The Borrower will not (a) purchase, redeem,
retire or otherwise acquire, directly or indirectly, any shares of its capital
stock or other equity interests; (b) declare or pay any dividend (except stock
dividends); (c) make any other disposition of any Property or cash to owners of
an equity interest in their capacity as such; (d) Tax Dividends with respect to
its estimated taxable income; or (e) as allowed under Section 8.5 of the
Domestic Credit Agreement.

        9.9. CHANGE IN ACCOUNTING METHOD. The Borrower will not make any change
in the method of computing depreciation for either tax or book purposes or any
other material change in accounting method without prior written notice to the
Bank, except for any changes required by GAAP or applicable law. The Borrower
will not change its fiscal year.

        9.10. EXPORT ORDERS AND INDIRECT EXPORT ORDERS. The Borrower will not
consent to any material and adverse modification, supplement or waiver of any of
the provisions of any Export Order or any Indirect Export Order without the
prior consent of the Bank and excluding change orders in the ordinary course of
business; provided, no such modifications or change orders may be made if the
effect thereof would cause the Loans outstanding plus the Letter of Credit
Outstandings to exceed the International Borrowing Base if calculated after
taking into effect such modification or change. The Borrower will not assign or
terminate any of its obligations, nor will it consent to any assignment or
termination of any other Person's obligations, under any Export Order or any
Indirect Export Order without the prior written consent of the Bank.

        9.11. COPYRIGHTS, PATENTS AND SOFTWARE. Except for (a) Permitted Liens
and (b) Liens to secure the Domestic Obligations, neither the Borrower or any
Subsidiary will create or suffer to exist any Lien upon any of its copyrights,
patents, software or other similar Property now owned or hereafter acquired, or
acquire any copyrights, patents, software or other similar Property upon any
conditional sale or other title retention device or arrangement or any purchase
money security agreement; or in any manner directly or indirectly sell, assign,
pledge or otherwise transfer any of its copyrights, patents, software or other
similar Property; provided, however, that Borrower shall be entitled to sell
software in the ordinary course of business and Borrower shall be entitled to
assign rights to market its software for sale in the ordinary course of its
business.


                                      -22-
<PAGE>   28


         9.12. EXIMBANK VIOLATIONS. Notwithstanding anything herein to the
contrary, neither the Borrower nor any Subsidiary or Guarantor will take any
action which if taken would violate any rule, regulation or other requirement of
Eximbank applicable to such Borrower, Subsidiary or Guarantor, or violate any
agreement which such Borrower, Subsidiary or Guarantor has with Eximbank.

     10. EVENTS OF DEFAULT; REMEDIES. If any of the following events shall
occur, then the Bank may (a) by notice to the Borrower, declare the Commitment
of the Bank and the obligation of the Bank to make Loans and issue Letters of
Credit to be terminated, whereupon the same shall forthwith terminate, and (b)
declare the Note and all interest accrued and unpaid thereon, and all other
amounts payable under the Note and this Agreement, to be forthwith due and
payable, whereupon the Note, all such interest and all such other amounts, shall
become and be forthwith due and payable without presentment, demand, protest, or
further notice of any kind (including, without limitation, notice of default,
notice of intent to accelerate and notice of acceleration), all of which are
hereby expressly waived by the Borrower; provided, however, that with respect to
any Event of Default described in Section 10.5 hereof, (i) the Commitment of the
Bank and the obligation of the Bank to make Loans and issue Letters of Credit
hereunder shall automatically be terminated and (ii) the entire unpaid principal
amount of the Note, all interest accrued and unpaid thereon, and all such other
amounts payable under the Note and this Agreement, shall automatically become
immediately due and payable, without presentment, demand, protest, or any notice
of any kind (including, without limitation, notice of default, notice of intent
to accelerate and notice of acceleration), all of which are hereby expressly
waived by the Borrower.

         10.1. FAILURE TO PAY PRINCIPAL OR INTEREST. The Borrower does not pay,
repay or prepay any principal of the Note when due; or

         10.2. FAILURE TO PAY OTHER AMOUNTS. The Borrower does not pay any
interest on the Note, other obligation or amount payable under this Agreement or
the Note or any other International Loan Document to which it is a party when
due and such failure continues for a period of five days; or

         10.3. MISREPRESENTATION OR BREACH OF WARRANTY. Any representation or
warranty made by the Borrower, any Subsidiary or any Guarantor herein or in any
other International Loan Document or otherwise furnished to the Bank in
connection with this Agreement shall be incorrect, false or misleading in any
material respect when made; or

         10.4. VIOLATION OF COVENANTS. The Borrower, any Subsidiary or any
Guarantor violates any covenant, agreement or condition contained herein or in
any other International Loan Document to which it is a party; or

         10.5. BANKRUPTCY AND OTHER MATTERS. (i) The Borrower, any Subsidiary or
any Guarantor begins or consents in any manner to any proceeding or arrangement
for its liquidation in whole or in part or to any other proceeding or
arrangement whereby any of its assets are subject generally to the payment of
its liabilities or whereby any receiver, trustee, liquidator or the like is
appointed for it or any substantial part of its assets (including without
limitation the filing by the Borrower, any Subsidiary or any Guarantor of a
petition for appointment as a debtor-in-possession


                                      -23-
<PAGE>   29


under Title 11 of the U.S. Code); (ii) the Borrower, any Subsidiary or any
Guarantor fails to obtain the dismissal or stay on appeal within thirty (30)
calendar days of the commencement of any proceeding arrangement referred to in
(i) above; (iii) the Borrower, any Subsidiary or any Guarantor begins any other
procedure for the relief of financially distressed or insolvent debtors, or such
procedure has been commenced against it, whether voluntarily or involuntarily,
and such procedure has not been effectively terminated, dismissed or stayed
within thirty (30) calendar days after the commencement thereof; (iv) the
Borrower, any Subsidiary or any Guarantor begins any procedure for its
dissolution, or a procedure therefor has been commenced against it; or (v) the
Borrower, any Subsidiary or any Guarantor shall fail generally to pay its debts
as they become due; or

         10.6. DISSOLUTION. Any order is entered in any proceeding against the
Borrower or any Subsidiary decreeing the dissolution, liquidation, winding-up or
split-up of the Borrower or any Subsidiary; or

         10.7. LIENS. The Borrower, any Subsidiary or any Guarantor claims, or
any court finds or rules, that the Bank does not have a valid Lien or a Lien of
the purported priority as provided in any International Security Document; or

         10.8. COLLATERAL. The Borrower or any Subsidiary sells, encumbers or
abandons (except as otherwise expressly permitted by the International Loan
Documents) any of the Property now or hereafter subject to any of the
International Security Documents (other than the sale of inventory in the normal
course of business); or any levy, seizure, or attachment is made thereof or
thereon; or such Property is lost, stolen, substantially damaged or destroyed;
or

         10.9. INTERNATIONAL SECURITY DOCUMENTS. The Borrower violates any
covenant, agreement or condition contained in any International Security
Documents or any default or event of default otherwise occurs thereunder; or

         10.10. CROSS-DEFAULT TO EXPORT ORDERS, INDIRECT EXPORT ORDERS AND
DIRECT EXPORT CONTRACTS. The Borrower is in breach of any material provision of
any Export Order, any Indirect Export Order or any Direct Export Contract; or

         10.11. CROSS-DEFAULT TO DOMESTIC LOAN DOCUMENTS. An event of default
shall occur under any of the Domestic Loan Documents, unless the same shall have
been waived in accordance with the terms thereof; or

         10.12. CROSS-DEFAULT TO NON-EXIMBANK DEBT. The Borrower, any Subsidiary
or any Guarantor does not pay when due any amount payable to the Bank under any
loan or other extension of credit from the Bank to the Borrower, any Subsidiary
or any Guarantor which is not guaranteed by the Eximbank, unless the same shall
have been waived by the Bank in accordance with the terms thereof; or

         10.13. CROSS-ACCELERATION TO OTHER DEBT. Any event occurs which results
in acceleration of any Indebtedness in excess of $3,000,000 of the Borrower, any
Subsidiary or any Guarantor or if default shall be made in the payment of any
such Indebtedness at the stated maturity thereof, after any applicable period of
grace; or


                                      -24-
<PAGE>   30


         10.14. UNDISCHARGED JUDGMENT. Final judgment shall be rendered against
the Borrower, any Subsidiary or any Guarantor and the same shall remain
undischarged for a period of thirty (30) days during which execution shall not
be effectively stayed, released, bonded or vacated; or

         10.15. CROSS-DEFAULT TO BORROWER AGREEMENT. The Borrower violates any
covenant, agreement or condition contained in the Borrower Agreement or any
default or event of default otherwise occurs thereunder; or

         10.16. CHANGE OF CONTROL. A Change of Control shall occur; or

         10.17. CONTROLLING AFFILIATES. A Person, other than those in compliance
with Section 8.12, shall become a Controlling Affiliate of the Borrower; or

         10.18. IMPAIRMENT OF EXIMBANK GUARANTY. The Eximbank Guaranty shall
cease to be in full force and effect or shall be declared null and void or the
validity or enforceability thereof shall be contested, challenged or denied by
the Eximbank, the Borrower, any Governmental Authority, any Affiliate of the
Borrower, any Subsidiary or any Guarantor; or

         10.19. IMPAIRMENT OF INTERNATIONAL LOAN DOCUMENTS, EXPORT ORDERS,
INDIRECT EXPORT ORDERS AND DIRECT EXPORT CONTRACTS. This Agreement, the Note,
any Export Order, any Indirect Export Order, any Direct Export Contract, or any
other International Loan Document shall cease to be in full force and effect or
shall be declared null and void or the validity or enforceability hereof or
thereof shall be contested, challenged or denied by the Borrower, any
Governmental Authority, any Affiliate of the Borrower, any Subsidiary or any
Guarantor, or any Lien created by the International Security Documents shall
cease to be in effect or shall cease to be a valid first priority Lien; or

         10.20. NEGATIVE PLEDGE ON SHARES. Any Lien shall exist on any of the
outstanding shares of the Borrower or any Subsidiary, except in favor of the
Domestic Lenders pursuant to the Domestic Loan Documents; or

         10.21. OTHER REMEDIES. In addition to and cumulative of any rights or
remedies expressly provided for in this Section 10, if any one or more Events of
Default shall have occurred, the Bank may proceed to protect and enforce its
rights hereunder by any appropriate proceedings and the Liens evidenced by the
International Security Documents shall be subject to foreclosure in any manner
provided for therein or provided for by law as the Bank may elect. The Bank may
also proceed either by the specific performance of any covenant or agreement
contained in this Agreement or the other International Loan Documents or by
enforcing the payment of the Note or by enforcing any other legal or equitable
right provided under this Agreement or the other International Loan Documents or
otherwise existing under any law in favor of the holder of the Note. The Bank
shall not, however, be under any obligation to marshall any assets in favor of
the Borrower or against or in payment of any or all obligations under any
International Loan Document. Upon the occurrence of an Event of Default, it is
hereby acknowledged and agreed that the Eximbank shall have the right to (a)
direct the Bank to make demand hereunder and under the other International Loan
Documents and (b) request that the Bank accelerate the maturities of any of the
Borrower's


                                      -25-
<PAGE>   31


non-Eximbank loans, and the Bank shall have no liability to the Borrower for
complying with such directions or requirements; or

         10.22. COLLATERAL ACCOUNT. The Borrower hereby agrees that in the event
of (a) the termination of the Commitment, or (b) the occurrence of an Event of
Default, it shall, if requested by the Bank, pay to the Bank an amount in
immediately available funds equal to 100% of the then aggregate amount of Letter
of Credit Outstandings, which funds shall be held by the Bank in a collateral
account to be maintained by the Bank. The Borrower hereby agrees to execute and
deliver to the Bank such security agreements, pledges or other documents as the
Bank may, from time to time, require to perfect the pledge, lien and security
interest in and to any such funds provided for in this Section 10.23. Upon the
payment or expiry of all Letter of Credit Outstandings, all such Collateral
shall be promptly released to the Borrower in due form at Borrower's cost.

         10.23. REMEDIES CUMULATIVE. No remedy, right or power conferred upon
the Bank is intended to be exclusive of any other remedy, right or power given
hereunder or now or hereafter existing at law, in equity, or otherwise, and all
such remedies, rights and powers shall be cumulative.

         10.24. DISTRIBUTIONS IN VIOLATION OF THE EXIMBANK GUARANTY. The
Borrower shall request and the Bank shall make a Disbursement in violation of
the Eximbank Guaranty.

         10.25. MATERIAL LITIGATION. Any material litigation is filed against
the Borrower and is not withdrawn within thirty (30) calendar days of filing.

     11. MISCELLANEOUS.

         11.1. REPRESENTATION BY THE BANK. The Bank represents that it is its
present intention, as of the date of its acquisition of the Note, to acquire the
Note for its account or for the account of its Affiliates, and not with a view
to the distribution or sale thereof, and, subject to any applicable laws, the
disposition of the Bank's Property shall at all times be within its control. The
Note has not been registered under the Securities Act of 1933, as amended (the
"Securities Act"), and may not be transferred, sold or otherwise disposed of
except (a) in a registered offering under the Securities Act; (b) pursuant to an
exemption from the registration provisions of the Securities Act; or (c) if the
Securities Act shall not apply to the Note or the transactions contemplated by
the International Loan Documents. Nothing in this Section 11.1 shall affect the
characterization of the Loans and the transactions contemplated hereunder as
commercial lending transactions.

         11.2. WAIVERS, ETC. No failure or delay on the part of the Bank in
exercising any power or right hereunder shall operate as a waiver thereof, nor
shall any single or partial exercise of any such right or power, or any
abandonment or discontinuance of steps to enforce such a right or power,
preclude any other or further exercise thereof or the exercise of any other
right or power. No course of dealing between the Borrower, any Subsidiary, the
Guarantors and the Bank shall operate as a waiver of any right of the Bank. No
modification or waiver of any provision of this Agreement, the Note or any other
International Loan Document nor consent to any departure by the Borrower
therefrom shall in any event be effective unless the same shall be in writing,
and then such waiver or consent shall be effective only in the specific instance
and for the purpose for which given. Except as otherwise provided by any
International Loan Document or applicable law, no notice to

                                      -26-

<PAGE>   32


or demand on the Borrower in any case shall entitle the Borrower to any other or
further notice or demand in similar or other circumstances.

         11.3. REIMBURSEMENT OF EXPENSES. WHETHER OR NOT THE TRANSACTIONS
CONTEMPLATED BY THIS AGREEMENT SHALL BE CONSUMMATED, THE BORROWER AGREES TO
REIMBURSE THE BANK FOR ITS REASONABLE OUT-OF-POCKET EXPENSES, INCLUDING THE
REASONABLE FEES AND EXPENSES OF COUNSEL TO THE BANK, IN CONNECTION WITH SUCH
TRANSACTIONS, OR ANY OF THEM, OR OTHERWISE IN CONNECTION WITH THIS AGREEMENT OR
ANY OTHER INTERNATIONAL LOAN DOCUMENT, INCLUDING (a) THE NEGOTIATION,
PREPARATION, EXECUTION, ADMINISTRATION, MODIFICATION AND ENFORCEMENT OF THIS
AGREEMENT OR ANY OTHER INTERNATIONAL LOAN DOCUMENT AND ALL FEES AND EXPENSES OF
ATTORNEYS TO THE BANK, AND (b) COSTS AND EXPENSES OF THE BANK IN CONNECTION WITH
DUE DILIGENCE, TRANSPORTATION AND DUPLICATION. THE BORROWER AGREES TO PAY ANY
AND ALL STAMP AND OTHER TAXES WHICH MAY BE PAYABLE OR DETERMINED TO BE PAYABLE
IN CONNECTION WITH THE EXECUTION AND DELIVERY OF THIS AGREEMENT, THE NOTE OR ANY
OTHER INTERNATIONAL LOAN DOCUMENT, AND TO SAVE ANY HOLDER OF THE NOTE HARMLESS
FROM ANY AND ALL LIABILITIES WITH RESPECT TO OR RESULTING FROM ANY DELAY OR
OMISSION TO PAY ANY SUCH TAXES. THE OBLIGATIONS OF THE BORROWER UNDER THIS
SECTION 11.3 SHALL SURVIVE THE TERMINATION OF THIS AGREEMENT AND/OR THE PAYMENT
OF THE NOTE.

         11.4. NOTICES. All notices and other communications provided for herein
shall be in writing (including facsimile or cable communication) and shall be
mailed, telecopied, cabled or delivered, addressed as follows:

                                      -27-

<PAGE>   33


               (a) If to the Borrower, to it at:

                   National Tank Company
                   Brookhollow Central III
                   2950 North Loop West, Suite 750
                   Houston, Texas 77092
                   Attention:     Mr. William B. Wiener III
                   Telephone No.: (713) 685-8020
                   Telefax No.:   (713) 683-7841

               (b) If to the Bank, to it at:

                   Texas Commerce Bank National Association
                   712 Main Street
                   Houston, Texas 77002
                   Attention:     Mrs. Mona M. Foch
                                  Vice President
                   Telephone No.: (713) 216-5911
                   Telefax No.:   (713) 216-4227

                   Attention: Mr. William L. McCollum
                                  International Banking Officer
                   Telephone No.: (713) 216-8603
                   Telefax No.:   (713) 216-4499

or to such other address as shall be designated by such party in a written
notice to the other party. All such notices and communications shall, when
mailed, telecopied, transmitted, or cabled, become effective when deposited in
the mail, transmitted to the telecopier, or delivered to the cable company,
except that notices and communications to the Bank shall not be effective until
actually received by the Bank.

         11.5. GOVERNING LAW. UNLESS OTHERWISE SPECIFIED THEREIN, EACH
INTERNATIONAL LOAN DOCUMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF TEXAS AND THE UNITED STATES OF AMERICA; provided,
however, that Chapter 15 of Subtitle 3, Title 79, Revised Civil Statutes of
Texas, 1925, as amended (Articles 5069-15.01 through 5069-15.11, Vernon's Texas
Civil Statutes, as amended) shall not apply to this Agreement and the Note
issued hereunder.

         11.6. SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS. All
representations, warranties and covenants contained herein or made in writing by
the Borrower in connection herewith shall survive the execution and delivery of
this Agreement and the Note, and will bind and inure to the benefit of the
respective successors and assigns of the parties hereto, whether so expressed or
not. No investigation at any time made by or on behalf of the Bank shall
diminish the Bank's right to rely thereon.


                                      -28-
<PAGE>   34


         11.7. COUNTERPARTS. This Agreement may be executed in several
counterparts, and by the parties hereto on separate counterparts, and each
counterpart, when so executed and delivered, shall constitute an original
instrument, and all such separate counterparts shall constitute but one and the
same instrument.

         11.8. SEPARABILITY. Should any clause, sentence, paragraph or Section
of this Agreement be judicially declared to be invalid, unenforceable or void,
such decision shall not have the effect of invalidating or voiding the remainder
of this Agreement, and the parties hereto agree that the part or parts of this
Agreement so held to be invalid, unenforceable or void will be deemed to have
been stricken herefrom and the remainder will have the same force and
effectiveness as if such part or parts had never been included herein.

         11.9. DESCRIPTIVE HEADINGS. The section headings in this Agreement have
been inserted for convenience only and shall be given no substantive meaning or
significance whatsoever in construing the terms and provisions of this
Agreement.

         11.10. ACCOUNTING TERMS. All accounting terms used herein which are not
expressly defined in this Agreement, or the respective meanings of which are not
otherwise qualified, shall have the respective meanings given to them in
accordance with GAAP.

         11.11. LIMITATION OF LIABILITY. No claim may be made by the Borrower or
the Affiliates, directors, officers, employees, attorneys, or agents of the
Borrower against the Bank or the Affiliates, directors, officers, employees,
attorneys, or agents of the Bank for any special, indirect, consequential or
punitive damages in respect of any claim for breach of contract arising out of
or related to the transactions contemplated by this Agreement, or any act,
omission, or event occurring in connection herewith; and the Borrower hereby
waives, releases, and agrees not to sue upon any claim for any such damages,
whether or not accrued and whether or not known or suspected to exist in its
favor.

         11.12. SET-OFF. If an Event of Default has occurred and is continuing,
the Borrower hereby gives and confirms to the Bank a right of set-off of all
moneys, securities and other property of the Borrower (whether special, general
or limited) and the proceeds thereof, now or hereafter delivered to remain with
or in transit in any manner to the Bank, its correspondents or its agents from
or for the Borrower, whether for safekeeping, custody, pledge, transmission,
collection or otherwise or coming into possession of the Bank in any way, and
also, any balance of any deposit accounts and credits of the Borrower with, and
any and all claims of security for the payment of the Note and of all other
liabilities and obligations now or hereafter owed by the Borrower to the Bank,
contracted with or acquired by the Bank, whether such liabilities and
obligations be joint, several, absolute, contingent, secured, unsecured, matured
or unmatured, and the Borrower hereby authorizes the Bank at any time or times,
without prior notice, to apply such money, securities, other property, proceeds,
balances, credits of claims, or any part of the foregoing, to such liabilities
in such amounts as it may select, whether such liabilities be contingent,
unmatured or otherwise, and whether any collateral security therefor is deemed
adequate or not. The rights described herein shall be in addition to any
collateral security described in any separate agreement executed by the
Borrower.


                                      -29-
<PAGE>   35


         11.13. SALE OR ASSIGNMENT. The Bank may assign its rights hereunder and
under each other International Loan Document and the Liens granted pursuant to
the International Security Documents only to the Eximbank in accordance with the
terms and conditions of the Eximbank Guaranty. Notwithstanding the foregoing,
the Bank may assign, transfer, negotiate, sell or participate all or part of its
interests and rights in the Loans and Letters of Credit to an Affiliate or
Subsidiary of the Bank, provided that the Bank retains all obligations under the
Eximbank Guaranty with respect to the Eximbank.

         11.14. INTEREST. All agreements between the Borrower, the Guarantors
and the Bank, whether now existing or hereafter arising and whether written or
oral, are hereby expressly limited so that in no contingency or event
whatsoever, whether by reason of demand being made on the Note or otherwise,
shall the amount paid, or agreed to be paid, to the Bank for the use,
forbearance, or detention of the money to be loaned under this Agreement or
otherwise or for the payment or performance of any covenant or obligation
contained herein or in any other International Loan Document exceed the Highest
Lawful Rate. If, as a result of any circumstances whatsoever, fulfillment of any
provision hereof or of any of such documents, at the time performance of such
provision shall be due, shall involve transcending the limit of validity
prescribed by applicable usury law, then, ipso facto, the obligation to be
fulfilled shall be reduced to the limit of such validity, and if, from any such
circumstance, the Bank shall ever receive interest or anything which might be
deemed interest under applicable law which would exceed the Highest Lawful Rate,
such amount which would be excessive interest shall be applied to the reduction
of the principal amount owing on account of the Note or the amounts owing on
other obligations of the Borrower or the Guarantors to the Bank under any
International Loan Document and not to the payment of interest, or if such
excessive interest exceeds the unpaid principal balance of the Note and the
amounts owing on other obligations of the Borrower and the Guarantors to the
Bank under any International Loan Document, as the case may be, such excess
shall be refunded to the Borrower or the Guarantor, as applicable. All sums paid
or agreed to be paid to the Bank for the use, forbearance, or detention of the
indebtedness of the Borrower and the Guarantors to the Bank shall, to the extent
permitted by applicable law, be amortized, prorated, allocated, and spread
throughout the full term of such indebtedness until payment in full of the
principal thereof (including the period of any renewal or extension thereof) so
that the interest on account of such indebtedness shall not exceed the Highest
Lawful Rate. Notwithstanding anything to the contrary contained in this
Agreement or the Note, it is understood and agreed that if at any time the rate
of interest which accrues on the outstanding principal balance of the Note shall
exceed the Highest Lawful Rate, the rate of interest which accrues on the
outstanding principal balance of the Note shall be limited to the Highest Lawful
Rate, but any subsequent reductions in the rate of interest which accrues on the
outstanding principal balance of the Note shall not reduce the rate of interest
which accrues on the outstanding principal balance of the Note below the Highest
Lawful Rate until the total amount of interest accrued on the outstanding
principal balance of the Note equals the amount of interest which would have
accrued if such interest rate had at all times been in effect. The terms and
provisions of this Section 11.14 shall control and supersede every other
provision of all agreements between the Borrower, the Guarantors and the Bank.

         11.15. INDEMNIFICATION. THE BORROWER AGREES TO INDEMNIFY, DEFEND, AND
SAVE HARMLESS THE BANK AND ITS OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, AND
ATTORNEYS, AND EACH OF THEM (THE "INDEMNIFIED PARTIES"), FROM AND AGAINST ALL
CLAIMS, ACTIONS, SUITS, AND OTHER LEGAL


                                      -30-
<PAGE>   36


PROCEEDINGS, DAMAGES, COSTS, INTEREST, CHARGES, TAXES (OTHER THAN THE BANK'S
FRANCHISE TAXES OR TAXES ON INCOME), COUNSEL FEES, AND OTHER EXPENSES AND
PENALTIES WHICH ANY OF THE INDEMNIFIED PARTIES MAY SUSTAIN OR INCUR BY REASON OF
OR ARISING OUT OF (i) THE MAKING OF ANY LOAN HEREUNDER, THE EXECUTION AND
DELIVERY OF THIS AGREEMENT, THE NOTE AND THE OTHER INTERNATIONAL LOAN DOCUMENTS
AND THE CONSUMMATION OF THE TRANSACTIONS CONTEMPLATED THEREBY AND THE EXERCISE
OF ANY OF THE BANK'S RIGHTS UNDER THIS AGREEMENT, THE NOTE AND THE OTHER
INTERNATIONAL LOAN DOCUMENTS OR OTHERWISE, INCLUDING, WITHOUT LIMITATION,
DAMAGES, COSTS, AND EXPENSES INCURRED BY ANY OF THE INDEMNIFIED PARTIES IN
INVESTIGATING, PREPARING FOR, DEFENDING AGAINST, OR PROVIDING EVIDENCE,
PRODUCING DOCUMENTS, OR TAKING ANY OTHER ACTION IN RESPECT OF ANY COMMENCED OR
THREATENED LITIGATION UNDER ANY FEDERAL SECURITIES LAW OR ANY SIMILAR LAW OF ANY
JURISDICTION OR AT COMMON LAW OR (ii) ANY VIOLATIONS OF ANY LAW OR ANY ACTION
TAKEN OR OMITTED TO BE TAKEN WHICH COULD RESULT IN A VIOLATION OF ANY
ENVIRONMENTAL LAW, OR IMPOSE ANY LIABILITY ON THE INDEMNIFIED PARTIES FOR DAMAGE
TO HEALTH OR THE ENVIRONMENT; AND PROVIDED FURTHER THAT NO INDEMNIFIED PARTY
SHALL BE ENTITLED TO THE BENEFITS OF THIS SECTION 11.15 TO THE EXTENT ITS OWN
GROSS NEGLIGENCE OR WILLFUL MISCONDUCT CONTRIBUTED TO ITS LOSS; AND PROVIDED
FURTHER THAT IT IS THE INTENTION OF THE BORROWER TO INDEMNIFY THE INDEMNIFIED
PARTIES AGAINST THE CONSEQUENCES OF THEIR OWN NEGLIGENCE. THIS AGREEMENT IS
INTENDED TO PROTECT AND INDEMNIFY THE INDEMNIFIED PARTIES AGAINST ALL RISKS
HEREBY ASSUMED BY THE BORROWER. THE OBLIGATIONS OF THE BORROWER UNDER THIS
SECTION 11.15 SHALL SURVIVE ANY EXERCISE OF THE POWER OF SALE GRANTED IN ANY
INTERNATIONAL SECURITY DOCUMENT TO WHICH THE BORROWER IS A PARTY, ANY
FORECLOSURE OF THE LIENS CREATED BY ANY INTERNATIONAL SECURITY DOCUMENT TO WHICH
THE BORROWER IS A PARTY, OR CONVEYANCE IN LIEU OF FORECLOSURE, THE REPAYMENT OF
THE NOTE, THE DISCHARGE AND RELEASE OF ANY PERSON UNDER ANY INTERNATIONAL LOAN
DOCUMENT AND ANY TERMINATION OF THIS AGREEMENT.

         11.16. PAYMENTS SET ASIDE. To the extent that the Borrower makes a
payment or payments to the Bank or the Bank enforces any security interest or
exercises its right of setoff, and such payment or payments or the proceeds of
such enforcement or setoff or any part thereof are subsequently invalidated,
declared to be fraudulent or preferential, set aside and/or required to be
repaid to a trustee, receiver or any other Person under any Debtor Law or
equitable cause, then, to the extent of such recovery, the obligation or part
thereof originally intended to be satisfied, and all rights and remedies
therefor, shall be revived and shall continue in full force and effect as if
such payment had not been made or such enforcement or setoff had not occurred.

         11.17. LOAN AGREEMENT CONTROLS. If there are any conflicts or
inconsistencies between this Agreement and any of the other International Loan
Documents, the provisions of this Agreement shall prevail and control.

         11.18. FINAL AGREEMENT. THIS WRITTEN AGREEMENT AND THE INTERNATIONAL
LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.


                                      -31-
<PAGE>   37


         11.19. WAIVER OF JURY TRIAL. TO THE FULLEST EXTENT PERMITTED BY
APPLICABLE LAWS, THE PARTIES HERETO HEREBY WAIVE ANY RIGHT TO A TRIAL BY JURY IN
ANY ACTION OR PROCEEDING TO ENFORCE OR DEFEND ANY RIGHTS OR REMEDIES UNDER THIS
AGREEMENT OR INTERNATIONAL LOAN DOCUMENTS, OR ARISING FROM ANY FINANCING
RELATIONSHIP EXISTING IN CONNECTION WITH THIS AGREEMENT OR ANY INTERNATIONAL
LOAN DOCUMENT AND AGREE THAT ANY ACTION OR PROCEEDING SHALL BE TRIED BEFORE A
COURT AND NOT BEFORE A JURY.

         IN WITNESS WHEREOF, the parties hereto, by their respective officers
thereunto duly authorized, have executed this Agreement effective as of June 30,
1997.

                                       NATIONAL TANK COMPANY



                                       By: /s/ WILLIAM B. WIENER, III
                                           -------------------------------------
                                       Name: William B. Wiener III
                                       Title: Senior Vice President


Commitment:                            TEXAS COMMERCE BANK
                                        NATIONAL ASSOCIATION
$3,000,000.00

                                       By: /s/ MONA M. FOCH
                                           -------------------------------------
                                       Name: Mona M. Foch
                                       Title: Vice President


                                       By: /s/ WILLIAM L. MCCOLLUM
                                           -------------------------------------
                                       Name: William L. McCollum
                                       Title: International Banking Officer

                                      -32-

<PAGE>   38


                                   EXHIBIT "A"

                               CERTAIN DEFINITIONS

     As used herein, the following words and terms shall have the respective
meanings indicated opposite each of them:

     "Accounts Receivable" shall have the meaning set forth in the Borrower
Agreement.

     "Adjusted Indebtedness" shall mean, as to the Borrower, as at any date,
Indebtedness minus Subordinated Debt.

     "Adjusted Tangible Net Worth" shall mean, as to the Borrower, as at any
date, stockholder's equity in the Borrower minus goodwill, other intangible
assets, loans and advances to equity holders and loans to Affiliates, plus
Subordinated Debt.

     "Affiliate" shall have the meaning set forth in Section 5 of the Delegated
Authority Letter Agreement.

     "Agreement" shall mean this International Revolving Loan Agreement, as the
same may be amended, modified or supplemented from time to time.

     "Annual Audited Financial Statements" shall mean, as to any Person, the
year-end financial statements of such Person (balance sheet, income statement,
cash flow statement), all prepared in conformity with GAAP and audited by
independent certified public accountants reasonably satisfactory to the Bank.

     "Application" shall mean an application, in such form as the Bank may
specify from time to time, requesting the Bank to open a Letter of Credit.

     "Authorized Officer" shall have the meaning set forth in Section 4 of the
Delegated Authority Letter Agreement.

     "Base Rate" shall mean, for any day, a rate per annum (rounded upward to
the nearest 1/16 of 1%) equal to the greater of (a) the Prime Rate (computed on
the basis of the actual number of days elapsed over a year of 360 days) in
effect on such day and (b) the Federal Funds Rate in effect for such day. For
purposes of this Agreement, any change in the Base Rate due to a change in the
Federal Funds Rate shall be effective on the effective date of such change in
the Federal Funds Rate. If for any reason the Bank shall have determined (which
determination shall be conclusive and binding, absent manifest error) that it is
unable to ascertain the Federal Funds Rate for any reason, including, without
limitation, the inability or failure of the Bank to obtain sufficient binds or
publications in accordance with the terms thereof, the Base Rate shall be the
Prime Rate until the circumstances giving rise to such inability no longer
exist.

     "Base Rate Loan" shall mean any Loan which bears interest at the Base Rate.

                                      -1-

<PAGE>   39


     "Borrower Agreement" shall mean the Borrower Agreement dated as of the
Closing Date, executed and delivered by the Borrower, and acknowledged by the
Bank.

     "Borrowing Date" shall have the meaning set forth in Section 2.1(c).

     "Business Day" shall mean a day when the Bank is open for business,
provided that, if the applicable Business Day relates to any LIBOR Rate Loan, it
shall mean a day when the Bank is open for business and on which commercial
banks are open for international business (including dealings in Dollar
deposits) in London.

     "Buyer" shall mean an entity which has entered into one or more Export
Orders or Indirect Export Orders with the Borrower.

     "Change of Control" shall mean any change in the percentage ownership of
the outstanding voting shares of the Borrower identified in Schedule 6.5.

     "Closing Date" shall mean June 30, 1997.

     "Code" shall mean the Internal Revenue Code of 1986, as amended, as now or
hereafter in effect, together with all regulations, rulings and interpretations
thereof or thereunder issued by the Internal Revenue Service.

     "Collateral" shall mean collectively the Domestic Collateral and the
International Collateral.

     "Collateral Value" shall have the meaning set forth in the Borrower
Agreement.

     "Commitment" shall have the meaning set forth in Section 2.1(a).

     "Controlling Affiliate" shall have the meaning set forth in Section 5 of
the Delegated Authority Letter Agreement.

     "Conversion/Continuation Date" shall have the meaning set forth in Section
2.9(a).

     "Country Limitation Schedule" shall have the meaning set forth in the
Borrower Agreement.

     "Debtor Laws" shall mean all applicable liquidation, conservatorship,
bankruptcy, moratorium, arrangement, receivership, insolvency, reorganization,
or similar laws, or general equitable principles from time to time in effect
affecting the rights of creditors generally.

     "Default" shall mean any of the events specified in Section 10, whether or
not there has been satisfied any requirement in connection with such event for
the giving of notice, or the lapse of time, or the happening of any further
condition, event or act.

     "Determination Date" shall have the meaning set forth in Section 2.2(c).

                                      -2-

<PAGE>   40


     "Delegated Authority Letter Agreement" shall mean the Delegated Authority
Letter Agreement issued by Eximbank to the Bank

     "Direct Export Contract" shall mean each contract pursuant to which a Buyer
under an Indirect Export Order exports goods incorporating the Items.

     "Dollars" and "$" shall mean lawful currency of the United States of
America.

     "Domestic Collateral" shall have the meaning set forth in the International
Security Agreement.

     "Domestic Credit Agreement" shall mean the Loan Agreement dated June 30,
1997 between the Borrower and the Domestic Lenders, as the same may be amended
from time to time.

     "Domestic Lenders" shall mean the Bank, as agent and lender, and the other
lenders who are a party to the Domestic Credit Agreement.

     "Domestic Loan Documents" shall mean the Domestic Credit Agreement, the
Domestic Notes, and the Domestic Security Documents and, the agreements,
documents, instruments and other writings related to or executed in connection
with the foregoing documents, all other assignments, deeds, guaranties, pledges,
instruments, certificates and agreements now or hereafter executed or delivered
to the Domestic Lenders pursuant to any of the foregoing, and all amendments,
modifications, renewals, extensions, increases and rearrangements of, and
substitutions for, any of the foregoing.

     "Domestic Notes" shall mean all notes of the Borrower made in connection
with the Domestic Credit Agreement, including the Revolving Notes and the Term
Notes made to each of the Domestic Lenders, together with any and all renewals,
extensions, modifications, rearrangements, increases and replacements thereof
and substitutions therefor.

     "Domestic Obligations" shall mean the Borrower's obligations arising under
the Domestic Loan Documents to repay the loans thereunder and all other
indebtedness of the Borrower to the Bank under the Domestic Loan Documents of
any nature and in any amount whatsoever, whether now or hereafter arising.

     "Domestic Security Documents" shall mean, collectively, as the same may be
amended or modified from time to time, those certain security agreements
executed by the Borrower in favor of the Domestic Lenders from time to time, and
any and all other agreements, deeds of trust, mortgages, chattel mortgages,
security agreements, pledges, guaranties, assignments of production or proceeds
of production, assignments of income, assignments of contract rights,
assignments of partnership interests, assignments of royalty interests,
assignments of performance, completion or surety bonds, standby agreements,
subordination agreements, undertakings and other instruments and financing
statements now or hereafter executed and delivered by any Person in connection
with, or as security for the payment or performance of indebtedness of the
Borrower to the Domestic Lenders under or in connection with the Domestic Loan
Documents.

     "Drawings" still have the meaning set forth in Section 2.5(b).

                                      -3-

<PAGE>   41


     "Eligible Accounts Receivable" shall mean Accounts Receivable of the
Borrower meeting all of the following criteria as of the date of any
determination of Eligible Accounts Receivable: (a) the account debtor is not, in
the opinion of the Bank, unsatisfactory as to creditworthiness; (b) the account
debtor's obligation to pay the account receivable is not conditional upon such
account debtor's approval or the account receivable is not subject to any
repurchase obligation or return right other than warranty obligations in the
ordinary course of business; (c) the account receivable shall arise from the
performance by the Borrower of services which have been fully and satisfactorily
performed, or from the absolute sale by the Borrower of goods (i) in which the
Borrower or any of its Subsidiaries had sole and complete ownership and (ii)
which have been shipped and delivered to the account debtor, which shall
evidence which such obligee has possession of shipping and delivery receipts;
(d) the account receivable shall arise in the ordinary course of business of the
Borrower thereon, and no notice of bankruptcy or insolvency of the account
debtor (unless such account debtor's obligations are secured by a letter of
credit or bond), nor any notice of such account debtor's inability to pay its
debts as they become due, has been received by the Borrower of such account
receivable; and (e) for which the account debtor is contractually obligated to
pay. In addition, pursuant to the requirements of the Eximbank, the following
criteria must be met as of such date: (a) the account receivable is payable in
Dollars and is due and collected in the United States (unless Eximbank shall
otherwise give its prior written consent); (b) the account receivable is not
subject to set-off (other than commissions to salesmen in the normal course of
business), counterclaim, defense, allowance or adjustment other than
non-material claims for warranty, discounts for prompt payment shown on the
invoice, or to dispute, objection or complaint by the account debtor concerning
its liability on the account receivable, and the goods, the sale of which gave
rise to the account receivable, have not been returned, rejected, lost or
damaged; (c) the account receivable does not have a term in excess of one
hundred eighty (180) days; (d) the Bank has a valid and perfected first priority
Lien with respect thereto; (e) the account receivable is not more than sixty
(60) calendar days past the original invoice due date, unless it is insured
through Eximbank export credit insurance for comprehensive commercial and
political risk, or through Eximbank approved private insurers for comparable
coverage, in each case in form and substance satisfactory to the Bank in its
sole discretion, in which case ninety (90) calendar days shall apply, (f) the
account debtor is not a director, officer, employee or Affiliate of the
Borrower; (g) if the account receivable arises under an Export Order, such
account receivable is, at the option of the Bank: (i) fully supported by a
letter of credit complying with the terms of Section 8.10 hereof; or (ii)
insured by the Eximbank or private sector sources on terms and conditions
acceptable to the Bank, including, without limitation, terms complying with
Section 8.7 hereof or (iii) a result of a cash against documents, documentary
collection or cash prior to shipment transaction which is acceptable to the Bank
or (iv) on any other terms as approved by the Bank in its sole and absolute
discretion; (h) the account receivable is supported by an Export Order or an
Indirect Export Order complying with Section 7.2 hereof; (i) the account
receivable is not in the name of a Buyer (or, if the account receivable arises
under an Indirect Export Order, the name of a Person buying the Items from the
Buyer pursuant to a Direct Export Contract) located or incorporated in one of
those countries in which the Eximbank is prohibited from doing business (as
those countries are identified in the Country Limitation Schedule); (j) the
account receivable is not in the name of a Buyer (or, if the account receivable
arises under an Indirect Export Order, the name of a Person buying the Items
from the Buyer pursuant to a Direct Export Contract) located or incorporated in
one of those countries in which the Eximbank coverage is not available for
commercial reasons (as those countries are identified in the Country Limitation
Schedule), unless and only to the extent that the Items were sold to such Buyer
or such Person on terms of a Letter of Credit in form and substance satisfactory
to the Bank and issued or confirmed by a bank acceptable to the Bank and the

                                      -4-

<PAGE>   42


Eximbank; (k) the account receivable is not due pursuant to the sale of Items
which were purchased by a military Buyer or a Person for military purposes; (l)
if the account receivable arises under an Indirect Export Order, such account
receivable must result from the sale of Items by a Borrower to the Buyer for
export by the Buyer and (i) must be supported by documentation stating the name
and address (including country) of the ultimate foreign buyer and the U.S.-based
intermediary or (ii) on any other terms as approved by the Bank in its sole and
absolute discretion; (m) the account receivable is not, in the reasonable
opinion of the Bank or the Eximbank, uncollectible for any reason; (n) at least
fifty percent (50%) of the Item which was sold to create the account receivable
must be of U.S. Content; and (o) the account receivable shall not be generated
by the sale of defense articles or defense services. In addition, "Eligible
Accounts Receivable" shall also mean any account receivable of the Borrower
which is approved in writing by the Bank and the Eximbank. As used in this
definition, "Letter of Credit" shall mean an irrevocable letter of credit
subject to the UCP 500, payable in the United States or at the issuing bank and
issued for the benefit of the Borrower on behalf of a Buyer in connection with
the purchase of Items.

     "Eligible Inventory" shall mean Inventory of the Borrower meeting all of
the following criteria as of the date of determination of Eligible Inventory:
(a) the Inventory has not been returned, repossessed or damaged; (b) the
Inventory is not the subject of a canceled purchase order or otherwise not used
for the purpose for which it was originally manufactured or purchased; and (c)
the Inventory is not, in the opinion of the Bank exercising reasonable
discretion, unacceptable due to age, type, category, and/or quantity. In
addition, pursuant to the requirements of the Eximbank, the following criteria
must be met as of such date: (a) the Bank has a valid and perfected first
priority Lien with respect to such Inventory and such Inventory is in the
possession of such Borrower or its bailee and is not evidenced by any negotiable
or non-negotiable document of title; (b) the Inventory is not subject to a
buyer's rights which would be superior to the Lien of the Bank evidenced by the
International Security Documents; (c) the Inventory is located inside the United
States of America; (d) the Inventory is not to be used in manufacturing or
selling an Item to be purchased by a Buyer (or, if the Item is to be sold
pursuant to an Indirect Export Order, a Person purchasing the Item pursuant to a
Direct Export Contract) for a military purpose; (e) the Inventory is not to be
incorporated into Items which are destined for shipment to countries in which
the Eximbank is prohibited from doing business (as these countries are
identified in the Country Limitation Schedule); (f) the Inventory is not
destined for shipment to countries in which the Eximbank coverage is not
available for commercial reasons (as those countries are identified in the
Country Limitation Schedule), unless and only to the extent that the Items are
to be sold to such countries on terms of a Letter of Credit in form and
substance satisfactory to the Bank and issued or confirmed by a bank acceptable
to the Bank and the Eximbank; (g) with respect to Inventory incorporated into
Items sold under an Indirect Export Order and which, in turn, are to be
incorporated into goods to be sold under a Direct Export Contract, said goods
shall, in fact, be destined for export by the Buyer thereof; (h) at least fifty
percent (50%) of such Inventory must be of U.S. Content; (i) the Inventory is
not demonstration Inventory or Inventory sold on consignment; (j) the Inventory
is not proprietary software; (k) the Inventory is not damaged, obsolete,
returned, defective, recalled or unfit for further processing; (l) the Inventory
has not been previously exported from the United States; (m) the Inventory does
not constitute defense articles or defense services; or (n) the Inventory is not
to be incorporated into Items whose sale would result in an account receivable
which would not constitute an Eligible Account Receivable. For purposes of
determining the value of Eligible Inventory to be included in the International
Borrowing Base, the value thereof shall be the lower of actual cost or market
value as determined in accordance with GAAP. As used in this definition, "Letter
of Credit" shall mean an irrevocable letter of credit subject to the UCP 500,

                                      -5-

<PAGE>   43


payable in the United States or at the issuing bank and issued for the benefit
of the Borrower on behalf of a Buyer in connection with the purchase of Items.

     "Environmental Laws" shall mean any Governmental Requirement pertaining to
health or the environment, including, but not limited to, CERCLA, the Toxic
Substances Control Act, the Clean Water Act, the Safe Drinking Water Act or the
Clean Air Act, the Resource Conservation and Recovery Act of 1976, the Texas
Water Code, the Texas Solid Waste Disposal Act and the Texas Clean Air Act, each
as amended from time to time.

     "ERISA" shall mean the Employee Retirement Income Security Act of 1974, as
amended from time to time, and all rules, regulations, rulings and
interpretations adopted by the Internal Revenue Service or the U.S. Department
of Labor thereunder.

     "Event of Default" shall mean any of the events specified in Section 10,
provided that there has been satisfied any requirement in connection with such
event for the giving of notice, or the lapse of time, or the happening of any
further condition, event or act.

     "Eximbank" shall mean the Export-Import Bank of the United States.

     "Eximbank Guaranty" shall mean that certain Master Guaranty Agreement No.
TX-MGA-96-004 dated as of June 24, 1996 between the Eximbank and the Bank, as
the same may be amended, modified or supplemented from time to time.

     "Expiration Date" shall mean the last day of an Interest Period.

     "Export Order" shall have the meaning set forth in the Borrower Agreement.

     "Federal Funds Rate" shall mean, for any period, a fluctuating interest
rate per annum equal for each day during such period to the weighted average of
the rates on overnight Federal fund transactions with members of the Federal
Reserve System arranged by Federal funds brokers, as published for such day (or,
if such day is not a Business Day, of the next preceding Business Day) by the
Federal Reserve Bank of New York, or, if such rate is not so published for any
day which is a Business Day, the average of the quotations for such day on such
transactions received by the Bank from three Federal funds brokers of recognized
standing selected by it.

     "GAAP" shall mean Generally Accepted Accounting Principles as defined in
the Borrower Agreement.

     "Governmental Approval" means any authorization, consent, approval, license
or exemption of, registration or filing with, or report or notice to, any
Governmental Authority.

     "Governmental Authority" shall mean any foreign governmental authority, the
United States of America, any State of the United States of America and any
political subdivision of any of the foregoing, and any agency, department,
commission, board, bureau, court or other tribunal having jurisdiction over the
Bank, any Guarantor or the Borrower, or any of their respective assets or
Property.

                                      -6-

<PAGE>   44


     "Governmental Requirement" means any law, statute, code, ordinance, order,
rule, regulation, judgment, decree, injunction, writ, edict, franchise, permit,
certificate, license, award, authorization or other direction, guideline, or
requirement of any Governmental Authority, including, without limitation, any
requirement under common law.

     "Guarantors" shall mean, collectively, NATCO Holdings, Inc., and Cummings
Point Industries, Inc.

     "Highest Lawful Rate" shall mean, with respect to the Bank, the maximum
nonusurious interest rate, if any, that at any time or from time to time may be
contracted for, taken, reserved, charged, or received with respect to the Note
or on other amounts, if any, due to the Bank pursuant to this Agreement or any
other International Loan Document, under laws applicable to the Bank which are
presently in effect, or, to the extent allowed by law, under such applicable
laws which may hereafter be in effect and which allow a higher maximum
nonusurious interest rate than applicable laws now allow.

     "Indebtedness" shall mean, without duplication, (a) all items which, in
accordance with GAAP, would be included on the liability side of a balance sheet
on the date as of which Indebtedness is to be determined (excluding capital
stock, surplus, surplus reserves and deferred credits); (b) all guaranties,
endorsements and other contingent obligations in respect of, or any obligations
to purchase or otherwise acquire, Indebtedness of others; and (c) all
Indebtedness secured by any Lien existing on any interest of the Person with
respect to which indebtedness is being determined in Property owned subject to
such Lien whether or not the Indebtedness secured thereby shall have been
assumed.

     "Indemnified Parties" shall have the meaning set forth in Section 11.15.

     "Indirect Export Order" shall have the meaning set forth in the Borrower
Agreement for the term "Export Order," shall relate to purchase orders and other
contracts pursuant to which Items will be sold to a Buyer who will export the
Items pursuant to a Direct Export Contract, and shall include the purchase
order.

     "Initial Date" shall have the meaning set forth in Section 7.6.

     "Interest Period" shall mean the period of time for which the LIBOR Rate
shall be in effect as to any LIBOR Rate Loan which shall be a 1, 2, 3 or 6 month
period of time, commencing with the Borrowing Date or the Expiration Date of the
immediately preceding Interest Period, as the case may be, applicable to and
ending on the effective date of any rate change or rate continuation made as
provided in Section 2.9 as the Borrower may specify in the Request for Borrowing
or the Notice of Rate Change/Continuation; provided, however, that: (i) any
Interest Period which would otherwise end on a day which is not a Business Day
shall be extended to the next succeeding Business Day unless such Business Day
falls in another calendar month, in which case such Interest Period shall end on
the next preceding Business Day, (ii) the duration of any Interest Period which
commences before any principal repayment installment date and otherwise ends
after such date shall end on such date, (iii) Interest Periods commencing for
Loans comprising part of the same borrowing shall be of the same duration and
(iv) no Interest Period shall extend beyond the Maturity Date.

                                       -7-

<PAGE>   45


     "International Borrowing Base" shall mean (i) an amount equal to the sum of
90% of the Eligible Accounts Receivable of the Borrower which is supported by a
firm Export Order or Indirect Export Order to which no party is in breach of any
material provision thereof, and (ii) 75% of the Eligible Inventory of the
Borrower supported by firm Export Orders or firm Indirect Export Orders.
Notwithstanding anything herein to the contrary, the International Borrowing
Base shall not include the amount of any receivable supported by a letter of
credit prior to the date of shipment of the Items covered by the subject letter
of credit. That is, an account receivable shall not be included in the
International Borrowing Base until shipment of the Items, regardless of when the
letter of credit is in effect.

     "International Borrowing Base Certificate" shall have the meaning set forth
in Section 2.2(b).

     "International Collateral" shall have the meaning set forth in the
International Security Agreement.

     "International Guaranties" shall mean the continuing guaranties dated as of
the Closing Date executed by the Guarantors in favor of the Bank, as may be
amended, modified or supplemented from time to time.

     "International Loan Documents" shall mean this Agreement, the Note, all
International Security Documents, and all instruments, certificates and
agreements now or hereafter executed or delivered to the Bank pursuant to any of
the foregoing and the transactions connected therewith, and all amendments,
modifications, renewals, extensions, increases and rearrangements of, and
substitutions for, any of the foregoing; provided that "International Loan
Documents" shall not include the Domestic Credit Agreement, the Domestic Notes,
the Domestic Security Documents, the Eximbank Guaranty and the Borrower
Agreement.

     "International Obligations" shall mean the Borrower's obligations arising
under this Agreement, the Note and the other International Loan Documents to
repay the Loans and all other indebtedness of the Borrower to the Bank under the
International Loan Documents of any nature and in any amount whatsoever, whether
now or hereafter arising.

     "International Security Agreement" shall mean that certain International
Security Agreement dated as of even date herewith, executed by the Borrower for
the benefit of the Bank, and any and all amendments, modifications, renewals and
extensions thereof.

     "International Security Documents" shall mean this Agreement and the
International Security Agreement, as each may be amended or modified from time
to time.

     "Inventory" shall have the meaning set forth in the Borrower Agreement.

     "Items" shall have the meaning set forth in the Borrower Agreement.

     "Letter of Credit" shall have the meaning provided in Section 2.3(a).

     "Letter of Credit Fee" shall have the meaning specified in Section 4.2.

                                      -8-

<PAGE>   46


     "Letter of Credit Outstandings" shall mean, at any time, the sum of,
without duplication, (a) the aggregate Stated Amount of all outstanding Letters
of Credit and (b) the amount of all Unpaid Drawings in respect of all Letters of
Credit.

     "Letter of Credit Request" shall have the meaning specified in Section
2.4(a).

     "LIBOR Rate" shall mean, for any Interest Period or portion thereof, a rate
per annum (rounded upwards, if necessary, to the nearest 1/16th of 1%) equal to
the LIBOR Rate (Unadjusted) divided by the difference between 1 and the LIBOR
Reserve Percentage on the first day of such Interest Period.

     "LIBOR Rate Loan" shall mean any Loan which bears interest at the LIBOR
Rate.

     "LIBOR Rate (Unadjusted)" shall mean, for each Interest Period, the rate of
interest per annum (rounded upwards, if necessary, to the nearest 1/16th of 1%)
quoted by the Bank at or before 10:00 a.m., (Houston, Texas time) (or as soon
thereafter as practicable), on the date two (2) Business Days prior to the first
day of such Interest Period, for the offering to the Bank by prime banks in the
London LIBOR interbank market, at the time of determination and in accordance
with the then usual practice in such market, of deposits in Dollars for delivery
on the first day of such Interest Period and having a maturity equal to the
length of such Interest Period and in an amount equal (or as nearly equal as
possible) to the LIBOR Rate Loan to which such Interest Period relates. Each
determination by the Bank of the LIBOR Rate shall be conclusive and binding,
absent manifest error, and may be computed using any reasonable averaging and
attribution method.

     "LIBOR Reserve Percentage" shall mean, with respect to any Interest Period
or portion thereof, a percentage (expressed as a decimal) equal to the
percentage in effect on the first day of such Interest Period as prescribed by
the Board for determining the maximum reserve requirements applicable to
"Eurocurrency Liabilities" pursuant to Regulation D or any other applicable
regulation of the Federal Reserve Board (or any successor thereto) which
prescribes reserve requirements applicable to "Eurocurrency Liabilities" as
currently defined in Regulation D.

     "Lien" shall mean any claim, mortgage, deed of trust, pledge, security
interest, encumbrance, lien, or charge of any kind (including, without
limitation, any agreement to give any of the foregoing, any conditional sale or
other title retention agreement or any lease in the nature thereof).

     "Loan" or "Loans" shall mean a loan or loans, respectively, from the Bank
to the Borrower made under Section 2.

     "Material Adverse Effect" shall mean any material adverse effect on (a) the
consolidated financial condition, business, properties, assets, prospects or
operations of the Borrower or any Guarantor, or (b) the ability of the Borrower
or any Guarantor to perform its obligations under this Agreement or any other
International Loan Document to which it is a party on a timely basis.

     "Maturity Date" shall mean June 30, 1998.

     "Monthly Unaudited Financial Statements" shall mean the monthly financial
statements of a Person, which statements shall include a balance sheet as of the
end of such month

                                      -9-

<PAGE>   47


and a statement of operations and retained earnings for such month, and for the
fiscal year to date, subject to normal year-end adjustments, all setting forth
in comparative form the corresponding figures for the corresponding month and
year to date of the preceding year, prepared in accordance with GAAP and
certified as true and correct by the president or chief financial officer of
such Person.

     "Note" shall mean the promissory note of the Borrower, executed and
delivered under this Agreement, as amended from time to time.

     "Notice of Rate Change/Continuation shall have the meaning provided in
Section 2.9(a).

     "Officer's Certificate" shall mean a certificate signed in the name of the
Borrower by either its President, its Chief Financial Officer, any Vice
President or its Secretary.

     "Past Due Rate" shall mean the lower of (a) the Highest Lawful Rate, or (b)
a rate per annum equal to the Prime Rate plus two percent (2%).

     "Permitted Liens" shall mean each of the following: (a) artisans' or
mechanics' Liens arising in the ordinary course of business, and Liens for
taxes, but only to the extent that payment thereof shall not at the time be due
or if due, the payment thereof is being diligently contested in good faith and
adequate reserves computed in accordance with GAAP have been set aside therefor;
(b) Liens in effect on the date of this Agreement and disclosed to the Bank in
Annual Audited Financial Statements delivered on or prior to the date of this
Agreement or in a schedule hereto; (c) normal reservations, exceptions,
encroachments, easements, rights of way, covenants, conditions, restrictions and
encumbrances which do not secure Indebtedness and which do not materially impair
the value or utility of the applicable Property; (d) Liens incurred or deposits
made in the ordinary course of business (1) in connection with workmen's
compensation, unemployment insurance, social security and other like laws, or
(2) to secure insurance in the ordinary course of business, the performance of
bids, tenders, contracts, leases, licenses, statutory obligations, surety,
appeal and performance bonds and other similar obligations incurred in the
ordinary course of business, not, in any of the cases specified in this clause
(2), incurred in connection with the borrowing of money, the obtaining of
advances or the payment of the deferred purchase price of Property; (e)
attachments, judgments and other similar Liens arising in connection with court
proceedings, provided that the execution and enforcement of such Liens are
effectively stayed and the claims secured thereby are being actively contested
in good faith with adequate reserves made therefor in accordance with GAAP; (f)
Liens imposed by law, such as landlords', carriers', warehousemen's, mechanics',
materialmen's and vendors' liens, incurred in good faith in the ordinary course
of business and securing obligations which are not yet due or which are being
contested in good faith by appropriate proceedings if adequate reserves with
respect thereto are maintained in accordance with GAAP; (g) zoning restrictions,
easements, licenses, reservations, provisions, covenants, conditions, waivers,
and restrictions on the use of Property, and which do not in any case singly or
in the aggregate materially impair the present value or utility of the
applicable Property; (h) Liens securing purchase money Indebtedness permitted
under Section 9.6 hereof and covering the Property so purchased; (i) capital
leases and sale/leaseback transactions permitted under the other provisions of
this Agreement, and (j) extensions, renewals and replacements of Liens referred
to in clauses (a) through (i) of this definition; provided that any such
extension, renewal or replacement Lien shall be limited to the

                                      -10-

<PAGE>   48


Property or assets covered by the Lien extended, renewed or replaced and that
the Indebtedness secured by any such extension, renewal or replacement Lien
shall be in an amount not greater than the amount of the Indebtedness secured by
the Lien extended, renewed or replaced.

     "Person" shall mean an individual, partnership, joint venture, corporation,
joint stock company, bank, trust, unincorporated organization and/or a
government or any department or agency thereof.

     "Plan" shall mean any plan subject to Title IV of ERISA or Section 412 of
the Code and maintained at any time since January 1, 1986 for employees of the
Borrower or any Subsidiary thereof or of any member of a "controlled group of
corporations" or "trade or business," as such terms are defined in Section
414(b) or (c) of the Code, of which the Borrower or any Subsidiary thereof is a
member, or any plan subject to Title IV of ERISA or Section 412 of the Code to
which the Borrower or any Subsidiary thereof is required to contribute, or has
been required to contribute at any time since January 1, 1986, on behalf of its
employees.

     "Prime Rate" shall mean the prime rate announced from time to time by the
Bank, and thereafter entered in the minutes of the Bank's Loan and Discount
Committee. Without notice to the Borrower or any other Person, the Prime Rate
shall change automatically from time to time as and in the amount by which said
Prime Rate shall fluctuate, with each such change to be effective as of the date
of each change in such Prime Rate. The Prime Rate is a reference rate and does
not necessarily represent the lowest or best rate actually charged to any
customer. The Bank may make commercial or other loans at rates of interest at,
above or below the Prime Rate.

     "Property" or "Properties" means any interest in any kind of property or
assets, whether real, personal or mixed, and whether tangible or intangible.

     "Request for Borrowing" shall have the meaning set forth in Section 2.1(c).

     "Securities Act" shall have the meaning set forth in Section 11.1.

     "Stated Amount" shall mean, as to each Letter of Credit, at any time, the
maximum amount then available to be drawn thereunder (without regard to whether
any conditions to drawing could then be met).

     "Subordinated Debt" shall mean any Indebtedness subordinated to
Indebtedness due the Bank on terms reasonably satisfactory to the Bank.

     "Subsidiary" means any corporation, joint venture or limited liability
company of which the Borrower or any Subsidiary of the Borrower, either directly
or indirectly, owns at the time more than 50% of the indicia of equity rights
(whether outstanding capital stock or otherwise) of such Person, and shall
include any such Person which shall become a Subsidiary of the Borrower after
the date hereof, and shall further include any partnership of which the Borrower
or any Subsidiary is a general partner thereof and any other entity of which the
Borrower or any Subsidiary shall by virtue of its investment therein incur
liability for the liabilities and obligations thereof.

                                      -11-

<PAGE>   49


     "Tax Dividends" shall mean, for each Subchapter "S" corporation or other
entity which is, without regard to its income, statutorily exempt from the
payment of income tax, dividends with respect to its estimated taxable income.

     "Type" shall mean, with respect to any Loan, any LIBOR Rate Loan or any
Base Rate Loan.

     "Unpaid Drawing" shall have the meaning specified in Section 2.5(a).

     "U.S. Content" shall have the meaning set forth in the Borrower Agreement.
The parties hereto hereby agree that in the event any dispute arises as to the
U.S. Content of any good or service, the decision of the Eximbank shall be final
and conclusive.

                                      -12-

<PAGE>   50


                                   Exhibit "G"

                       NOTICE OF RATE CHANGE/CONTINUATION


TO:  TEXAS COMMERCE BANK NATIONAL ASSOCIATION (the "Bank") pursuant to that
     certain International Revolving Loan Agreement dated as of June 30, 1997
     (as same may be amended, modified, increased, supplemented and/or restated
     from time to time, the "Credit Agreement"), entered into by and between
     National Tank Company (the "Borrower") and the Bank. Unless otherwise
     defined herein, terms defined in the Credit Agreement shall have the same
     meanings in this Notice.

     Pursuant to Section 2.9 of the Credit Agreement, this Notice of Rate
Change/Continuation (the "Notice") represents the Borrower's election to [insert
one or more of the following]:

     [1. Use if converting LIBOR Rate Loans to Base Rate Loans.]

         Convert $_____________ in aggregate principal amount of LIBOR Rate
         Loans with a current Interest Period ending on________, 19__, to Base
         Rate Loans on____________, 19__. [and]

     [1. Use if converting Base Rate Loans to LIBOR Rate Loans.]

         Convert $_____________ in aggregate principal amount of Base Rate Loans
         to LIBOR Rate Loans on _________________, 19__. The initial Interest
         Period for such LIBOR Rate Loans is requested to be a [one] [two]
         [three] [six] (_____) month period.

     [1. Use if continuing LIBOR Rate Loans.]

         Continue $__________ in aggregate principal amount of LIBOR Rate Loans
         with a current Interest Period ending on _____________, 19___. The
         initial Interest Period for such LIBOR Rate Loans is requested to be a
         [one] [two] [three] [six] (__) month period.

     2. Borrower hereby certifies that no Default or Event of Default has
        occurred and is continuing under the Credit Agreement.

     3. As of the date hereof, and as a result of the making of the requested
        Loans, there does not and will not exist any Default or Event of
        Default.

     4. The representations and warranties contained in the Loan Documents
        (other than those by their terms limited to a specific date) are true
        and correct in all material respects as of the date hereof and shall be
        true and correct upon the making of the requested Loans, with the same
        force and effect as though made on and as of the date hereof and
        thereof.

                                       -1-

<PAGE>   51


     5. No event has occurred since the date of the most recent financial
        statements provided to the Bank dated as of ________, 19__ that has
        caused a Material Adverse Effect.


        Dated:   __________, 19___.


                                       NATIONAL TANK COMPANY


                                       By:
                                           -------------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                              ----------------------------------


                                       -2-
<PAGE>   52
           FIRST AMENDMENT TO INTERNATIONAL REVOLVING LOAN AGREEMENT

THIS FIRST AMENDMENT TO INTERNATIONAL REVOLVING LOAN AGREEMENT ("Amendment" or
"First Amendment") dated as of August 8, 1997 ("Effective Date") is between
NATIONAL TANK COMPANY, a Delaware corporation ("Borrower") and Texas Commerce
Bank National Association, a national banking association (together with its
successors and assigns, "Bank").

PRELIMINARY STATEMENT. Borrower and Bank are parties to that certain
International Revolving Loan Agreement dated as of June 30, 1997 (as amended,
"Loan Agreement" or "Agreement"). Each capitalized term defined in the Loan
Agreement and not otherwise defined in this Amendment shall have the same
meaning herein as in the Loan Agreement, and each Section and Exhibit reference
is to the Loan Agreement as amended. Borrower and Bank have agreed to increase
the face amount of the Commitment.

NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants herein set forth and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Borrower and Bank
hereby agree as follows:

1. Section 2.1(a)(i) of the Loan Agreement is amended by inserting
"$5,000,000.00" in place of "$3,000,000.00" where the latter appears.

2. Borrower irrevocably agrees to pay to Bank a facility fee of $17,918.00, in
respect of the increase in the amount of the Commitment evidenced by this
Amendment (inclusive of amounts due to Exim Bank in respect of the transactions
contemplated by this Amendment), in addition to all other fees and other
amounts payable in the International Loan Documents. In no event shall such
amount be refunded to Borrower, whether or not the transactions contemplated
hereby are consummated.

3. The Loan Agreement is amended by replacing the existing "Exhibit B" with the
new "Exhibit B" attached to this Amendment.

4. By its execution and delivery hereof, Borrower represents and warrants the
following:

         (a) As of the date hereof and after giving effect to the amendments
         contemplated herein, (i) the representations and warranties contained
         in Section 6 of the International Loan Agreement, as amended by this
         Amendment, and the other International Loan Documents, are true and
         correct on and as of the date hereof as though made by Borrower on and
         as of such date (except to the extent that such representations and
         warranties relate solely to an earlier date) and (ii) no Event of
         Default or other event which with the passage of time or the giving of
         notice or both would constitute an Event of Default has occurred and
         is continuing; and

         (b) The execution and delivery of this Amendment shall in no way
         release, diminish, impair, reduce or otherwise adversely affect the
         obligations of Borrower under the International Loan Agreement, as
         amended by this Amendment, the Note or any other International Loan
         Document, as each of the foregoing documents and instruments may be
         further amended or otherwise modified from time to time.

5. This Amendment shall become effective when and only when (a) Bank shall have
received acknowledgment from the Eximbank, which acknowledgment is satisfactory
to Bank, that the Eximbank Guaranty remains in full force and effect
notwithstanding this Amendment and covers the Commitment in the amount
established by this Amendment, (b) Bank shall have executed a counterpart of
this Amendment and (c) Bank shall have received each of the following:

         (i) Counterparts of this Amendment executed by Borrower;

         (ii) An amended and restated International Revolving Note in the form
         of Exhibit B executed by Borrower;

         (iii) Such other documents and agreements as Bank may reasonably
         request, including without limitation, a new Loan Authorization Notice
         and new form of Borrower Agreement; and

         (iv) The facility fee agreed to in section 2 of this Amendment.

6. Borrower hereby ratifies (i) the International Loan Agreement, as amended by
this Amendment, (ii) the Note and (iii) the other International Loan Documents
to which Borrower is a party, and confirms that and of the rights and powers
created under each of the foregoing documents and instruments shall be and
remain in full force and effect.

7. The execution, delivery and effectiveness of this Amendment shall not
operate as a waiver of any right, power or remedy of Bank under the
International Loan Agreement, as amended by this Amendment, or under the Note
or the other International Loan Documents, as each may be amended or modified
from time to time, nor constitute a waiver of any other provision of the
foregoing documents and instruments, as each may be amended or modified from
time to time. Borrower agrees to do, execute, acknowledge and deliver all and
every such further acts and instruments as Bank may request for the better
assuring and confirming unto Bank all and singular the rights granted or
intended to be granted hereby or hereunder. This Amendment may be executed in
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed to
be an original and all of which taken together shall constitute but one and the
same instrument.

8. Pursuant to Section 11.3 of the International Loan Agreement, Borrower
agrees to pay on demand all costs and expenses of Bank in connection with the
preparation, reproduction, execution and delivery of this Amendment and the
other instruments and documents to be delivered hereunder (including, without
limitation, the reasonable fees and out-of-pocket expenses of course for Bank
with respect thereto and with respect to advising Bank as to its rights and
responsibilities under the International Loan Agreement, as hereby amended).

THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF TEXAS AND SHALL BE BINDING UPON BORROWER, BANK AND THEIR
SUCCESSORS AND ASSIGNS.

THIS WRITTEN AMENDMENT AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT THE
FINAL AGREEMENT BETWEEN THE PARTIES RESPECTING THE SUBJECT MATTER HEREOF AND
MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT
ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN
THE PARTIES.

IN WITNESS WHEREOF, the parties hereto, by their officers thereunto duly
authorized, have executed this Amendment as of the day and year first above
written.

<TABLE>
<CAPTION>
BORROWER: NATIONAL TANK COMPANY                               BANK: TEXAS COMMERCE BANK NATIONAL ASSOCIATION

<S>                                                           <C>
                                                              By: /s/ MONA M. FOCH
                                                                 -------------------------------------------
By: /s/ WILLIAM B. WIENER, III
   --------------------------------------                     Name:   Mona M. Foch
                                                                   -----------------------------------------
Name:   William B. Wiener, III
     ------------------------------------                     Title:  Vice President
                                                                    ----------------------------------------
Title:  Senior Vice President
      -----------------------------------                     By: /s/ WILLIAM McCOLLUM
                                                                 -------------------------------------------

                                                              Name:   William McCollum
                                                                   -----------------------------------------

                                                              Title:  International Banking Officer
                                                                    ----------------------------------------

</TABLE>

                                    Page 1

<PAGE>   53


                                  EXHIBIT "B"

            FIRST AMENDED AND RESTATED INTERNATIONAL REVOLVING NOTE

$5,000,000.00                                                    August 8, 1997

FOR VALUE RECEIVED, the undersigned, NATIONAL TANK COMPANY, a corporation
organized under the laws of the State of Delaware ("Borrower"), HEREBY PROMISES
TO PAY to the order of TEXAS COMMERCE BANK NATIONAL ASSOCIATION, a national
banking association ("Bank"), on or before June 30, 1998 ("Maturity Date"), the
principal sum of Five Million and 00/100 Dollars ($5,000,000.00), or, if less,
the aggregate principal amount of Loans outstanding on the Maturity Date, in
accordance with the terms and provisions of that certain International
Revolving Loan Agreement dated as of June 30, 1997 by and among Borrower and
Bank (as amended from time to time, the "International Loan Agreement";
capitalized terms used herein and not otherwise defined herein shall have the
meanings ascribed to such terms in the International Loan Agreement).

The outstanding principal balance of this Note shall be due and payable as
provided in the International Loan Agreement. Borrower promises to pay interest
on the unpaid principal balance of this Note from the date of any Loan
evidenced by this Note until the principal balance thereof is paid in full
Interest shall accrue on the outstanding principal balance of this Note from
and including the date of any Loan evidenced by this Note to but not including
the Maturity Date at the rate or rates, and shall be due and payable on the
dates, set forth in the International Loan Agreement. Any amount not paid when
due with respect to principal (whether at stated maturity, by acceleration or
otherwise), costs or expenses, or, to the extent permitted by applicable law,
interest, shall bear interest from the date when due to and excluding the date
the same is paid in full payable on demand, at the Past Due Rate.

Payments of principal and interest, and all amounts due with respect to costs
and expenses, shall be made in lawful money of the United States of America in
immediately available funds, without deduction, set-off or counterclaim to
Bank, or such other location as may be notified to Borrower by Bank, not later
than 12:00 noon (Houston Time) on the dates on which such payments shall become
due pursuant to the terms and provisions set forth in the International Loan
Agreement.

If any payment of principal or interest on this Note shall become due on a
Saturday, Sunday, or public holiday on which Bank is not open for business,
such payment shall be made on the next succeeding Business Day and such
extension of time shall in such case be included in computing interest in
connection with such payment.

All loans and advances and all payments and prepayments made hereon shall be
recorded in the holder's records and such records shall be controlling.

In addition to all principal and accrued interest on this Note, Borrower agrees
to pay (a) all reasonable costs and expenses incurred by all owners and holders
of this Note in collecting this Note through any probate, reorganization, or
any other proceeding and (b) reasonable attorneys' fees when and if this Note
is placed in the hands of an attorney for collection after default.

All agreements among Borrower and Bank whether now existing or hereafter
arising and whether written or oral, are hereby expressly limited so that in no
contingency or event whatsoever, whether by reason of demand being made on this
Note or otherwise, shall the amount paid, or agreed to be paid, to Bank for the
use, forbearance, or detention of the money to be loaned under the
International Loan Agreement and evidenced by this Note or otherwise or for the
payment or performance of any covenant or obligation contained in the
International Loan Agreement, this Note or in any other International Loan
Document exceed the Highest Lawful Rate. If, as a result of any circumstances
whatsoever, fulfillment of any provision hereof or of any of such documents, at
the time performance of such provision shall be due, shall involve transcending
the limit of validity prescribed by applicable usury law, then, ipso facto, the
obligation to be fulfilled shall be reduced to the limit of such validity, and
if, from any such circumstance, Bank shall ever receive interest or anything
which might be deemed interest under applicable law which would exceed the
Highest Lawful Rate, such amount which would be excessive interest shall be
applied to the reduction of the principal amount owing on account of this Note
or the amounts owing on other obligations of Borrower to Bank under any
International Loan Document and not to the payment of interest, or if such
excessive interest exceeds the unpaid principal balance of this Note and the
amounts owing on other obligations of Borrower to Bank under any International
Loan Documents, as the case may be, such excess shall be refunded to Borrower.
All sums paid or agreed to be paid to Bank for the use, forbearance, or
detention of the indebtedness of Borrower to Bank shall, to the extent
permitted by applicable law, be amortized, prorated, allocated, and spread
throughout the full term of such indebtedness until payment in full of the
principal thereof (including the period of any renewal or extension thereof) so
that the interest on account of such indebtedness shall not exceed the Highest
Lawful

                                    Page 1


<PAGE>   54

Rate. Notwithstanding anything to the contrary contained in the International
Loan Agreement or this Note, it is understood and agreed that if at any time
the rate of interest which accrues on the outstanding principal balance of this
Note shall exceed the Highest Lawful Rate, the rate of interest which accrues
on the outstanding principal balance of this Note shall be limited to the
Highest Lawful Rate, but any subsequent reductions in the rate of interest
which accrues on the outstanding principal balance of this Note shall not
reduce the rate of interest which accrues on the outstanding principal balance
of this Note below the Highest Lawful Rate until the total amount of interest
accrued on the outstanding principal balance of this Note equals the amount of
interest which would have accrued if such interest rate had at all times been
in effect. The terms and provisions of this paragraph shall control and
supersede every other provision of all agreements among Borrower and Bank. This
Note is entitled to the benefits of the International Loan Agreement, which
International Loan Agreement, among other things, contains provisions for
acceleration of the maturity hereof upon the happening of certain stated
events, for prepayments on account of principal hereof prior to the maturity
hereof upon the terms and conditions and with the effect therein specified, and
provisions to the effect that no provision of the International Loan Agreement
or this Note shall require the payment or permit the collection of interest in
excess of the Highest Lawful! Rate. The obligations of Borrower hereunder are
secured by the International Security Documents. It is contemplated that by
reason of prepayments or repayments hereon prior to the Maturity Date, there
may be times when no indebtedness is owing hereunder prior to such date, but
notwithstanding such occurrences, this Note shall remain valid and shall be in
full force and effect as to Loans made pursuant to the International Loan
Agreement subsequent to each such occurrence.

Except as otherwise specifically provided for in the International Loan
Agreement, Borrower and any and all endorsers, guarantors and sureties
severally waive grace, demand, presentment for payment, notice of dishonor or
default, protest, notice of protest, notice of intent to accelerate, notice of
acceleration and diligence in collecting and bringing of suit against any party
hereto, and agree to all renewals, extensions or partial payments hereon, with
or without notice, before or after maturity.

This Note is the Note referred to in the International Loan Agreement and is
given in amendment, restatement, replacement and increase, but not in
extinguishment, of the International Revolving Note dated June 30, 1997 in the
original principal amount of $3,000,000 made by Borrower and payable to the
order of Bank.

THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF
THE STATE OF TEXAS AND APPLICABLE FEDERAL LAW.

THIS NOTE AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT THE FINAL
AGREEMENT AMONG THE PARTIES AS TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES; AND THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE
PARTIES.

IN WITNESS WHEREOF Borrower has caused this Note to be executed and delivered
by its officer thereunto duly authorized effective as of the date first above
written.



NATIONAL TANK COMPANY

By:
   ----------------------------------------
Name:
     --------------------------------------
Title:
      -------------------------------------

                                    Page 2

<PAGE>   55




            FIRST AMENDED AND RESTATED INTERNATIONAL REVOLVING NOTE

$5,000,000.00                                                    August 8, 1997

FOR VALUE RECEIVED, the undersigned, NATIONAL TANK COMPANY, a corporation
organized under the laws of the State of Delaware ("Borrower"), HEREBY PROMISES
TO PAY to the order of TEXAS COMMERCE BANK NATIONAL ASSOCIATION, a national
banking association ("Bank"), on or before June 30, 1998 ("Maturity Date"), the
principal sum of Five Million and 00/100 Dollars ($5,000,000.00), or, if less,
the aggregate principal amount of Loans outstanding on the Maturity Date, in
accordance with the terms and provisions of that certain International
Revolving Loan Agreement dated as of June 30, 1997 by and among Borrower and
Bank (as amended from time to time, the "International Loan Agreement";
capitalized terms used herein and not otherwise defined herein shall have the
meanings ascribed to such terms in the International Loan Agreement).

The outstanding principal balance of this Note shall be due and payable as
provided in the International Loan Agreement. Borrower promises to pay interest
on the unpaid principal balance of this Note from the date of any Loan
evidenced by this Note until the principal balance thereof is paid in full
Interest shall accrue on the outstanding principal balance of this Note from
and including the date of any Loan evidenced by this Note to but not including
the Maturity Date at the rate or rates, and shall be due and payable on the
dates, set forth in the International Loan Agreement. Any amount not paid when
due with respect to principal (whether at stated maturity, by acceleration or
otherwise), costs or expenses, or, to the extent permitted by applicable law,
interest, shall bear interest from the date when due to and excluding the date
the same is paid in full payable on demand, at the Past Due Rate.

Payments of principal and interest, and all amounts due with respect to costs
and expenses, shall be made in lawful money of the United States of America in
immediately available funds, without deduction, set-off or counterclaim to
Bank, or such other location as may be notified to Borrower by Bank, not later
than 12:00 noon (Houston Time) on the dates on which such payments shall become
due pursuant to the terms and provisions set forth in the International Loan
Agreement.

If any payment of principal or interest on this Note shall become due on a
Saturday, Sunday, or public holiday on which Bank is not open for business,
such payment shall be made on the next succeeding Business Day and such
extension of time shall in such case be included in computing interest in
connection with such payment.

All loans and advances and all payments and prepayments made hereon shall be
recorded in the holder's records and such records shall be controlling.

In addition to all principal and accrued interest on this Note, Borrower agrees
to pay (a) all reasonable costs and expenses incurred by all owners and holders
of this Note in collecting this Note through any probate, reorganization, or
any other proceeding and (b) reasonable attorneys' fees when and if this Note
is placed in the hands of an attorney for collection after default.

All agreements among Borrower and Bank whether now existing or hereafter
arising and whether written or oral, are hereby expressly limited so that in no
contingency or event whatsoever, whether by reason of demand being made on this
Note or otherwise, shall the amount paid, or agreed to be paid, to Bank for the
use, forbearance, or detention of the money to be loaned under the
International Loan Agreement and evidenced by this Note or otherwise or for the
payment or performance of any covenant or obligation contained in the
International Loan Agreement, this Note or in any other International Loan
Document exceed the Highest Lawful Rate. If, as a result of any circumstances
whatsoever, fulfillment of any provision hereof or of any of such documents, at
the time performance of such provision shall be due, shall involve transcending
the limit of validity prescribed by applicable usury law, then, ipso facto, the
obligation to be fulfilled shall be reduced to the limit of such validity, and
if, from any such circumstance, Bank shall ever receive interest or anything
which might be deemed interest under applicable law which would exceed the
Highest Lawful Rate, such amount which would be excessive interest shall be
applied to the reduction of the principal amount owing on account of this Note
or the amounts owing on other obligations of Borrower to Bank under any
International Loan Document and not to the payment of interest, or if such
excessive interest exceeds the unpaid principal balance of this Note and the
amounts owing on other obligations of Borrower to Bank under any International
Loan Documents, as the case may be, such excess shall be refunded to Borrower.
All sums paid or agreed to be paid to Bank for the use, forbearance, or
detention of the indebtedness of Borrower to Bank shall, to the extent
permitted by applicable law, be amortized, prorated, allocated, and spread
throughout the full term of such indebtedness until payment in full of the
principal thereof (including the period of any renewal or extension thereof) so
that the interest on account of such indebtedness shall not exceed the Highest
Lawful Rate. Notwithstanding anything to the contrary contained in the
International Loan Agreement or this Note, it is

                                    Page 1


<PAGE>   56

understood and agreed that if at any time the rate of interest which accrues on
the outstanding principal balance of this Note shall exceed the Highest Lawful
Rate, the rate of interest which accrues on the outstanding principal balance
of this Note shall be limited to the Highest Lawful Rate, but any subsequent
reductions in the rate of interest which accrues on the outstanding principal
balance of this Note shall not reduce the rate of interest which accrues on the
outstanding principal balance of this Note below the Highest Lawful Rate until
the total amount of interest accrued on the outstanding principal balance of
this Note equals the amount of interest which would have accrued if such
interest rate had at all times been in effect. The terms and provisions of this
paragraph shall control and supersede every other provision of all agreements
among Borrower and Bank. This Note is entitled to the benefits of the
International Loan Agreement, which International Loan Agreement, among other
things, contains provisions for acceleration of the maturity hereof upon the
happening of certain stated events, for prepayments on account of principal
hereof prior to the maturity hereof upon the terms and conditions and with the
effect therein specified, and provisions to the effect that no provision of the
International Loan Agreement or this Note shall require the payment or permit
the collection of interest in excess of the Highest Lawful! Rate. The
obligations of Borrower hereunder are secured by the International Security
Documents. It is contemplated that by reason of prepayments or repayments
hereon prior to the Maturity Date, there may be times when no indebtedness is
owing hereunder prior to such date, but notwithstanding such occurrences, this
Note shall remain valid and shall be in full force and effect as to Loans made
pursuant to the International Loan Agreement subsequent to each such
occurrence.

Except as otherwise specifically provided for in the International Loan
Agreement, Borrower and any and all endorsers, guarantors and sureties
severally waive grace, demand, presentment for payment, notice of dishonor or
default, protest, notice of protest, notice of intent to accelerate, notice of
acceleration and diligence in collecting and bringing of suit against any party
hereto, and agree to all renewals, extensions or partial payments hereon, with
or without notice, before or after maturity.

This Note is the Note referred to in the International Loan Agreement and is
given in amendment, restatement, replacement and increase, but not in
extinguishment, of the International Revolving Note dated June 30, 1997 in the
original principal amount of $3,000,000 made by Borrower and payable to the
order of Bank.

THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF
THE STATE OF TEXAS AND APPLICABLE FEDERAL LAW.

THIS NOTE AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT THE FINAL
AGREEMENT AMONG THE PARTIES AS TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES; AND THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE
PARTIES.

IN WITNESS WHEREOF Borrower has caused this Note to be executed and delivered
by its officer thereunto duly authorized effective as of the date first above
written.



NATIONAL TANK COMPANY

By:
   ----------------------------------
Name:
     --------------------------------
Title:
      -------------------------------


                                    Page 2
<PAGE>   57

           SECOND AMENDMENT TO INTERNATIONAL REVOLVING LOAN AGREEMENT

THIS SECOND AMENDMENT TO INTERNATIONAL REVOLVING LOAN AGREEMENT (this
"Amendment" or "Second Amendment") dated as of June 30, 1998 ("Effective Date")
is between NATIONAL TANK COMPANY, a Delaware corporation ("Borrower") and Chase
Bank of Texas, National Association, a national banking association, formerly
Texas Commerce Bank National Association (together with its successors and
assigns, "Bank").

PRELIMINARY STATEMENT. Borrower and Bank are parties to that certain
International Revolving Loan Agreement dated as of June 30, 1997, amended by a
First Amendment dated August 8, 1997 (as amended, "Loan Agreement" or
"Agreement"). Each capitalized term defined in the Loan Agreement and not
otherwise defined in this Amendment shall have the same meaning herein as in the
Loan Agreement, and each Section and Exhibit reference is to the Loan Agreement
as amended. Borrower and Bank have agreed to a short term extension of the
Commitment as provided further herein.

NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants herein set forth and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Borrower and Bank
hereby agree as follows:

1. Borrower irrevocably agrees to pay to Bank a facility fee of $8,333.00, in
respect of the extension of the Commitment evidenced by this Amendment
(inclusive of amounts due to Exim Bank in respect of the transactions
contemplated by this Amendment), in addition to all other fees and other amounts
payable in the International Loan Documents. In no event shall such amount be
refunded to Borrower, whether or not the transactions contemplated hereby are
consummated.

2. The Loan Agreement is amended by replacing the existing "Exhibit B" with the
new "Exhibit B" attached to this Amendment.

3. By its execution and delivery hereof, Borrower represents and warrants the
following:

         (a) As of the date hereof and after giving effect to the amendments
         contemplated herein, (i) the representations and warranties contained
         in Section 6 of the International Loan Agreement, as amended by this
         Amendment, and the other International Loan Documents, are true and
         correct on and as of the date hereof as though made by Borrower on and
         as of such date (except to the extent that such representations and
         warranties relate solely to an earlier date) and (ii) no Event of
         Default or other event which with the passage of time or the giving of
         notice or both would constitute an Event of Default has occurred and is
         continuing; and
         (b) The execution and delivery of this Amendment shall in no way
         release, diminish, impair, reduce or otherwise adversely affect the
         obligations of Borrower under the International Loan Agreement, as
         amended by this Amendment, the Note or any other International Loan
         Document, as each of the foregoing documents and instruments may be
         further amended or otherwise modified from time to time.

4. This Amendment shall become effective when and only when (a) Bank shall have
received acknowledgment from the Eximbank, which acknowledgment is satisfactory
to Bank, that the Eximbank Guaranty remains in full force and effect
notwithstanding this Amendment and covers the Commitment in the amount
established by this Amendment, (b) Bank shall have executed a counterpart of
this Amendment and (c) Bank shall have received each of the following:
         (i) Counterparts of this Amendment executed by Borrower;
         (ii) An amended and restated International Revolving Note in the form
         of Exhibit B executed by Borrower;
         (iii) Such other documents and agreements as Bank may reasonably
         request, including without limitation, a new Loan Authorization Notice
         and new form of Borrower Agreement; and
         (iv) The facility fee agreed to in section 1 of this Amendment.

5. Borrower hereby ratifies (i) the International Loan Agreement, as amended by
this Amendment, (ii) the Note and (iii) the other International Loan Documents
to which Borrower is a party, and confirms that and of the rights and powers
created under each of the foregoing documents and instruments shall be and
remain in full force and effect.

6. The execution, delivery and effectiveness of this Amendment shall not operate
as a waiver of any right, power or remedy of Bank under the International Loan
Agreement, as amended by this Amendment, or under the Note or the other
International Loan Documents, as each may be amended or modified from time to
time, nor constitute a waiver of any other provision of the foregoing documents
and instruments, as each may be amended or modified from time to time. Borrower
agrees to do, execute, acknowledge and deliver all and every such further acts
and instruments as Bank may request for the better assuring and confirming unto
Bank all and singular the rights granted or intended to be granted hereby or
hereunder. This Amendment may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed and delivered shall be deemed to be an original and all of which taken
together shall constitute but one and the same instrument.

7. Pursuant to Section 11.3 of the International Loan Agreement, Borrower agrees
to pay on demand all costs and expenses of Bank in connection with the
preparation, reproduction, execution and delivery of this Amendment and the
other instruments and documents to be delivered hereunder (including, without
limitation, the reasonable fees and out-of-pocket expenses of course for Bank
with respect thereto and with respect to advising Bank as to its rights and
responsibilities under the International Loan Agreement, as hereby amended).

THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF TEXAS AND SHALL BE BINDING UPON BORROWER, BANK AND THEIR SUCCESSORS
AND ASSIGNS.

THIS WRITTEN AMENDMENT AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT THE
FINAL AGREEMENT BETWEEN THE PARTIES RESPECTING THE SUBJECT MATTER HEREOF AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

IN WITNESS WHEREOF, the parties hereto, by their officers thereunto duly
authorized, have executed this Amendment as of the day and year first above
written.

BORROWER: NATIONAL TANK COMPANY         BANK: CHASE BANK OF TEXAS, NATIONAL
                                              ASSOCIATION

                                        By:
By:   /s/ WILLIAM B. WIENER, III              ---------------------------------
      --------------------------        Name:
Name:     William B. Wiener, III              ---------------------------------
      --------------------------        Title:
Title:    Senior Vice President               ---------------------------------
      --------------------------


                                        By:
                                              ---------------------------------
                                        Name:
                                              ---------------------------------
                                        Title:
                                              ---------------------------------


                                     Page 1
<PAGE>   58

                                   EXHIBIT "B"

             FIRST AMENDED AND RESTATED INTERNATIONAL REVOLVING NOTE

$5,000,000.00                                                     June 30, 1998

FOR VALUE RECEIVED, the undersigned, NATIONAL TANK COMPANY, a corporation
organized under the laws of the State of Delaware ("Borrower"), HEREBY PROMISES
TO PAY to the order of CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, a national
banking association ("Bank," formerly Texas Commerce Bank National Association),
on or before August 31, 1998 ("Maturity Date"), the principal sum of Five
Million and 00/100 Dollars ($5,000,000.00), or, if less, the aggregate principal
amount of Loans outstanding on the Maturity Date, in accordance with the terms
and provisions of that certain International Revolving Loan Agreement dated as
of June 30, 1997 by and among Borrower and Bank (as amended from time to time,
the "International Loan Agreement"; capitalized terms used herein and not
otherwise defined herein shall have the meanings ascribed to such terms in the
International Loan Agreement).

The outstanding principal balance of this Note shall be due and payable as
provided in the International Loan Agreement. Borrower promises to pay interest
on the unpaid principal balance of this Note from the date of any Loan evidenced
by this Note until the principal balance thereof is paid in full Interest shall
accrue on the outstanding principal balance of this Note from and including the
date of any Loan evidenced by this Note to but not including the Maturity Date
at the rate or rates, and shall be due and payable on the dates, set forth in
the International Loan Agreement. Any amount not paid when due with respect to
principal (whether at stated maturity, by acceleration or otherwise), costs or
expenses, or, to the extent permitted by applicable law, interest, shall bear
interest from the date when due to and excluding the date the same is paid in
full payable on demand, at the Past Due Rate.

Payments of principal and interest, and all amounts due with respect to costs
and expenses, shall be made in lawful money of the United States of America in
immediately available funds, without deduction, set-off or counterclaim to Bank,
or such other location as may be notified to Borrower by Bank, not later than
12:00 noon (Houston Time) on the dates on which such payments shall become due
pursuant to the terms and provisions set forth in the International Loan
Agreement.

If any payment of principal or interest on this Note shall become due on a
Saturday, Sunday, or public holiday on which Bank is not open for business, such
payment shall be made on the next succeeding Business Day and such extension of
time shall in such case be included in computing interest in connection with
such payment.

All loans and advances and all payments and prepayments made hereon shall be
recorded in the holder's records and such records shall be controlling.

In addition to all principal and accrued interest on this Note, Borrower agrees
to pay (a) all reasonable costs and expenses incurred by all owners and holders
of this Note in collecting this Note through any probate, reorganization, or any
other proceeding and (b) reasonable attorneys' fees when and if this Note is
placed in the hands of an attorney for collection after default.

All agreements among Borrower and Bank whether now existing or hereafter arising
and whether written or oral, are hereby expressly limited so that in no
contingency or event whatsoever, whether by reason of demand being made on this
Note or otherwise, shall the amount paid, or agreed to be paid, to Bank for the
use, forbearance, or detention of the money to be loaned under the International
Loan Agreement and evidenced by this Note or otherwise or for the payment or
performance of any covenant or obligation contained in the International Loan
Agreement, this Note or in any other International Loan Document exceed the
Highest Lawful Rate. If, as a result of any circumstances whatsoever,
fulfillment of any provision hereof or of any of such documents, at the time
performance of such provision shall be due, shall involve transcending the limit
of validity prescribed by applicable usury law, then, ipso facto, the obligation
to be fulfilled shall be reduced to the limit of such validity, and if, from any
such circumstance, Bank shall ever receive interest or anything which might be
deemed interest under applicable law which would exceed the Highest Lawful Rate,
such amount which would be excessive interest shall be applied to the reduction
of the principal amount owing on account of this Note or the amounts owing on
other obligations of Borrower to Bank under any International Loan Document and
not to the payment of interest, or if such excessive interest exceeds the unpaid
principal balance of this Note and the amounts owing on other obligations of
Borrower to Bank under any International Loan Documents, as the case may be,
such excess shall be refunded to Borrower. All sums paid or agreed to be paid to
Bank for the use, forbearance, or detention of the indebtedness of Borrower to
Bank shall, to the extent permitted by applicable law, be amortized, prorated,
allocated, and spread throughout the full term of such indebtedness until
payment in full of the principal thereof (including the period of any renewal or
extension thereof) so that the interest on account of such indebtedness shall
not exceed the Highest Lawful


                                     Page 1

<PAGE>   59


Rate. Notwithstanding anything to the contrary contained in the International
Loan Agreement or this Note, it is understood and agreed that if at any time the
rate of interest which accrues on the outstanding principal balance of this Note
shall exceed the Highest Lawful Rate, the rate of interest which accrues on the
outstanding principal balance of this Note shall be limited to the Highest
Lawful Rate, but any subsequent reductions in the rate of interest which accrues
on the outstanding principal balance of this Note shall not reduce the rate of
interest which accrues on the outstanding principal balance of this Note below
the Highest Lawful Rate until the total amount of interest accrued on the
outstanding principal balance of this Note equals the amount of interest which
would have accrued if such interest rate had at all times been in effect. The
terms and provisions of this paragraph shall control and supersede every other
provision of all agreements among Borrower and Bank. This Note is entitled to
the benefits of the International Loan Agreement, which International Loan
Agreement, among other things, contains provisions for acceleration of the
maturity hereof upon the happening of certain stated events, for prepayments on
account of principal hereof prior to the maturity hereof upon the terms and
conditions and with the effect therein specified, and provisions to the effect
that no provision of the International Loan Agreement or this Note shall require
the payment or permit the collection of interest in excess of the Highest
Lawful! Rate. The obligations of Borrower hereunder are secured by the
International Security Documents. It is contemplated that by reason of
prepayments or repayments hereon prior to the Maturity Date, there may be times
when no indebtedness is owing hereunder prior to such date, but notwithstanding
such occurrences, this Note shall remain valid and shall be in full force and
effect as to Loans made pursuant to the International Loan Agreement subsequent
to each such occurrence.

Except as otherwise specifically provided for in the International Loan
Agreement, Borrower and any and all endorsers, guarantors and sureties severally
waive grace, demand, presentment for payment, notice of dishonor or default,
protest, notice of protest, notice of intent to accelerate, notice of
acceleration and diligence in collecting and bringing of suit against any party
hereto, and agree to all renewals, extensions or partial payments hereon, with
or without notice, before or after maturity.

This Note is the Note referred to in the International Loan Agreement and is
given in amendment, restatement and replacement, but not in extinguishment, of
the International Revolving Note dated August 8, 1997 in the original principal
amount of $5,000,000 made by Borrower and payable to the order of Bank.

THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF
THE STATE OF TEXAS AND APPLICABLE FEDERAL LAW.

THIS NOTE AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT THE FINAL
AGREEMENT AMONG THE PARTIES AS TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES; AND THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE
PARTIES.

IN WITNESS WHEREOF Borrower has caused this Note to be executed and delivered by
its officer thereunto duly authorized effective as of the date first above
written.



NATIONAL TANK COMPANY

By: /s/ WILLIAM B. WIENER, III
   --------------------------------------
Name:   William B. Wiener, III
     ------------------------------------
Title:  Senior Vice President
      -----------------------------------


                                     Page 2
<PAGE>   60
                                                                   EXHIBIT 10.23



            THIRD AMENDMENT TO INTERNATIONAL REVOLVING LOAN AGREEMENT

THIS THIRD AMENDMENT TO INTERNATIONAL REVOLVING LOAN AGREEMENT (this "Amendment"
or "Third Amendment") dated as of August 31, 1998 ("Effective Date") is between
NATIONAL TANK COMPANY, a Delaware corporation ("Borrower") and Chase Bank of
Texas, National Association, a national banking association, formerly Texas
Commerce Bank National Association (together with its successors and assigns,
"Bank").

PRELIMINARY STATEMENT. Borrower and Bank are parties to that certain
International Revolving Loan Agreement dated as of June 30, 1997, amended by a
First Amendment dated August 8, 1997 and a Second Amendment dated June 30, 1998
(as amended, "Loan Agreement" or "Agreement"). Each capitalized term defined in
the Loan Agreement and not otherwise defined in this Amendment shall have the
same meaning herein as in the Loan Agreement, and each Section and Exhibit
reference is to the Loan Agreement as amended. Borrower and Bank have agreed to
a renew the Commitment as provided further herein.

NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants herein set forth and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Borrower and Bank
hereby agree as follows:

1. The definition of "Maturity Date" in Exhibit A is amended to read: "`Maturity
Date' shall mean August 31, 1999."

2. Borrower irrevocably agrees to pay to Bank a facility fee of $50,000.00, in
respect of the renewal of the Commitment evidenced by this Amendment (inclusive
of amounts due to Exim Bank in respect of the transactions contemplated by this
Amendment), in addition to all other fees and other amounts payable in the
International Loan Documents. In no event shall such amount be refunded to
Borrower, whether or not the transactions contemplated hereby are consummated.

3. The Loan Agreement is amended by replacing the existing "Exhibit B" with the
new "Exhibit B" attached to this Amendment. "Note" shall refer to the note
executed in connection herewith substantially in the form of Exhibit B, and all
extensions, renewals, replacements and other rearrangements.

4. By its execution and delivery hereof, Borrower represents and warrants the
following:

         (a) As of the date hereof and after giving effect to the amendments
         contemplated herein, (i) the representations and warranties contained
         in Section 6 of the International Loan Agreement, as amended by this
         Amendment, and the other International Loan Documents, are true and
         correct on and as of the date hereof as though made by Borrower on and
         as of such date (except to the extent that such representations and
         warranties relate solely to an earlier date) and (ii) no Event of
         Default or other event which with the passage of time or the giving of
         notice or both would constitute an Event of Default has occurred and is
         continuing; and

         (b) The execution and delivery of this Amendment shall in no way
         release, diminish, impair, reduce or otherwise adversely affect the
         obligations of Borrower under the International Loan Agreement, as
         amended by this Amendment, the Note or any other International Loan
         Document, as each of the foregoing documents and instruments may be
         further amended or otherwise modified from time to time.

5. This Amendment shall become effective when and only when (a) Bank shall have
received acknowledgment from the Eximbank, which acknowledgment is satisfactory
to Bank, that the Eximbank Guaranty remains in full force and effect
notwithstanding this Amendment and covers the Commitment in the amount
established by this Amendment, (b) Bank shall have executed a counterpart of
this Amendment and (c) Bank shall have received each of the following:

         (i) Counterparts of this Amendment executed by Borrower;

         (ii) An amended and restated International Revolving Note in the form
         of Exhibit B executed by Borrower;

         (iii) Such other documents and agreements as Bank may reasonably
         request, including without limitation, a new Loan Authorization Notice
         and new form of Borrower Agreement; and

         (iv) The facility fee agreed to in section 1 of this Amendment.

6. Borrower hereby ratifies (i) the International Loan Agreement, as amended by
this Amendment, (ii) the Note and (iii) the other International Loan Documents
to which Borrower is a party, and confirms that and of the rights and powers
created under each of the foregoing documents and instruments shall be and
remain in full force and effect.

7. The execution, delivery and effectiveness of this Amendment shall not operate
as a waiver of any right, power or remedy of Bank under the International Loan
Agreement, as amended by this Amendment, or under the Note or the other
International Loan Documents, as each may be amended or modified from time to
time, nor constitute a waiver of any other provision of the foregoing documents
and instruments, as each may be amended or modified from time to time. Borrower
agrees to do, execute, acknowledge and deliver all and every such further acts
and instruments as Bank may request for the better assuring and confirming unto
Bank all and singular the rights granted or intended to be granted hereby or
hereunder. This Amendment may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed and delivered shall be deemed to be an original and all of which taken
together shall constitute but one and the same instrument.

8. Pursuant to Section 11.3 of the International Loan Agreement, Borrower agrees
to pay on demand all costs and expenses of Bank in connection with the
preparation, reproduction, execution and delivery of this Amendment and the
other instruments and documents to be delivered hereunder (including, without
limitation, the reasonable fees and out-of-pocket expenses of course for Bank
with respect thereto and with respect to advising Bank as to its rights and
responsibilities under the International Loan Agreement, as hereby amended).

THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF TEXAS AND SHALL BE BINDING UPON BORROWER, BANK AND THEIR SUCCESSORS
AND ASSIGNS.

THIS WRITTEN AMENDMENT AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT THE
FINAL AGREEMENT BETWEEN THE PARTIES RESPECTING THE SUBJECT MATTER HEREOF AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

IN WITNESS WHEREOF, the parties hereto, by their officers thereunto duly
authorized, have executed this Amendment as of the day and year first above
written.

BORROWER: NATIONAL TANK COMPANY           BANK: CHASE BANK OF TEXAS,
                                                NATIONAL ASSOCIATION

By:                                       By:
   -------------------------------           --------------------------------
Name:                                     Name:
     -----------------------------             ------------------------------
Title:                                    Title:
      ----------------------------              -----------------------------

                                          By:
                                             --------------------------------
                                          Name:
                                               ------------------------------
                                          Title:
                                                -----------------------------



                                     Page 1
<PAGE>   61


                                   EXHIBIT "B"

             THIRD AMENDED AND RESTATED INTERNATIONAL REVOLVING NOTE

$5,000,000.00                                                   August 31, 1998

FOR VALUE RECEIVED, the undersigned, NATIONAL TANK COMPANY, a corporation
organized under the laws of the State of Delaware ("Borrower"), HEREBY PROMISES
TO PAY to the order of CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, a national
banking association ("Bank," formerly Texas Commerce Bank National Association),
on or before August 31, 1999 ("Maturity Date"), the principal sum of Five
Million and 00/100 Dollars ($5,000,000.00), or, if less, the aggregate principal
amount of Loans outstanding on the Maturity Date, in accordance with the terms
and provisions of that certain International Revolving Loan Agreement dated as
of June 30, 1997 by and among Borrower and Bank (as amended from time to time,
the "International Loan Agreement"; capitalized terms used herein and not
otherwise defined herein shall have the meanings ascribed to such terms in the
International Loan Agreement).

The outstanding principal balance of this Note shall be due and payable as
provided in the International Loan Agreement. Borrower promises to pay interest
on the unpaid principal balance of this Note from the date of any Loan evidenced
by this Note until the principal balance thereof is paid in full Interest shall
accrue on the outstanding principal balance of this Note from and including the
date of any Loan evidenced by this Note to but not including the Maturity Date
at the rate or rates, and shall be due and payable on the dates, set forth in
the International Loan Agreement. Any amount not paid when due with respect to
principal (whether at stated maturity, by acceleration or otherwise), costs or
expenses, or, to the extent permitted by applicable law, interest, shall bear
interest from the date when due to and excluding the date the same is paid in
full payable on demand, at the Past Due Rate.

Payments of principal and interest, and all amounts due with respect to costs
and expenses, shall be made in lawful money of the United States of America in
immediately available funds, without deduction, set-off or counterclaim to Bank,
or such other location as may be notified to Borrower by Bank, not later than
12:00 noon (Houston Time) on the dates on which such payments shall become due
pursuant to the terms and provisions set forth in the International Loan
Agreement.

If any payment of principal or interest on this Note shall become due on a
Saturday, Sunday, or public holiday on which Bank is not open for business, such
payment shall be made on the next succeeding Business Day and such extension of
time shall in such case be included in computing interest in connection with
such payment.

All loans and advances and all payments and prepayments made hereon shall be
recorded in the holder's records and such records shall be controlling.

In addition to all principal and accrued interest on this Note, Borrower agrees
to pay (a) all reasonable costs and expenses incurred by all owners and holders
of this Note in collecting this Note through any probate, reorganization, or any
other proceeding and (b) reasonable attorneys' fees when and if this Note is
placed in the hands of an attorney for collection after default.

All agreements among Borrower and Bank whether now existing or hereafter arising
and whether written or oral, are hereby expressly limited so that in no
contingency or event whatsoever, whether by reason of demand being made on this
Note or otherwise, shall the amount paid, or agreed to be paid, to Bank for the
use, forbearance, or detention of the money to be loaned under the International
Loan Agreement and evidenced by this Note or otherwise or for the payment or
performance of any covenant or obligation contained in the International Loan
Agreement, this Note or in any other International Loan Document exceed the
Highest Lawful Rate. If, as a result of any circumstances whatsoever,
fulfillment of any provision hereof or of any of such documents, at the time
performance of such provision shall be due, shall involve transcending the limit
of validity prescribed by applicable usury law, then, ipso facto, the obligation
to be fulfilled shall be reduced to the limit of such validity, and if, from any
such circumstance, Bank shall ever receive interest or anything which might be
deemed interest under applicable law which would exceed the Highest Lawful Rate,
such amount which would be excessive interest shall be applied to the reduction
of the principal amount owing on account of this Note or the amounts owing on
other obligations of Borrower to Bank under any International Loan Document and
not to the payment of interest, or if such excessive interest exceeds the unpaid
principal balance of this Note and the amounts owing on other obligations of
Borrower to Bank under any International Loan Documents, as the case may be,
such excess shall be refunded to Borrower. All sums paid or agreed to be paid to
Bank for the use, forbearance, or detention of the indebtedness of Borrower to
Bank shall, to the extent permitted by applicable law, be amortized, prorated,
allocated, and spread throughout the full term of such indebtedness until
payment in full of the principal thereof (including the period of any renewal or
extension thereof) so that the interest on account of such indebtedness shall
not exceed the Highest Lawful



                                     Page 1

<PAGE>   62

Rate. Notwithstanding anything to the contrary contained in the International
Loan Agreement or this Note, it is understood and agreed that if at any time the
rate of interest which accrues on the outstanding principal balance of this Note
shall exceed the Highest Lawful Rate, the rate of interest which accrues on the
outstanding principal balance of this Note shall be limited to the Highest
Lawful Rate, but any subsequent reductions in the rate of interest which accrues
on the outstanding principal balance of this Note shall not reduce the rate of
interest which accrues on the outstanding principal balance of this Note below
the Highest Lawful Rate until the total amount of interest accrued on the
outstanding principal balance of this Note equals the amount of interest which
would have accrued if such interest rate had at all times been in effect. The
terms and provisions of this paragraph shall control and supersede every other
provision of all agreements among Borrower and Bank. This Note is entitled to
the benefits of the International Loan Agreement, which International Loan
Agreement, among other things, contains provisions for acceleration of the
maturity hereof upon the happening of certain stated events, for prepayments on
account of principal hereof prior to the maturity hereof upon the terms and
conditions and with the effect therein specified, and provisions to the effect
that no provision of the International Loan Agreement or this Note shall require
the payment or permit the collection of interest in excess of the Highest
Lawful Rate. The obligations of Borrower hereunder are secured by the
International Security Documents. It is contemplated that by reason of
prepayments or repayments hereon prior to the Maturity Date, there may be times
when no indebtedness is owing hereunder prior to such date, but notwithstanding
such occurrences, this Note shall remain valid and shall be in full force and
effect as to Loans made pursuant to the International Loan Agreement subsequent
to each such occurrence.

Except as otherwise specifically provided for in the International Loan
Agreement, Borrower and any and all endorsers, guarantors and sureties severally
waive grace, demand, presentment for payment, notice of dishonor or default,
protest, notice of protest, notice of intent to accelerate, notice of
acceleration and diligence in collecting and bringing of suit against any party
hereto, and agree to all renewals, extensions or partial payments hereon, with
or without notice, before or after maturity.

This Note is the Note referred to in the International Loan Agreement and is
given in amendment, restatement and replacement, but not in extinguishment, of
the First [sic: should have been titled "Second"] Amended and Restated
International Revolving Note dated June 30, 1998 in the original principal
amount of $5,000,000 made by Borrower and payable to the order of Bank.

THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF
THE STATE OF TEXAS AND APPLICABLE FEDERAL LAW.

THIS NOTE AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT THE FINAL
AGREEMENT AMONG THE PARTIES AS TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES; AND THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE
PARTIES.

IN WITNESS WHEREOF Borrower has caused this Note to be executed and delivered by
its officer thereunto duly authorized effective as of the date first above
written.



NATIONAL TANK COMPANY

By: /s/ WILLIAM B. WIENER, III
   --------------------------------------
Name:   William B. Wiener, III
     ------------------------------------
Title:  Senior Vice President
      -----------------------------------



                                     Page 2
<PAGE>   63

           FOURTH AMENDMENT TO INTERNATIONAL REVOLVING LOAN AGREEMENT

THIS FOURTH AMENDMENT TO INTERNATIONAL REVOLVING LOAN AGREEMENT (this
"Amendment" or "Fourth Amendment") dated as of November 16, 1998 ("Effective
Date") is between NATIONAL TANK COMPANY, a Delaware corporation ("NATCO") and
TOTAL ENGINEERING SERVICES TEAM, INC., a Louisiana corporation ("TEST")
(jointly and severally, "Borrower") and Chase Bank of Texas, National
Association, a national banking association (formerly Texas Commerce Bank
National Association, together with its successors and assigns, "Bank").

                                R E C I T A L S

WHEREAS, NATCO and Bank are parties to that certain International Revolving
Loan Agreement dated as of June 30, 1997 (as amended from time to time, the
"Loan Agreement"); and

WHEREAS, NATCO and TEST have requested that TEST be added as a Borrower,
jointly and severally with NATCO, as a party to the Loan Agreement; and

WHEREAS, NATCO has agreed to acquire The Cynara Company, a Delaware corporation
("Cynara") subsidiary of NATCO, and has requested that Bank provide certain
waivers and modifications of the Loan Agreement appropriate to permitting such
acquisition; and

WHEREAS, the parties desire to make certain other modifications and other
agreements pursuant to this Amendment as provided herein; and

WHEREAS, pursuant to the terms and conditions hereof Bank has agreed to so
amend the Loan Agreement, subject to the condition precedent that Bank shall
have in hand the approval(s) of the Exim Bank requisite to continuing coverage
under the Working Capital Guarantee program;

NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants herein set forth and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Borrowers and Bank
hereby agree as follows:

1. Definitions generally; references. Capitalized terms used herein and not
otherwise defined herein shall have the meanings set forth in the Loan
Agreement. All references to Section numbers in this Amendment shall be
references to the corresponding Section of the International Loan Agreement. On
and after the date hereof, each reference in the International Loan Agreement
to "this Agreement," "hereunder," "herein," or words of like import shall mean
and be a reference to the Loan Agreement, as amended hereby.

2. Exhibit A to the Loan Agreement is hereby amended by inserting therein in
proper alphabetical order the following new definitions:

         "Borrowers" means NATIONAL TANK COMPANY and TOTAL ENGINEERING SERVICES
         TEAM, INC., jointly and severally. "Borrower" shall refer to each and
         both Borrowers, jointly and severally.
         "Borrowers Agreement" shall mean Borrower Agreement executed as of the
         date of this Amendment and any amendment, modification and replacement
         thereof.
         "International Security Agreement" shall mean and include each and
         both of (a) the International Security Agreement executed and
         delivered by NATCO for the benefit of the Bank effective as of June
         30, 1997; and (b) the International Security Agreement dated as of
         even date with the Fourth Amendment, executed by TEST for the benefit
         of the Bank; and any and all amendments, modifications, renewals and
         extensions of the foregoing.
         "Note" shall refer to the Fourth Amended and Restated International
         Revolving Note executed by NATCO and TEST, jointly and severally, as
         of the Fourth Amendment Effective Date (form attached to the Fourth
         Amendment as Exhibit B, replacing existing Exhibit B), and each
         renewal, extension, replacement, modification and other rearrangement
         thereof.

3. The parties agree that notwithstanding anything to the contrary in any
International Loan Document, (1) either Borrower shall be entitled to request a
Loan or Letter of Credit and the obligation thereby created shall be the joint
and several liability of the Borrowers (and Exhibits C (request for loan), G
(rate change notice) and I (request for letter of credit) are deemed modified
accordingly); and (2) each compliance certificate, borrowing base certificate
and similar certificate and representation of Borrowers shall be executed and
delivered by both Borrowers (a modified Exhibit D, borrowing base certificate,
attached to this Amendment replacing existing Exhibit D).

4. Bank hereby consents, in keeping with Section 9.2, to NATCO's acquisition of
Cynara as a subsidiary of NATCO, on substantially the terms and conditions
reflected in written materials provided to Bank prior to the execution of this
Amendment. Schedule 6.1 is amended to add the name of Cynara as a 100% owned
subsidiary of National Tank Company.

5. Borrower has requested and Bank has agreed to waive, on a one time basis,
the agreement in Section 9.9 that Borrower not change its fiscal year, so that
Borrower may change its fiscal year to years ending December 31. No other
waiver of such section or any other section has been promised by Bank or will
be relied upon by Borrower as forthcoming from Bank.

6. The definition of "Domestic Credit Agreement" refers to the Loan Agreement
dated June 30, 1997 between Borrower and the Domestic Lenders, as the same may
be amended from time to time. The parties hereby agree that the Loan Agreement
among NATCO, NATCO Canada Ltd., Bank (as U.S. Agent), The Bank of Nova Scotia
(as Canadian Agent) and certain other lenders, providing for a $25,000,000 US
revolving loan facility, $10,000,000 Canadian revolving loan facility and a
$32,500,000 term loan facility, which the parties expect to be executed
(subject to adjustments in the approximate amounts of such facilities) on or
about the Fourth Amendment Effective Date, shall be deemed an amendment of the
Domestic Credit Agreement for purposes of the Loan Agreement.

7. By its execution and delivery hereof, Borrower represents and warrants the
following:

         (a) As of the date hereof and after giving effect to the amendments
         contemplated herein, (i) the representations and warranties contained
         in Section 6 of the International Loan Agreement, as amended by this
         Amendment, the other International Loan Documents and the Domestic
         Loan Documents to which Borrower is a party, are true and correct on
         and as of the date hereof as though made by Borrower on and as of such
         date (except to the extent that such representations and warranties
         relate solely

                                    Page 1

<PAGE>   64
         to an earlier date) and (ii) no Event of Default or other event which
         with the passage of time or the giving of notice or both would
         constitute an Event of Default has occurred and is continuing; and
         (b) The execution and delivery of this Amendment shall in no way
         release, diminish, impair, reduce or otherwise adversely affect the
         obligations of Borrower under the International Loan Agreement, as
         amended by this Amendment, the Note or the Amended and Restated Note
         (as hereinafter defined), the other International Loan Documents and
         the Domestic Loan Documents, as each of the foregoing documents and
         instruments may be further amended or otherwise modified from time to
         time.

8. This Amendment shall become effective when and only when (a) with respect to
providing credit to TEST and on the security of TEST receivables only, Bank
shall have received acknowledgment from the Eximbank, which acknowledgment is
satisfactory to Bank, that the Eximbank Guaranty remains in full force and
effect notwithstanding this Amendment and covers the Commitment in the amount
established by this Amendment, (b) Bank shall have executed a counterpart of
this Amendment and (c) Bank shall have received each of the following:

         (i) Counterparts of this Amendment executed by Borrower; an
         International Security Agreement executed and delivered by TEST;
         Amendments to Guaranty executed and delivered by NATCO Group Inc.,
         formerly known as Cummings Point Industries, Inc.;
         (ii) A Fourth Amended and Restated International Revolving Note in the
         principal amount of $5,000,000.00 executed by Borrowers ("Amended and
         Restated Note"); and
         (iii) Such other documents and agreements as Bank may reasonably
         request, including without limitation, a new Loan Authorization Notice
         and new form of Borrower Agreement.

9. Borrower hereby ratifies (i) the International Loan Agreement, as amended by
this Amendment, (ii) the Note, (iii) the other International Loan Documents to
which Borrower is a party and (iv) the Domestic Loan Documents to which
Borrower is a party, and confirms that and of the rights and powers created
under each of the foregoing documents and instruments shall be and remain in
full force and effect.

10. The execution, delivery and effectiveness of this Amendment shall not
operate as a waiver of any right, power or remedy of Bank under the
International Loan Agreement, as amended by this Amendment, or under the Note,
the other International Loan Documents or the Domestic Loan Documents to which
Borrower is a party, as each may be amended or modified from time to time, nor
constitute a waiver of any other provision of the foregoing documents and
instruments, as each may be amended or modified from time to time.

11. Borrower agrees to do, execute, acknowledge and deliver all and every such
further acts and instruments as Bank may request for the better assuring and
confirming unto Bank all and singular the rights granted or intended to be
granted hereby or hereunder.

12. Pursuant to Section 11.3 of the International Loan Agreement, Borrower
agrees to pay on demand all costs and expenses of Bank in connection with the
preparation, reproduction, execution and delivery of this Amendment and the
other instruments and documents to be delivered hereunder (including, without
limitation, the reasonable fees and out-of-pocket expenses of course for Bank
with respect thereto and with respect to advising Bank as to its rights and
responsibilities under the International Loan Agreement, as hereby amended). In
addition, Borrower shall pay any and all stamp and other taxes and fees payable
or determined to be payable in connection with the execution and delivery,
filing or recording of this Amendment and the other instruments and documents
to be delivered hereunder and agrees to save Bank harmless from and against any
and all liabilities with respect to or resulting from any delay in paying or
omission to pay such taxes or fees.

13. THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF TEXAS AND SHALL BE BINDING UPON BORROWER AND BANK AND
THEIR SUCCESSORS AND ASSIGNS.

14. This Amendment may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed and delivered shall be deemed to be an original and all of which taken
together shall constitute but one and the same instrument.

15. THIS WRITTEN AMENDMENT, THE INTERNATIONAL LOAN AGREEMENT, THE NOTE, THE
AMENDED AND RESTATED NOTE, THE OTHER INTERNATIONAL LOAN DOCUMENTS, THE DOMESTIC
LOAN DOCUMENTS AND THE OTHER DOCUMENTS EXECUTED IN CONNECTION THEREWITH
REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES RESPECTING THE SUBJECT MATTER
HEREOF AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES.

IN WITNESS WHEREOF, the undersigned, by their officers duly authorized, have
executed this Amendment as of the day and year first above written.

<TABLE>
<S>                                                                   <C>
BORROWER: NATIONAL TANK COMPANY                                       BANK: CHASE BANK OF TEXAS, NATIONAL ASSOCIATION

By: /s/ WILLIAM B. WIENER, III                                        By:
   ----------------------------------------------                        --------------------------------------------
Name:   William B. Wiener, III                                        Name:
     --------------------------------------------                          ------------------------------------------
Title:  Senior Vice President                                         Title:
      -------------------------------------------                           -----------------------------------------
Address:
        -----------------------------------------                     By:
                                                                         --------------------------------------------
BORROWER: TOTAL ENGINEERING SERVICES TEAM, INC.

By: /s/ WILLIAM B. WIENER, III                                        Name:
   ----------------------------------------------                          ------------------------------------------
Name:   William B. Wiener, III                                        Title:
     --------------------------------------------                           -----------------------------------------
Title:  Senior Vice President
      -------------------------------------------
Address:
        -----------------------------------------
</TABLE>








                                    Page 2

<PAGE>   65

                                  EXHIBIT "B"

            FOURTH AMENDED AND RESTATED INTERNATIONAL REVOLVING NOTE

$5,000,000.00                                                 November 16, 1998

FOR VALUE RECEIVED, the undersigned, NATIONAL TANK COMPANY, a corporation
organized under the laws of the State of Delaware ("NATCO") and TOTAL
ENGINEERING SERVICES TEAM, INC., a corporation organized under the laws of the
State of Louisiana ("TEST") (whether one or more, jointly and severally,
"Borrower"), HEREBY PROMISE TO PAY to the order of CHASE BANK OF TEXAS,
NATIONAL ASSOCIATION, a national banking association ("Bank", formerly Texas
Commerce Bank National Association), on or before August 31, 1999 ("Maturity
Date"), the principal sum of Five Million and 00/100 Dollars ($5,000,000.00),
or, if less, the aggregate principal amount of Loans outstanding on the
Maturity Date, in accordance with the terms and provisions of that certain
International Revolving Loan Agreement dated as of June 30, 1997 by and among
Borrower and Bank (as amended from time to time, the "International Loan
Agreement"; capitalized terms used herein and not otherwise defined herein
shall have the meanings ascribed to such terms in the International Loan
Agreement).

The outstanding principal balance of this Note shall be due and payable as
provided in the International Loan Agreement. Borrower promises to pay interest
on the unpaid principal balance of this Note from the date of any Loan
evidenced by this Note until the principal balance thereof is paid in full
Interest shall accrue on the outstanding principal balance of this Note from
and including the date of any Loan evidenced by this Note to but not including
the Maturity Date at the rate or rates, and shall be due and payable on the
dates, set forth in the International Loan Agreement. Any amount not paid when
due with respect to principal (whether at stated maturity, by acceleration or
otherwise), costs or expenses, or, to the extent permitted by applicable law,
interest, shall bear interest from the date when due to and excluding the date
the same is paid in full payable on demand, at the Past Due Rate.

Payments of principal and interest, and all amounts due with respect to costs
and expenses, shall be made in lawful money of the United States of America in
immediately available funds, without deduction, set-off or counterclaim to
Bank, or such other location as may be notified to Borrower by Bank, not later
than 12:00 noon (Houston Time) on the dates on which such payments shall become
due pursuant to the terms and provisions set forth in the International Loan
Agreement.

If any payment of principal or interest on this Note shall become due on a
Saturday, Sunday, or public holiday on which Bank is not open for business,
such payment shall be made on the next succeeding Business Day and such
extension of time shall in such case be included in computing interest in
connection with such payment.

All loans and advances and all payments and prepayments made hereon shall be
recorded in the holder's records and such records shall be controlling.

In addition to all principal and accrued interest on this Note, Borrower agrees
to pay (a) all reasonable costs and expenses incurred by all owners and holders
of this Note in collecting this Note through any probate, reorganization, or
any other proceeding and (b) reasonable attorneys' fees when and if this Note
is placed in the hands of an attorney for collection after default.

                                    Page 1

<PAGE>   66

All agreements among Borrower and Bank whether now existing or hereafter
arising and whether written or oral, are hereby expressly limited so that in no
contingency or event whatsoever, whether by reason of demand being made on this
Note or otherwise, shall the amount paid, or agreed to be paid, to Bank for the
use, forbearance, or detention of the money to be loaned under the
International Loan Agreement and evidenced by this Note or otherwise or for the
payment or performance of any covenant or obligation contained in the
International Loan Agreement, this Note or in any other International Loan
Document exceed the Highest Lawful Rate. If, as a result of any circumstances
whatsoever, fulfillment of any provision hereof or of any of such documents, at
the time performance of such provision shall be due, shall involve transcending
the limit of validity prescribed by applicable usury law, then, ipso facto, the
obligation to be fulfilled shall be reduced to the limit of such validity, and
if, from any such circumstance, Bank shall ever receive interest or anything
which might be deemed interest under applicable law which would exceed the
Highest Lawful Rate, such amount which would be excessive interest shall be
applied to the reduction of the principal amount owing on account of this Note
or the amounts owing on other obligations of Borrower to Bank under any
International Loan Document and not to the payment of interest, or if such
excessive interest exceeds the unpaid principal balance of this Note and the
amounts owing on other obligations of Borrower to Bank under any International
Loan Documents, as the case may be, such excess shall be refunded to Borrower.
All sums paid or agreed to be paid to Bank for the use, forbearance, or
detention of the indebtedness of Borrower to Bank shall, to the extent
permitted by applicable law, be amortized, prorated, allocated, and spread
throughout the full term of such indebtedness until payment in full of the
principal thereof (including the period of any renewal or extension thereof) so
that the interest on account of such indebtedness shall not exceed the Highest
Lawful Rate. Notwithstanding anything to the contrary contained in the
International Loan Agreement or this Note, it is understood and agreed that if
at any time the rate of interest which accrues on the outstanding principal
balance of this Note shall exceed the Highest Lawful Rate, the rate of interest
which accrues on the outstanding principal balance of this Note shall be
limited to the Highest Lawful Rate, but any subsequent reductions in the rate
of interest which accrues on the outstanding principal balance of this Note
shall not reduce the rate of interest which accrues on the outstanding
principal balance of this Note below the Highest Lawful Rate until the total
amount of interest accrued on the outstanding principal balance of this Note
equals the amount of interest which would have accrued if such interest rate
had at all times been in effect. The terms and provisions of this paragraph
shall control and supersede every other provision of all agreements among
Borrower and Bank. This Note is entitled to the benefits of the International
Loan Agreement, which International Loan Agreement, among other things,
contains provisions for acceleration of the maturity hereof upon the happening
of certain stated events, for prepayments on account of principal hereof prior
to the maturity hereof upon the terms and conditions and with the effect
therein specified, and provisions to the effect that no provision of the
International Loan Agreement or this Note shall require the payment or permit
the collection of interest in excess of the Highest Lawful Rate. The
obligations of Borrower hereunder are secured by the International Security
Documents. It is contemplated that by reason of prepayments or repayments
hereon prior to the Maturity Date, there may be times when no indebtedness is
owing hereunder prior to such date, but notwithstanding such occurrences, this
Note shall remain valid and shall be in full force and effect as to Loans made
pursuant to the International Loan Agreement subsequent to each such
occurrence.

Except as otherwise specifically provided for in the International Loan
Agreement, Borrower and any and all endorsers, guarantors and sureties
severally waive grace, demand, presentment for payment, notice of dishonor or
default, protest, notice of protest, notice of intent to accelerate, notice of
acceleration and diligence in collecting and bringing of suit against any party
hereto, and agree to all renewals, extensions or partial payments hereon, with
or without notice, before or after maturity.


                                    Page 2

<PAGE>   67

This Note is the Note referred to in the International Loan Agreement and is
given in amendment, restatement and replacement, and add Borrower TEST as a
co-maker to, but not in extinguishment, of the Third Amended and Restated
International Revolving Note dated August 31, 1998 in the original principal
amount of $5,000,000 made by Borrower and payable to the order of Bank.
THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF
THE STATE OF TEXAS AND APPLICABLE FEDERAL LAW.

THIS NOTE AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT THE FINAL
AGREEMENT AMONG THE PARTIES AS TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES; AND THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE
PARTIES.

IN WITNESS WHEREOF each Borrower has caused this Note to be executed and
delivered by its officer thereunto duly authorized effective as of the date
first above written.

BORROWER: NATIONAL TANK COMPANY

By: /s/ WILLIAM B. WIENER, III
   ---------------------------------------------
Name:   William B. Wiener, III
     -------------------------------------------
Title:  Senior Vice President
      ------------------------------------------

BORROWER:  TOTAL ENGINEERING SERVICES TEAM, INC.

By: /s/ WILLIAM B. WIENER, III
   ---------------------------------------------
Name:   William B. Wiener, III
     -------------------------------------------
Title:  Senior Vice President
      ------------------------------------------


                                    Page 3

<PAGE>   68

                                  EXHIBIT "D"

                    INTERNATIONAL BORROWING BASE CERTIFICATE

                    As of period ended ________________, 19

Reference is made to that certain International Revolving Loan Agreement dated
as of June 30, 1997 (as amended, modified and supplemented and in effect from
time to time, the "International Loan Agreement") by and between NATIONAL TANK
COMPANY, a corporation duly organized and validly existing under the laws of
the State of Texas and TOTAL ENGINEERING SERVICES TEAM, INC., a corporation
duly organized and validly existing under the laws of the State of Louisiana
(jointly and severally, "Borrowers") and CHASE BANK OF TEXAS, NATIONAL
ASSOCIATION, a national banking association ("Bank"). Terms defined in the
International Loan Agreement are used herein as defined therein.

Pursuant to Section 8.1(c) of the International Loan Agreement, the
undersigned, the President(s) or Chief Financial Officer(s) of Borrowers,
hereby certify that, to the best of their knowledge and belief after reasonable
and due investigation and review, (i) attached hereto as Annex 1 is a true and
accurate calculation of the International Borrowing Base as of
_______________________, 19 __ in accordance with the requirements set forth in
the International Loan Agreement and (ii) attached hereto as Annex 2 is a true
and accurate schedule which specifically identifies the Eligible Accounts
Receivable and Eligible Inventory in accordance with the requirements of the
Eximbank.

IN WITNESS WHEREOF, the undersigned have caused this International Borrowing
Base Certificate to be duly executed as of the day of ________________, 19__ .


BORROWER: NATIONAL TANK COMPANY

By: /s/ WILLIAM B. WIENER, III
   ---------------------------------------------
Name:  William B. Wiener, III
     -------------------------------------------
Title:  Senior Vice President
      ------------------------------------------


BORROWER:  TOTAL ENGINEERING SERVICES TEAM, INC.

By: /s/ WILLIAM B. WIENER, III
   ---------------------------------------------
Name:  William B. Wiener, III
     -------------------------------------------
Title:  Senior Vice President
      ------------------------------------------

                                       1

<PAGE>   69

                                    ANNEX 1
                    International Borrowing Base Calculation


1.A.    Total Eligible Accounts Receivable of NATCO and TEST
                                                                 --------------
  B.    Advance Rate: 90%
                                                                 --------------

  C.    Total Eligible Inventory of NATCO and TEST
                                                                 --------------

  D.    Advance Rate: 75%
                                                                 --------------

2.      Line 1B plus 1D equals: International
        Borrowing Base as of
                              ----------------------             --------------

3.      Lesser of No. 2 above or the Commitment
                                                                 --------------

4.      Less the International Exposure
        [Loans outstanding plus Letters of Credit
        (Face Value x collateral requirement)                    --------------
        under this facility]*
                                                                 --------------

5.      Borrowing Availability
                                                                 --------------

        A.   If a negative number, the amount
             of paydown and/or additional collateral required
                                                                 --------------

        B.   If a positive number, the amount
             of borrowing availability
                                                                 --------------

7.      Requested Action:

        A.   Paydown.
                                                                 --------------

         B. Drawdown
                                                                 --------------

         C. Letter of Credit (Face Value)
                                                                 --------------


*        The face value of Letters of Credit issued under this facility plus
         Loans outstanding under this facility cannot exceed the amount of the
         Commitment

*        Subject to review of the transaction, Bank may allow the inclusion of
         L/C so that are less than 100% collateralized.



                                       1

<PAGE>   70

                                    ANNEX 2
             International Borrowing Base Detailed Schedule Report


1.Eligible Accounts Receivable. Borrowers represent and warrant that all of the
accounts receivable outlined below meet the requirements set forth in the
definition of "Eligible Accounts Receivables."


[SCHEDULE TO BE USED IF ACCOUNTS RECEIVABLE ARISE UNDER AN EXPORT ORDER:

A.   Receivables covered by letters of credit issued and/or confirmed in
     accordance with Section 8.10 of the International Loan Agreement. Copies
     of such letters of credit and assignments of proceeds of such letters of
     credit are attached hereto or have already been provided to Bank.

<TABLE>
<CAPTION>
                                                   Invoice
          Customer Country         Amount            Date         L/C Bank
          ----------------         ------            ----         --------
<S>                                <C>              <C>           <C>
          1.
          2.
          3.
</TABLE>

B.   Receivables insured by export insurance in accordance with Section 8.7 of
     the International Loan Agreement. True and correct copies of such
     insurance policies together with all endorsements' declarations,
     amendments and renewals thereto have been delivered to Bank. True and
     correct copies of the notification of assignment of insurance claims under
     such policies have been delivered to Bank.

<TABLE>
<CAPTION>
                                                   Invoice
          Customer Country         Amount            Date         SBCL of DCL
          ----------------         ------            ----         -----------
<S>                                <C>              <C>           <C>
          1.
          2.
          3.
</TABLE>

C.   Receivables arising from documentary collections, cash against documents
     transactions and other receivables otherwise approved in writing by Bank
     and Eximbank.

<TABLE>
<CAPTION>
                                                   Invoice
          Customer Country         Amount            Date         Payment Terms
          ----------------         ------            ----         -------------
<S>                                <C>              <C>           <C>
          1.
          2.
          3.
</TABLE>

2.       Eligible Inventory

A.   Borrowers represent and warrant that all of the inventory outlined below
     meets the requirements set forth in the definition of "Eligible Inventory."
     Without limitation of the foregoing, Borrowers represent and warrant
     that all such inventory contains at least 50% U. S. content and that all
     of such inventory is supported by an Export Order or an Indirect Export
     Order on file with Borrowers.

         Inventory Supported by Purchase Order:

                           Finished Goods
                                         -------------------------------------
                           Work-in-Process
                                          ------------------------------------
                           Raw Materials
                                        --------------------------------------

         Inventory Not Supported by Purchase Order:

                           Finished Goods
                                         -------------------------------------
                           Work-in-Process
                                          ------------------------------------
                           Raw Materials
                                        --------------------------------------

                  Total:
                        ======================================================

              Note: Describe any large or special inventory items.

                                       1

<PAGE>   71

                             ADDITIONAL COLLATERAL

1. Export-related receivables and inventory no longer Eligible-which have
previously been included in an International Borrowing Base Certificate and
which remain as Collateral for the International Obligations.

                                     [List]


                                  ATTACHMENTS

1.       Export Orders

In accordance with Section 7.2 of the International Loan Agreement attached
hereto are copies of all new executed Export Orders, as outlined below:

<TABLE>
<CAPTION>
                                                     Invoice
Customer    Country                     Amount         Date       Payment Terms
- --------    -------                     ------         ----       -------------
<S>         <C>                         <C>          <C>          <C>
       1.
       2.
       3.
</TABLE>

2.       Export Insurance

         In accordance with Section 8.7 of the International Loan Agreement
         attached hereto are duly executed copies of the export insurance
         policies, together with endorsements, declarations, amendments and
         renewals which have not been previously provided to Bank:

3.       Other Information or Special Requests



                                       2
<PAGE>   72
                               FIFTH AMENDMENT TO
                     INTERNATIONAL REVOLVING LOAN AGREEMENT


                           Dated as of July 23, 1999

                  This Fifth Amendment to International Revolving Loan
Agreement (this "Amendment") is entered into as of July 23, 1999, by and among
NATIONAL TANK COMPANY, a Delaware corporation ("NATCO"), TOTAL ENGINEERING
SERVICES TEAM, INC., a Louisiana corporation ("TEST") (jointly and severally,
NATCO and TEST, the "Borrower" or the "Borrowers"), and CHASE BANK OF TEXAS,
NATIONAL ASSOCIATION, a national banking association (formerly Texas Commerce
Bank National Association, together with its successors and assigns, the
"Bank").

                                   RECITALS:

                  WHEREAS, NATCO and the Bank are parties to that certain
International Revolving Loan Agreement, dated as of June 30, 1997; as amended
by that certain First Amendment to International Revolving Loan Agreement,
dated as of August 8, 1997; as further amended by that certain Second Amendment
to International Revolving Loan Agreement, dated as of June 30, 1998; as
further amended by that certain Third Amendment to International Revolving Loan
Agreement, dated as of August 31, 1998; and as further amended by that certain
Fourth Amendment to International Revolving Loan Agreement, dated as of
November 16, 1998, which Fourth Amendment is between NATCO, TEST, and the Bank
(as amended to the date hereof, the "Original International Loan Agreement");
and

                  WHEREAS, the Borrowers have requested that the Bank modify
the Original International Loan Agreement to, among other things, (a) increase
the Commitment to Ten Million Dollars ($10,000,000), (b) extend the Maturity
Date from August 31, 1999 to July 23, 2002, and (c) to comply with the new
Eximbank Guaranty; and

                  WHEREAS, pursuant to the terms and conditions hereof, the
Bank has agreed to amend the Original International Loan Agreement, on the
terms and conditions and as set forth herein;

                  NOW, THEREFORE, for good and valuable consideration, the
Original International Loan Agreement is hereby amended as hereinafter set
forth, subject to the conditions precedent set forth in this Amendment.

         SECTION 1. Definitions. Capitalized terms used herein and not
otherwise defined herein shall have the meanings set forth in the Original
International Loan Agreement.


                                     - 1 -

<PAGE>   73



         SECTION 2. Amendments to Original International Loan Agreement. The
Original International Loan Agreement is, effective as of the date hereof,
hereby amended as follows:

                  a. Exhibit A to the Original International Loan Agreement is
         hereby amended by amending the following definitions in their entirety
         as follows:

                           "Borrower Agreement" shall mean the Borrower
                  Agreement executed by the Borrowers as of July 23, 1999, and
                  any amendment, modification and replacement thereof.

                           "Eximbank Guaranty" shall mean that certain Master
                  Guaranty Agreement No. TX-________-MGA-99 dated as of July
                  23, 1999 between the Eximbank and the Bank, as the same may
                  be amended, modified or supplemented from time to time.

                           "Maturity Date" shall mean July 23, 2002.

                           "Note" shall mean that certain Fifth Amended and
                  Restated International Revolving Note executed and delivered
                  by NATCO and TEST, jointly and severally, as of July 23,
                  1999, and each renewal, extension, amendment, replacement,
                  modification or other rearrangement thereof.

                  b. Exhibit B to the Original International Loan Agreement is
         hereby replaced with Exhibit B attached hereto.

                  c. Section 2.1(a) of the Original International Loan
         Agreement is hereby amended in its entirety as follows:

                           (a) Upon the terms and conditions and relying upon
                  the representations and warranties herein set forth, the Bank
                  agrees to make Loans to the Borrower on any one or more
                  Business Days prior to the Maturity Date, up to an aggregate
                  principal amount of Loans not exceeding at any one time
                  outstanding the lesser of (i) $10,000,000.00 (such amount, as
                  it may be reduced from time to time pursuant to Section 3.6,
                  being the Bank's "Commitment") or (ii) the International
                  Borrowing Base. Subject to the terms and conditions of this
                  Agreement, the Borrower may borrow, repay and reborrow
                  hereunder. As of July 23, 1999, after giving effect to the
                  Fifth Amendment, the unused Commitment is $6,893,301.00.

                  d. Section 2.3(iv) of the Original International Loan
         Agreement is hereby amended in its entirety as follows:

                           (iv) unless the Bank shall give its prior written
                  consent in its sole discretion, the expiry date is later than
                  twelve (12) months from the date of issuance of such Letter
                  of Credit.


                                     - 2 -

<PAGE>   74



                  e. Section 4.1 of the Original International Loan Agreement
         is hereby amended in its entirety as follows:

                           The Borrower shall pay to the Bank on July 23, 1999
                           and on each Loan Facility Anniversary Date a
                           non-refundable facility fee in an amount equal to
                           the product of (x) the Commitment, (y) the Annual
                           Facility Fee Percentage, and (z) a fraction, the
                           numerator of which is the number of months or a
                           portion thereof remaining in the Loan Facility Term
                           (not to exceed twelve (12) months), and the
                           denominator of which is twelve (12).

                           Notwithstanding the foregoing sentence, if the
                           criteria set forth in Exhibit 1 to the Eximbank
                           Guaranty and in all amendments, supplements and
                           replacements of such Exhibit delivered to the Bank
                           at least ten (10) days prior to the effectiveness
                           thereof (the "Criteria For Reduced Facility Fee")
                           are satisfied, the Annual Facility Fee Percentage
                           shall be reduced to 1.00%; provided, however, if the
                           Loan Facility Term exceeds (12) months or is subject
                           to an Extension, the Criteria For Reduced Facility
                           Fee must be met on each Loan Facility Anniversary
                           Date or the date of such Extension. For purposes of
                           the facility fee payment due July 23, 1999, the
                           Annual Facility Fee Percentage is 1.00%.

                  f. Article 6 of the Original International Loan Agreement is
         hereby amended by inserting at the end thereof the following new
         section:

                                    6.15. YEAR 2000. Any reprogramming required
                           to permit the proper functioning, in and following
                           the year 2000, of (i) the Borrowers' computer
                           systems and (ii) equipment containing embedded
                           microchips (including systems and equipment supplied
                           by others or with which Borrowers' systems
                           interface) and the testing of all such systems and
                           equipment, as so reprogrammed, will be completed by
                           July 12, 1999. The cost to the Borrowers of such
                           reprogramming and testing and of the reasonably
                           foreseeable consequences of year 2000 to the
                           Borrowers (including, without limitation,
                           reprogramming errors and the failure of others'
                           systems or equipment) will not result in a Default
                           or a Material Adverse Effect. Except for such of the
                           reprogramming referred to in the preceding sentence
                           as may be necessary, the computer and management
                           information systems of the Borrowers and their
                           respective Subsidiaries are and, with ordinary
                           course upgrading and maintenance, will continue for
                           the term of this Agreement to be, sufficient to
                           permit the Borrowers to conduct their respective
                           business without Material Adverse Effect.

                  g. The definition of "Eligible Accounts Receivable" is hereby
         amended by inserting at the end thereof the following:

                           The value of each Eligible Accounts Receivable shall
                           be, at the date of determination thereof, the
                           aggregate face amount of such Eligible Accounts

                                     - 3 -

<PAGE>   75



                           Receivable less taxes, discounts, credits,
                           allowances and Retainages, except to the extent
                           otherwise permitted by the Bank in writing.

                  h. Exhibit A to the Original Loan Agreement is hereby amended
         by inserting therein in proper alphabetical order the following:

                           "Annual Facility Fee Percentage" shall mean one and
                  one-half percent (1.50%), subject to reduction as set forth
                  in Section 4.1.

                           "Criteria For Reduced Facility Fee" shall have the
                  meaning set forth in Section 4.1.

                           "Extension" shall have the meaning set forth in the
                  Eximbank Guaranty.

                           "Final Disbursement Date" shall have the meaning set
                  forth in the Eximbank Guaranty.

                           "Loan Facility Anniversary Date" shall mean each one
                  (1) year anniversary of July 23, 1999.

                           "Loan Facility Term" shall mean the number of months
                  from July 23, 1999 to the Final Disbursement Date as
                  originally set forth in the Loan Authorization Agreement.

                  i. Borrower acknowledges and agrees that the International
         Loan Documents shall be monitored and serviced by the domestic
         asset-based lending division of the Lender or its affiliate.

         SECTION 3. Conditions of Effectiveness. The effectiveness of this
Amendment is subject to the conditions precedent that on or before the date
hereof:

                  a. The Bank shall have received the following, each in form
         and substance and dated as of a date satisfactory to the Bank:

                           (i) a fully executed copy of the new Eximbank
                  Guaranty;

                           (ii) a minimum of three counterparts of this
                  Amendment executed by each party hereto;

                           (iii) an original Note executed and delivered by the
                  Borrowers, jointly and severally (promptly after this
                  Amendment becomes effective, the Bank shall return to the
                  Borrowers the Fourth Amended and Restated International
                  Revolving Note, dated as of November 16, 1998);

                           (iv) two (2) completed originals of the new Borrower
                  Agreement executed by the Borrowers and the Guarantor;


                                     - 4 -

<PAGE>   76



                           (v) a new fully executed Delegated Authority Letter
                  Agreement;

                           (vi) payment of the facility fee due on July 23,
                  1999;

                           (vii) a letter from Eximbank in the form of Exhibit
                  A attached hereto;

                           (viii) the consent of the Guarantor to this
                  Amendment and the previous amendments to the Original
                  International Loan Agreement; and

                           (ix) such other information and documents as may be
                  requested by the Bank or its counsel.

                  b. The Bank shall be satisfied that the applicable conditions
         set forth in Section 6 of the Delegated Authority Letter Agreement
         have been satisfied.

         SECTION 4. Representations and Warranties of the Borrowers. Each
Borrower represents and warrants to the Bank that, at the time of execution
hereof:

                  a. As of the date hereof and after giving effect to the
         amendments contemplated herein, (i) the representations and warranties
         contained in Section 6 of the International Loan Agreement, as amended
         by this Amendment, the other International Loan Documents and the
         Domestic Loan Documents to which Borrower is a party, are true and
         correct on and as of the date hereof as though made by Borrower on and
         as of such date (except to the extent that such representations and
         warranties relate solely to an earlier date) and (ii) no Event of
         Default or other event which with the passage of time or the giving of
         notice or both would constitute an Event of Default has occurred and
         is continuing; and

                  b. The execution and delivery of this Amendment shall in no
         way release, diminish, impair, reduce or otherwise adversely affect
         the obligations of Borrower under the International Loan Agreement, as
         amended by this Amendment, the Note, the other International Loan
         Documents and Domestic Loan Documents, as each of the foregoing
         documents and instruments may be further amended or otherwise modified
         from time to time.

         SECTION 5. Ratification. Each Borrower hereby ratifies (i) the
International Loan Agreement, as amended by this Amendment, (ii) the Note,
(iii) the other International Loan Documents to which Borrower is a party and
(iv) the Domestic Loan Documents to which Borrower is a party, and confirms
that and of the rights and powers created under each of the foregoing documents
and instruments shall be and remain in full force and effect.

         SECTION 6. Reference to and Effect on the International Loan
Documents. Upon the effectiveness of this Amendment, on and after the date
hereof each reference in the Original International Loan Agreement to "this
Agreement", "hereunder", "hereof" or words of like import referring to the
Original International Loan Agreement, and each reference in the other
International Loan Documents to the "International Loan Agreement",
"thereunder", "thereof" or words of like import referring to the Original
International Loan Agreement, shall mean and be a reference to the Original
International Loan Agreement as amended hereby.

                                     - 5 -

<PAGE>   77



         SECTION 7. Payment of Expenses. Pursuant to Section 11.3 of the
International Loan Agreement, each Borrower agrees to pay on demand all costs
and expenses of Bank in connection with the preparation, reproduction,
execution and delivery of this Amendment and other instruments and documents to
be delivered hereunder (including, without limitation, the reasonable fees and
out-of-pocket expenses of course for Bank with respect thereto and with respect
to advising Bank as to its rights and responsibilities under the International
Loan Agreement, as hereby amended). In addition, Borrower shall pay any and all
stamp and other taxes and fees payable or determined to be payable in
connection with the execution and delivery, filing or recording of this
Amendment and the other instruments and documents to be delivered hereunder and
agrees to save Bank harmless from and against any and all liabilities with
respect to or resulting from any delay in paying or omission to pay such taxes
or fees.

         SECTION 8. Governing Law. THIS AMENDMENT HAS BEEN NEGOTIATED, AND IS
BEING EXECUTED AND DELIVERED IN THE STATE OF TEXAS, AND THE SUBSTANTIVE LAWS OF
SUCH STATE AND THE APPLICABLE FEDERAL LAWS OF THE UNITED STATES SHALL GOVERN
THE VALIDITY, CONSTRUCTION, ENFORCEMENT AND INTERPRETATION OF ALL OF THE LOAN
DOCUMENTS.

         SECTION 9. Invalid Provisions. If any provision of this Amendment is
held to be illegal, invalid or unenforceable, such provision shall be fully
severable; this Amendment shall be construed and enforced as if such illegal,
invalid or unenforceable provision had never comprised a part of this
Amendment; and the remaining provisions of this Amendment shall remain in full
force and effect and shall not be affected by the illegal, invalid or
unenforceable provision or by its severance from this Amendment.

         SECTION 10. Survival. All representations, warranties, conditions and
covenants made herein shall survive the execution and delivery of this
Amendment and the other International Loan Documents and the making of the
Loans, and no investigation by the Bank, nor any closing shall affect the
representations, warranties, conditions and covenants of the Borrowers or the
right of the Bank to rely on and enforce them.

         SECTION 11. Waiver. The execution, delivery and effectiveness of this
Amendment shall not operate as a waiver of any right, power or remedy of Bank
under the International Loan Agreement, as amended by this Amendment, the Note,
or any other International Loan Documents or the Domestic Loan Documents to
which Borrower is a party, as each may be amended or modified from time to
time, nor constitute a waiver of any other provision of the foregoing documents
and instruments, as each may be amended or modified from time to time.

         SECTION 12. Further Assurances. Borrower agrees to do, execute,
acknowledge and deliver all and every such further acts and instruments as Bank
may request for the better assuring and confirming unto Bank all and singular
the rights granted or intended to be granted hereby or hereunder.

         SECTION 13. Multiple Counterparts. This Amendment may be executed in
any number of counterparts, all of which taken together shall constitute one
and the same agreement, and any of the parties hereto may execute this
Amendment by signing any such counterpart.


                                     - 6 -

<PAGE>   78



         SECTION 14. Assignment. The Bank may assign any of its rights and
interests in any of the International Loan Documents or Domestic Loan Documents
to Eximbank at any time, or from time to time, in the Bank's sole discretion
and without notice to the Borrowers.

         SECTION 15. Entirety. THIS WRITTEN AMENDMENT, THE INTERNATIONAL LOAN
AGREEMENT, THE NOTE, THE OTHER INTERNATIONAL LOAN DOCUMENTS, THE DOMESTIC LOAN
DOCUMENTS AND THE OTHER DOCUMENTS EXECUTED IN CONNECTION THEREWITH REPRESENT
THE FINAL AGREEMENT BETWEEN THE PARTIES RESPECTING THE SUBJECT MATTER HEREOF
AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT
ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN
THE PARTIES.


                                     - 7 -

<PAGE>   79


                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be executed by their respective officers thereunto duly
authorized, as of the date first above written.

                     NATIONAL TANK COMPANY


                     By: /s/ STEPHEN J. GOODLAND
                        -------------------------------------------
                     Name:  Stephen J. Goodland
                          -----------------------------------------
                     Title: Vice President - Finance and Accounting
                           ----------------------------------------


                     TOTAL ENGINEERING SERVICES TEAM, INC.


                     By: /s/ STEPHEN J. GOODLAND
                        -------------------------------------------
                     Name:  Stephen J. Goodland
                          -----------------------------------------
                     Title:  Assistant Secretary
                           ----------------------------------------


                   CHASE BANK OF TEXAS, NATIONAL ASSOCIATION


                     By:
                        -------------------------------------------
                     Name:
                          -----------------------------------------
                     Title:
                           ----------------------------------------

THE UNDERSIGNED HEREBY CONSENTS TO
THIS AND ALL PRIOR AMENDMENTS TO THE
INTERNATIONAL LOAN DOCUMENTS AND
CONFIRMS THAT ITS INTERNATIONAL
GUARANTY IS AND REMAINS IN FULL
FORCE AND EFFECT

NATCO GROUP, INC. (formerly known as
Cummings Point Industries, Inc.)


By: /s/ STEPHEN J. GOODLAND
   -------------------------------------------
Name:  Stephen J. Goodland
     -----------------------------------------
Title: Vice President - Finance and Accounting
      ----------------------------------------

                                     - 8 -


<PAGE>   80
              AGREEMENT TO SATISFY EXIM "JUNIOR LIEN" REQUIREMENT

THIS AGREEMENT TO SATISFY EXIM "JUNIOR LIEN" REQUIREMENT (this "Agreement")
dated as of August 31, 1998, ("Effective Date") is made by and between NATIONAL
TANK COMPANY, a Delarware corporation (whether one or more, jointly and
severally, "Borrower"), and CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, a
national banking association ("Bank," formerly Texas Commerce Bank National
Association).

PRELIMINARY STATEMENTS. Borrower and Bank have entered into an International
Revolving Loan Agreement dated June 30, 1997 (as it may be amended or otherwise
modified from time to time, the "International Loan Agreement"), providing for
loans by Bank to Borrower under the Working Capital Guaranty Program ("WCGP")
of the Export-Import Bank of the United States ("the Eximbank"). Bank has
and/or may from time to time in its future discretion extend other loans and
other credit to Borrower (no commitment to extend any such credit being
evidenced by this Agreement) apart from the Eximbank guaranteed loans under the
International Loan Agreement ("Other Obligations").

All capitalized terms used but not otherwise defined in this Agreement shall
have the same meanings as in the International Loan Agreement.

The International Obligations and the Other Bank Obligations of Borrower to
Bank are secured by the International Security Agreements; and may also be
secured by one or more other security agreements, collateral assignments and
similar agreements executed and delivered by Borrower prior to and/or in
connection with this Agreement; and may also be secured by other such documents
and collateral executed and delivered by Borrower in the future ("Other
Collateral"); so that from time to time some or all collateral securing the
International Obligations may also secure the Other Obligations, and vice
versa.

Bank has advised Borrower that it is a condition of the WCGP that loans under
the WCGP "be collateralized by a junior lien on all of the Borrower's assets
securing the non-Eximbank guaranteed credit facility(ies)" extended by Bank to
Borrower.

The WCGP contemplates that upon Borrower's default with respect to the
International Obligations, the Eximbank's guaranty of such obligations if
called upon by Bank shall be honored by the Eximbank's acceptance of assignment
of such obligations from Bank, together with such rights in collateral securing
such obligations as provided for in the WCGP, in exchange for the Eximbank's
payment of the guaranteed portion of such obligations to Bank (the
"Assignment"); but in any event Bank also retaining after such Assignment its
own rights in all collateral securing Other Obligations and the unguaranteed
portion of the International Obligations, the priorities between the Eximbank
and Bank being determined in accordance with the requirements of the WCGP.

The parties therefore agree as follows:

1. Borrower agrees that in connection with the Assignment, Bank shall be
entitled to assign (whether by outright assignment, grant of a beneficial
interest or otherwise as Bank and Eximbank may mutually agree), and the
Eximbank shall be entitled to accept, receive and enforce, such interests in
the International Collateral and in the Other Collateral securing the
International Obligations immediately prior to such Assignment, as may be
agreed between the Eximbank and Bank subject to the requirements of the WCGP,
Bank's retained interests in such collateral, and such other agreements and
priorities as may be agreed by the Eximbank and Bank in connection with the
Assignment or otherwise.

2. Borrower will execute such other and further agreements, certificates,
filings, financing statements and other documents, and so such other acts and
things, as Bank and Eximbank (following any Assignment) may request to assure
all benefits contemplated by this Agreement are realized by Bank and Eximbank.

3. Borrower acknowledges and agrees that Bank's commitment to make Loans under
the International Loan Agreement; the making of each Loan thereunder; and
Bank's willingness in its discretion to extend credit creating Other
Obligations of Borrower from time to time, are and shall be premised on Bank's
continuing reliance on the guaranty of the International Obligations by
Eximbank under the WCGP; and that the agreements herein are in furtherance and
fulfillment of the requirements of the WCGP relied upon by the Eximbank in
providing such guaranty; so that the all of the Loans made under the
International Loan Agreement, and creation of any Other Bank Obligations from
time to time prior to any Assignment, are and shall continue to be understood
to be conditioned upon the execution and continued effectiveness of this
Agreement, and the full and timely performance of all of its terms.

4. No security interest, lien, or other interest granted by Borrower, any
guarantor or other person to Bank is released or limited in connection with the
execution of this Agreement. Borrower confirms and ratifies each of the liens,
security interests and other interests granted in each and all security
agreements executed in connection with, related to, or securing the
International Loan Agreement and each of the Other Obligations, each in
accordance with its stated terms.

5. This Agreement shall become effective as of its Effective Date upon
execution and delivery by each of the parties named in the signature lines
below. This Amendment shall be included within the definition of "International
Loan Documents" as used in the International Loan Agreement. This Amendment may
be executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which when so executed shall be deemed an
original and all of which taken together shall constitute but one and the same
agreement.

6. THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF TEXAS AND AS APPLICABLE, THE LAWS OF THE UNITED STATES OF
AMERICA.

THIS WRITTEN AMENDMENT AND THE OTHER LOAN DOCUMENTS CONSTITUTE A "LOAN
AGREEMENT" AS DEFINED IN SECTION 26.02(A) OF THE TEXAS BUSINESS & COMMERCE
CODE, AND REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed effective as of its Effective Date.

<TABLE>
<CAPTION>
BORROWER: NATIONAL TANK COMPANY                               BANK: CHASE BANK OF TEXAS, NATIONAL ASSOCIATION

<S>                                                           <C>
By:                                                           By:
   --------------------------------------------                  --------------------------------------------

Name:                                                         Name:
     ------------------------------------------                    ------------------------------------------

Title:                                                        Title:
      -----------------------------------------                     -----------------------------------------

Address:
        ---------------------------------------
</TABLE>


                                       1
<PAGE>   81


                              AMENDED AND RESTATED
                          INTERNATIONAL REVOLVING NOTE

$10,000,000.00                                                     July 23, 1999

                 FOR VALUE RECEIVED, the undersigned, NATIONAL TANK COMPANY, a
corporation organized under the laws of the State of Delaware and TOTAL
ENGINEERING SERVICES TEAM, INC., a Louisiana corporation (collectively, the
"Borrower"), HEREBY PROMISES TO PAY, jointly and severally, to the order of
CHASE BANK OF TEXAS, NATIONAL ASSOCIATION (formerly known as Texas Commerce
Bank National Association, a national banking association) (the "Bank"), on or
before July 23, 2002 (the "Maturity Date"), the principal sum of Ten Million
and 00/100 Dollars ($10,000,000.00), or, if less, the aggregate principal
amount of Loans outstanding on the Maturity Date, in accordance with the terms
and provisions of that certain International Revolving Loan Agreement dated as
of June 30, 1997 by and between the Borrower and the Bank (as amended from time
to time, the "International Loan Agreement"; capitalized terms used herein and
not otherwise defined herein shall have the meanings ascribed to such terms in
the International Loan Agreement).

                 The outstanding principal balance of this Note shall be due
and payable as provided in the International Loan Agreement.  The Borrower
promises to pay interest on the unpaid principal balance of this Note from the
date of any Loan evidenced by this Note until the principal balance thereof is
paid in full.  Interest shall accrue on the outstanding principal balance of
this Note from and including the date of any Loan evidenced by this Note to but
not including the Maturity Date at the rate or rates, and shall be due and
payable on the dates, set forth in the International Loan Agreement.  Any
amount not paid when due with respect to principal (whether at stated maturity,
by acceleration or otherwise), costs or expenses, or, to the extent permitted
by applicable law, interest, shall bear interest from the date when due to and
excluding the date the same is paid in full, payable on demand, at the Past Due
Rate.

                 Payments of principal and interest, and all amounts due with
respect to costs and expenses, shall be made in lawful money of the United
States of America in immediately available funds, without deduction, set-off or
counterclaim to the Bank, or such other location as may be notified to the
Borrower by the Bank, not later than 12:00 noon (Houston time) on the dates on
which such payments shall become due pursuant to the terms and provisions set
forth in the International Loan Agreement.

                 If any payment of principal or interest on this Note shall
become due on a Saturday, Sunday, or public holiday on which the Bank is not
open for business, such payment shall be made on the next succeeding Business
Day and such extension of time shall in such case be included in computing
interest in connection with such payment.

                 All loans and advances and all payments and prepayments made
hereon shall be recorded in the holder's records and such records shall be
controlling, absent manifest error.




                                     -1-
<PAGE>   82
                 In addition to all principal and accrued interest on this
Note, the Borrower agrees to pay (a) all reasonable costs and expenses incurred
by all owners and holders of this Note in collecting this Note through any
probate, reorganization, bankruptcy or any other proceeding and (b) reasonable
attorneys' fees when and if this Note is placed in the hands of an attorney for
collection after default.

                 All agreements among the Borrower and the Bank, whether now
existing or hereafter arising and whether written or oral, are hereby expressly
limited so that in no contingency or event whatsoever, whether by reason of
demand being made on this Note or otherwise, shall the amount paid, or agreed
to be paid, to the Bank for the use, forbearance, or detention of the money to
be loaned under the International Loan Agreement and evidenced by this Note or
otherwise or for the payment or performance of any covenant or obligation
contained in the International Loan Agreement, this Note or in any other
International Loan Document exceed the Highest Lawful Rate.  If, as a result of
any circumstances whatsoever, fulfillment of any provision hereof or of any of
such documents, at the time performance of such provision shall be due, shall
involve transcending the limit of validity prescribed by applicable usury law,
then, ipso facto, the obligation to be fulfilled shall be reduced to the limit
of such validity, and if, from any such circumstance, the Bank shall ever
receive interest or anything which might be deemed interest under applicable
law which would exceed the Highest Lawful Rate, such amount which would be
excessive interest shall be applied to the reduction of the principal amount
owing on account of this Note or the amounts owing on other obligations of the
Borrower to the Bank under any International Loan Document and not to the
payment of interest, or if such excessive interest exceeds the unpaid principal
balance of this Note and the amounts owing on other obligations of the Borrower
to the Bank under any International Loan Documents, as the case may be, such
excess shall be refunded to the Borrower.  All sums paid or agreed to be paid
to the Bank  for the use, forbearance, or detention of the indebtedness of the
Borrower to the Bank shall, to the extent permitted by applicable law, be
amortized, prorated, allocated, and spread throughout the full term of such
indebtedness until payment in full of the principal thereof (including the
period of any renewal or extension thereof) so that the interest on account of
such indebtedness shall not exceed the Highest Lawful Rate.  Notwithstanding
anything to the contrary contained in the International Loan Agreement or this
Note, it is understood and agreed that if at any time the rate of interest
which accrues on the outstanding principal balance of this Note shall exceed
the Highest Lawful Rate, the rate of interest which accrues on the outstanding
principal balance of this Note shall be limited to the Highest Lawful Rate, but
any subsequent reductions in the rate of interest which accrues on the
outstanding principal balance of this Note shall not reduce the rate of
interest which accrues on the outstanding principal balance of this Note below
the Highest Lawful Rate until the total amount of interest accrued on the
outstanding principal balance of this Note equals the amount of interest which
would have accrued if such interest rate had at all times been in effect.  The
terms and provisions of this paragraph shall control and supersede every other
provision of all agreements between the Borrower and the Bank.

                 This Note is entitled to the benefits of the International
Loan Agreement, which International Loan Agreement, among other things,
contains provisions for acceleration of the maturity hereof upon the happening
of certain stated events, for prepayments on account of principal





                                     -2-
<PAGE>   83
hereof prior to the maturity hereof upon the terms and conditions and with the
effect therein specified, and provisions to the effect that no provision of the
International Loan Agreement or this Note shall require the payment or permit
the collection of interest in excess of the Highest Lawful Rate.  The
obligations of the Borrower hereunder are secured by the International Security
Documents.  It is contemplated that by reason of prepayments or repayments
hereon prior to the Maturity Date, there may be times when no indebtedness is
owing hereunder prior to such date, but notwithstanding such occurrences, this
Note shall remain valid and shall be in full force and effect as to Loans made
pursuant to the International Loan Agreement subsequent to each such
occurrence.

                 Except as otherwise specifically provided for in the
International Loan Agreement, the Borrower and any and all endorsers,
guarantors and sureties severally waive grace, demand, presentment for payment,
notice of dishonor or default, protest, notice of protest, notice of intent to
accelerate, notice of acceleration and diligence in collecting and bringing of
suit against any party hereto, and agree to all renewals, extensions or partial
payments hereon, with or without notice, before or after maturity.

                 THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAWS OF THE STATE OF TEXAS AND APPLICABLE FEDERAL LAW.

                 THIS NOTE AND THE OTHER INTERNATIONAL LOAN DOCUMENTS REPRESENT
THE FINAL AGREEMENT AMONG THE PARTIES AS TO THE SUBJECT MATTER HEREOF AND
THEREOF AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES; AND THERE ARE NO UNWRITTEN ORAL
AGREEMENTS AMONG THE PARTIES.

                 IN WITNESS WHEREOF, the Borrower has caused this Note to be
executed and delivered by its officer thereunto duly authorized effective as of
the date first above written.

                                        NATIONAL TANK COMPANY


                                        By:
                                           ------------------------------------
                                        Name:
                                             ----------------------------------
                                        Title:
                                              ---------------------------------

                                        TOTAL ENGINEERING SERVICES TEAM, INC.


                                        By:
                                           ------------------------------------
                                        Name:
                                             ----------------------------------
                                        Title:
                                              ---------------------------------




                                     -3-






<PAGE>   1



                                                                   EXHIBIT 10.24

                       NONSTATUTORY STOCK OPTION AGREEMENT

     AGREEMENT made as of the ____ day of _____, 19__, between NATCO GROUP INC.,
a Delaware corporation (the "Company" and ________________ ("Employee").

     To carry out the purposes of the NATCO GROUP INC. EMPLOYEE STOCK INCENTIVE
PLAN (the "Plan"), by affording Employee the opportunity to purchase shares of
common stock of the Company ("Stock"), and in consideration of the mutual
agreements and other matters set forth herein and in the Plan, the Company and
Employee hereby agree as follows:

1. SURRENDER AND EXCHANGE OF PRIOR OPTION. Pursuant to a Nonstatutory Stock
Option Agreement between Employee and the Company dated JUNE 30,1998 (the "PRIOR
OPTION AGREEMENT"), Employee was granted an option (the "PRIOR OPTION") to
purchase a number of shares of Stock equal to the number listed in Paragraph 2
below under the Plan at an exercise price per share as indicated in the Prior
Option Agreement. Employee and the Company agree that the Prior Option Agreement
and the Prior Option shall be void and of no further force and effect and will
be surrendered and relinquished by Employee and canceled by the Company. In
exchange for the surrender, relinquishment and cancellation of the Prior Option,
the Company has granted Employee an option under the Plan which shall be
governed by the Plan and the terms and conditions set forth in this Agreement.

2. GRANT OF OPTION. The Company hereby irrevocably grants to Employee the right
and option ("Option") to purchase all or any part of an aggregate of 40,000
shares of Stock, on the terms and conditions set forth herein and in the Plan,
which Plan is incorporated herein by reference as a part of this Agreement. This
Option shall not be treated as an incentive stock option within the meaning of
section 422(b) of the Internal Revenue Code of 1986, as amended (the "Code).

3. PURCHASE PRICE. The purchase price of Stock purchased pursuant to the
exercise of this Option shall be $8.81.

4. EXERCISE OF OPTION. Subject to the earlier expiration of this Option as
herein provided, this Option may be exercised, by written notice to the Company
at its principal executive office addressed to the attention of its Chief
Executive Officer, at any time and from time to time after the date of grant
hereof, but, except as otherwise provided below, this Option shall not be
exercisable for more than a percentage of the aggregate number of shares offered
by this Option determined by the number of full years from the date of the Prior
Option Agreement to the date of such exercise, in accordance with the following
schedule:


<PAGE>   2


<TABLE>
<CAPTION>
                                                     PERCENTAGE OF SHARES
    NUMBER OF FULL YEARS BEGINNING 6/30/98           THAT MAY BE PURCHASED
    --------------------------------------           ---------------------

<S>                                                          <C>
           Less than 1 year                                    0%
                     1 year                                   25%
                     2 years                                  50%
                     3 years                                  75%
                     4 years or more                         100%

</TABLE>

     This Option may be exercised only while Employee remains an employee of the
Company and will terminate and cease to be exercisable upon Employee's
termination of employment with the Company, except that:

     (a) If Employee's employment with the Company terminates by reason of
     disability (within the meaning of section 22(e)(3) of the Code), this
     Option may be exercised in full by Employee (or Employee's estate or the
     person who acquires this Option by will or the laws of descent and
     distribution or otherwise by reason of the death of Employee) at any time
     during the period of one year following such termination.

     (a) If Employee dies while in the employ of the Company, Employee's
     estate, or the person who acquires this Option by will or the laws of
     descent and distribution or otherwise by reason of the death of Employee,
     may exercise this Option in full at any time during the period of one year
     following the date of Employee's death.

     (a) If Employee's employment with the Company terminates for any reason
     other than as described in (a) or (b) above, unless Employee voluntarily
     terminates such employment or such employment is terminated for cause, this
     Option may be exercised by Employee at any time during the period of three
     months following such termination, or by Employee's estate (or the person
     who acquires this Option by will or the laws of descent and distribution or
     otherwise by reason of the death of Employee) during a period of one year
     following Employee's death if Employee dies during such three-month period,
     but in each case only as to the number of shares Employee was entitled to
     purchase hereunder upon exercise of this Option as of the date Employee's
     employment so terminates. The Committee appointed by the Board of Directors
     of the Company to administer the Plan (the "Committee") may, in its sole
     discretion, advise Employee in writing, prior to a voluntary termination of
     Employee's employment, that such termination will be treated for purposes
     of this paragraph as an involuntary termination for a reason other than
     cause. As used in this paragraph, the term "cause" shall mean Employee's
     gross negligence or willful misconduct in performance of the duties of
     Employee's employment, or Employee's final conviction of a felony or of a
     misdemeanor involving moral turpitude.

                                       -2-

<PAGE>   3


This Option shall not be exercisable in any event after the expiration of ten
years from the date of grant hereof. Except as provided in Paragraph 4, the
purchase price of shares as to which this Option is exercised shall be paid in
full at the time of exercise (a) in cash (including check, bank draft or money
order payable to the order of the Company), (b) by delivering to the Company
shares of Stock having a fair market value equal to the purchase price, (c) any
combination of cash or Stock, or (d) in a broker-financed "cashless exercise"
pursuant to the procedures established by the Committee. No fraction of a share
of Stock shall be issued by the Company upon exercise of an Option or accepted
by the Company in payment of the purchase price thereof, rather, Employee shall
provide a cash payment for such amount as is necessary to effect the issuance
and acceptance of only whole shares of Stock. Unless and until a certificate or
certificates representing such shares shall have been issued by the Company to
Employee, Employee (or the person permitted to exercise this Option in the event
of Employee's death) shall not be or have any of the rights or privileges of a
shareholder of the Company with respect to shares acquirable upon an exercise
of this Option.

5. WITHHOLDING OF TAX. To the extent that the exercise of this Option or the
disposition of shares of Stock acquired by exercise of this Option results in
compensation income to Employee for federal or state income tax purposes,
Employee shall deliver to the Company at the time of such exercise or
disposition such amount of money or shares of Stock as the Company may require
to meet its obligation under applicable tax laws or regulations, and, if
Employee fails to do so, the Company is authorized to withhold from any cash or
Stock remuneration then or thereafter payable to Employee any tax required to be
withheld by reason of such resulting compensation income. Upon an exercise of
this Option, the Company is further authorized in its discretion to satisfy any
such withholding requirement out of any cash or shares of Stock distributable to
Employee upon such exercise.

6. STATUS OF STOCK. Employee understands that at the time of the execution of
this Agreement the shares of Stock to be issued upon exercise of this Option
have not been registered under the Securities Act of 1933, as amended (the
"Act), or any state securities law, and that the Company does not currently
intend to effect any such registration. Until the shares of Stock acquirable
upon the exercise of the Option have been registered for issuance under the Act,
the Company will not issue such shares unless the holder of the Option provides
the Company with a written opinion of legal counsel, who shall be satisfactory
to the Company, addressed to the Company and satisfactory in form and substance
to the Company's counsel, to the effect that the proposed issuance of such
shares to such Option holder may be made without registration under the Act. In
the event exemption from registration under the Act is available upon an
exercise of this Option, Employee (or the person permitted to exercise this
Option in the event of Employee's death), if requested by the Company to do so,
will execute and deliver to the Company in writing an agreement containing such
provisions as the Company may require to assure compliance with applicable
securities laws.

                                      -3-

<PAGE>   4


     Employee agrees that the shares of Stock which Employee may acquire by
exercising this Option shall be acquired for investment without a view to
distribution, within the meaning of the Act, and shall not be sold, transferred,
assigned, pledged or hypothecated in the absence of an effective registration
statement for the shares under the Act and applicable state securities laws or
an applicable exemption from the registration requirements of the Act and any
applicable state securities laws. Employee also agrees that the shares of Stock
which Employee may acquire by exercising this Option will not be sold or
otherwise disposed of in any manner which would constitute a violation of any
applicable securities laws, whether federal or state.

     In addition, Employee agrees (i) that the certificates representing the
shares of Stock purchased under this Option may bear such legend or legends as
the Committee deems appropriate in order to assure compliance with applicable
securities laws, (ii) that the Company may refuse to register the transfer of
the shares of Stock purchased under this Option on the stock transfer records of
the Company if such proposed transfer would in the opinion of counsel
satisfactory to the Company constitute a violation of any applicable securities
law and (iii) that the Company may give related instructions to its transfer
agent, if any, to stop registration of the transfer of the shares of Stock
purchased under this Option.

7. EMPLOYMENT RELATIONSHIP. For purposes of this Agreement Employee shall be
considered to be in the employment of the Company as long as Employee remains an
employee of either the Company, a parent or subsidiary corporation (as defined
in section 424 of the Code) of the Company, or a corporation or a parent or
subsidiary of such corporation assuming or substituting a new option for this
Option. Any question as to whether and when there has been a termination of such
employment, and the cause of such termination, shall be determined by the
Committee, and its determination shall be final.

8. BINDING EFFECT. This Agreement shall be binding upon and inure to the benefit
of any successors to the Company and all persons lawfully claiming under
Employee.

9. GOVERNING LAW. This Agreement shall be governed by, and construed in
accordance with, the laws of the State of Texas.

                                       -4-

<PAGE>   5


     IN WITNESS WHEREOF, the Company has caused this Agreement to be duly
executed by its officer thereunto duly authorized, and Employee has executed
this Agreement, all as of the day and year first above written.



                                       NATCO GROUP INC.

                                       BY:
                                           -------------------------------------
                                    TITLE:



                                           -------------------------------------
                                                        EMPLOYEE

                                       -5-


<PAGE>   1
                                                                    EXHIBIT 21.1


         The following companies will constitute all of the subsidiaries of the
Registrant as of the consummation of this offering:


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                                  STATE OR OTHER JURISDICTION OF
           SUBSIDIARY                             INCORPORATION OR ORGANIZATION
- --------------------------------------------------------------------------------
<S>                                               <C>
National Tank Company (1)                                  Delaware
- --------------------------------------------------------------------------------
NTC Technical Services, Inc. (1)                           Delaware
- --------------------------------------------------------------------------------
NATCO (U.K.) Ltd. (2)                                      United Kingdom
- --------------------------------------------------------------------------------
The Cynara Company (3)                                     Delaware
- --------------------------------------------------------------------------------
NATCO Oilfield Construction, Inc. (3)                      California
- --------------------------------------------------------------------------------
Oilfield Construction Company, Inc. (4)                    California
- --------------------------------------------------------------------------------
NATCO Japan Company, Ltd. (5)                              Japan
- --------------------------------------------------------------------------------
National Tank Company S.A. (3)                             Venezuela
- --------------------------------------------------------------------------------
NATCO Canada, Ltd. (3)                                     Canada
- --------------------------------------------------------------------------------
NATCO London, Inc. (3)                                     Delaware
- --------------------------------------------------------------------------------
Total Engineering Services Team, Inc. (3)                  Louisiana
- --------------------------------------------------------------------------------
TEST, Inc. (6)                                             Louisiana
- --------------------------------------------------------------------------------
TEST International (6)                                     Cayman Islands
- --------------------------------------------------------------------------------
TPS Nigeria Ltd. (7)                                       Nigeria
- --------------------------------------------------------------------------------
TEST Saudi Arabia Ltd. (7)                                 Saudi Arabia
- --------------------------------------------------------------------------------
</TABLE>

(1)      Wholly-owned subsidiary of the Registrant
(2)      99%-owned subsidiary of [NATCO Holdings, Inc.
(3)      Wholly-owned subsidiary of National Tank Company
(4)      Wholly-owned subsidiary of NATCO Oilfield Construction, Inc.
(5)      85%-owned subsidiary of National Tank Company
(6)      Wholly-owned subsidiary of Total Engineering Services Team, Inc.
(7)      50%-owned subsidiary of Total Engineering Services Team, Inc.

<PAGE>   1


                                                                    EXHIBIT 23.1

                          INDEPENDENT AUDITORS' CONSENT




The Board of Directors
NATCO Group Inc.

We consent to the use of our report dated March 5, 1999, related to the
consolidated financial statements of NATCO Group Inc. as of March 31, 1998 and
December 31, 1998, and for each of the years in the two year period ended March
31, 1998, and the nine month period ended December 31, 1998, included herein,
and the reference to our firm under the heading "Experts" in the Prospectus.


/s/ KPMG LLP

Houston, Texas
September 30, 1999

<PAGE>   1


                                                                   EXHIBIT 23.2


                         INDEPENDENT AUDITORS' CONSENT



The Board of Directors
Engineering Specialties, Inc. and
  Engineering Specialties FSC, Inc.


We consent to the use of our report dated September 24, 1999, related to the
combined financial statements of Engineering Specialties, Inc. and Engineering
Specialties FSC, Inc. (ESI) as of and for the year ended December 31, 1998,
included herein, and the reference to our firm under the heading "Experts" in
the Prospectus.

/s/ KPMG LLP

New Orleans, Louisiana
September 30, 1999


<PAGE>   1


                                                                   EXHIBIT 23.3

                          INDEPENDENT AUDITORS' CONSENT




The Board of Directors
Porta-Test International Inc.

We consent to the use of our reports dated September 17, 1999, related to the
financial statements of Porta-Test International Inc. as of and for the year
ended June 30, 1999, included herein, and the reference to our firm under the
heading "Experts" in the Prospectus.

/s/ KPMG LLP

Houston, Texas
September 30, 1999

<PAGE>   1
                                                                    EXHIBIT 23.4

                        CONSENT OF INDEPENDENT AUDITORS

We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated February 27, 1998, except for Note 15, as to which the
date is May 29, 1998, with respect to the financial statements of The Cynara
Company included in Amendment No. 2 to the Registration Statement (Form S-1 No.
333-48851) and related Prospectus of NATCO Group Inc. for the registration of
its common stock.

/s/ Ernst & Young LLP

Houston, Texas
September 28, 1999

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998
<PERIOD-START>                             JAN-01-1999             APR-01-1998
<PERIOD-END>                               JUN-30-1999             DEC-31-1998
<CASH>                                           1,428                   3,263
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   35,768                  43,164
<ALLOWANCES>                                       560                     579
<INVENTORY>                                     19,731                  22,254
<CURRENT-ASSETS>                                62,873                  74,602
<PP&E>                                          29,948                  28,282
<DEPRECIATION>                                  11,828                   9,988
<TOTAL-ASSETS>                                 105,468                 118,412
<CURRENT-LIABILITIES>                           32,701                  43,136
<BONDS>                                         39,065                  41,777
                                0                       0
                                          0                       0
<COMMON>                                            91                      91
<OTHER-SE>                                      24,247                  24,099
<TOTAL-LIABILITY-AND-EQUITY>                   105,468                 118,412
<SALES>                                         86,175                 145,611
<TOTAL-REVENUES>                                86,175                 145,611
<CGS>                                           65,821                 115,521
<TOTAL-COSTS>                                   65,821                 115,521
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               1,574                   1,988
<INCOME-PRETAX>                                    625                   1,260
<INCOME-TAX>                                       479                     608
<INCOME-CONTINUING>                                146                     652
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       146                     652
<EPS-BASIC>                                       0.02                    0.08
<EPS-DILUTED>                                     0.01                    0.07


</TABLE>


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