ERC INDUSTRIES INC /DE/
10-Q, 1998-08-14
OIL & GAS FIELD MACHINERY & EQUIPMENT
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                   FORM 10-Q

(Mark One)

[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
ACT OF 1934

For the quarter ended June 30, 1998

[_]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934

For the transition period from _________ to _________

Commission File No. 0-14439
                    -------


                             ERC INDUSTRIES, INC.
- -------------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)


     Delaware                                             76-0382879
     --------                                             ----------
(State or other jurisdiction of                   (I.R.S. Employer I.D. No.)
incorporation or organization)

1441 Park Ten Boulevard, Houston, Texas                                 77084
- ---------------------------------------                                -------
(Address of principal executive offices)                              (Zip Code)



                                (281) 398-8901
- -------------------------------------------------------------------------------
             (Registrant's telephone number, including area code)

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934
during the preceding 12 months (or for such shorter period that the Registrant
was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

 
                                 Yes   x   No 
                                     -----    ------      


Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.


            Class                             Outstanding at August 12, 1998
            -----                             ------------------------------
 Common stock, $0.01 par value                      27,498,272  shares
<PAGE>
 
                             ERC INDUSTRIES, INC.



                                     INDEX



                                                                     PAGE

PART I


FINANCIAL INFORMATION:


  Condensed Consolidated Balance Sheet -
     June 30, 1998 and December 31, 1997.............................  2

  Condensed Consolidated Statement of Operations
     Three and Six Months Ended June 30, 1998 and 1997...............  3

  Condensed Consolidated Statement of Shareholders' Equity
     Six Months Ended June 30, 1998..................................  4

  Condensed Consolidated Statement of Cash Flows
     Six Months Ended June 30, 1998 and 1997.........................  5

  Notes to Condensed Consolidated Financial Statements...............  6

  Management's Discussion and Analysis...............................  9

  Quantitative and Qualitative Disclosures about Market Risk......... 11


PART II

OTHER INFORMATION.................................................... 12

  Signature Page..................................................... 14
<PAGE>
 
                         Part I. FINANCIAL INFORMATION
                             ERC INDUSTRIES, INC.
                     CONDENSED CONSOLIDATED BALANCE SHEET
                   (in thousands, except for share amounts)
                                  (unaudited)
<TABLE> 
<CAPTION> 
                                                                           June 30,         December 31,
                                                                             1998               1997
                                                                          ---------         ------------
<S>                                                                       <C>                <C> 
ASSETS
Current assets:
  Cash and cash equivalents                                               $     315          $       -
  Trade accounts receivable, net of allowance for
   doubtful accounts of $672 and $681, respectively                          24,590             18,689
  Inventory                                                                  32,372             25,081
  Prepaid expenses and other current assets                                     285                229
  Deferred tax asset                                                          2,520              2,520
                                                                          ---------          ---------
      Total current assets                                                   60,082             46,519

Property, plant and equipment, net                                            8,788              7,743
Other assets                                                                  1,957              1,634
Deferred tax asset-noncurrent                                                   170                170
Excess cost over net assets acquired, net                                     5,373              4,317
                                                                          ---------          ---------

      Total assets                                                        $  76,370          $  60,383
                                                                          =========          =========
LIABILITIES AND SHAREHOLDERS' EQUITY

Current liabilities:
  Long-term debt and capital leases due within one year                   $  23,106          $   8,156
  Accounts payable                                                           10,643             11,587
  Other accrued liabilities                                                   3,612              4,761
                                                                          ---------          ---------
      Total current liabilities                                              37,361             24,504
                                                                          ---------          ---------

Long-term debt                                                                3,907              3,977

Commitments and contingencies                                                     -                  -

Shareholders' equity:
  Preferred stock, par value $1; authorized and
   unissued - 10,000,000 shares
  Common stock, par value $0.01; authorized - 30,000,000 shares;
   27,498,272 issued and outstanding                                            275                275
  Additional paid-in capital                                                 26,078             24,842
  Retained earnings from January 10, 1989                                     8,721              6,776
  Accumulated other comprehensive income                                         28                  9
                                                                          ---------          ---------
      Total shareholders' equity                                             35,102             31,902
                                                                          ---------          ---------

      Total liabilities and stockholders' equity                          $  76,370          $  60,383
                                                                          =========          =========
</TABLE> 

The accompanying notes are an integral part of the condensed consolidated 
financial statements.

                                      -2-
<PAGE>
 
                             ERC INDUSTRIES, INC.
                CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                   (in thousands, except for per share data)
                                  (unaudited)
<TABLE> 
<CAPTION> 
                                                        Three Months Ended             Six Months Ended
                                                              June 30,                     June 30,
                                                      -----------------------       -----------------------
                                                        1998           1997           1998           1997
                                                      --------       --------       --------       --------
<S>                                                   <C>            <C>            <C>            <C> 
Revenues                                              $ 28,355       $ 17,521       $ 55,981       $ 34,055
Cost of goods sold                                      20,412         13,504         40,718         26,082
                                                      --------       --------       --------       --------
  Gross profit                                           7,943          4,017         15,263          7,973

Selling, general and administrative expenses             6,142          3,416         11,228          6,852
                                                      --------       --------       --------       --------
Operating income                                         1,801            601          4,035          1,121
                                                      --------       --------       --------       --------
Other (income) expense:
  Interest expense                                         458            190            799            333
  Other, net                                               (21)           (11)           (95)            27
                                                      --------       --------       --------       --------
                                                           437            179            704            360
                                                      --------       --------       --------       --------

Income before provision for income taxes                 1,364            422          3,331            761

Provision for income taxes                                 619            174          1,386            293
                                                      --------       --------       --------       --------

Net income                                            $    745       $    248       $  1,945       $    468
                                                      ========       ========       ========       ========
Basic income per share                                $   0.03       $   0.01       $   0.07       $   0.02
                                                      ========       ========       ========       ========
Weighted average number of shares
  outstanding                                           27,498         21,498         27,498         21,248
                                                      ========       ========       ========       ========
</TABLE> 

The accompanying notes are an integral part of the condensed consolidated 
financial statements.


                                      -3-
<PAGE>
 
                             ERC INDUSTRIES, INC. 
           CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY
                                (IN THOUSANDS)

<TABLE> 
<CAPTION> 
                                                   COMMON STOCK           ADDITIONAL                   ACCUMULATED
                                              ------------------------     PAID-IN       RETAINED  OTHER COMPREHENSIVE
                                               SHARES        AMOUNT        CAPITAL       EARNINGS         INCOME
                                              ----------  ------------   -----------    ----------     ------------
<S>                                           <C>         <C>            <C>            <C>            <C> 
Balance as of December 31, 1997                 27,498         $275         $24,842        $6,776          $ 9
  Net income                                        --           --              --         1,945           --
  Foreign currency translation adjustment           --           --              --            --           19
  Income tax benefit of pre-quasi-
    reorganization net operations loss
    carryforwards                                   --           --           1,236            --           --
                                                ------         ----         -------        ------          ---
Balance as of June 30, 1998                     27,498          275          26,078         8,721           28
                                                ======         ====         =======        ======          ===



 
                  The accompanying notes are an integral part of the condensed consolidated financial statements.
</TABLE> 
                                      -4-

<PAGE>
 
                             ERC INDUSTRIES, INC.
                CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS
                                (in thousands)
                                  (unaudited)

<TABLE> 
<CAPTION> 
                                                                            Six Months Ended
                                                                                 June 30,
                                                                     ------------------------------
                                                                        1998                1997
                                                                     ----------          ----------
<S>                                                                  <C>                 <C> 
CASH FLOWS FROM OPERATING ACTIVITIES:

  Net cash used in operating activities, net of the effect
   of acquisitions                                                   $  (9,831)          $  (6,164)
                                                                     ----------          ----------
CASH FLOWS FROM INVESTING ACTIVITIES:      
  Acquisitions, net of cash acquired of $80                             (2,520)                  -
  Purchases of property, plant and equipment                            (1,387)               (578)
  Proceeds from sale of property, plant and equipment                       32                   6
                                                                     ----------          ----------
     Net cash used in investing activities                              (3,875)               (572)
                                                                     ----------          ----------
CASH FLOWS FROM FINANCING ACTIVITIES:

  Line of credit borrowings, net                                        14,558               7,111
  Principal payments on long-term debt and capital
   lease obligations                                                      (546)               (363)
                                                                     ----------          ----------
     Net cash provided by financing activities                          14,012               6,748
                                                                     ----------          ----------
Effect of exchange rate changes on cash                                      9                 (13)
                                                                     ----------          ----------
  Net increase (decrease) in cash and cash equivalents                     315                  (1)

  Cash and cash equivalents, beginning of period                             -                   1
                                                                     ----------          ----------
  Cash and cash equivalents, end of period                           $     315           $       - 
                                                                     ==========          ==========
</TABLE> 

The accompanying notes are an integral part of the condensed consolidated
financial statements.


                                      -5-
<PAGE>
 
                             ERC INDUSTRIES, INC.
             NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS


(1)  The  information contained herein with respect to June 30, 1998 and the
     three and six months ended June 30, 1998 and 1997, has not been audited but
     was prepared in conformity with the accounting principles and policies
     described in the ERC Industries, Inc. (the "Company") annual report 
     (Form 10-K) for the year ended December 31, 1997. Included are all
     adjustments (consisting of normal recurring adjustments) which, in the
     opinion of management, are necessary for a fair presentation of the
     financial information for the three and six months ended June 30, 1998 and
     1997. The results of interim periods are not necessarily indicative of
     results to be expected for the year.

(2)  Supplemental Cash Flow Information:

     The acquisition of Church Oil Tools, Inc. (see Note 3) was partially
     financed through $4 million of promissory notes to the sellers.

(3)  Acquisitions:

     On July 1, 1997, the Company acquired 100% of the issued and outstanding
     capital shares of Church Oil Tools, Inc. ("Church"), a company incorporated
     in Texas.  The business of Church is the manufacture of oilfield equipment.
     Church operates from a facility located in Houston, Texas.

     The Company paid a purchase price of $5 million.  The source of the funds
     for the purchase was approximately $1 million in cash on hand and $4
     million of promissory notes to the Sellers.

     On January 30, 1998, the Company entered into a definitive purchase
     agreement for the acquisition of Bompet, C.A. ("Bompet"), a Venezuelan
     company.  The acquisition was accomplished by the purchase of 100% of the
     issued and outstanding capital stock of Bompet.

     On January 30, 1998, the only remaining condition to completion of the
     acquisition of Bompet was the wire transfer of funds from the Company's
     bank to the seller.  This condition was met on February 2, 1998, the
     subsequent business day.

     Bompet is a Venezuelan based manufacturer of products used in the drilling
     and production segment of the Oil and Gas Industry.  Bompet sells wellheads
     and gate valves (and related assemblies) along with specialized services to
     oil and gas producers throughout Latin America.  Bompet has a facility in
     Cuidad Ojeda on the east side of Lake Maracaibo.  The Company plans to
     continue to operate Bompet as a subsidiary of the Company in substantially
     the same manner as it was operated prior to the acquisition.


                                      -6-
<PAGE>
 
     In connection with the transaction, the Company paid the sole Bompet
     stockholder, Inversiones Western C.A., a purchase price of $2.6 million.
     In addition, the Company will pay up to a maximum of $3.4 million in the
     event that Bompet's earnings exceed certain thresholds during 1998, 1999
     and 2000.

     The acquisition of Bompet was accounted for under the purchase method of
     accounting and the purchase price was allocated as follows (in thousands):

<TABLE>
<CAPTION>
 
 
          <S>                                         <C>
          Cash                                        $    80
          Accounts Receivable                           2,556
          Inventory                                     2,086
          Property, Plant and Equipment                   556
          Other Assets                                     15
          Excess Cost Over Net Assets Acquired            911
          Accounts Payable                             (1,438)
          Accrued Expenses                             (1,298)
          Long-Term Debt-Current and Non-Current         (868)
                                                      -------
                                                      $ 2,600
                                                      =======
 </TABLE>

     The operating results of Bompet and Church are included in operations from
     January 1, 1998 and July 1, 1997, respectively.  The following represents
     the pro-forma results of operations as if the acquisitions of Bompet and
     Church had occurred on January 1, 1997 (in thousands, except per share
     data):

<TABLE>
<CAPTION>
                                    Three Months Ended      Six Months Ended
                                      June  30, 1997          June 30, 1997
                                    -------------------     ----------------
          <S>                            <C>                     <C>
          Revenues                       21,125                  41,825
          Net income                        672                   2,570
          Basic income per share            .03                     .12
</TABLE>

(4)  Debt:

     The Company negotiated a new domestic $15.5 million line of credit with its
     bank in June 1998. The line has substantially the same terms as the
     Company's previous line of credit and expires on January 4, 1999. On 
     June 16, 1998, Wood Group Petroleum Services, Inc., a wholly owned
     subsidiary of Wood Group PLC, granted to the Company a new $5 million line
     of credit. The line provides for interest at an annual rate of the LIBOR
     rate plus 1%, which was 6.7% at June 30, 1998. This line of credit is
     uncollateralized and is due on demand.

(5)  Recent Accounting Pronouncements:

     In June 1997, the Financial Accounting Standards Board issued Statement of
     Financial Accounting Standards No. 130, Reporting Comprehensive Income
     ("SFAS No. 130").  SFAS No. 130 establishes standards for reporting and
     presentation of comprehensive income and



                                      -7-
<PAGE>
 
     its components. Comprehensive income is defined as the change in equity of
     a business enterprise during a period from transactions and other events
     and circumstances from nonowner sources and includes all changes in equity
     during a period except those resulting from investments by owners and
     distributions to owners. SFAS No. 130 is effective for the Company in 1998.
     Comprehensive income was $735,000, $2.0 million, $307,000 and $455,000 for
     the three and six months ended June 30, 1998 and 1997, respectively. Other
     comprehensive income consisted of the foreign currency translation
     adjustment for the three and six months ended June 30, 1998 and 1997.

     In June 1997, the Financial Accounting Standards Board issued Statement of
     Financial Accounting Standards No. 131, Disclosures about Segments of an
     Enterprise and Related Information ("SFAS No. 131").  SFAS No. 131
     establishes standards for reporting information about operating segments in
     annual financial statements and requires that those enterprises report
     selected information about operating segments in interim financial reports
     issued to shareholders.  SFAS No. 131 is effective for fiscal years
     beginning after December 15, 1997.  Adoption is not recognized for interim
     periods in the initial year of application.  Adoption of this statement
     will not have a material impact on the consolidated financial statements of
     the Company.



                                      -8-
<PAGE>
 
ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
          RESULTS OF OPERATIONS


Results of Operations

Industry wide, the average active domestic rig count as reported by Baker Hughes
Incorporated, a leading industry observer, was up 2.5% to 915 for the six months
ended June 30, 1998, compared with 893 for the six months ended June 30, 1997.
The average actual rig count for the six months ended June 30, 1998, as compared
to the six months ended December 31, 1997 declined 7.9% from 994  to 915.  The
average active rig count is an important indicator of activity levels in the
market in which the Company operates.

The Company's revenues increased by $10.9  million to $28.4  million for the
three months ended June 30, 1998, from $17.5 million for the three months ended
June 30, 1997.   In addition, the Company's six month revenues increased by
$21.9 million (64.4%) to $56 million for the six months ended June 30, 1998,
from $34.1 million for the six months ended June 30, 1997. The increase in
revenues is principally due to increased activity with existing customers as a
result of higher drilling activity, additional sales attributable to the
acquisition of Church and Bompet and increased international sales volume.

The gross profit for the three months ended June 30, 1998 increased by 
$3.9 million to $7.9 million from $4 million for the same period last year. The
gross profit for the six months ended June 30, 1998 increased by $7.3 million to
$15.3 million, from $8 million for the same period in 1997. Gross profit as a
percentage of sales were 28.0% and 27.3% for the three and six months ended
June 30, 1998 as compared with 22.9% and 23.4% for the three and six months
ended June 30, 1997, respectively. These increases were primarily due to
outsourcing of manufacturing at lower costs and change in product mix largely
arising from the acquisitions of Church and Bompet.

Selling, general and administrative expenses increased by $2.7 million for the
three months ended June 30, 1998 as compared with the same three month period
for 1997.  The same expenses increased by $4.3 million to $11.2 million for the
six months ended June 30, 1998 from $6.9 million for the six months ended
June 30, 1997. The primary reasons for the increase are the addition of Church
and Bompet and costs associated with international marketing efforts and
additional sales personnel. Selling, general and administrative expenses, as a
percentage of sales were 20.1% in the first six months of 1998, compared with
20.1% for the first six months of 1997. These expenses increased as a percentage
of sales from 19.5% in the three months ended June 30, 1997 to 21.7% for the 
three months ended June 30, 1998. This increase is primarily due to increased 
costs to pursue international acquisitions, manage current international 
operations and upgrade the Company's management information systems.

The Company generated operating income of $1.8 million and $4 million for the
three and six months ended June 30, 1998 compared with operating income of
$601,000 and $1.1 million for the three and six months ended June 30, 1997.  The
increase in operating income was due to increased sales volume and resulting
gross profit, which was only partially offset by increases in selling, general
and administrative expenses.

Other (income) expense increased by $258,000 for the three months ended June 30,
1998 over the same period in 1997.  Likewise, there was a $344,000 increase for
the six month period.  This was principally due to an increase in interest
expense as a result of higher borrowings from the Company's line of credit to
support higher inventory and receivables levels partially offset by favorable
currency translation adjustment relating to Bompet.


                                      -9-
<PAGE>
 
The provision for income taxes for the three and six months ended June 30, 1998
and 1997 resulted in an expense of $619,000, $1.4 million, $174,000 and
$293,000, respectively.  The effective tax rate increased from 38.5% in 1997 to
41.6% in 1998 primarily because of non-deductible goodwill amortization related 
to the Company's acquisition of Church Oil Tools and Bompet, C.A.


Liquidity and Capital Resources

The Company negotiated a new domestic $15.5 million line of credit with its bank
in June 1998. The line has substantially the same terms as the Company's
previous line of credit and expires on January 4, 1999.  On June 16, 1998, Wood
Group Petroleum Services, Inc., a wholly owned subsidiary of Wood Group PLC,
granted to the Company a new $5 million line of credit.  The line provides for
interest at an annual rate of the LIBOR rate plus 1%, which was 6.7% at
June 30, 1998.  This line of credit is uncollateralized and is due on demand.


Working capital increased by $706,000 to $22.7 million at June 30, 1998 compared
with $22 million at December 31, 1997. This improvement is primarily the result
of increases in accounts receivable and inventory resulting from higher sales 
activity and the acquisition of Bompet, that were only partially offset by 
increases in debt.

Pursuant to the Company's long-term debt agreements, approximately $23.1 million
in principal payments are due over the next twelve months.  The Company believes
its line of credit facility, combined with cash generated from operations, will
be adequate to fund its operations for at least the next twelve months.

The Company currently anticipates incurring capital expenditures of $3.1 million
principally for machinery and equipment, plant improvements and vehicle
purchases, through the fiscal year ended December 31, 1998.  The Company expects
to fund these expenditures from amounts available under the line of credit
facilities, cash provided by operations and/or capital lease transactions.


Recent Accounting Pronouncements

In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 131, Disclosures about Segments of an
Enterprise and Related Information ("SFAS No. 131").  SFAS No. 131 establishes
standards for reporting information about operating segments in annual financial
statements and requires that those enterprises report selected information about
operating segments in interim financial reports issued to shareholders.  SFAS
No. 131 is effective for fiscal years beginning after December 15, 1997.
Adoption is not recognized for interim periods in the initial year of
application.  Adoption of this statement will not have a material impact on the
consolidated financial statements of the Company.

Acquisition

On February 2, 1998, the Company completed the acquisition of all the issued and
outstanding capital stock of Bompet, a Venezuelan Company.  In connection with
the transaction, the Company paid the sole stockholder of Bompet, Inversiones
Western, C.A., a purchase price of $2.6 million.  In addition, the Company will
pay up to a maximum of $3.4 million in the event that Bompet's



                                      -10-
<PAGE>
 
earnings exceed certain thresholds during 1998, 1999 and 2000.


Cautionary Statement for Purposes of Forward-Looking Statements

Certain information contained in this Part I may be deemed to be forward-looking
statements within the meaning of The Private Securities Litigation Reform Act of
1995 and are subject to the "Safe Harbor" provision in that enacted legislation.
These statements are based on current expectations and involve a number of risks
and uncertainties.  Actual results could differ materially from those described
in the forward-looking statements as a result of various factors including, but
not limited to the following: the effects of acquisitions, expectations of
operating levels at the Company's facilities, expectations of the future
customer and product mix, retention of major customers, competition and the
Company's position in the market, discussions about future costs, the overall
oil and gas market and timing of capital expenditures.


Year 2000 Compliance

The Company has reviewed its computer systems and hardware to locate potential
operational problems associated with the year 2000 issue. The Company believes
that all year 2000 problems in its internal information processing computer
systems will be resolved and will not cause disruption of its operations, or
have a material adverse effect on its financial condition or results of
operations. The Company is in the process of contacting and receiving
verification of year 2000 issue compliance from its vendors, purchasers,
suppliers, customers and its financial service providers. At this time, the
Company does not anticipate material disruption in its operations as a result of
year 2000 compliance issues, but will continue to monitor the situation with
third parties.



ITEM 3.   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Not applicable.



                                     -11-
<PAGE>
 
                          Part II - OTHER INFORMATION


Item 1.  Legal Proceedings.
         ----------------- 

      The Company is involved in various claims and disputes in the normal
      course of its business.  Management of the Company believes the
      disposition of all such claims, individually or in the aggregate, will not
      have a material adverse effect on the Company's financial condition,
      results of operations or cash flows.


Item 2.  Changes in Securities.
         --------------------- 

      The Company's line of credit with Chase Bank of Texas, N.A. contains
      covenants that require the Company to maintain certain financial ratios
      and prohibit the Company from declaring or paying dividends.

      During the six months ended June 30, 1998, the Company made no
      unregistered sales of its equity securities.


Item 3.  Defaults Upon Senior Securities.
         ------------------------------- 

      Not applicable.


Item 4.  Submission of Matters to a Vote of Security Holders.
         --------------------------------------------------- 

      At the Company's Annual Meeting of Shareholders held on June 15, 1998, the
      shareholders of the Company re-elected to the Board of Directors, John
      Derek Prichard-Jones by a vote of 26,208,846 for and 80,017 withheld, and
      Anthony Howells by a vote of 26,279,997 shares for and 8,866 withheld.
      George W. Tilley and Allister G. Langlands continue serving in their
      capacity as directors.  The shareholders also ratified the appointment of
      PricewaterhouseCoopers LLP as the Company's independent public
      accountants for the fiscal year ending December 31, 1998 by a vote of
      26,137,062 shares in favor, 72,272 against, and 52,385 shares abstaining.


Item 5.  Other Information.
         ----------------- 

      None.


                                     -12-
<PAGE>
 
Item 6.  Exhibits and Reports on Form 8-K.
         -------------------------------- 

      (a)  Exhibits:
           10.1   Letter Agreement with Chase Bank of Texas, N.A. dated as of
                  June 30, 1998/1/.
           10.2   Letter Agreement with Wood Group Petroleum Services dated as
                  of June 16,1998/1/.
           27     Financial Data Schedule/1/.

      (b)  Reports on Form 8-K: None


- ---------------------------------------
           /1/   Filed herewith.






                                     -13-
<PAGE>
 
                                  SIGNATURES



Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.



Date: August 14, 1998                            ERC INDUSTRIES, INC.
                                       -----------------------------------------



                                          /s/ Wendell R. Brooks
                                       -----------------------------------------
                                                 Wendell R. Brooks
                                           President, Secretary & Director



                                          /s/ James E. Klima
                                       -----------------------------------------
                                                 James E. Klima
                                             Chief Financial Officer




                                     -14-

<PAGE>
 
                                                                    EXHIBIT 10.1


                      THIRD AMENDMENT TO LETTER AGREEMENT


THIS THIRD AMENDMENT TO LETTER AGREEMENT (this "Amendment") dated effective as
of June 30, 1998 (the "Effective Date"), is by and between ERC INDUSTRIES, INC.
("Borrower"), and CHASE BANK OF TEXAS, NATIONAL ASSOCIATION ("Bank").

PRELIMINARY STATEMENT.  Bank and Borrower are parties to a Letter Agreement
dated as of June 4, 1997, as amended by First Amendment as of January 30, 1998
and a Second Amendment dated as of April 8, 1998 ("Letter Agreement").  All
capitalized terms defined in the Letter Agreement and not otherwise defined
herein shall have the same meanings herein as in the Letter Agreement. Bank and
Borrower have agreed to amend the Letter Agreement to the extent set forth
herein in order to extend the maturity date of the Revolving Line of Credit.

NOW THEREFORE, in consideration of the premises and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged by
the parties hereto, Bank and Borrower hereby agree as follows:

1.  Revolving Line of Credit.  Section 1.1 of the Letter Agreement is amended by
substituting the following for the Section 1.1 of the Letter Agreement:

     "Section 1.1  REVOLVING LINE OF CREDIT

     A.   Advances:  The Bank agrees to make advances (an "Advance" or
          "Advances") to Borrower, upon request of Borrower from time to time
          from the Effective Date to but not including January 4, 1999 not to
          exceed at any one time outstanding the lesser of the Borrowing Base or
          $15,500,000.00, Borrower having the right to borrow, repay and
          reborrow.  Advances shall be used for the purpose of meeting the
          working capital requirements and general corporate purposes of
          Borrower.  Advances shall be evidenced by, and made as provided in a
          promissory note of even date herewith executed by Borrower and
          delivered to Bank ("Note"), a copy of which  is attached hereto as
          Exhibit "A" and made a part hereof for all purposes (the "Note" as
          used in this Agreement, shall include without limitation, any and all
          renewals, extensions, modifications, rearrangements, replacements
          thereof and substitutions therefor).

     B.   Letters of Credit:  The Bank agrees to issue standby and commercial
          letters of credit (an "L/C" or "L/Cs") from time to time, from the
          Effective Date to but not including January 4, 1999, for the account
          of Borrower and in favor of such person or persons as may be
          designated by Borrower.  Each L/C shall have an expiration date of no
          later than January 4, 2000.  The Borrower shall reimburse the Bank
          immediately upon demand for any drawings made under an L/C.  Prior to
          January 4, 1999, the Borrower may request an Advance under the Note,
          and the Bank is hereby authorized to make such an Advance without
          notice to the Borrower, to pay any drawing under any L/C.

     C.   Maximum Amount:  The maximum amount which will be available to
          Borrower under the Revolving Line of Credit is the lesser of the
          Borrowing Base or  $15,500,000.00 ("Maximum Amount"), which in
          determining whether any amounts are available under the Revolving Line
          of Credit, Bank will deduct from the Maximum Amount, the amount of all
          unpaid Advances (the outstanding principal balance on the Note) and
          all L/C Obligations.  The term "L/C Obligations" shall mean the face
          amount of all L/Cs issued and outstanding plus any unreimbursed
          drawings under the L/Cs plus any other amounts owing to Bank under or
          in respect of any L/C or Application (as hereinafter defined).
          Borrower and Bank agree that the following outstanding L/Cs shall be
          deemed made under and subject to the terms of this Agreement.

 
                              VALUE      EXPIRY                  
                NUMBER         DATE       DATE       AMOUNT      
                ----------   --------   --------   ----------    
                I455643      08/29/95   10/31/97   $ 2,820.00    
                I464024      08/12/96   05/09/97    10,000.00    
                I460191      03/05/96   08/30/96    10,000.00    
                I464760      09/16/96   09/30/98     1,648.00"      

2.  Section 1.6 of the Letter Agreement is amended by substituting the following
for the Section 1.6 of the Letter Agreement:

     "Section 1.6  MATURITY:  The Revolving Line of Credit shall expire:  (i) on
     January 4, 1999; or (ii) such earlier date resulting from acceleration as
     defined in Section 5. hereof."

3.  Exhibit A and Exhibit B of the Letter Agreement are hereby amended by
replacing the existing Exhibit A and Exhibit B with the Exhibit A and Exhibit B
attached hereto and hereby incorporated into this Amendment and the Letter
Agreement for all purposes.

4. Borrower hereby represents and warrants to the Bank that after giving effect
to the execution and delivery of this Amendment: (a) the representations and
warranties set forth in the Letter Agreement are true and correct on the date
hereof as though made on and as of such date; and (b) no Event of Default, or
event which with passage of time, the giving of notice or both would become an
Event of Default, has occurred and is continuing as of the date hereof.

5.  This Amendment shall become effective as of the Effective Date upon its
execution and delivery by each of the parties named in the signature lines
below, and the term "Agreement" as used in the Letter Agreement shall also refer
to the Letter Agreement as amended by this Amendment.

                                Page 1 of 2 Page
<PAGE>
 
Third Amendment to Letter Agreement
ERC Industries, Inc.
June 30, 1998


6. Borrower further acknowledges that each of the other Loan Documents,
including the Security Agreement, is in all other respects ratified and
confirmed, and all of the rights, powers and privileges created thereby or
thereunder are ratified, extended, carried forward and remain in full force and
effect except as the Letter Agreement is amended by this Amendment.

7.  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.

8.  This Amendment shall be included within the definition of "Loan Documents"
as used in the Agreement.

9.  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 Amendment to be
executed effective as of the Effective Date.

  BORROWER:                           ERC INDUSTRIES, INC.

                                      By:______________________________ 
                                      Name: ___________________________ 
                                      Title: __________________________ 


  BANK:                               CHASE BANK OF TEXAS, NATIONAL ASSOCIATION,
 
                                      By:______________________________
                                      Name: ___________________________
                                      Title: __________________________ 

                                Page 2 of 2 Page
<PAGE>
 
                                   EXHIBIT B
                             BORROWING BASE REPORT
                            ACCOUNTS AND INVENTORY

BORROWING BASE REPORT FOR PERIOD BEGINNING: ____________________  AND ENDING
____________________  ("CURRENT PERIOD") REQUIRED BY THE LETTER AGREEMENT DATED
JUNE 4, 1997 (AS AMENDED, RESTATED, AND SUPPLEMENTED FROM TIME TO TIME, THE
"AGREEMENT") BY AND BETWEEN ERC INDUSTRIES, INC. ("BORROWER") AND CHASE BANK OF
TEXAS, NATIONAL ASSOCIATION ("BANK")
 
THE BORROWING BASE REPORT MUST BE SUBMITTED TO BANK WITHIN 30 DAYS OF THE LAST
DAY OF EACH CALENDAR MONTH BORROWER MUST PROVIDE ALONG WITH THE BORROWING BASE
REPORT:  AN ACCOUNTS RECEIVABLE AGINGS AND LISTING.

<TABLE> 
<S>                                                                         <C>                  <C>                    <C> 
Line  1.  Total Accounts as of the end of the Current Period                                      $__________
          INELIGIBLE ACCOUNTS AS OF THE END OF THE CURRENT PERIOD:
      2.  That portion (e.g., invoice) of all of the Accounts
          of any Account Debtor where the Account is more than
          90 days from invoice date                                          $___________
      3.  All of the Accounts, not already included in Line 2,
          of any Account Debtor if 20% of the dollar amount of all
          of the Accounts of such Account Debtor are more than
          90 days from invoice date                                          $___________
      4.  That portion of all of the Accounts of any Account
          Debtor which exceeds 10% of the dollar amount of the
          total of all Accounts for all Account Debtors for
          the Current Period (Line 1)                                        $___________
      5.  Intercompany and Affiliate Accounts                                $___________
      6.  Government Accounts [GOVERNMENT ACCOUNTS MEANS
          RECEIVABLES OWED BY THE U.S. GOVERNMENT OR BY THE
          GOVERNMENT OF ANY STATE, COUNTY, MUNICIPALITY, OR
          OTHER POLITICAL SUBDIVISION AS TO WHICH BANK'S
          SECURITY INTEREST OR ABILITY TO OBTAIN DIRECT PAYMENT
          OF THE PROCEEDS IS GOVERNED BY ANY FEDERAL OR STATE
          STATUTORY REQUIREMENTS OTHER THAN THOSE OF THE UNIFORM
          COMMERCIAL CODE, INCLUDING, WITHOUT LIMITATION,
          THE FEDERAL ASSIGNMENT OF CLAIMS ACT OF 1940,
          AS AMENDED.]                                                       $__________   
      7.  Foreign Accounts (unless secured by a letter
          of credit issued by a bank satisfactory to the Bank, covered
          by Eximbank insurance or otherwise approved by Bank)               $__________
      8.  Accounts subject to any dispute or setoff or contra account        $__________
      9.  Other Ineligible Accounts                                          $__________
     10.  Total Ineligible Accounts for the Current Period                                                              $__________
          (Add Lines 2 through 9)                                                                 
     11.  Total Eligible Accounts for the Current Period                                                                $__________
          (Line 1 - Line 10)
     12.  Multiplied by: Accounts Advance Factor                                                                                 80%
     13.  Equals:  ACCOUNTS COMPONENT OF BORROWING BASE                                                                 $__________
     14.  Total Inventory as of the end of the Current Period                                                           $__________
          INELIGIBLE INVENTORY AS OF THE END OF THE CURRENT PERIOD:
     15.  Work in Process                                                    $__________
     16.  Private label                                                      $__________
     17.  Obsolete                                                           $__________
     18.  Returned/damaged                                                   $__________
     19.  Consigned/unowned                                                  $__________
     20.  Subject to Purchase Money Security Interest                        $__________
     21.  Slow moving                                                        $__________
     22.  Other Ineligible Inventory                                         $__________
     23.  Total Ineligible Inventory as of the end of the
          Current Period (Lines 15 + 16 + 17 + 18 + 19 + 20 + 21 + 22)                                                  $__________
     24.  Total Eligible Inventory as of the end of the
          Current Period (Line 14 - Line 23)                                                                            $__________
     25.  Multiplied by: Inventory Advance Factor                                                                                50%
     26.  Equals:  INVENTORY COMPONENT OF BORROWING BASE                                                                $__________
          (Not to exceed 50% of the Borrowing Base)
     27.  Total BORROWING BASE (not to exceed $15,500,000.00) as of
          the end of the Current Period (Line 13 + Line 26)                                       $_________
     28.  Less:  Aggregate principal amount outstanding under
          the Note as of the end of the Current Period                       $__________
     29.  Less:  Outstanding L/C Obligations as of the end of the
          Current Period                                                     $__________
     30.  Total Outstandings (Line 28 + Line 29)                                                                        $_________
     31.  Equals:  Amount available for borrowing subject to the terms of
          the Agreement, if positive; or amount due, if negative                                                        $__________

</TABLE> 

The terms "ACCOUNTS" and "INVENTORY" have the respective meanings as set forth
in the Texas Business and Commerce Code in effect as of the date of the
Agreement.  Inventory shall be valued at the lesser of: (a) market value; and
(b) cost.  "OTHER INELIGIBLE ACCOUNTS" mean all such Accounts of Borrower that
are not subject to a first and prior Lien in favor of Bank, those Accounts that
are subject to any Lien not in favor of Bank and those Accounts of Borrower as
shall be deemed from time to time to be, in the sole judgment of Bank,
ineligible for purposes of determining the Borrowing Base.  "OTHER INELIGIBLE
INVENTORY" means that Inventory of Borrower that is not subject to a first and
prior Lien in favor of Bank, that Inventory that is subject to any Lien not in
favor of Bank and that Inventory of Borrower as shall be deemed from time to
time to be in the sole judgment of Bank, ineligible for purposes of determining
the Borrowing Base.  All other terms not defined herein shall have the
respective meanings as in the Agreement.

Borrower certifies that the above information and computations are true,
correct, complete and not misleading as of the date hereof.

Borrower:     ERC INDUSTRIES, INC.

By:_____________________________________________________________________________
Name:___________________________________________________________________________
Title:__________________________________________________________________________
Address:________________________________________________________________________
Date:___________________________________________________________________________

                                Page 3 of 2 Page
<PAGE>
 
                                PROMISSORY NOTE
                                 (this "Note")
U.S. $15,500,000.00
                                                          June 30, 1998 ("Date")

FOR VALUE RECEIVED, ERC INDUSTRIES, INC., a Delaware corporation ("Borrower"),
promises to pay to the order of CHASE BANK OF TEXAS, NATIONAL ASSOCIATION,
formerly known as Texas Commerce Bank National Association ("Bank") on or before
January 4, 1999, (the "Termination Date"), at its banking house at 712 Main
Street, Houston, Harris County, Texas, or at such other location as Bank may
designate, in lawful money of the United States of America, the lesser of: (i)
the principal sum of FIFTEEN MILLION FIVE HUNDRED THOUSAND AND NO/100THS UNITED
STATES DOLLARS (U.S. $15,500,000.00); or (ii) the aggregate unpaid principal
amount of all loans made by Bank (each such loan being a "Loan"), which may be
outstanding on the Termination Date.  Each Loan shall be due and payable on the
maturity date agreed to by Bank and Borrower with respect to such Loan (the
"Maturity Date").  In no event shall any Maturity Date fall on a date after the
Termination Date.  Subject to the terms and conditions of this Note and the
Letter Agreement, Borrower may borrow, repay and reborrow all or any part of the
credit provided for herein at any time before the Termination Date, there being
no limitation on the number of Loans made so long as the total unpaid principal
amount at any time outstanding does not exceed the Maximum Loan Total.
Capitalized terms used but not otherwise defined herein shall have the meanings
assigned to them in the Letter Agreement.

"Adjusted LIBOR Rate" means a per annum interest rate determined by Bank by
dividing: (i) the LIBOR Rate by (ii) Statutory Reserves provided that Statutory
Reserves is greater than zero, otherwise Adjusted LIBOR Rate means a per annum
interest rate equal to the LIBOR Rate. "LIBOR Rate" means with respect to any
LIBOR Loan for any Interest Period the interest rate determined by Bank by
reference to the British Bankers' Association Interest Settlement Rates (as set
forth by any service selected by Bank which has been nominated by the British
Bankers' Association as an authorized information vender for the purpose of
displaying such rates including but not limited to Bloomberg, Reuters or
Telerate) to be the rate at approximately 11:00 a.m. London time, two Business
Days prior to the commencement of such Interest Period for dollar deposits in an
amount comparable to such LIBOR Loan with a maturity comparable to such Interest
Period.

"Board" means the Board of Governors of the Federal Reserve System of the United
States.

"Borrowing Date" means any Business Day on which Bank shall make  or continue a
Loan hereunder.

"Business Day" means a day: (i) on which Bank and commercial banks in New York
City are generally open for business; and (ii) with respect to LIBOR Loans, on
which dealings in United States Dollar deposits are carried out in the London
interbank market.

"Highest Lawful Rate" means the maximum nonusurious rate of interest from time
to time permitted by applicable law. If Texas law determines the Highest Lawful
Rate, Bank has elected the "indicated" (weekly) ceiling as defined in the Texas
Credit Code or any successor statute.  Bank may from time to time, as to current
and future balances, elect and implement any other ceiling under such Code
and/or revise the index, formula or provisions of law used to compute the rate
on this open-end account by notice to Borrower, if and to the extent permitted
by, and in the manner provided in such Code.

"Interest Period" means the period commencing on the Borrowing Date and ending
on the Maturity Date, consistent with the following provisions.  The duration of
each Interest Period shall be: (a) in the case of a Prime Rate Loan, a period of
up to the Termination Date unless any portion thereof is converted to a LIBOR
Loan hereunder; and (b) in the case of a LIBOR Loan, a period of up to one, two,
three or six months; in each case as selected by Borrower and agreed to by Bank.
Borrower's choice of Interest Period is subject to the following limitations:
(i) No Interest Period shall end on a date after the Termination Date; and (ii)
If the last day of an Interest Period would be a day other than a Business Day,
the Interest Period shall end on the next succeeding Business Day (unless the
Interest Period relates to a LIBOR Loan and the next succeeding Business Day is
in a different calendar month than the day on which the Interest Period would
otherwise end, in which case the Interest Period shall end on the next preceding
Business Day).

"Letter Agreement" means the Letter Agreement dated June 4, 1997 executed by the
Borrower and the Bank, as amended by a First Amendment dated January 30, 1998, a
Second Amendment dated as of April 8, 1998, and a Third Amendment dated as of
June 30, 1998 and as further amended from time to time.

"LIBOR Loan" means a Loan which bears interest at a rate determined by reference
to the Adjusted LIBOR Rate.

"Loan Documents" means this Note, the Letter Agreement and any document or
instrument evidencing, securing, guaranteeing or given in connection with this
Note.

"Maximum Loan Total" means (a) the lesser of (i) $15,500,000.00 or (ii) the
Borrowing Base less (b) L/C Obligations.

"Obligations" means all principal, interest and other amounts which are or
become owing under this Note or any other Loan Document.

"Obligor" means Borrower and any guarantor, surety, co-signer, general partner
or other person who may now or hereafter be obligated to pay all or any part of
the Obligations.

"Prime Rate" means the rate determined from time to time by Bank as its prime
rate.  The Prime Rate shall change automatically from time to time without
notice to Borrower or any other person.  THE PRIME RATE IS A REFERENCE RATE AND
MAY NOT BE BANK'S LOWEST RATE.

"Prime Rate Loan" means a Loan which bears interest at a rate determined by
reference to the Prime Rate.

"Statutory Reserves" means the difference (expressed as a decimal) of the number
one minus the aggregate of the maximum reserve percentages (including, without
limitation, any marginal, special, emergency, or supplemental reserves)
expressed as a decimal established by the Board and any other banking authority
to which Bank is subject to, with respect to the LIBOR Rate, for Eurocurrency
Liabilities (as defined in Regulation D of the Board).  Such reserve percentages
shall include, without limitation, those imposed under such Regulation D.  LIBOR
Loans shall be deemed to constitute Eurocurrency Liabilities and as such shall
be deemed to be subject to such reserve requirements without benefit of or
credit for proration, exceptions or offsets which may be available from time to
time to any bank under such Regulation D. Statutory Reserves shall be adjusted
automatically on and as of the effective date of any change in any reserve
percentage.

  Loans may be either Prime Rate Loans or LIBOR Loans. Borrower shall pay
interest on the unpaid principal amount of each Prime Rate Loan at a rate per
annum equal to the lesser of: (i) the Prime Rate in effect from time to time
minus three-quarters of one percent (3/4%) (the "Effective Prime Rate"); or (ii)
the Highest Lawful Rate.  Accrued interest on each Prime Rate Loan is due and
payable on October 4, 1998, on the date of any conversion to a LIBOR Loan and on
the Termination Date.  Borrower shall pay interest on the unpaid principal
amount of each LIBOR Loan for the Interest Period with respect thereto at a rate
per annum equal to the lesser of: (i) the Adjusted LIBOR Rate plus one percent
(1%) (the "Effective LIBOR Rate"); or (ii) the Highest Lawful Rate.  Accrued
interest on each LIBOR Loan is due on the last day of each Interest Period
applicable thereto, and in the case of an Interest Period in excess of three
months, on each day which occurs every three months after the initial date of
such Interest Period, and on any prepayment (on the amount prepaid).

  If at any time the effective rate of interest which would otherwise be payable
on any Loan evidenced by this Note exceeds the Highest Lawful Rate, the rate of
interest to accrue on the unpaid principal balance of such Loan during all such
times shall be limited to the Highest Lawful Rate, but any subsequent reductions
in such interest rate shall not become effective to reduce such interest rate
below the Highest Lawful Rate until the total amount of interest accrued on the
unpaid principal balance of such Loan equals the total amount of interest which
would have accrued if the Effective Prime Rate, or Effective LIBOR Rate,
whichever is applicable, had at all times been in effect.

  Each LIBOR Loan shall be in an amount not less than $150,000.00 and an
integral multiple of $50,000.00 in excess thereof.  Each Prime Rate Loan shall
be in an amount not less than $50,000.00 and an integral multiple of $50,000.00
in excess thereof.  Interest with respect to Prime Rate Loans shall be computed
on the basis of the actual number of days elapsed and a year comprised of:  365
(or 366 as the case may be) days.  Interest with respect to LIBOR Loans shall be
calculated on the basis of a 360 day year for the actual days elapsed, unless
such calculation would result in a usurious interest rate, in which case such
interest shall be calculated on the basis of a 365 or 366 day year, as the case
may be.

  The unpaid principal balance of this Note at any time will be the total
amounts advanced by Bank, less the amount of all payments or prepayments of
principal.  Absent manifest error, the records of Bank will be conclusive as to
amounts owed.  Loans shall be made on Borrower's irrevocable notice to Bank,
given not later than 10:00 A.M. (Houston time) on, in the case of LIBOR Loans,
the third Business Day prior to the proposed Borrowing Date or, in the case of
Prime Rate Loans, the first Business Day prior to the proposed Borrowing Date.
Each notice of a requested borrowing (a "Notice of Requested Borrowing") under
this paragraph may be oral or written, and shall specify: (i) the requested
amount; (ii) proposed Borrowing Date; (iii) whether the requested Loan is to be
a Prime Rate Loan or LIBOR Loan; and (iv) Interest 


                               Page 1 of 3 Pages
<PAGE>
 
Promissory Note
ERC INDUSTRIES, INC.
June 30, 1998 ("Date")


Period for the LIBOR Loan. If any Notice of Requested Borrowing shall be oral,
Borrower shall deliver to Bank prior to the Borrowing Date a confirmatory
written Notice of Requested Borrowing.

  Borrower may on any Business Day prepay the outstanding principal amount of
any Prime Rate Loan, in whole or in part.  Partial prepayments shall be in an
aggregate principal amount of $50,000.00 or a greater integral multiple of
$50,000.00.  Borrower shall have no right to prepay any LIBOR Loan.

  Provided that no Event of Default has occurred and is continuing, Borrower may
elect to continue all or any part of any LIBOR Loan beyond the expiration of the
then current Interest Period relating thereto by providing Bank at least three
Business Day's written or telecopy notice of such election, specifying the Loan
or portion thereof to be continued and the Interest Period therefor and whether
it is to be a Prime Rate Loan or LIBOR Loan provided that any continuation as a
LIBOR Loan shall not be less than $150,000.00 and shall be in an integral
multiple of $50,000.00.  If an Event of Default shall have occurred and be
continuing, the Borrower shall not have the option to elect to continue any such
LIBOR Loan or to convert Prime Rate Loans into LIBOR Loans.  Provided that no
Event of Default has occurred and is continuing, Borrower may elect to convert
any Prime Rate Loan at any time or from time to time to a LIBOR Loan by
providing Bank at least three Business Day's written or telecopy notice of such
election, specifying each Interest Period therefor.  Any conversion of Prime
Rate Loans shall not result in a borrowing of LIBOR Loans in an amount less than
$150,000.00 and in integral multiples of $50,000.00.

  If at any time Bank determines in good faith (which determination shall be
conclusive) that any change in any applicable law, rule or regulation or in the
interpretation, application or administration thereof makes it unlawful, or any
central bank or other governmental authority asserts that it is unlawful, for
Bank or its foreign branch or branches to maintain any LIBOR Loan by means of
dollar deposits obtained in the London interbank market (any of the above being
described as a "LIBOR Event"), then, at the option of Bank, the aggregate
principal amount of all LIBOR Loans outstanding shall be prepaid; however the
prepayment may be made at the sole option of the Bank with a Prime Rate Loan.
Upon the occurrence of any LIBOR Event, and at any time thereafter so long as
such LIBOR Event shall continue, the Bank may exercise its aforesaid option by
giving written notice thereof to Borrower.

  If Bank determines after the date of this Note that any change in applicable
laws, rules or regulations regarding capital adequacy, or any change in the
interpretation or administration thereof by any appropriate governmental agency,
or compliance with any request or directive to Bank regarding capital adequacy
(whether or not having the force of law) of any such agency, increases the
capital required to be maintained with respect to any Loan and therefore reduces
the rate of return on Bank's capital below the level Bank could have achieved
but for such change or compliance (taking into consideration Bank's policies
with respect to capital adequacy), then Borrower will pay to Bank from time to
time, within 15 days of Bank's request, any additional amount required to
compensate Bank for such reduction.  Bank will request any additional amount by
delivering to Borrower a certificate of Bank setting forth the amount necessary
to compensate Bank.  The certificate will be conclusive and binding, absent
manifest error.  Bank may make any assumptions, and may use any allocations of
costs and expenses and any averaging and attribution methods, which Bank in good
faith finds reasonable.

  If any domestic or foreign law, treaty, rule or regulation (whether now in
effect or hereinafter enacted or promulgated, including Regulation D of the
Board) or any interpretation or administration thereof by any governmental
authority charged with the interpretation or administration thereof (whether or
not having the force of law): (a) changes, imposes, modifies, applies or deems
applicable any reserve, special deposit or similar requirements in respect of
any Loan or against assets of, deposits with or for the account of, or credit
extended or committed by, Bank; or (b) imposes on Bank or the interbank
eurocurrency deposit and transfer market or the market for domestic bank
certificates or deposit any other condition affecting any such Loan; and the
result of any of the foregoing is to impose a cost to Bank of agreeing to make,
funding or maintaining any such Loan or to reduce the amount of any sum
receivable by Bank in respect of any such Loan, then Bank may notify Borrower in
writing of the happening of such event and Borrower shall upon demand pay to
Bank such additional amounts as will compensate Bank for such costs as
determined by Bank.  Without prejudice to the survival of any other agreement of
Borrower under this Note, the obligations of Borrower under this paragraph shall
survive the termination of this Note.

  Borrower will indemnify Bank against, and reimburse Bank on demand for, any
loss, cost or expense incurred or sustained by Bank (including without
limitation any loss, cost or expense incurred by reason of the liquidation or
reemployment of deposits or other funds acquired by Bank to fund or maintain
LIBOR Loans) as a result of: (a) any payment or prepayment (whether permitted by
Bank or required hereunder or otherwise) of all or a portion of any LIBOR Loan
on a day other than the Maturity Date of such Loan; (b) any payment or
prepayment, whether required hereunder or otherwise, of any LIBOR Loan made
after the delivery of a Notice of Requested Borrowing but before the applicable
Borrowing Date if such payment or prepayment prevents the proposed Loan from
becoming fully effective; or (c) the failure of any LIBOR Loan to be made by
Bank due to any action or inaction of Borrower.  Such funding losses and other
costs and expenses shall be calculated and billed by Bank and such bill shall,
as to the costs incurred, be conclusive absent manifest error.

  All past-due principal and interest on this Note, will, at Bank's option, bear
interest at the Highest Lawful Rate, or if applicable law does not provide for a
maximum nonusurious rate of interest, at a rate per annum equal to the Prime
Rate plus five percent (5%).

  In addition to all principal and accrued interest on this Note, Borrower
agrees to pay: (a) all reasonable costs and expenses incurred by Bank and all
owners and holders of this Note in collecting this Note through probate,
reorganization, bankruptcy or any other proceeding; and (b) reasonable
attorney's fees if and when this Note is placed in the hands of an attorney for
collection.

  Borrower and Bank intend to conform strictly to applicable usury laws.
Therefore, the total amount of interest (as defined under applicable law)
contracted for, charged or collected under this Note will never exceed the
Highest Lawful Rate.  If Bank contracts for, charges or receives any excess
interest, it will be deemed a mistake.  Bank will automatically reform the
contract or charge to conform to applicable law, and if excess interest has been
received, Bank will either refund the excess to Borrower or credit the excess on
the unpaid principal amount of this Note.  All amounts constituting interest
will be spread throughout the full term of this Note in determining whether
interest exceeds lawful amounts.

  If any payment of interest or principal herein provided for is not paid when
due, or if any Event of Default occurs under the terms of the Letter Agreement,
then Bank may do any or all of the following: (i) cease making Loans hereunder;
(ii) declare the Obligations to be immediately due and payable, without notice
of acceleration or of intention to accelerate, presentment and demand or protest
or notice of any kind, all of which are hereby expressly waived; (iii) set off,
in any order, against the Obligations any debt owing by Bank to any Obligor,
including, but not limited to, any deposit account, which right is hereby
granted by each Obligor to Bank; and (iv) exercise any and all other rights
under the Loan Documents, at law, in equity or otherwise.

  No waiver of any default is a waiver of any other default.  Bank's delay in
exercising any right or power under any Loan Document is not a waiver of such
right or power.

  Each Obligor severally waives notice, demand, presentment for payment, notice
of nonpayment, notice of intent to accelerate, notice of acceleration, protest,
notice of protest, and the filing of suit and diligence in collecting this Note
and all other demands and notices, and consents and agrees that its liabilities
and obligations will not be released or discharged by any or all of the
following, whether with or without notice to it or any other Obligor, and
whether before or after the stated maturity hereof: (i) extensions of the time
of payment; (ii) renewals; (iii) acceptances of partial payments; (iv) releases
or substitutions of any collateral or any Obligor; and (v) failure, if any, to
perfect or maintain perfection of any security interest in any collateral.  Each
Obligor agrees that acceptance of any partial payment will not constitute a
waiver and that waiver of any default will not constitute waiver of any prior or
subsequent default.

  Where appropriate the neuter gender includes the feminine and the masculine
and the singular number includes the plural number.

  Borrower represents and agrees that: all Loans evidenced by this Note are and
will be for business, commercial, investment or other similar purpose and not
primarily for personal, family, or household use as such terms are used in
Chapter One of the Texas Credit Code.

Chapter 346 of the Texas Finance Code shall not apply to this Note or to any
Loan evidenced by this Note.

  This Note is issued by the Borrower to evidence Loans outstanding from time to
time not to exceed the Maximum Loan Total in the aggregate, pursuant to a
$15,500,000.00 revolving line of credit (the "Revolving Line of Credit")
extended by the Bank to the Borrower pursuant to the Letter Agreement.  It is
given in renewal and modification of that certain promissory note dated April 8,
1998 executed by Borrower and payable to the order of the Bank on or before June
30, 1998 in the principal amount of $15,500,000.00.


                               Page 2 of 3 Pages
<PAGE>

Promissory Note
ERC INDUSTRIES, INC.
June 30, 1998 ("Date")
 
  This Note is governed by Texas law.  If any provision of this Note is illegal
or unenforceable, that illegality or unenforceability will not affect the
remaining provisions of this Note.  BORROWER AND BANK AGREE THAT THE COUNTY IN
WHICH BANK'S PRINCIPAL OFFICE IS LOCATED IN TEXAS IS PROPER VENUE FOR ANY ACTION
OR PROCEEDING BROUGHT BY BORROWER OR BANK, WHETHER IN CONTRACT, TORT, OR
OTHERWISE.  ANY ACTION OR PROCEEDING AGAINST BORROWER MAY BE BROUGHT IN ANY
STATE OR FEDERAL COURT IN SUCH COUNTY TO THE EXTENT NOT PROHIBITED BY APPLICABLE
LAW.  TO THE EXTENT PERMITTED BY APPLICABLE LAW BORROWER HEREBY IRREVOCABLY (A)
SUBMITS TO THE NONEXCLUSIVE JURISDICTION OF SUCH COURTS, AND (B) WAIVES ANY
OBJECTION IT MAY NOW OR HEREAFTER HAVE AS TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING BROUGHT IN ANY SUCH COURT OR THAT ANY SUCH COURT IS AN INCONVENIENT
FORUM.  BORROWER AGREES THAT SERVICE OF PROCESS UPON IT MAY BE MADE BY CERTIFIED
OR REGISTERED MAIL, RETURN RECEIPT REQUESTED, AT ITS ADDRESS SPECIFIED BELOW.
BANK MAY SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW AND MAY BRING ANY
ACTION OR PROCEEDING AGAINST BORROWER OR WITH RESPECT TO ANY OF ITS PROPERTY IN
COURTS IN OTHER PROPER JURISDICTIONS OR VENUES.

  For purposes of this Note, any assignee or subsequent holder of this Note will
be considered the "Bank," and each successor to Borrower will be considered the
"Borrower."

  Borrower represents that if it conducts business under an assumed business or
professional name it has properly filed Assumed Name Certificate(s) in the
office(s) required by Chapter 36 of the Texas Business and Commerce Code.

  NO COURSE OF DEALING BETWEEN BORROWER AND BANK, NO COURSE OF PERFORMANCE, NO
TRADE PRACTICES, AND NO EXTRINSIC EVIDENCE OF ANY NATURE MAY BE USED TO
CONTRADICT OR MODIFY ANY TERM OF THIS NOTE OR ANY OTHER LOAN DOCUMENT.

  THIS NOTE AND THE OTHER WRITTEN 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.

IN WITNESS WHEREOF, Borrower has executed this Note effective the day, month and
year first aforesaid.


                              BORROWER:  ERC INDUSTRIES, INC.


                              By:
                                 -------------------------------
                              Name:
                                   -----------------------------     
                              Title:
                                    ----------------------------

(Bank's signature is provided as its acknowledgment of the above as the final
written agreement between the parties.)

CHASE BANK OF TEXAS, NATIONAL ASSOCIATION,
formerly known as
TEXAS COMMERCE BANK NATIONAL ASSOCIATION


By:
   -------------------------------
Name:
     -----------------------------
Title:
      ----------------------------


                                  Page 3 of 3

<PAGE>
 
                                                                    EXHIBIT 10.2


          [LETTERHEAD OF WOOD GROUP PETROLEUM SERVICES APPEARS HERE]


June 16, 1998


ERC Industries, Inc.
1441 Park Ten Boulevard
Houston, Texas  77084

     RE:  $5 MILLION OVERDRAFT FACILITY

Dear Sirs:

This letter sets out the terms and conditions on which we agree to grant to you
an overdraft facility in the amount of FIVE MILLION ($5,000,000) UNITED STATES
DOLLARS (the "Facility"), to be used solely for the purposes of providing
working capital for your company.  The Facility will be unsecured.  The Facility
is subject to an overriding right on our part to demand repayment of all or any
part of the Facility at any time.  This right is exercisable at our absolute
discretion and without any requirement for us to show cause or breach of this
Facility Letter.

Interest shall be charged on the unpaid principal amount of the Facility at an
annual rate of the LIBOR Rate plus one percent (1%).  The "LIBOR Rate" means the
interest rate determined by us by reference to the British Bankers' Association
Interest Settlement Rate (as set forth by any service selected by us which has
been nominated by the British Bankers' Association as an authorized information
vendor for the purpose of displaying such Rate (including but not limited to,
Bloomberg, Rueters, or Telerate) to be the Rate at approximately 11:00 a.m.,
London time, two Business Days prior to the 
<PAGE>
 
Letter to ERC Industries, Inc.
June 16, 1998
Page 2


commencement of any Borrowing Period for dollar deposits in an amount comparable
to the Facility with maturity comparable to the period of the Borrowing Period.
Interest shall be calculated on the basis of a 360 day year for the actual days
elapsed, unless such calculation would result in a usurious interest rate, in
which case such interest shall be calculated on the basis of a 365 or 366 day
year, as the case may be.

Each Borrowing Period (other than the first Borrowing Period) shall be three
calendar months.  The first Borrowing Period shall commence on June 16, 1998 and
end on September 30, 1998.  Interest shall be payable on the last day of each
Borrowing Period.  If any Borrowing Period is shortened due to a demand for
repayment being made by us, interest shall be payable up to the date of
repayment.  You may repay the Facility at the end of any Borrowing Period.  With
our consent you may elect to repay the Facility prior to the end of any
Borrowing Period.  In the event that you do so a sum equivalent to the interest
due to the end of such Borrowing Period shall be payable at the time of the
repayment of the Facility as if the Facility had not been repaid prior to the
end of the Borrowing Period.

In the event that the percentage rate above the Adjusted LIBOR Rate which you
are currently paying to Chase Bank of Texas, National Association, on LIBOR
Loans, in terms of a Promissory Note dated April 8, 1998 (as the terms Adjusted
LIBOR Rate and LIBOR Loan are defined in the said Promissory Note) changes from
one percent (1%) to some other percentage, the interest rate above the LIBOR
Rate referred to above in 
<PAGE>
 
Letter to ERC Industries, Inc.
June 16, 1998
Page 3


respect of this Facility will be adjusted from the date on which Chase Bank of
Texas, National Association Rate changes to be an equivalent rate.

All payments to be made by you under this Facility Letter shall be made in
United States Dollars in immediately available funds.  All payments shall be
made without set off or counterclaim, and free and clear of, and without
deduction for, any taxes, levies, inposts, duties, charges, fees, deductions,
withholdings, restrictions, or conditions of any description.  If you are
required at any time by any applicable law to make any such deduction from any
payment, the sum due from you in respect of such payment shall be increased by
such amount as will result, notwithstanding the making of such deduction, in our
receipt on the due date for payment of each amount of a net sum equal to the sum
which we would have received had no such deduction been required to be made.

There will be no commitment fee or facility fee charged in respect of the
Facility and each party shall bear their own expenses in connection with the
preparation, execution and management of the Facility, unless you default in
making any repayment immediately on a demand for repayment having been made, in
which case you will be liable for all proper and reasonable fees, expenses,
charges and other outlays incurred in connection with the enforcement of our
right of repayment together with interest at the Highest Lawful Rate (as defined
in the Chase Bank of Texas, National Association, Promissory Note dated April 8,
1998) from the date of such default until payment.

Without prejudice to our right to demand repayment of the Facility at any time,
the terms and conditions of this Facility Letter and its continuation shall be
reviewed on a three-
<PAGE>
 
Letter to ERC Industries, Inc.
June 16, 1998
Page 4


monthly basis from the end of the first Borrowing Period. The terms and
conditions of this Facility Letter and its continuation are matters which we may
decide in our absolute discretion.

This Facility Letter will be governed by the Laws of the State of Texas.  Please
indicate your acceptance by signing the docket below.

Yours sincerely,



__________________________________________
Alan Semple, Chief Financial Officer, 
for and on behalf of Wood Group Petroleum
Services, Inc



WE HEREBY ACCEPT YOUR OFFER OF THE FACILITY ON THE TERMS AND SUBJECT TO THE
CONDITIONS IN THE FACILITY LETTER SET OUT ABOVE.



__________________________________________________    ________________________
Director For and On Behalf of ERC Industries, Inc.       Date

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-31-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                             315
<SECURITIES>                                         0
<RECEIVABLES>                                   25,262
<ALLOWANCES>                                       672
<INVENTORY>                                     32,372
<CURRENT-ASSETS>                                60,082
<PP&E>                                          25,362
<DEPRECIATION>                                  16,574
<TOTAL-ASSETS>                                  76,370
<CURRENT-LIABILITIES>                           37,361
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           275
<OTHER-SE>                                      34,827
<TOTAL-LIABILITY-AND-EQUITY>                    76,370
<SALES>                                         55,981
<TOTAL-REVENUES>                                55,981
<CGS>                                           40,718
<TOTAL-COSTS>                                   11,228
<OTHER-EXPENSES>                                  (95)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 799
<INCOME-PRETAX>                                  3,331
<INCOME-TAX>                                     1,386
<INCOME-CONTINUING>                              1,945
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,945
<EPS-PRIMARY>                                      .07
<EPS-DILUTED>                                      .07
        

</TABLE>


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