ERC INDUSTRIES INC /DE/
SC 13D/A, 1997-09-10
OIL & GAS FIELD MACHINERY & EQUIPMENT
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<PAGE>
 
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 12)*

                             ERC Industries, Inc.
- --------------------------------------------------------------------------------
                               (Name of Issuer)
 
                    Common Stock, par value $0.01 per share
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)
 
                                   268912102
- --------------------------------------------------------------------------------
                                (CUSIP Number)
 
                  Arthur M. Nathan, Haynes and Boone, L.L.P.
            1000 Louisiana Street, Suite 4300, Houston, Texas 77002
                                (713) 547-2000
- --------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized
                    to Receive Notices and Communications)
 
                               September 8, 1997
            -------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Check the following box if a fee is being paid with the statement [_]. (A fee is
not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
<PAGE>
 
                                 SCHEDULE 13D


- -----------------------                                  ---------------------
  CUSIP NO. 268912102                                      PAGE 2 OF 7 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
         John Wood Group PLC, a company registered in Scotland and incorporated
            under the laws of the United Kingdom

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- -------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4
         WC

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
 5    ITEMS 2(d) OR 2(e)                                            [_]
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
         United Kingdom

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF              24,337,702
                          
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                            0
     OWNED BY             
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING               24,337,702
                          
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH         10    
                            0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
         24,337,702
       
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
12                                                                  [_]
         
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
         88.5%
      
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
         CO      
      
- ------------------------------------------------------------------------------
<PAGE>
 
    The Schedule 13D dated October 19, 1992, as amended by Amendment No. 1
thereto dated December 3, 1992, Amendment No. 2 thereto dated December 7, 1992,
Amendment No. 3 thereto dated January 11, 1993, Amendment No. 4 thereto dated
April 30, 1993, Amendment No. 5 thereto dated July 29, 1993, Amendment No. 6
thereto dated March 13, 1996, Amendment No. 7 thereto dated March 22, 1996,
Amendment No. 8 thereto dated June 6, 1996, Amendment No. 9 thereto dated July
24, 1996, Amendment No. 10 thereto dated August 2, 1996 and Amendment No. 11 
thereto dated September 26, 1996 (the "Schedule 13D") of John Wood Group PLC
(the "Reporting Person"), relating to the Common Stock, $.01 par value per
share, of ERC Industries, Inc., a Delaware corporation (formerly known as ERC
Subsidiary, Inc., successor by merger to ERC Industries, Inc.), is hereby
amended and supplemented as set forth below. Defined terms used in this
Amendment No. 12 and not defined herein shall have their respective meanings as
set forth in the Schedule 13D.

Item 3.  Source and Amount of Funds or Other Consideration.

Item 3 is hereby amended by adding the following paragraphs:

    "The $10,000,000 used to make the purchases reported by this Amendment No.
12 to Schedule 13D came from the Reporting Person's working capital."

Item 4.  Purposes of the Transaction.

Item 4 is hereby amended by adding the following paragraphs:

    "On September 8, 1997, the Company and the Reporting Person entered into an
Investment Agreement (the "Investment Agreement") pursuant to which the
Reporting Person purchased and the Company sold an aggregate of 6,250,000 shares
(the "Shares") of Common Stock. The purchase price for such Shares was $1.60 per
share (or an aggregate consideration of $10,000,000). The Company's Board of
Directors formed a special committee consisting entirely of outside Directors
(the "Special Committee") to negotiate the transaction. The Special Committee
retained the investment banking firm of Rauscher Pierce Refsnes, Inc. to
evaluate the transaction.

    The Investment Agreement contains representations and warranties of the
Company and the Reporting Person which are typical of transaction of this kind.
The Investment Agreement is attached hereto as Exhibit K.

    In connection with the Investment Agreement, the Company granted
registration rights to the Reporting Person pursuant to a Registration Rights
Agreement dated as of September 8, 1997 (the "Registration Rights Agreement").
Under the terms of the Registration Rights Agreement, the Reporting Person has
demand registration rights, pursuant to which the Reporting Person may request,
not more than two times, registration by the Company of any or all of the Shares
within 120 days after notice to the Company. The Registration Rights Agreement
also grants piggyback registration rights, which allow the Reporting Person to
participate in underwritten public offerings initiated by the Company during the
next five years, subject to certain limitations and conditions set forth
therein. Under the terms of the Registration Rights Agreement, the ability of
the Reporting Person to exercise the rights granted thereunder may not be
subordinated or subject to registration rights granted to any other person or
entity.
<PAGE>
 
The rights granted under the Registration Rights Agreement terminate, and the
registration rights will not be exercisable by the Reporting Person, on the
earlier of (i) the fifth anniversary date of the Registration Rights Agreement,
or (ii) at such time as all of the Shares may immediately be sold under Rule 144
under the Securities Act of 1933, as amended, during any 90-day period.  The
Registration Rights Agreement is attached hereto as Exhibit L.

    As a result of the purchase of the Shares, the Reporting Person currently
owns an aggregate of 24,337,702 shares representing approximately 88.5% of the
outstanding shares of Common Stock.

    It is presently contemplated that the Reporting Person may, depending on its
evaluation of the Company's business, prospects and financial condition, the
market for the Common Stock, other opportunities available to the Reporting
Person, general economic conditions, regulatory conditions, financial and stock
market conditions and other future developments, make additional purchases of
Common Stock either in the open market or in private transactions (or
combinations thereof). The Reporting Person is continuing to evaluate its
investment in the Company, including the feasibility of acquiring all of the
capital stock of the Company. Any such acquisition would necessarily involve
extraordinary corporate actions with respect to the Company which may involve
certain of the actions or occurrences set forth in paragraphs (a) through (j) of
Item 4 of Schedule 13D, including, without limitation, actions to eliminate
minority interests in the Company, terminate registration status pursuant to
Section 12(g)(4) of the 1934 Act and delist the Common Stock from the Nasdaq
Stock Market. Depending upon the circumstances, the Reporting Person might also
hold its shares of Common Stock for an extended period of time, or may decide to
sell all or part of its investment in the Common Stock. While the Reporting
Person is continuing to evaluate its investment in the Company, no detailed
plans or arrangements have been made at this time."

Item 5.  Interest in Securities of the Issuer.

    The information set forth in Item 4 of this Amendment No. 12 is incorporated
by reference in response to this Item 5.

Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Issuer.

    The information set forth in Item 4 of this Amendment No. 12 is incorporated
by reference in response to this Item 6.

Item 7.  Material to be Filed as Exhibits.

Item 7 is hereby amended and restated in its entirety by the following
paragraphs:

    *A   Form of proposed Certificate of Ownership and Merger merging ERC
         Industries, Inc. into ERC Subsidiary, Inc.
<PAGE>
 
    *B   Stock Purchase Agreement dated October 15, 1992 among the John Wood
         Group PLC, as Purchaser, Quantum Fund, N.V., Warren H. Haber, Lawrence
         M. Pohly and John L. Teager, as Sellers, and ERC Industries, Inc.

    *C   Standstill and Voting Agreement dated October 15, 1992 among John Wood
         Group PLC, Quantum Fund, N.V. and ERC Industries, Inc.

    *D   Irrevocable Proxy executed by Quantum Fund, N.V. to John Wood Group PLC
         and J. Derek P. Jones.

    *E   Notice of Waiver of Conditions to Consummate Purchase Agreement dated
         November 30, 1992.

    *F   Agreement dated December 4, 1992, between the Reporting Person and ERC
         Industries, Inc.

    *G   Agreement dated December 4, 1992, among the Reporting Person, ERC
         Industries, Inc., and the Indemnitees.

    *H   Letter Agreement dated March 5, 1996, between the Reporting Person and
         Quantum.

    *I   Investment Agreement dated June 6, 1996, between the Reporting Person
         and the Company.

    *J   Registration Rights Agreement dated June 6, 1996, between the Reporting
         Person and the Company.

   **K   Investment Agreement dated September 8, 1997, between the Reporting
         Person and the Company.

   **L   Registration Rights Agreement dated September 8, 1997, between the
         Reporting Person and the Company.

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

    *    Previously filed.
   **    Filed herewith.
<PAGE>
 
                                   SIGNATURE


    After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Amendment No. 12 to Schedule 13D
is true, complete and correct.


    Date:  September 10, 1997


                                            JOHN WOOD GROUP PLC



                                            By:      /s/ J. Derek P. Jones
                                               ------------------------------
                                               Name:   J. Derek P. Jones
                                               Title:  Director
<PAGE>
 
                                 EXHIBIT INDEX


    *A   Form of proposed Certificate of Ownership and Merger merging ERC
         Industries, Inc. into ERC Subsidiary, Inc.

    *B   Stock Purchase Agreement dated October 15, 1992 among the John Wood
         Group PLC, as Purchaser, Quantum Fund, N.V., Warren H. Haber, Lawrence
         M. Pohly and John L. Teager, as Sellers, and ERC Industries, Inc.

    *C   Standstill and Voting Agreement dated October 15, 1992 among John Wood
         Group PLC, Quantum Fund, N.V. and ERC Industries, Inc.

    *D   Irrevocable Proxy executed by Quantum Fund, N.V. to John Wood Group
         PLC and J. Derek P. Jones.

    *E   Notice of Waiver of Conditions to Consummate Purchase Agreement dated
         November 30, 1992.

    *F   Agreement dated December 4, 1992, between the Reporting Person and ERC
         Industries, Inc.

    *G   Agreement dated December 4, 1992, among the Reporting Person, ERC
         Industries, Inc., and the Indemnitees.

    *H   Letter Agreement dated March 5, 1996, between the Reporting Person
         and Quantum.

    *I   Investment Agreement dated June 6, 1996, between the Reporting
         Person and the Company.

    *J   Registration Rights Agreement dated June 6, 1996, between the
         Reporting Person and the Company.

   **K   Investment Agreement dated September 8, 1997, between the Reporting
         Person and the Company.

   **L   Registration Rights Agreement dated September 8, 1997, between the
         Reporting Person and the Company.


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

    *    Previously filed.
   **    Filed herewith.

<PAGE>
 
                                  EXHIBIT "K"
                                  -----------


    THE SECURITIES TO BE ISSUED AND SOLD PURSUANT TO THIS INVESTMENT AGREEMENT
    HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR
    THE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES AND MAY NOT BE
    TRANSFERRED IN VIOLATION OF SUCH ACT, THE RULES AND REGULATIONS PROMULGATED
    THEREUNDER, ANY SUCH STATE SECURITIES LAWS OR THE PROVISIONS OF THIS
    AGREEMENT.

                             INVESTMENT AGREEMENT

    INVESTMENT AGREEMENT (the "Agreement") dated as of September 8, 1997, by
  and between JOHN WOOD GROUP PLC, a company incorporated in the United Kingdom
  and registered in Scotland ("Investor") and ERC INDUSTRIES, INC., a Delaware
  corporation ("ERC").

    WHEREAS, ERC needs an infusion of cash in order to pursue its business
  interests; and

    WHEREAS, Investor is willing to purchase shares of common stock, par
  value $0.01 per share of ERC (the "ERC Common Stock") on the terms and
  conditions described in this Agreement; and

    WHEREAS, ERC desires to sell to Investor and Investor desires to purchase
  from ERC, shares of ERC Common Stock subject to the terms and conditions
  herein;

    NOW, THEREFORE, in reliance upon the representations and warranties made
  herein and in consideration of the premises and the mutual covenants and
  conditions herein contained, the parties agree as follows:

                                   ARTICLE 1

                   SALE AND PURCHASE OF THE SHARES; CLOSING
                   -----------------------------------------

1.1   SALE OF SHARES.

      At the Closing (as defined in Section 1.3 hereof), and subject to the
      terms and conditions hereof, ERC will issue and sell to Investor and
      Investor will purchase from ERC 6,250,000 shares of ERC Common Stock
      (the "ERC Shares").

1.2   DELIVERIES AT CLOSING.

      (a)  At the Closing, ERC shall deliver to Investor a certificate duly
           issued in the name of Investor representing the ERC Shares
           purchased by Investor and the documents contemplated by Section
           2.1 below.
<PAGE>
 
      (b)  At the Closing, Investor shall pay to ERC $10,000,000.00 (the
           "ERC Stock Purchase Price"), by wire transfer of immediately
           available funds, to such account as ERC may specify in writing
           prior to the Closing Date.

      (c)  At the Closing, ERC shall execute and deliver the Registration
           Rights Agreement in the form attached to this Agreement as
           Exhibit A.

1.3   THE CLOSING.

      (a)  The closing of the purchase and sale of the ERC Shares hereunder
           (the "Closing"), shall be held at the offices of Haynes and
           Boone, L.L.P., 1000 Louisiana, Suite 4300, Houston, Texas 77002-
           5012. The Closing shall occur on the day and at the time (the
           "Closing Date") at which ERC notifies Investor that all
           conditions to ERC's purchase of the ERC Shares shall have been
           satisfied.

                                   ARTICLE 2

                             CONDITIONS TO CLOSING
                             ---------------------

2.1   CONDITIONS TO CLOSING OF INVESTOR. The obligation of Investor to
      purchase the ERC Shares on the Closing Date hereunder is subject to
      the satisfaction of the following conditions:

      (a)  The representations and warranties of ERC contained in this Agreement
           shall be true and correct in all material respects on and as of the
           Closing Date as though made on and as of such date (except for those
           made as of a specified date, which shall be true and correct as of
           such date) and ERC shall have performed in all material respects its
           obligations hereunder required to be performed on or before the
           Closing Date and Investor shall have received from ERC an Officers'
           Certificate signed by its Chief Executive Officer and its Chief
           Financial Officer to the effect of the foregoing;

      (b)  There shall not have occurred (i) any general suspension of trading
           in securities on NASDAQ; or (ii) a declaration of a banking
           moratorium or any suspension of payments in respect of banks in the
           United States;

      (c)  There shall not be any temporary or permanent order, injunction or
           decree entered or enforced, by or before any United States or U.K.
           Government Entity, or any statute, rule or regulation enacted or
           promulgated, that would prohibit the transactions contemplated
           hereunder;

      (d)  Since the date of this Agreement, neither ERC and its Subsidiaries,
           taken as a whole, nor ERC shall have undergone or suffered any long-
           term material adverse change in its business, financial condition or
           results of operations;

      (e)  ERC shall have obtained all consents and approvals which are legally
           required to be obtained prior to consummation of the purchase of the
           ERC Shares hereunder, which if

                                      -2-
<PAGE>
 
           not obtained would have a material adverse effect on ERC and its
           Subsidiaries, taken as a whole;

      (f)  The Board of Directors of Investor shall have approved this Agreement
           and the transactions contemplated hereunder and thereunder on or
           before September 8, 1997;

      (g)  Rauscher Pierce Refsnes, Inc. shall have issued and delivered a
           fairness opinion to ERC and its Special Committee of the Board of
           Directors in a form which is reasonably acceptable to the Investor
           and which opines that the purchase price of the ERC Shares being
           purchased pursuant to this Agreement is reasonable and fair to both
           ERC and its stockholders from a financial point of view and such
           opinion shall not have been withdrawn, revoked or modified in any
           material respect; and

      (h)  ERC shall have delivered a certified copy of the resolutions of its
           Special Committee of the Board of Directors and its full Board of
           Directors authorizing and approving (1) this Agreement and the
           Registration Rights Agreement, (2) the transaction contemplated by
           this Agreement and the Registration Rights Agreement, (3) such
           further actions as such officers deem necessary or appropriate in
           order to consummate the transaction contemplated by this Agreement
           and the Registration Rights Agreement, and further directing ERC's
           proper officers to execute and deliver this Agreement and the
           Registration Rights Agreement and such other agreements, certificates
           and papers as may be necessary or appropriate to consummate the
           transactions contemplated by this Agreement and the Registration
           Rights Agreement.

      The foregoing conditions are for the sole benefit of Investor and may be
  asserted by Investor in its sole discretion or may be waived by Investor in
  whole or in part at any time in the sole discretion of Investor.

2.2   CONDITIONS TO CLOSING OF ERC.  The obligation of ERC to sell the ERC
      Shares on the Closing Date hereunder is subject to the satisfaction of the
      following conditions:

      (a)  The representations and warranties of Investor contained in this
           Agreement shall be true and correct in all material respects on and
           as of the Closing Date as though made on and as of such date (except
           for those made as of a specified date, which shall be true and
           correct as of such date) and Investor shall have performed in all
           material respects its obligations hereunder required to be performed
           on or before the Closing Date and ERC shall have received from
           Investor an Officers' Certificate signed by one of its representative
           directors to the effect of the foregoing;

      (b)  There shall not have occurred (i) any general suspension of trading
           in securities on NASDAQ; or (ii) a declaration of a banking
           moratorium or any suspension of payments in respect of banks in the
           United States;

      (c)  There shall not be any temporary or permanent order, injunction or
           decree entered or enforced, by or before any United States or U.K.
           Government Entity, or any statute, rule

                                      -3-
<PAGE>
 
           or regulation enacted or promulgated, that would prohibit the
           transactions contemplated hereunder;

      (d)  Each of ERC and Investor shall have obtained all consents and
           approvals which are legally required to be obtained prior to the sale
           of the ERC Shares hereunder, which if not obtained would have a
           material adverse effect on ERC and its Subsidiaries, taken as a
           whole;

      (e)  The Board of Directors of Investor shall have approved this Agreement
           and the transactions contemplated hereunder and thereunder on or
           before September 8, 1997;

      (f)  Rauscher Pierce Refsnes, Inc. shall have issued and delivered a
           fairness opinion to ERC and its Special Committee of the Board of
           Directors in a form which is reasonably acceptable to the Investor
           and which opines that the purchase price of the ERC Shares being
           purchased pursuant to this Agreement is reasonable and fair to both
           ERC and its stockholders from a financial point of view and such
           opinion shall not have been withdrawn, revoked or modified in any
           material respect; and

      (g)  Investor shall have delivered a certified copy of the resolutions of
           its Board of Directors authorizing and approving (1) this Agreement
           and the Registration Rights Agreement, (2) the transaction
           contemplated by this Agreement and the Registration Rights Agreement,
           (3) such further actions as its officers deem necessary or
           appropriate in order to consummate the transaction contemplated by
           this Agreement and the Registration Rights Agreement, and further
           directing Investor's proper officers to execute and deliver this
           Agreement and the Registration Rights Agreement and such other
           agreements, certificates and papers as may be necessary or
           appropriate to consummate the transactions contemplated by this
           Agreement and the Registration Rights Agreement.

      The foregoing conditions are for the sole benefit of ERC and may be
  asserted by ERC in its sole discretion or may be waived by ERC in whole or in
  part at any time in the sole discretion of ERC.

                                   ARTICLE 3

                    REPRESENTATIONS AND WARRANTIES AS TO ERC
                   -----------------------------------------

      ERC hereby represents and warrants to Investor as follows:

3.1   ORGANIZATION, ETC., OF ERC. ERC is a corporation duly organized, validly
      existing and in good standing under the laws of the State of Delaware and
      has all requisite corporate power and authority to own and operate its
      properties, to carry on its business as now conducted and proposed by ERC
      to be conducted, to enter into this Agreement, and to carry out the
      provisions of this Agreement, and to consummate the transactions
      contemplated hereby and thereby. ERC is duly qualified and in good
      standing in each jurisdiction in which the property owned, leased or
      operated by it or the nature of the business conducted by it makes such
      qualification

                                      -4-
<PAGE>
 
      necessary, except where the failure to be so qualified has or would be
      reasonably expected (so far as can be foreseen at the time) to have a
      material adverse effect on the business, results of operations or
      financial condition of ERC and its Subsidiaries taken as a whole. Except
      as described in the ERC SEC Reports filed prior to the date hereof or
      Schedule 3.1 of the Disclosure Schedule, ERC is not subject to any order,
      complaint, proceeding or investigation pending or, to the knowledge of the
      Responsible Officers of ERC, threatened, which affects or would be
      reasonably expected (so far as can be foreseen at the time) to affect the
      validity of any approvals or licenses or impair the renewal thereof,
      except where the invalidity of any approvals or licenses or the non-
      renewal thereof does not have and would not be reasonably expected (so far
      as can be foreseen at the time) to have a material adverse effect on the
      business, results of operations or financial condition of ERC and its
      Subsidiaries taken as a whole.

3.2   OPERATIONS OF SUBSIDIARIES.  Each Subsidiary of ERC is:

      (a)  a corporation or other legal entity duly organized, validly existing
           and (if applicable) in good standing under the laws of the
           jurisdiction of its organization and has the requisite corporate or
           other organizational power and authority to own its properties and
           conduct its business and operations as currently conducted, except
           where the failure to be duly organized, validly existing and in good
           standing does not have, and would not be reasonably expected (so far
           as can be foreseen at the time) to have, a material adverse effect on
           the business, results of operations or financial condition of ERC and
           its Subsidiaries taken as a whole,

      (b)  duly qualified and in good standing (if applicable) in each
           jurisdiction in which the property owned, leased or operated by it or
           the nature of the business conducted by it makes such qualification
           necessary, except where the failure to be so qualified does not have
           and would not be reasonably expected (so far as can be foreseen at
           the time) to have a material adverse effect on the business, results
           of operations or financial condition of ERC and its Subsidiaries
           taken as a whole, and

      (c)  is subject to no order, complaint, proceeding or investigation
           pending or, to the knowledge of ERC's Responsible Officers,
           threatened, which would be reasonably expected (so far as can be
           foreseen at the time) to affect the validity of any approvals or
           licenses or impair the renewal thereof, except where the invalidity
           of any approvals or licenses or the non-renewal thereof does not have
           and would not be reasonably expected (so far as can be foreseen at
           the time) to have a material adverse effect on the business, results
           of operations or financial condition of ERC and its Subsidiaries
           taken as a whole.

3.3   AUTHORIZATION. This Agreement and all other agreements which are to be
      executed and delivered by ERC in connection with the transactions
      contemplated by this Agreement, and the consummation of the transactions
      contemplated hereby and thereby, have been unanimously approved by the
      special committee of the Board of Directors of ERC and have been duly
      authorized by all other necessary corporate action on the part of ERC.
      This Agreement and all other agreements which are to be executed and
      delivered in connection with

                                      -5-
<PAGE>
 
      the consummation of the transactions contemplated by this Agreement, upon
      execution and delivery thereof will be, duly executed and delivered by a
      duly authorized officer of ERC and this Agreement and such other
      agreements constitute valid and binding agreements of ERC, enforceable
      against ERC in accordance with their terms, except as may be limited by
      applicable bankruptcy, insolvency, reorganization, moratorium and other
      similar laws of general application which may affect the enforcement of
      creditors' rights generally and by general equitable principles. ERC has
      delivered to Investor true and correct copies of resolutions adopted by
      the Special Committee and entire Board of Directors of ERC approving this
      Agreement.

3.4   CAPITAL STOCK.

      (a)  The authorized capital stock of ERC consists of (i) 30,000,000 shares
           of common stock, par value $0.01 per share, of which 21,248,272
           shares are outstanding as of the date hereof, and (ii) 10,000,000
           shares of serial preferred stock, par value $1.00 per share, none of
           which are issued or outstanding as of the date hereof. All
           outstanding shares of ERC Common Stock are duly authorized, validly
           issued, fully paid and non-assessable, and no class of capital stock
           of ERC is entitled to preemptive rights.

      (b)  There are outstanding on the date hereof no options, warrants or
           other rights to acquire or other securities convertible into or
           exchangeable for capital stock of ERC. Except as disclosed in ERC SEC
           Reports filed prior to the date hereof or Schedule 3.4 of the
           Disclosure Schedule, all outstanding shares of capital stock of the
           Subsidiaries of ERC are owned by ERC or a direct or indirect wholly-
           owned Subsidiary of ERC, free and clear of all Liens (other than
           Liens described in Schedule 3.4 of the Disclosure Schedule).

      (c)  Immediately following the consummation of the transactions to be
           completed at the Closing, Investor will hold shares representing
           approximately 88.5% of the issued and outstanding shares of ERC
           Common Stock and there will be no outstanding options, warrants and
           other rights to acquire or other securities convertible into or
           exchangeable for capital stock of ERC.

3.5   LITIGATION. Except as disclosed in the ERC SEC Reports filed prior to the
      date hereof or in Schedule 3.5 of the Disclosure Schedule and except for
      any rulemaking proceeding in the ordinary course of business, there are
      no actions, suits, investigations or proceedings pending or, to the
      knowledge of the Responsible Officers of ERC, threatened against ERC or
      any of its Subsidiaries, or any property of ERC or any such Subsidiary,
      in any court or before any arbitrator or before or by any Government
      Entity, except actions, suits, investigations or proceedings which, in
      the aggregate, do not have and would not be reasonably expected (so far
      as can be foreseen at the time) to have a material adverse effect on (i)
      the business, results of operations or financial condition of ERC and its
      Subsidiaries taken as a whole, or (ii) as of the date hereof, the ability
      of ERC to perform its obligations under this Agreement.

                                      -6-
<PAGE>
 
3.6   COMPLIANCE WITH OTHER INSTRUMENTS, ETC.  Except where the violation of
      such an agreement or other document would not have a material adverse
      effect on the business, results of operations or financial condition of
      ERC and its Subsidiaries taken as a whole, neither ERC nor any Subsidiary
      of ERC is in violation of any term of:

      (a)  its charter, by-laws or other organizational documents,

      (b)  any material agreement or instrument including any such related to
           Indebtedness,

      (c)  any applicable law, ordinance, rule or regulation of any Government
           Entity, or

      (d)  any applicable order, judgment or decree of any court, arbitrator or
           Government Entity, the consequences of which violation, whether
           individually or in the aggregate, have or would be reasonably
           expected (so far as can be foreseen at the time) to have a material
           adverse effect on (i) the business, results of operations or
           financial condition of ERC and its Subsidiaries taken as a whole, or
           (ii) the ability of ERC to perform its obligations under this
           Agreement. Except as set forth on Schedule 3.6 of the Disclosure
           Schedule, the execution, delivery and performance of this Agreement
           by ERC will not result in any violation of or conflict with,
           constitute a default under, or require any consent under any term of
           the charter, bylaws or other organizational document of ERC (or any
           of its Subsidiaries) or any such agreement, instrument, law,
           ordinance, rule, regulation, order, judgment or decree or result in
           the creation of (or impose any obligation on ERC or any of its
           Subsidiaries to create) any Lien upon any of the properties or assets
           of ERC or any of its Subsidiaries pursuant to any such term, except
           where such violation, conflict or default, or the failure to obtain
           such consent, individually or in the aggregate, does not have and
           would not be reasonably expected (so far as can be foreseen at the
           time) to have a material adverse effect on (i) the business, results
           of operations or financial condition of ERC and its Subsidiaries
           taken as a whole, or (ii) the ability of ERC to perform its
           obligations under this Agreement.

3.7   TAXES. ERC and its Subsidiaries have filed all federal, state, county,
      local and material foreign tax returns required to be filed by them, and
      have paid all taxes shown to be due thereon, other than taxes appropriate
      reserves for which have been made in ERC's financial statements to the
      extent required under generally accepted accounting principles in the
      United States, except where the failure to file such tax returns or to
      have paid such taxes would not, singly or in the aggregate have a material
      adverse effect on the business, results of operations or financial
      condition of ERC and its Subsidiaries, taken as a whole. There are no
      assessments or adjustments that have been asserted in writing against ERC
      or its Subsidiaries for any period for which ERC has not made appropriate
      reserves in ERC's financial statements to the extent required by generally
      accepted accounting principles in the United States.

3.8   INFORMATION SUPPLIED.

      (a)  ERC has filed all reports and schedules (including without
           limitation proxy statements) required to be filed with the SEC since
           December 31, 1995 (collectively, the "ERC SEC

                                      -7-
<PAGE>
 
           Reports"). None of the ERC SEC Reports, as of their respective dates
           (as amended through the date hereof), contained any untrue statement
           of material fact or omitted to state a material fact required to be
           stated therein or necessary to make the statements therein, in light
           of the circumstances under which they were made, not misleading. All
           of the ERC SEC Reports, as of their respective dates (as amended
           through the date hereof), complied in all material respects with the
           requirements of the Securities Exchange Act of 1934, as amended (the
           "Exchange Act") and the applicable rules and regulations thereunder.

3.9   BROKERS AND FINDERS.  Except for the fees and expenses payable to
      Rauscher Pierce Refsnes, Inc., or except as shown on Schedule 3.9, ERC has
      not employed any investment banker, broker, finder, consultant or
      intermediary in connection with the transactions contemplated by this
      Agreement which would be entitled to any investment banking, brokerage,
      finder's or similar fee or commission in connection with this Agreement,
      or the transactions contemplated hereby.

3.10  IMPROPER AND OTHER PAYMENTS.  To the best knowledge of the Responsible
      Officers of ERC,

      (a)  none of ERC, any wholly-owned Subsidiary of ERC or any director,
           officer, employee, agent or representative of ERC or any such
           Subsidiary of ERC or any person or entity acting on behalf of any of
           them, has made, paid or received any bribes, kickbacks or other
           similar payments to or from any person or entity, whether lawful or
           unlawful;

      (b)  no improper foreign payment (as defined in the Foreign Corrupt
           Practices Act) has been made; and

      (c)  the internal accounting controls of ERC and its Subsidiaries are
           adequate to detect any of the foregoing, except in each case as would
           not have a material adverse effect on the business, results of
           operations or financial condition of ERC and its Subsidiaries, taken
           as a whole.

                                   ARTICLE 4

                  REPRESENTATIONS AND WARRANTIES OF INVESTOR
                  ------------------------------------------

      Investor represents and warrants to ERC and ERC as follows:

4.1   ORGANIZATION, ETC., OF INVESTOR.  Investor is a corporation duly
      organized, validly existing and in good standing under the laws of the
      United Kingdom and has all requisite corporate power and authority to own
      and operate its properties, to carry on its business as now conducted and
      proposed by Investor to be conducted, to enter into this Agreement and to
      carry out the provisions of this Agreement and to consummate the
      transactions contemplated hereby.

                                      -8-
<PAGE>
 
4.2   AUTHORIZATION.  This Agreement and all other agreements which are to be
      executed and delivered by Investor in connection with the transactions
      contemplated by this Agreement, and the consummation of the transactions
      contemplated hereby and thereby, have been approved by the Board of
      Directors of Investor and have been duly authorized by all other necessary
      corporate action on the part of Investor. This Agreement and all other
      agreements which are to be executed and delivered in connection with the
      consummation of the transactions contemplated by this Agreement, upon
      execution and delivery thereof will be, duly executed and delivered by a
      duly authorized officer of Investor and this Agreement and such other
      agreements constitute valid and binding agreements of Investor,
      enforceable against Investor in accordance with their terms, except as may
      be limited by applicable bankruptcy, insolvency, reorganization,
      moratorium and other similar laws of general application which may affect
      the enforcement of creditors' rights generally and by general equitable
      principles.  Investor has delivered to ERC true and correct copies of
      resolutions adopted by the  Board of Directors of Investor approving this
      Agreement.

4.3   COMPLIANCE WITH OTHER INSTRUMENTS, ETC.  The execution, delivery and
      performance of this Agreement by Investor will not result in any violation
      of or conflict with, constitute a default under, or require any consent
      under any term of, the charter, by-laws or other organizational documents
      of Investor or any of its Subsidiaries or any agreement to which Investor
      is a party or by which it is bound or any applicable law, ordinance, rule,
      regulation, order, judgment or decree, except where such violation,
      conflict or default, or the failure to obtain such consent, individually
      or in the aggregate, does not have and would not be reasonably expected
      (so far as can be foreseen at the time) to have a material adverse effect
      on the ability of Investor to perform its obligations under this
      Agreement.

4.4   INVESTMENT.  Investor is acquiring the ERC Shares for investment for its
      own account and not with the view to, or for resale in connection with,
      any distribution thereof.  Investor is an "accredited investor" as such
      term is defined by Regulation D under the Securities Act.  Investor
      understands that (i) the ERC Shares have not been registered under the
      Securities Act of 1933, as amended (the "Securities Act") by reason of
      exemption from the registration provisions of the Securities Act which
      depends upon, among other things, the bona fide nature of its investment
      intent as expressed herein, and (ii) the stock certificate or certificates
      representing the ERC Shares will contain an appropriate Securities Act
      restrictive legend.

4.5   BROKERS AND FINDERS.  Investor has not employed any investment banker,
      broker, finder, consultant or intermediary in connection with the
      transactions contemplated by this Agreement which would be entitled to any
      investment banking, brokerage, finder's or similar fee or commission in
      connection with this Agreement or the transactions contemplated hereby or
      thereby.

4.6   FINANCING.  Investor has sufficient funds to perform its obligations
      hereunder.

                                      -9-
<PAGE>
 
                                   ARTICLE 5

                                  TERMINATION
                                  -----------

5.1   TERMINATION.  This Agreement may be terminated at any time on or before
      the Closing Date:

      (a)   by mutual written consent of ERC and Investor;

      (b)   by Investor, by written notice to ERC, if

        (i) there shall have been any material breach of any representation or
            warranty, or any material breach of any covenant or agreement, of
            ERC hereunder, and such breach shall not have been remedied before
            the Closing, or

       (ii) the Special Committee of the Board of Directors of ERC shall
            withdraw or modify in any manner materially adverse to Investor
            its approval or recommendation of this Agreement, or resolve by
            Board resolution to take such action;

      (c)   by ERC, by written notice to Investor, if there shall have been any
            material breach of any representation or warranty, or any material
            breach of any covenant or agreement, of Investor hereunder, and such
            breach shall not have been remedied before the Closing;

      (d)   by Investor if the Board of Directors of Investor shall not have
            approved this Agreement and the transactions contemplated hereunder
            on or before the Closing Date; or

      (e)   by either ERC or Investor if the Special Committee of the Board of
            Directors of ERC shall not have received, within five business days
            prior to the Closing Date, the opinion of Rauscher Pierce Refsnes,
            Inc. to the effect that the consideration to be received by ERC in
            exchange for the ERC Shares is fair to ERC and its stockholders from
            a financial point of view.

5.2   EFFECT OF TERMINATION.  In the event of termination of this Agreement in
      compliance with Section 5.1, there shall be no liability on the part of
      any party hereto or any of their respective officers or directors
      hereunder.

                                   ARTICLE 6

                                INDEMNIFICATION
                                ---------------

6.1   INDEMNIFICATION.  ERC shall, until the expiration of the applicable
      statute of limitations, indemnify Investor and its Affiliates and each
      director, officer, employee, advisor and agent of investor and its
      Affiliates (collectively, the "Investor Indemnified Parties") against, and
      hold Investor Indemnified Parties harmless from, all losses, claims,
      damages, liabilities, costs (including the costs of attorneys' fees) and
      expenses relating to or in connection with any third party claim or suit
      and including any and all attorneys' fees and expenses and costs of

                                      -10-
<PAGE>
 
      investigation and litigation incurred in enforcing this Section 6.1
      (collectively, "Investor Losses"), arising out of or related to (i) a
      breach by ERC of any agreement, covenant, representation or warranty
      contained in this Agreement, or (ii) any untrue or alleged untrue
      statement of a material fact contained in any ERC SEC Filings, the
      Disclosure Schedule or any other instruments, agreement, statement,
      schedule or document, or the omission or the alleged omission to state
      therein a material fact necessary in order to make the statements therein,
      in the light of the circumstances under which they were made, not
      misleading, whether or not the transactions contemplated by this Agreement
      are consummated, and whether or not an investigation or proceeding
      requires the participation of, or is commenced or filed against, Investor
      because of this Agreement or the transactions contemplated hereby or
      thereby, provided, however, that ERC shall not be liable in any such case
      set forth in clause (ii) to the extent but only to the extent that any
      Investor Loss arises out of or is based upon any such untrue statement or
      alleged untrue statement or omission or alleged omission made in reliance
      upon and in conformity with investor information furnished by Investor
      expressly for use in such ERC SEC Filings or any other instruments,
      agreements, statements, schedules or documents, if any.

      ERC agrees to reimburse Investor Indemnified Parties promptly for all such
Investor Losses as they are incurred by Investor Indemnified Parties, including
in connection with the investigation of, preparation for, or defense of, any
pending or threatened claim, whether or not such claim, action or proceeding is
initiated or brought by or on behalf of ERC. The obligations of ERC under this
Section 6.1 shall survive the repurchase or redemption of the ERC Shares, any
transfer of the ERC Shares by Investor and the termination of this Agreement.

6.2   INDEMNIFICATION.  Investor ("Stockholder Indemnitor") shall, until the
      expiration of the applicable statute of limitations, indemnify ERC, and
      its Subsidiaries and each director, officer, employee, advisor and agent
      of ERC and its respective Subsidiaries (collectively, the "ERC Indemnified
      Parties") against, and hold ERC Indemnified Parties harmless from, all
      losses, claims, damages, liabilities, costs (including the costs of
      attorneys' fees) and expenses relating to or in connection with any third
      party claim or suit and including any and all attorneys' fees and expenses
      and costs of investigation and litigation incurred in enforcing this
      Section 6.2 (collectively, "ERC Losses"), arising out of or related to (i)
      a breach by Investor of any agreement, covenant, representation or
      warranty contained in this Agreement, or (ii) any untrue or alleged untrue
      statement of a material fact contained in this Agreement, or any other
      instruments, agreement, statement, schedule or document, or the omission
      or the alleged omission to state therein a material fact necessary in
      order to make the statements therein, in the light of the circumstances
      under which they were made, not misleading, whether or not the
      transactions contemplated by this Agreement are consummated, and whether
      or not an investigation or proceeding requires the participation of, or is
      commenced or filed against, ERC because of this Agreement, or the
      transactions contemplated hereby or thereby, in each such case set forth
      in clause (ii) to the extent but only to the extent that any ERC Loss
      arises out of or is based upon any such untrue statement or alleged untrue
      statement or omission or alleged omission made in reliance upon and in
      conformity with investor information furnished by such Stockholder
      Indemnitor expressly for use in any instrument, agreement, statement,
      schedule or document.

                                      -11-
<PAGE>
 
      Stockholder Indemnitor agrees to reimburse ERC Indemnified Parties
promptly for all such ERC Losses as they are incurred by ERC Indemnified
Parties, including in connection with the investigation of, preparation for, or
defense of, any pending or threatened claim, whether or not such claim, action
or proceeding is initiated or brought by or on behalf of ERC. The obligations of
Stockholder Indemnitor under this Section 6.2 shall survive the repurchase or
redemption of the ERC Shares, any transfer of the ERC Shares by Investor and the
termination of this Agreement.

                                   ARTICLE 7

                                 MISCELLANEOUS
                                 -------------

7.1   GOVERNING LAW.  This Agreement shall be governed by and construed in
      accordance with the laws of the State of Texas.

7.2   SURVIVAL.  None of the representations and warranties made herein shall
      survive the earlier of the termination of this Agreement in accordance
      with its terms and the Closing Date.

7.3   SUCCESSORS AND ASSIGNS.  This Agreement shall inure to the benefit of,
      and be binding upon, the parties hereto and their respective successors
      and permitted assigns.  No party hereto shall assign any of its rights,
      interests or obligations hereunder without the prior written consent of
      the other parties, except that Investor may assign its rights, interests
      and obligations hereunder to a wholly-owned, direct or indirect,
      Subsidiary provided that Investor remains primarily liable for all of the
      obligations of Investor hereunder.

7.4   ENTIRE AGREEMENT; AMENDMENT.  This Agreement, together with the
      Registration Rights Agreement constitute the full and entire understanding
      and agreement between the parties with regard to the subjects hereof.
      Neither this Agreement nor any term hereof may be amended, waived,
      discharged or terminated except by a written instrument signed by each
      party hereto.

7.5   NOTICES, ETC.  All notices and other communications required or permitted
      hereunder shall be in writing and shall be mailed by first class mail,
      postage prepaid, or by express courier, or delivered either by hand or by
      messenger or by telecopy (and confirmed by one of the foregoing methods),
      addressed as follows:

        To Investor, at:

        John Wood Group PLC
        John Wood House
        Greenwell Road, East Tullos
        Aberdeen AB1 4AX
        Scotland
        Telecopy No.: 011-44-1-224-871997
        Attention: Hugh Fraser, Esq.

                                      -12-
<PAGE>
 
        With a copy to:

        Haynes and Boone, L.L.P.
        1000 Louisiana, Suite 4300
        Houston, Texas 77002-5012
        Telecopy No.: (713) 547-2600
        Attention: Arthur M. Nathan, Esq.

        To ERC, at:

        16920 Park Row
        Houston, Texas 77084
        Telecopy No.: (713) 398-8086
        Attention: Mr. Wendell R. Brooks

        with a copy to:

        Akin, Gump, Strauss, Hauer & Feld, L.L.P.
        711 Louisiana, Suite 1900 South Tower
        Houston, Texas 77002
        Telecopy No.: (713) 236-0822
        Attn: Rick L. Burdick, Esq.

or at such other address as any party shall have furnished to the other parties
in writing.

7.6   SEPARABILITY.  In case any provision of the Agreement shall be invalid,
      illegal or unenforceable, the validity, legality and enforceability of the
      remaining provisions shall not in any way be affected or impaired thereby.

7.7   PUBLICITY.  So long as this Agreement is in effect, except as may be
      required by applicable law or requirements or applicable SEC or NASDAQ
      requirements, neither of the parties shall, nor shall it permit any of its
      respective Subsidiaries, employees, agents, or affiliates to, issue or
      cause the publication of any press release or other public announcement
      with respect to the transactions contemplated by this Agreement without
      the consent of the other party, which consent shall not be unreasonably
      withheld.

7.8   EXPENSES.  ERC shall pay all of the expenses and legal fees incurred with
      respect to this Agreement and the transactions contemplated hereby.

7.9   TITLES AND GENDER.  The titles of the Sections and Subsections of this
      Agreement are for convenience of reference only and are not to be
      considered in construing this Agreement. Whenever used herein, the
      singular member includes the plural, the plural includes the singular, and
      the use of either gender shall include both genders.

                                      -13-
<PAGE>
 
7.10  COUNTERPARTS.  This Agreement may be executed in counterparts, each of
      which shall be an original, but all of which together shall constitute one
      instrument.

7.11  DEFINITIONS.  Capitalized terms used in this Agreement shall have the
      following meanings:

      (a)  "Affiliate" means, with respect to any person, any other person
           directly or indirectly Controlling, Controlled by, or under common
           Control with such person. "Control" (including, with correlative
           meanings, the terms "Controlled by" and "under common Control with")
           as used with respect to any person, means possession, directly or
           indirectly, of the power to direct or cause the direction of the
           management and policies of such person, whether through ownership of
           voting securities, by contract or otherwise.

      (b)  "Closing" has the meaning set forth in Section 1.3.

      (c)  "Closing Date" has the meaning set forth in Section 1.3.

      (d)  "Disclosure Schedule" means the Disclosure Schedule dated the date
           hereof and delivered by ERC to Investor concurrently herewith.

      (e)  "ERC" means ERC Industries, Inc., a Delaware corporation.

      (f)  "ERC Common Stock" has the meaning set forth in the Preamble to this
           Agreement.

      (g)  "ERC Loss" has the meaning set forth in Section 6.2.

      (h)  "ERC SEC Reports" has the meaning set forth in Section 3.8.

      (i)  "ERC Shares" has the meaning set forth in Section 1.1(a).

      (j)  "ERC Stock Purchase Price" has the meaning set forth in Section
           1.2(a).

      (k)  "Exchange Act" has the meaning set forth in Section 3.8.

      (l)  "Government Entity" means any court, administrative agency or
           commission or government or governmental authority or
           instrumentality.

      (m)  "Investor" means John Wood Group PLC, a United Kingdom company
           registered in Scotland.

      (n)  "Investor Indemnified Parties" has the meaning set forth in Section
           6.1.

      (o)  "Investor Losses" has the meaning set forth in Section 6.1.

      (p)  "Lien" means any lien, mortgage, charge, encumbrance, security
           interest, claim or option of any nature.

                                      -14-
<PAGE>
 
      (q)  "Responsible Officer" means any one of Wendell R. Brooks or James
           Klima.

      (r)  "Stockholder Indemnitor" has the meaning set forth in Section 6.2.

      (s)  "Subsidiary" of any corporation means a business entity fifty percent
           or more of whose voting securities or similar economic interests are
           owned directly or indirectly by such corporation.

7.12  JURISDICTION; CONSENT TO SERVICE OF PROCESS; NO JURY TRIAL.

      (a)  Except as provided in the next paragraph, the parties hereto agree
           that all disputes between them arising out of, connected with,
           related to, or incidental to the relationship established between
           them pursuant to this Agreement, and whether arising in contract,
           tort, equity, or otherwise, shall be resolved only by state or
           federal courts located in Houston, Texas, but the parties hereto
           acknowledge that any appeals from those courts may have to be heard
           by a court located outside of Houston, Texas. Each of the parties
           hereto waives in all disputes any objection that it may have to the
           location of the court considering the dispute including, without
           limitation, any objection to the laying of venue or based on the
           grounds of forum non conveniens.

      (b)  Each of the parties hereto agrees that the other party to this
           Agreement shall have the right, to the extent permitted by applicable
           law, to proceed against it or its property in a court in any location
           reasonably selected in good faith to enable such other parties to
           realize on such property, or to enforce a judgment or other court
           order entered in favor of any such other party.  Each of the parties
           hereto waives any objection that it may have to the location of the
           court in which any other party to this Agreement has commenced a
           proceeding described in this paragraph including, without limitation,
           any objection to the laying of venue or based on the grounds of forum
           non conveniens.

      (c)  The parties hereto each waives any right to have a jury participate
           in resolving any dispute, whether sounding in contract, tort, or
           otherwise arising out of, connected with, related to or incidental to
           the relationship established between them pursuant to this Agreement.
           Instead, any disputes resolved in court will be resolved in a bench
           trial without a jury.


      IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed and delivered by their respective proper and duly authorized officers
as of the day and year first above written.

                                        ERC INDUSTRIES, INC.


                                        By: /s/ Wendell Brooks, President
                                            -----------------------------

                                      -15-
<PAGE>
 
                                        JOHN WOOD GROUP PLC


                                        By: /s/ J. Derek P. Jones, Director
                                            -------------------------------

                                      -16-

<PAGE>
 
                                  EXHIBIT "L"
                                  -----------


                        REGISTRATION  RIGHTS  AGREEMENT

    THIS REGISTRATION RIGHTS AGREEMENT ("AGREEMENT") is made and entered into as
of September 8, 1997, by and between ERC Industries, Inc., a Delaware
corporation (the "COMPANY") and John Wood Group PLC, a company incorporated in
the United Kingdom and registered in Scotland (the "INVESTOR").

                                   RECITALS:
                                   -------- 

    WHEREAS, the Company and the Investor have entered into an Investment
Agreement dated as of September 8, 1997 (the "INVESTMENT AGREEMENT"), pursuant
to which the Investor has acquired 6,250,000 shares (the "SHARES") of the
Company's $0.01 per share par value common stock (the "COMMON STOCK"); and

    WHEREAS, the Investor is willing to enter into the Investment Agreement and
to consummate the transactions contemplated by the Investment Agreement only if
the Company grants the registration rights provided in this Agreement; and

    WHEREAS, the Company has agreed to grant the registration rights provided
in this Agreement;

    NOW, THEREFORE, in consideration of the mutual promises and covenants set
forth herein, the parties hereby agree as follows:

    1.   CERTAIN DEFINITIONS.  As used in this Agreement, the following terms
shall have the meanings set forth below:

         "COMMISSION" shall mean the Securities and Exchange Commission or
    any other federal agency at the time administering the Securities Act.

         "INVESTOR" shall mean collectively, John Wood Group PLC, a company
    incorporated in the United Kingdom and registered in Scotland and any
    transferees of Registrable Securities from the Investor, provided such
    transfer complies with Section 3.2 of this Agreement.

         "REGISTRABLE SECURITIES" shall mean (i) the Shares, and (ii) any Common
    Stock issued or issuable at any time or from time to time in respect of the
    Shares upon a stock split, stock dividend, recapitalization or other similar
    event involving the Company.

         The terms "REGISTER," "REGISTERED", and "REGISTRATION" refer to a
    registration effected by preparing and filing a registration statement in
    compliance with the Securities Act, and the declaration or ordering by the
    Commission of the effectiveness of such registration statement.
<PAGE>
 
         "REGISTRATION EXPENSES" shall mean all expenses, other than Selling
    Expenses (as defined below), incurred by the Company in complying with
    Sections 2.1 and 2.2 hereof, including, without limitation, all
    registration, qualification and filing fees, exchange listing fees, printing
    expenses, escrow fees, fees and disbursements of counsel for the Company,
    blue sky fees and expenses and the expense of any special audits incident to
    or required by any such registration (but excluding the compensation of
    regular employees of the Company which shall be paid in any event by the
    Company).

         "SECURITIES ACT" shall mean the Securities Act of 1933, as amended, or
    any similar federal statute and the rules and regulations of the Commission
    thereunder, all as the same shall be in effect at the time.

         "SELLING EXPENSES" shall mean only the underwriting discounts, selling
    commissions and stock transfer taxes applicable to the securities registered
    by the Investor and all fees and disbursements of counsel for the Investor.

         "UNDERWRITTEN PUBLIC OFFERING" shall mean a public offering in which
    the Common Stock is offered and sold on a firm commitment or best efforts
    basis through one or more underwriters, all pursuant to an underwriting
    agreement between the Company and such underwriters.

    2.   REGISTRATION RIGHTS.

         2.1 DEMAND REGISTRATION RIGHTS. If the Company shall receive from the
    Investor at any time from and after the date of this Agreement a written
    request that the Company effect any registration with respect to all or a
    part of the Registrable Securities, the Company will use its best efforts to
    effect such registration within 120 days thereafter (including, without
    limitation, filing post-effective amendments, appropriate qualifications
    under applicable blue sky or other state securities laws, and appropriate
    compliance with the Securities Act) and as would permit or facilitate the
    sale and distribution of all or such portion of such Registrable Securities
    as are specified in such request. The Company shall not be required to
    effect more than two registrations pursuant to this Section 2.1.

         2.2  COMPANY REGISTRATION - "PIGGY-BACK REGISTRATION RIGHTS".

              (a) Notice of Registration. Subject to the terms hereof, if at
         any time or from time to time prior to the expiration of five (5)
         years from the date of this Agreement (except as otherwise provided
         in Section 3.2), the Company shall determine to register any of its
         Common Stock, for its own account relating to an Underwritten Public
         Offering, the Company shall:

                  (i)  promptly, but in any event at least 30 days before the
              Company files a registration statement pursuant to an Underwritten
              Public Offering, give to the Investor written notice thereof; and

                                      -2-
<PAGE>
 
                  (ii) include in such registration (and any related
              qualification under blue sky laws or other compliance), and in the
              underwriting involved therein, such Registrable Securities as the
              Investor may request in a writing delivered to the Company within
              20 days after the Investor's receipt of the Company's written
              notice delivered pursuant to Section 2.2(a)(i) above.

              (b) Underwriting. The right of the Investor to registration
         pursuant to Section 2.2 shall be conditioned upon the Investor's
         participation in such underwriting, and the inclusion of Registrable
         Securities in the underwriting shall be limited to the extent provided
         herein. The Investor and all other stockholders proposing to distribute
         their securities through such underwriting shall (together with the
         Company and the other holders distributing their securities through
         such underwriting) enter into an underwriting agreement in customary
         form with the managing underwriter selected for such underwriting by
         the Company. Subject only to the provisions of Section 2.2(c) below, if
         the managing underwriter determines that marketing factors require a
         limitation on the number of shares to be underwritten, the managing
         underwriter may limit some or all of the Registrable Securities that
         may be included in the registration and underwriting as follows: the
         number of Registrable Securities that may be included in the
         registration and underwriting by the Investor shall be determined by
         multiplying the number of shares of Registrable Securities of all
         selling stockholders of the Company which the managing underwriter is
         willing to include in such registration and underwriting, times a
         fraction, the numerator of which is the number of Registrable
         Securities requested to be included in such registration and
         underwriting by the Investor, and the denominator of which is the total
         number of Registrable Securities which all selling stockholders of the
         Company have requested to have included in such registration and
         underwriting (but taking into account for this purpose, only those
         stockholders of the Company who have been granted registration rights
         with respect to their shares of Common Stock. To facilitate the
         allocation of shares in accordance with the above provisions, the
         Company may round the number of shares allocable to any such person to
         the nearest 100 shares. If the Investor disapproves of the terms of any
         such underwriting, it may elect to withdraw therefrom by written notice
         to the Company and the managing underwriter, delivered not less than
         seven days before the effective date.

              (c) Subordination of Registration Rights. The registration rights
         granted pursuant to this Agreement shall not be subordinate to the
         registration rights granted to any other person or entity.

              (d) Right to Terminate Registration. The Company shall have the
         right to terminate or withdraw any registration initiated by it under
         this Section 2.2 prior to the effectiveness of such registration
         whether or not the Investor has elected to include its Registrable
         Securities in such registration, provided, however, that in such event,
         the Company shall promptly pay all reasonable out-of-pocket costs and
         expenses of the Investor (including, without limitation, all reasonable
         fees and disbursements of one law firm chosen to represent the
         Investor) incurred in connection with such terminated registration.

                                      -3-
<PAGE>
 
         2.3 EXPENSES OF REGISTRATION. All Registration Expenses incurred in
    connection with all registrations pursuant to Sections 2.1 and 2.2 shall be
    borne by the Company. Unless otherwise stated herein, all Selling Expenses
    relating to securities registered on behalf of the Investor shall be borne
    by the Investor.

         2.4 COMPANY'S OBLIGATIONS IN REGISTRATION. In the case of each
    registration, qualification or compliance effected by the Company pursuant
    to this Agreement, the Company will keep the Investor advised in writing as
    to the initiation of each registration, qualification and compliance and as
    to the completion thereof. At its expense, the Company will:

              (a) Prepare and file with the Commission a registration statement
         with respect to such securities and use its commercially reasonable
         best efforts to cause such registration statement to become and remain
         effective with respect to a registration statement filed regarding an
         Underwritten Public Offering, for the lesser of (i) 90 days or (ii)
         until the distribution described in such registration statement has
         been completed; and

              (b) Furnish to each underwriter such number of copies of a
         prospectus, including a preliminary prospectus, in conformity with the
         requirements of the Securities Act, and such other documents as such
         underwriter may reasonably request in order to facilitate the public
         sale of the shares by such underwriter, and promptly furnish to each
         underwriter and Investor notice of any stop-order or similar notice
         issued by the Commission or any state agency charged with the
         regulation of securities, and notice of any NASDAQ or securities
         exchange listing; and

              (c) Furnish prospectuses, including preliminary prospectuses and
         amendments and supplements thereto, to the Investor electing to sell
         any of its Registrable Securities pursuant to Section 2.2 hereof, all
         in accordance with applicable securities laws; and

              (d) Notify the Investor in the event that the Company becomes that
         a prospectus relating to the Registrable Securities contains a
         materially untrue statement or omits to state a material fact; and

              (e) Apply to register or otherwise qualify the Registrable
         Securities offered by the Investor under all applicable blue sky laws
         of any state.

         2.5  INDEMNIFICATION.

              (a) To the extent permitted by law, the Company will indemnify and
         hold harmless the Investor, each of its officers and directors and
         stockholders, and each person controlling the Investor within the
         meaning of Section 15 of the Securities

                                      -4-
<PAGE>
 
         Act, with respect to which registration, qualification or compliance
         has been effected pursuant to this Agreement, against all expenses,
         claims, losses, damages or liabilities (or actions in respect thereof)
         to the extent to which such person or entity is subject, including any
         of the foregoing incurred in settlement of any litigation, commenced or
         threatened, to the extent such expenses, claims, losses, damages or
         liabilities (or proceedings in respect thereof) arise out of or are
         based on any untrue statement (or alleged untrue statement) of a
         material fact contained in any registration statement, prospectus,
         offering circular or other document, any amendment or supplement
         thereto, incident to any such registration, qualification or
         compliance, or arise out of or are based on any omission (or alleged
         omission) to state therein a material fact required to be stated
         therein or necessary to make the statements therein, in light of the
         circumstances in which they were made, not misleading, or any violation
         by the Company of the Securities Act or any rule or regulation
         promulgated under the Securities Act applicable to the Company in
         connection with any such registration, qualification or compliance, and
         the Company will reimburse the Investor, each of its officers and
         directors and stockholders, and each person controlling the Investor
         for any legal and any other expenses reasonably incurred in connection
         with investigating, preparing or defending any such claim, loss,
         damage, liability or action, provided, however, that the indemnity
         contained herein shall not apply to amounts paid in settlement of any
         claim, loss, damage, liability or expense if settlement is effected
         without the consent of the Company (which consent shall not be
         unreasonably withheld); provided, further, that the Company will not be
         liable in any such case to the extent that any such claim, loss,
         damage, liability or expense arises out of or is based on any untrue
         statement or omission or alleged untrue statement or omission, made in
         reliance upon and in conformity with written information furnished to
         the Company expressly for inclusion in such registration by the
         Investor or such controlling person specifically for use therein.
         Notwithstanding the foregoing, insofar as the foregoing indemnity
         relates to any such untrue statement (or alleged untrue statement) or
         omission (or alleged omission) made in the preliminary prospectus but
         eliminated or remedied in the amended prospectus on file with the
         Commission at the time the registration statement becomes effective or
         in the final prospectus filed with the Commission pursuant to the
         applicable rules of the Commission or in any supplement or addendum
         thereto, the indemnity agreement herein shall not inure to the benefit
         of any underwriter or (if there is no underwriter) the Investor if a
         copy of the final prospectus filed pursuant to such rules, together
         with all supplements and addenda thereto, was not furnished to the
         person or entity asserting the loss, liability, claim or damage at or
         prior to the time such furnishing is required by the Securities Act.

              (b) To the extent permitted by law, the Investor will, if
         securities held by the Investor are included in the securities as to
         which such registration, qualification or compliance is being effected
         pursuant to the terms hereof, indemnify and hold harmless the Company,
         each of its directors and officers, each person who controls the
         Company within the meaning of Section 15 of the Securities Act, and
         each other person selling the Company's securities covered by such
         registration statement, each of such person's officers and directors
         and each person controlling such persons

                                      -5-
<PAGE>
 
         within the meaning of Section 15 of the Securities Act, against all
         claims, losses, damages and liabilities (or actions in respect thereof)
         to the extent to which such person or entity is subject, arising out of
         or based on any untrue statement (or alleged untrue statement) of a
         material fact contained in any such registration statement, prospectus
         offering circular or other document, or arising out of or based on any
         omission (or alleged omission) to state therein a material fact
         required to be stated therein or necessary to make the statements
         therein not misleading, or any violation by the Investor of any rule or
         regulation promulgated under the Securities Act applicable to the
         Investor and relating to any action or inaction required of the
         Investor in connection with any such registration, qualification or
         compliance, and will reimburse the Company, such other persons, such
         directors, officers, persons or control persons for any legal or other
         expenses reasonably incurred in connection with investigating or
         defending any such claim, loss, damage, liability or action, in each
         case to the extent, but only to the extent, that such untrue statement
         (or alleged untrue statement) or omission (or alleged omission) is made
         in such registration statement, prospectus, offering circular or other
         document in reliance upon and in conformity with information furnished
         to the Company by the Investor expressly for inclusion in such
         registration; provided, however, that the indemnity contained herein
         shall not apply to amounts paid in settlement of any claim, loss,
         damage, liability or expense if settlement is effected without the
         consent of the Investor (which consent shall not be unreasonably
         withheld). Notwithstanding the foregoing, insofar as the foregoing
         indemnity relates to any such untrue statement (or alleged untrue
         statement) or omission (or alleged omission) made in the preliminary
         prospectus but eliminated or remedied in the amended prospectus on file
         with the Commission at the time the registration statement becomes
         effective or in the final prospectus filed pursuant to applicable rules
         of the Commission or in any supplement or addendum thereto, the
         indemnity agreement herein shall not inure to the benefit of the
         Company, any underwriter or any other person if a copy of the final
         prospectus filed pursuant to such rules, together with all supplements
         and addenda thereto, was not furnished to the person or entity
         asserting the loss, liability, claim or damage at or prior to the time
         such furnishing is required by the Securities Act.

              (c) Each party entitled to indemnification under this Section 2.5
         (the "INDEMNIFIED PARTY") shall give notice to the party required to
         provide indemnification (the "INDEMNIFYING PARTY") promptly after such
         Indemnified Party has actual knowledge of any action or proceeding
         commenced against, or written demand made on any such party in respect
         of which indemnity may be sought, and shall permit the Indemnifying
         Party to assume the defense of any such claim or any litigation
         resulting therefrom, provided that counsel for the Indemnifying Party,
         who shall conduct the defense of such claim or litigation, shall be
         approved by the Indemnified Party (whose approval shall not be
         unreasonably withheld), and the Indemnified Party may participate in
         such defense at such party's expense, and provided further that the
         failure of any Indemnified Party to give notice as provided herein
         shall not relieve the Indemnifying Party of its obligations under this
         Agreement unless the failure to give such notice is materially
         prejudicial to an Indemnifying Party's ability to defend such action
         and provided further, that the

                                      -6-
<PAGE>
 
         Indemnifying Party shall not assume the defense for matters as to which
         there is a conflict of interest or as to which the Indemnifying Party
         is asserting separate or different defenses, which defenses are
         inconsistent with the defenses of the Indemnified Party. No
         Indemnifying Party, in the defense of any such claim or litigation,
         shall, except with the consent of each Indemnified Party, consent to
         entry of any judgment or enter into any settlement which 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. No Indemnified Party shall consent
         to entry of any judgment or enter into any settlement without the
         consent of each Indemnifying Party.

              (d) If the indemnification provided for in this Section 2.5 is
         unavailable to an Indemnified Party in respect of any losses, claims,
         damages or liabilities referred to therein, then each Indemnifying
         Party, in lieu of indemnifying such Indemnified Party, shall contribute
         to the amount paid or payable by such Indemnified Party as a result of
         such losses, claims, damages or liabilities (i) in such proportion as
         is appropriate to reflect the relative benefits received by the Company
         on the one hand and all stockholders offering securities in the
         offering (the "Selling Stockholders") on the other from the offering of
         the Company's securities, or (ii) if the allocation provided by clause
         (i) above is not permitted by applicable law, in such proportion as is
         appropriate to reflect not only the relative benefits referred to in
         clause (i) above but also the relative fault of the Company on the one
         hand and the Selling Stockholders on the other in connection with the
         statements or omissions which resulted in such losses, claims, damages
         or liabilities, as well as any other relevant equitable considerations.
         The relative benefits received by the Company on the one hand and the
         Selling Stockholders on the other shall be the net proceeds from the
         offering (before deducting expenses) received by the Company on the one
         hand and the Selling Stockholders on the other. The relative fault of
         the Company on the one hand and the Selling Stockholders on the other
         shall be determined by reference to, among other things, whether the
         untrue or alleged untrue statement of material fact or the omission or
         alleged omission to state a material fact relates to information
         supplied by the Company or by the Selling Stockholders and the parties'
         relevant intent, knowledge, access to information and opportunity to
         correct or prevent such statement or omission. The Company and the
         Selling Stockholders agree that it would not be just and equitable if
         contribution pursuant to this Section 2.5(d) were based solely upon the
         number of entities from whom contribution was requested or by any other
         method of allocation which does not take account of the equitable
         considerations referred to above in this Section 2.5(d). The amount
         paid or payable by an Indemnified Party as a result of the losses,
         claims, damages and liabilities referred to above in this Section
         2.5(d) shall be deemed to include any legal or other expenses
         reasonably incurred by such Indemnified Party in connection with
         investigating or defending any such action or claim, subject to the
         provisions of Section 2.5(c) hereof. No person guilty of fraudulent
         misrepresentation (within the meaning of Section 11(f) of the
         Securities Act) shall be entitled to contribution from any person who
         was not guilty of such fraudulent misrepresentation (within the meaning
         of Section 11(f) of the Securities Act).

                                      -7-
<PAGE>
 
         2.6 CERTAIN INFORMATION. The Investor agrees, with respect to any
    Registrable Securities included in any registration, to furnish to the
    Company such information regarding the Investor, the Registrable Securities
    and the distribution proposed by the Investor as the Company may reasonably
    request in writing and as shall be required in connection with any
    registration, qualification or compliance referred to in Section 2.2.

         2.7 RULE 144 REPORTING. With a view to making available the benefits of
    certain rules and regulations of the Commission which may at any time permit
    the sale of the Restricted Securities (used herein as defined in Rule 144
    under the Securities Act) to the public without registration, the Company
    agrees to use its best lawful efforts to:

              (a) Make and keep public information available, as those terms are
         understood and defined in Rule 144 under the Securities Act, at all
         times during which the Company is subject to the reporting requirements
         of the Securities Exchange Act of 1934, as amended (the "EXCHANGE
         ACT");

              (b) File with the Commission in a timely manner all reports and
         other documents required of the Company under the Securities Act and
         the Exchange Act (at all times during which the Company is subject to
         such reporting requirements); and

              (c) So long as the Investor owns any Restricted Securities, to
         furnish to the Investor forthwith upon request a written statement by
         the Company as to its compliance with the reporting requirements of
         said Rule 144 and with regard to the Securities Act and the Exchange
         Act (at all times during which the Company is subject to such reporting
         requirements), a copy of the most recent annual or quarterly report of
         the Company, and such other non-confidential reports and documents of
         the Company and other non-confidential information in the possession of
         or reasonably obtainable by the Company as the Investor may reasonably
         request in availing itself of any rule or regulation of the Commission
         allowing it to sell any such securities without registration.

    3.   MISCELLANEOUS.

         3.1 GOVERNING LAW. This Agreement shall be governed in all respects by
    the internal laws of the State of Texas. In the event any dispute arises
    between the parties, venue of any such dispute shall be proper only in
    Harris County, Texas.

         3.2 TRANSFERABILITY; TERMINATION. The registration rights contemplated
    herein are transferable by the Investor to any person or entity, in whole or
    in part, which acquires all or part of the shares which the Investor is
    acquiring pursuant to the Investment Agreement. The registration rights
    granted herein shall terminate, and the registration rights will not be
    exercisable by the Investor (or the Investor's lawful transferees pursuant
    to this Section 3.2) after said termination date, on the earlier of (i) the
    fifth anniversary date of this Agreement, or (ii) at such time as all shares
    of Registrable Securities held by the Investor

                                      -8-
<PAGE>
 
    may immediately be sold under Rule 144 (as amended from time to time)
    during any 90-day period.

         3.3 ENTIRE AGREEMENT; AMENDMENT. This Agreement constitutes the full
    and entire understanding and agreement between the parties with regard to
    the subject hereof. This Agreement, or any provision hereof, may be amended,
    waived, discharged or terminated only upon the written consent of the
    Company and those Investors (assuming the original Investor has transferred
    part of its Shares) who are the record holders of a majority of the Shares.

         3.4 NOTICES. All notices or other communications which are required or
    may be given under this Agreement shall be in writing and shall be deemed to
    have been duly given when delivered in person, transmitted by telecopier or
    mailed by registered or certified first class mail, postage prepaid, return
    receipt requested to the parties hereto at the address set forth below (as
    the same may be changed from time to time by notice similarly given) or the
    last known business or residence address of such other person as may be
    designated by either party hereto in writing.

         If to the Investor:

         John Wood Group PLC
         John Wood House
         Greenwell Road
         Aberdeen, AB1 4AX
         Scotland
         Attention: Group Financial Director
         Fax: 011-44-1-224-871997

         If to the Company:

         ERC Industries, Inc.
         16920 Park Row
         Houston, Texas  77084
         Attn.: Mr. Wendell R. Brooks, President
         Fax: 713/398-8086

         3.5 DELAYS OR OMISSIONS. Except as expressly provided herein, no delay
    or omission to exercise any right, power or remedy accruing to any party to
    this Agreement shall impair any such right, power or remedy of such party
    nor shall it be construed to be a waiver of any such breach or default, or
    an acquiescence therein, or of or in any similar breach or default
    thereafter occurring; nor shall any waiver of any single breach or default
    be deemed a waiver of any other breach or default theretofore or thereafter
    occurring. Any waiver, permit, consent or approval of any kind or character
    on the part of any party of any breach or default under this Agreement, or
    any waiver on the part of any party of any provisions or conditions of this
    agreement, must be in writing and shall be effective only to

                                      -9-
<PAGE>
 
    the extent specifically set forth in such writing. All remedies, either
    under this Agreement or by law or otherwise afforded to any party to this
    Agreement, shall be cumulative and not alternative.

         3.6 COUNTERPARTS. This Agreement may be executed in any number of
    counterparts, each of which shall be enforceable against the parties
    actually executing such counterparts, and all of which together shall
    constitute one instrument.

         3.7 SEVERABILITY. In the event that any provision of this Agreement
    becomes or is declared by a court of competent jurisdiction to be illegal,
    unenforceable or void, this Agreement shall continue in full force and
    effect without said provision.

         3.8 TITLES AND SUBTITLES. The titles and subtitles used in this
    Agreement are used for convenience only and are not considered in construing
    or interpreting this Agreement.

    IN WITNESS WHEREOF, the undersigned or each of their respective duly
authorized officers or representatives have executed this agreement effective
upon the date first set forth above.

                                     COMPANY:

                                     ERC INDUSTRIES, INC.
                                     a Delaware corporation


                                     By: /s/ Wendell R. Brooks, President
                                        ---------------------------------

                                     INVESTOR:

                                     JOHN WOOD GROUP PLC
                                     a U. K. company


                                     By: /s/ J. Derek P. Jones, Director
                                        ---------------------------------

                                      -10-


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