EXHIBIT 34













                                 December 5, 1995



         Praxair, Inc.
         39 Old Ridgebury Road
         Danbury, Connecticut  06810-5113

         Gentlemen:

                   You have requested information concerning CBI Indus-
         tries, Inc. (the "Company") in connection with a possible
         transaction with the Company or its shareholders.  Except as
         required by law or judicial process, you will treat confiden-
         tially any information furnished to you by or on behalf of the
         Company (the "Evaluation Material"; provided, however, that the
         term "Evaluation Material" does not include, and your confiden-
         tiality obligations hereunder do not apply to, information
         which was or becomes generally available on a non-confidential
         basis or information which is available to you or becomes
         available to you from a third party not known by you to be un-
         der any obligation of confidentiality).  The Company is pre-
         pared to provide you access to Evaluation Material on a compa-
         rable basis to the access provided to other third parties.

                   You will not use the Evaluation Material in any way
         detrimental to the Company or its shareholders; provided, how-
         ever, that you may disclose any Evaluation Material to your
         directors, officers, employees, agents, advisors or financial
         institutions which are potential financing sources who need to
         know such information for the purpose of evaluating the trans-
         action (it being understood that they shall be informed by you
         of the confidential nature of such information and that by re-
         ceiving such information they are agreeing to be bound by this
         agreement). 

                   In the event that you are requested in any proceeding
         to disclose any Evaluation Material, you will give the Company
         prompt notice of such request so that the Company may seek an
         appropriate protective order.  If in the absence of a protec-
         tive order you are nonetheless compelled by an order of a court
         of competent jurisdiction to disclose Evaluation Material, you
         may disclose such information without liability hereunder; pro-
         vided, however, that you give the Company written notice of the
         information to be disclosed as far in advance of its disclosure
         as is practicable and, upon the Company's request and at the



         Praxair, Inc.
         December 5, 1995
         page 2


         Company's expense, use your reasonable efforts to obtain assur-
         ances that confidential treatment will be accorded to such in-
         formation.

                   You hereby acknowledge that you are aware of the re-
         strictions imposed by the United States securities laws on any
         person who has received from an issuer material, non-public
         information from purchasing or selling securities of such is-
         suer or from communicating such information to any other person
         under circumstances in which it is reasonably foreseeable that
         such person is likely to purchase or sell such securities in
         reliance upon such information.

                   Notwithstanding anything in this agreement to the
         contrary, you and your affiliates shall be entitled to disclose
         certain Evaluation Material, or summaries thereof, in filings
         made pursuant to the Securities Exchange Act of 1934, as
         amended (the "Exchange Act"), in connection with the current
         tender offer, dated November 3, 1995, by PX Acquisition Corp.
         for securities of the Company as such offer may be amended from
         time to time (the "Offer"), if you reasonably believe such dis-
         closure is required by the Exchange Act in connection with con-
         tinuing or consummating the Offer.

                   You agree that neither you nor any of your affiliates
         shall acquire any securities of the Company pursuant to the
         Offer or otherwise at any time prior to January 15, 1996, or
         such earlier time as the Company enters into a definitive
         agreement with any party or parties, including you, with re-
         spect to a transaction or transactions for the acquisition of
         all or a majority of the Company's assets or securities.

                   You shall not make any disclosure concerning the fact
         that you are having or have had discussions with the Company,
         and the Company will not make disclosure of such discussions
         which identifies you or your affiliates as parties thereto,
         except as the party making such disclosure reasonably believes
         is required by law.

                   During the period you and your affiliates are pre-
         cluded by this agreement from acquiring any securities of the
         Company, you and your affiliates will not, directly or indi-
         rectly, enter into any discussions, negotiations, arrangements
         or understandings with any third party with respect to such
         third party acquiring or seeking to acquire any of the
         Company's assets or businesses or any securities issued by the
         Company or any rights or options to acquire such ownership;
         provided, however, that the foregoing shall not be deemed
         breached by you by reason of unsolicited contacts of you by a
         third party with respect to any of the foregoing matters so
         long as your response thereto is confined to advising such



         Praxair, Inc.
         December 5, 1995
         page 3


         third party that you are not in a position to discuss such mat-
         ters; and provided, further, that the foregoing shall not pre-
         clude you from having discussions with potential buyers and
         others concerning the disposition by you of a portion or por-
         tions of the Company's industrial gas business to the extent
         such disposition by you may be reasonably necessary to resolve
         antitrust or similar issues, if any.

                   For two years from the date hereof you will not, ex-
         cept with the prior consent of the Company, (i) initiate con-
         tact (except for those contacts made in the ordinary course of
         business) with any executive or key employee of the Company
         regarding its business, operations, prospects or finances, and
         (ii) directly solicit for hire any person with whom you have
         had contact during the course of your investigation relating to
         a possible transaction with the Company or its shareholders and
         known to you to be employed by the Company in an executive ca-
         pacity.

                   Notwithstanding anything in this agreement to the
         contrary, the Company agrees that if any Evaluation Material is
         provided to any other party in connection with a possible
         transaction with the Company or its shareholders on terms as
         regards the matters described in this agreement which are less
         restrictive to such other party than those contained in this
         agreement are to you, then this agreement will be deemed to
         have been modified to provide you with the benefit of such less
         restrictive terms, and the Company will provide you with an
         amended agreement reflecting such terms.  

                   Upon the Company's request you will promptly rede-
         liver to the Company or destroy all copies of the Evaluation
         Material and will destroy all memoranda, notes and other writ-
         ings prepared by you or your directors, officers, employees,
         agents or affiliates based on the Evaluation Material.  You
         understand that neither the Company nor any of its representa-
         tives or advisors makes any representation or warranty as to
         the accuracy or completeness of any Evaluation Material which
         may be furnished to you.  You agree that neither the Company
         nor its representatives or advisors shall have any liability to
         you or any of your representatives resulting from the use of
         the Evaluation Material.

                   You and the Company agree that money damages would
         not be a sufficient remedy for any breach of this agreement by
         you or the Company or your or the Company's directors, offic-
         ers, employees, agents or affiliates, and that in addition to
         all other remedies the Company or you, as the case may be,
         shall be entitled to specific performance and injunctive or
         other equitable relief as a remedy for any such breach, and you
         and the Company further agree to waive and to use your or the



         Praxair, Inc.
         December 5, 1995
         page 4


         Company's reasonable efforts to cause your or the Company's
         directors, officers, employees, agents or affiliates to waive,
         any requirements for the securing or posting of any bond in
         connection with such remedy.

                   This agreement shall be governed by and construed in
         accordance with the laws of the State of Delaware, without giv-
         ing effect to its conflict of laws principles or rules.

                   This agreement shall terminate upon the second an-
         niversary hereof.

                   If you are in agreement with the foregoing, please so
         indicate by signing and returning one copy of this agreement
         which will constitute an agreement between you and the Company
         with respect to the matters set forth herein.

                                       Very truly yours,

                                       CBI INDUSTRIES, INC.



                                       By: /s/John E. Jones        


         Confirmed and Agreed to:

         PRAXAIR, INC.



         By: /s/David H. Chaifetz
             Name:
             Title: