FOURTH AMENDMENT to SECOND AMENDED AND RESTATED CREDITAGREEMENT

Exhibit 4.1

FOURTH AMENDMENT

to

SECOND AMENDED AND RESTATED CREDIT AGREEMENT

This FOURTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (the “Amendment”), dated as of March 31, 2005, by and among THERMADYNE INDUSTRIES, INC., a Delaware corporation (“Industries”), THERMAL DYNAMICS CORPORATION, a Delaware corporation (“Dynamics”), TWECO PRODUCTS, INC., a Delaware corporation (“Tweco”), VICTOR EQUIPMENT COMPANY, a Delaware corporation (“Victor”), C & G SYSTEMS, INC., an Illinois corporation (“C & G”), STOODY COMPANY, a Delaware corporation (“Stoody”), THERMAL ARC, INC., a Delaware corporation (“Thermal Arc”), PROTIP CORPORATION, a Missouri corporation (“ProTip”), THERMADYNE INTERNATIONAL CORP., a Delaware corporation (“International”, and collectively with ProTip, Thermal Arc, Stoody, C & G, Victor, Tweco, Dynamics and Industries, the “Borrowers”), the other persons designated as Credit Parties on the signature pages hereof, GENERAL ELECTRIC CAPITAL CORPORATION, a Delaware corporation (“Agent”) and the Persons signatory thereto from time to time as Lenders.  Unless otherwise specified herein, capitalized terms used in this Amendment shall have the meanings ascribed to them in Annex A to the Credit Agreement (as hereinafter defined).

RECITALS

WHEREAS, the Borrowers, the Credit Parties, Agent and Lenders have entered into that certain Second Amended and Restated Credit Agreement dated as of November 22, 2004 (as further amended, supplemented, restated or otherwise modified from time to time, the “Credit Agreement” ); and

WHEREAS, the Borrowers have requested that Requisite Lenders amend and restate certain Financial Covenants;

NOW THEREFORE, in consideration of the mutual execution hereof and other good and valuable consideration, the parties hereto agree as follows:

1.             Amendment and Restatement of Section (iv) of Clause (a) of Annex G.  Section (iv) of Clause (a) of Annex G of the Credit Agreement is hereby amended and restated in its entirety to read as set forth below:

(iv)          Maximum Leverage Ratio.  Until such time as the Second Lien Loan Obligations have been paid in full in accordance with Section 6.3(b)(vi) or refinanced in accordance with Section 5.13 (provided, however, that if after such payment in full or refinancing, Borrowing Availability is at any time less than $15,000,000 this Financial Covenant shall be reinstated until the Commitment Termination Date), Holdings and its Subsidiaries on a consolidated basis shall have, at the end of each Fiscal Quarter set forth below, a Leverage Ratio as of the last day of such Fiscal Quarter and for the 12-month period then ended of not more than the following:

5.00 for the Fiscal Quarter ending December 31, 2003;

5.00 for the Fiscal Quarter ending March 31, 2004;

5.00 for the Fiscal Quarter ending June 30, 2004;

5.50 for the Fiscal Quarter ending September 30, 2004;

6.18 for the Fiscal Quarter ending December 31, 2004;

6.70 for the Fiscal Quarter ending March 31, 2005;

6.60 for the Fiscal Quarter ending June 30, 2005;

6.00 for the Fiscal Quarter ending September 30, 2005;

5.15 for the Fiscal Quarter ending December 31, 2005;

5.00 for the Fiscal Quarter ending March 31, 2006; and

4.00 for each Fiscal Quarter ending thereafter.”

2.             Representations and Warranties of Credit Parties.  The Credit Parties represent and warrant that:

(a)           the execution, delivery and performance by the Credit Parties of this Amendment have been duly authorized by all necessary corporate action required on its part and this Amendment is a legal, valid and binding obligation of the Credit Parties enforceable against the Credit Parties in accordance with its terms except as the enforcement thereof may be subject to (i) the effect of any applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting creditors’ rights generally and (ii) general principles of equity (regardless of whether enforcement is sought in a proceeding in equity or at law); and

(b)           after giving effect to this Amendment, each of the representations and warranties contained in the Credit Agreement is true and correct in all material respects on and as of the date hereof as if made on the date hereof, except to the extent that such representations and warranties expressly relate to an earlier date.

3.             Conditions To Effectiveness.  This Amendment shall be effective upon the following (all in form and substance satisfactory to Agent):

(a)           execution and delivery of this Amendment by the Requisite Lenders and the Credit Parties; and

(b)           the Agent shall have received a copy of a fully executed and delivered amendment, in form and substance reasonably satisfactory to Agent, to that certain Second Lien Credit Agreement, dated as of July 29, 2004 (the “SCIL Agreement”), by and among the Borrowers, Credit Suisse First Boston and the other Persons signatory thereto; and

(c)           payment in full of all fees, costs and expenses, including the reasonable fees, costs and expenses of counsel or other advisors for advice, assistance, or other representation in connection with this Amendment, as provided in Section 11.3(a) of the Credit Agreement.

2

4.             Reference To And Effect Upon The Credit Agreement.

(a)           The Credit Agreement and the other Loan Documents shall remain in full force and effect, as amended hereby, and are hereby ratified and confirmed.

(b)           The execution, delivery and effectiveness of this Amendment shall not operate as a waiver of any right, power or remedy of Agent or any Lender under the Credit Agreement or any Loan Document, nor constitute a waiver or amendment of any provision of the Credit Agreement or any Loan Document, except as specifically set forth herein.  Upon the effectiveness of this Amendment, each reference in the Credit Agreement to “this Credit Agreement,” “hereunder,”  “hereof,” “herein” or words of similar import shall mean and be a reference to the Credit Agreement as amended hereby.

5.             Governing Law.  THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS (AS OPPOSED TO CONFLICTS OF LAWS PROVISIONS) OF THE STATE OF NEW YORK.

6.             Headings.  Section headings in this Amendment are included herein for convenience of reference only and shall not constitute a part of this Amendment for any other purposes.

7.             Counterparts.  This Amendment may be executed in any number of counterparts, each of which when so executed shall be deemed an original, but all such counterparts shall constitute one and the same instrument.

8.             Reaffirmation of Guaranties.  The Credit Parties signatory hereto hereby reaffirm their Guaranties of the Obligations, taking into account the provisions of this Amendment.

[Signature pages follow]

3

IN WITNESS WHEREOF, the parties hereto have executed and delivered this Amendment as of the date first written above.