**Exhibit 4.1**

**SUPPLEMENTAL INDENTURE**

SUPPLEMENTAL INDENTURE (this “*SupplementalIndenture*”), dated as of October 3, 2005, is entered into byand among Mueller Group Co-Issuer, Inc. (the “*Co-Issuer*”),a subsidiary of Mueller Group, LLC (the “*Company*”), theCompany, the certain Guarantors (as defined in the Indenture referred toherein) and Law Debenture Trust Company of New York, as trustee under theIndenture referred to below (the “*Trustee*”).

W I T N E S S E T H

WHEREAS, the Company has heretofore executed anddelivered to the Trustee an indenture (the “*Indenture*”),dated as of April 23, 2004, providing for the issuance of 10% SeniorSubordinated Notes due 2012 (the “*Notes*”);

WHEREAS, the Company has converted to a limitedliability company, and the Indenture provides that under certain circumstancesthe Co-Issuer shall execute and deliver to the Trustee a supplemental indenturepursuant to which the Co-Issuer shall become a co-issuer of the Notes;

WHEREAS, pursuant to Section 9.01 of theIndenture, the Trustee is authorized to execute and deliver this SupplementalIndenture.

NOW, THEREFORE, in consideration of the foregoing andfor other good and valuable consideration, the receipt of which is herebyacknowledged, the Co-Issuer and the Trustee mutually covenant and agree for theequal and ratable benefits of the Holders of the Notes as follows:

1.     CAPITALIZEDTERMS.   Capitalized terms used herein without definition shall have themeanings assigned to them in the Indenture.

2.     AGREEMENTTO CO-ISSUE.   The Co-Issuer hereby agrees to be deemed the co-issuer ofthe Notes under the terms and subject to the conditions set forth in theIndenture, and shall, jointly with the Company, assume all obligations of theCompany under the Notes, the Indenture and the Registration Rights Agreement.

3.     NORECOURSE AGAINST OTHERS.   Nopast, present or future director, officer, employee, incorporator, stockholderor agent of the Co-Issuer, as such, shall have any liability for anyobligations of the Company or the Co-Issuer under the Notes, the Indenture orthis Supplemental Indenture or for any claim based on, in respect of, or by anyreason of, such obligations or their creation. Each Holder of the Notes byaccepting a Note waives and releases all such liability. The waiver and releaseare part of the consideration for issuance of the Notes.

4.     NEW YORKLAW TO GOVERN.   THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN ANDBE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE WITHOUT GIVING EFFECT TO THEAPPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OFTHE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

5.     COUNTERPARTS.   The parties may sign any numberof copies of this Supplemental Indenture. Each signed copy shall be anoriginal, but all of them together represent the same agreement.

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IN WITNESS WHEREOF, theparties hereto have caused this Supplemental Indenture to be duly executed andattested, all as of the date above first written.

|        | MUELLER GROUP, LLC |
|--------|--------------------|
|   |               |   |
|   | By:                | /s/ MILES C.  DEARDEN |
|   |               | Name: | Miles C. Dearden |
|   |               | Title: | Vice President |
|   |               |   |
|   |               | MUELLER GROUP CO-ISSUER, INC. |
|   |               |   |
|   | By:                | /s/ JOSEPH J.  TROY |
|   |               | Name: | Joseph J. Troy |
|   |               | Title: | President |
|   |               |   |
|   |               | ANVILSTAR LLC |
|   |               | MUELLER  INTERNATIONAL, INC. |
|   |               | MUELLER INTERNATIONAL,  L.L.C. |
|   |               | MUELLER INTERNATIONAL  FINANCE, INC. |
|   |               | MUELLER INTERNATIONAL FINANCE, L.L.C. |
|   |               |   |
|   | By:                | /s/ THOMAS E.  FISH |
|   |               | Name: | Thomas E. Fish |
|   |               | Title: | Authorized Person |
|   |               |   |
|   |               | ANVIL  INTERNATIONAL, INC. |
|   |               | MUELLER SERVICE CO. |
|   |               | HERSEY METERS CO. |
|   |               | HENRY PRATT COMPANY |
|   |               | HENRY PRATT INTERNATIONAL  LTD. |
|   |               | HYDRO GATE ACQUISITION CORP. |
|   |               | J.B. SMITH MFG CO. |
|   |               | JAMES JONES COMPANY |
|   |               | MILLIKEN ACQUISITION CORP. |
|   |               | MUELLER CO. |
|   |               |   |
|   | By:                | /s/ THOMAS E.  FISH |
|   |               | Name: | Thomas E. Fish |
|   |               | Title: | Authorized Person |
|   |               |   |
|   |               | LAW DEBENTURE TRUST COMPANY  OF NEW YORK |
|   |               |   |
|   | By:                | /s/ PATRICK J.  HEALY |
|   |               | Name: | Patrick J. Healy |
|   |               | Title: | Vice President |

 

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