**Exhibit 4.1**

**SUPPLEMENTAL INDENTURE**

SUPPLEMENTAL INDENTURE(this “*Supplemental Indenture*”), dated as of October 3,2005, is entered into by and among Mueller Group Co-Issuer, Inc. (the “*Co-Issuer*”), a subsidiary of Mueller Group, LLC (the “*Company*”), the Company, the certain Guarantors (as definedin the Indenture referred to herein) and Law Debenture Trust Company of NewYork, as trustee under the Indenture 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, inconsideration of the foregoing and for other good and valuable consideration,the receipt of which is hereby acknowledged, the Co-Issuer and the Trusteemutually covenant and agree for the equal and ratable benefits of the Holdersof the Notes as follows:

1.     Capitalized Terms.   Capitalizedterms used herein without definition shall have the meanings assigned to themin the Indenture.

2.     Agreement to Co-Issue.   TheCo-Issuer hereby agrees to be deemed the co-issuer of the Notes under the termsand subject to the conditions set forth in the Indenture, and shall, jointlywith the Company, assume all obligations of the Company under the Notes, theIndenture and the Registration Rights Agreement.

3.     No Recourse Against Others.   No past, present or futuredirector, officer, employee, incorporator, stockholder or agent of theCo-Issuer, as such, shall have any liability for any obligations of the Companyor the Co-Issuer under the Notes, the Indenture or this Supplemental Indentureor for any claim based on, in respect of, or by any reason of, such obligationsor their creation. Each Holder of the Notes by accepting a Note waives andreleases all such liability. The waiver and release are part of theconsideration 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 number of copies of thisSupplemental Indenture. Each signed copy shall be an original, but all of themtogether represent the same agreement.

IN WITNESS WHEREOF,the parties hereto have caused this Supplemental Indenture to be duly executedand attested, 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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