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 defined in the Indenture referred to
herein) and Law Debenture Trust Company of New York, 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 and
delivered to the Trustee an indenture (the “Indenture”),
dated as of April 23, 2004, providing for the issuance of 10% Senior
Subordinated Notes due 2012 (the “Notes”);


WHEREAS, the Company has converted to a limited
liability company, and the Indenture provides that under certain circumstances
the Co-Issuer shall execute and deliver to the Trustee a supplemental indenture
pursuant to which the Co-Issuer shall become a co-issuer of the Notes;


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


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


1.     CAPITALIZED
TERMS.   Capitalized terms used herein without definition shall have the
meanings assigned to them in the Indenture.


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


3.     NO
RECOURSE AGAINST OTHERS.   No
past, present or future director, officer, employee, incorporator, stockholder
or agent of the Co-Issuer, as such, shall have any liability for any
obligations of the Company or the Co-Issuer under the Notes, the Indenture or
this Supplemental Indenture or for any claim based on, in respect of, or by any
reason of, such obligations or their creation. Each Holder of the Notes by
accepting a Note waives and releases all such liability. The waiver and release
are part of the consideration for issuance of the Notes.


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


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











IN WITNESS WHEREOF, the
parties hereto have caused this Supplemental Indenture to be duly executed and
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