Exhibit 5




                            Willkie Farr & Gallagher
                               787 Seventh Avenue
                               New York, NY 10019

June 26, 2002

Mueller Industries, Inc.
8285 Tournament Drive
Suite 150
Memphis, Tennessee  38125

Ladies and Gentlemen:

We have acted as counsel to Mueller Industries, Inc. (the "Company"), a
corporation organized under the laws of the State of Delaware, with respect to
the Company's Form S-8 Registration Statement (the "Registration Statement") to
be filed by the Company with the Securities and Exchange Commission on or about
June 26, 2002 in connection with the registration under the Securities Act of
1933, as amended (the "Act"), by the Company of 750,000 shares of common stock,
par value $.01 per share (the "Common Stock"), which are issuable upon the
exercise of stock options granted or to be granted under the Mueller Industries,
Inc. 2002 Stock Option Plan (the "Plan").

As counsel for the Company, we have examined, among other things, such Federal
and state laws and originals and/or copies (certified or otherwise identified to
our satisfaction) of such documents, certificates and records as we deemed
necessary and appropriate for the purpose of preparing this opinion.

Based on the foregoing, we hereby inform you that in our opinion the shares of
Common Stock issuable upon exercise of stock options granted or to be granted
under the Plan have been duly and validly authorized for issuance and, when
originally issued in accordance with the terms of the Plan for consideration in
excess of $.01 per share, will be validly issued, fully paid and nonassessable.

We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement. In giving such consent, we do not hereby admit that we
come within the category of persons whose consent is required under Section 7 of
the Act or the rules and regulations of the Securities and Exchange Commission.

This opinion is limited to the General Corporation Law of the State of Delaware
and the federal laws of the United States of America.

Very truly yours,

/s/ Willkie Farr & Gallagher