July 8, 2004


Centrex, Inc.
9202 South Toledo Avenue
Tulsa, OK 74137

Dear Mr. Coughlin:

         We have been retained by Centrex, Inc. (the "Company"), in connection
with the Registration Statement on Form S-8 filed by the Company with the
Securities and Exchange Commission (the "Registration Statement") relating to
13,600,000 shares of common stock, par value $0.001 per share. You have
requested that we render an opinion as to whether the common stock as proposed
to be issued on the terms set forth in the Registration Statement will be
validly issued, fully paid and non-assessable.

         We have examined such other corporate records and documents and have
made such other examinations as we deemed relevant. We have also discussed the
documents examined and relied upon in rendering this opinion with one or more
directors and executive officers of the Company, and in all instances, have
assumed the genuineness of all signatures, the legal capacity of natural
persons, the authenticity of all documents submitted as originals, the
conformity with the original documents of all documents submitted as certified
or photostatic copies and the authenticity of the originals of such copies. We
have further assumed that the recipients of these Securities under the plan will
have paid the consideration required under the terms of the Plan prior to the
issuance of the Securities, and that none of the services performed by the
recipients shall be related to "capital raising" transactions.

         Based upon the above examination, we are of the opinion that the shares
of common stock proposed to be issued pursuant to the Registration Statement,
are validly authorized and, when issued in accordance with the terms set forth
in the Registration Statement, will be validly issued, fully paid, and
non-assessable.

         This opinion is expressly limited in scope to the Securities described
herein and which are to be expressly covered by the above referenced
Registration Statement and does not cover any subsequent issuances of any
securities to be made in the future pursuant to any other plans, if any,
pertaining to services performed in the future. Any such transactions are
required to be included in a new registration statement or a post-effective
amendment to the above referenced Registration Statement, which will be required
to include a revised or a new opinion concerning the legality of the Securities
to be issued.

         We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement; however, this opinion is not to be used, circulated,
quoted or otherwise referred to for any other purpose without our prior written
consent. In giving this consent, we do not thereby concede that we come within
the categories of persons whose consent is required by the Securities Act of
1933 or the General Rules and Regulations promulgated thereunder.

Sincerely,

/s/ RONALD C. KAUFMAN

Ronald C. Kaufman
Kaufman & Associates, PLLC