[Code of Federal Regulations] [Title 29, Volume 4] [Revised as of July 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 29CFR1620.23] [Page 319] TITLE 29--LABOR CHAPTER XIV--EQUAL EMPLOYMENT OPPORTUNITY COMMISSION PART 1620_THE EQUAL PAY ACT--Table of Contents Sec. 1620.23 Collective bargaining agreements not a defense. The establishment by collective bargaining or inclusion in a collective bargaining agreement of unequal rates of pay does not constitute a defense available to either an employer or to a labor organization. Any and all provisions in a collective bargaining agreement which provide unequal rates of pay in conflict with the requirements of the EPA are null and void and of no effect.