3/4" Push Fit x 3/4" Polybutylene , PF X PB Conversion Couplings allow you to connect Polybutylene pipe to CPVC, PEX and Copper. Designed to simplify pipe installation. Instant push-fit connection for increased ease-of-use- no soldering required. Fittings certified to 2 PSI and 2 degrees F (93 degrees C). Fits OD controlled copper, CPVC, or PEX pipe. Design certified and agency listed. Compact, corrosion resistant, robust DZR brass body.