1/2" Push Fit x 1/2" 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 200 PSI and 200 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.