Make a quick 90 deg transition from polybutylene to a different pipe type. Color-coordinated collars on the Brass Push Polybutylene 90deg Transition Elbow help to identify which side goes with which pipe - the gray collar end is compatible with polybutylene pipe and the tan collar end is compatible with PEX, copper, CPVC, PE-RT and SDR-9 HDPE pipe. Innovative push-to-connect technology for quick and easy installation, even in tight spaces.