Used to connect PEX-A pipe to brass and poly expansion fittings. Chamfer makes for easy insertion, and the sleeve's stop accurately positions sleeve ring on pipe to ensure proper installation. Interior cross hatch stops ring from sliding off pipe. Warning: This product can expose you to chemics including Carbon-black extracts, which is known to the State of California to cause cancer, and Bisphenol A (BPA), which is known to the state of California to cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov. -