ZurnPEX® QickSert CR™ Barb x female thread swivel adapter. The QQPSFC__X adapter is used to transition from PEX to the 1 male pipe threads of the ZurnPEX® QickPort® manifolds. Barb molded from Acudel®. These fittings, as a system with Zurn PEX® tube, are pressure rated at 160 PSI at 73 degF, 100 PSI at 180 degF, and 80 PSI at 200 degF. These fittings are listed by NSF as complying with the following standards: NSF/ANSI Standard 14, NSF/ ANSI Standard 61, ASTM F877, and CSA B137.5, and ASTM F2159.