Water Hammer Arrestor, Mini-Rester ™ Collection, 1/2 inch Pipe, Male Connection, Factory Set Pressure: 350 psi Maximum Working, 2900 psi Burst Tested, Working Temperature Rating: 250 Deg F, CPVC Clamshell, Type L Copper Tube Body, Poly Piston With Two EPDM O-Rings, Low Lead Compliant Standards: Listed By UPC/IAPMO To Meet UPC-2009, Certified By ASSE To The ANSI/ASSE 1010-2004, Conforms To IPC-2009