Water Hammer Arrestor, Mini-Rester ™ Collection, 1/2 inch Pipe, Male Sweat Connection, Factory Set Pressure: 350 psi Maximum Working, 2900 psi Burst Tested, Working Temperature Rating: 250 Deg F, 3-3/8 inch Overall Height, 7/8 inch Chamber Width, 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, For use with Press-Fitting Systems, Such As Viega Propress™ And All Push-Fitting Systems