Water Hammer Arrester, HydraRester Collection, 1/2 inch MIP Connection, 300 psi Factory Set Pressure, Working Temperature Rating: 250 Deg F, 6-1/2 inch (Male Thread), 8-1/4 inch (Male Sweat), 7-1/2 inch (CPVC), 6-1/2 inch (PEX Crimp) Overall Height, 1-3/8 inch (Chamber) Width, Type L Copper Tube (Arrester Body), Poly Piston With Two EPDM O-Rings (Piston), Copper MIP Thread (Male Thread Fitting), Dow-Corning, 111 FDA Approved Silicone Compound (Piston Lubrication), Standards: ASSE Listed