Water Hammer Arrestor Body Material Copper Connection Type Threaded Pipe Size 1/2 in Factory Set Pressure 60 psi Overall Height 6 7/8 in Diameter 1 1/8 in Max Pressure 350 psi Temp Range 33 Degrees to 250 Degrees F Standards Asse Standard 1010 File No 4785 IAPMO Listed Compliance Lead Plumbing Law Certified By IAPMO R and T File No 8477 (NSF/ANSI 372)