Water Hammer Arrestor Body Material Copper Connection Type Threaded Pipe Size 1 in Factory Set Pressure 60 psi Overall Height 8 3/4 in Diameter 1 3/8 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 Rand T File No 8477 (NSF/ANSI 372)