Water Hammer Arrestor, Body Material Copper with Low-Lead Brass Adapter, Connection Type MNPT, Pipe Size 1/2 in, Factory Set Pressure 60 psi, Overall Height 5 15/16 in, Diameter 1 1/8 in, Max. Pressure 150 psi, Temp. Range 33 Degrees to 180 Degrees F, Standards ASSE1010,ANSI A112.26.1M, PDI WH201