Safety Relief Valve, Body Material Bronze, Inlet Type FNPT, Outlet Type FNPT, Inlet Size 1 1/2 in, Outlet Size 1 1/2 in, Factory Set Pressure 50 psi, Pressure Range 15 to 160 psi, 4,604,000 BtuH, Disc Material Brass ASTM B16, Overall Height 10 3/4 in, Application Hot Water Heating Boilers and Hot Water Supply Systems, Overall Length 5 7/8 in, Seat Material Silicone, Spring Material Plated Alloy Steel, Temp. Range 0 Degrees to 250 Degrees F, Test Lever Yes, Standards ASME Section IV, CRN, CSA