Safety Relief Valve, Body Material Bronze, Inlet Type MNPT, Outlet Type FNPT, Inlet Size 1 1/4 in, Outlet Size 1 1/2 in, Factory Set Pressure 50 psi, Disc Material B21 Alloy 485, Overall Height 9 5/8 in, Application Pressure Reducing Stations etc, Steam Boiler and Generators, Overall Length 5 1/4 in, Seat Material EPR, Spring Material Stainless Steel, Temp. Range -60 Degrees to 406 Degrees F, Test Lever Yes, Standards ASME Section 1, ASTM A-313 TY 631, National Board Certified, Steam