Steam Safety Relief Valve, Body Material Bronze, Inlet Type MNPT, Outlet Type FNPT, Inlet Size 3/4 in, Outlet Size 3/4 in, Factory Set Pressure 15 psi, Steam Capacity (Lb./Hr.) 450 lb/hr, Disc Material Non-Stick PTFE, Overall Height 2 13/16 in, Application Steam Boiler, Overall Length 2 3/8 in, Seat Material Metal, Spring Material Stainless Steel, Temp. Range 250 Degrees F, Test Lever Yes, Compliance ASME and HV, NB