Steam Safety Relief Valve Body Material Bronze Inlet Type MNPT Outlet Type FNPT Inlet Size 1 in Outlet Size 1 in Factory Set Pressure 15 psi Steam Capacity (Lb./Hr.) 643 lb/hr Disc Material Non-Stick PTFE Overall Height 3 1/8 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