Safety Relief Valve, Body Material Brass/Bronze, Inlet Type MNPT, Outlet Type FNPT, Inlet Size 1 1/2 in, Outlet Size 1 1/2 in, Factory Set Pressure 300 psi, Disc Material Stainless Steel, Overall Height 9 1/4 in, Application Air, Gas, Overall Length 9 1/4 in, Seat Material Brass/Stainless Steel, Spring Material Stainless Steel, Temp. Range -320 Degrees to 406 Degrees F, Test Lever Yes, Standards ASME Section VIII / CRN