Safety Relief Valve, Body Material Iron, Inlet Type FNPT, Outlet Type FNPT, Inlet Size 3/4 in, Outlet Size 1 in, Factory Set Pressure 30 psi, Pressure Range 30 to 75 psi, 925,000 BtuH, Disc Material Buna-N, Overall Height 5 5/8 in, Application For Pressure Protection of Hot Water Heating Boilers, Overall Length 3 in, Seat Material Metal, Spring Material Brass, Temp. Range 0 Degrees to 250 Degrees F, Test Lever Yes