Range 40 Degrees to 450 Degrees F, Test Lever No, Standards CRN, CSA Adjustable Back Pressure Relief Valve, Body Material Cast Iron, Inlet Type FNPT, Outlet Type FNPT, Inlet Size 1/2 in, Outlet Size 1/2 in, Factory Set Pressure 13 psi, Disc Material Stainless Steel, Overall Height 6 3/4 in, Overall Length 4 3/4 in, Seat Material Monel, Spring Material Stainless Steel, Temp.