Adjustable Back Pressure Relief Valve Body Material Stainless Steel Inlet Type FNPT Outlet Type FNPT Inlet Size 1 in Outlet Size 1 in Factory Set Pressure 55 psi Pressure Range 20 to 90 psi Disc Material Stainless Steel Overall Height 10 1/3 in Overall Length 6 1/2 in Seat Material Stainless Steel Spring Material Stainless Steel Temp Range 40 Degrees to 450 Degrees F Test Lever No Standards CRN CSA