Adjustable Back Pressure Relief Valve Body Material Cast Iron Inlet Type FNPT Outlet Type FNPT Inlet Size 1 1/4 in Outlet Size 1 1/4 in Factory Set Pressure 8 psi Disc Material Stainless Steel Overall Height 10 1/4 in Overall Length 6 1/2 in Seat Material Monel Spring Material Stainless Steel Temp Range 40 Degrees to 450 Degrees F Test Lever No Standards CRN CSA