Adjustable Back Pressure Relief Valve Body Material Cast Iron Inlet Type FNPT Outlet Type FNPT Inlet Size 2 in Outlet Size 2 in Factory Set Pressure 231 psi Disc Material Stainless Steel Overall Height 11 in Overall Length 7 1/2 in Seat Material Monel Spring Material Stainless Steel Temp Range 40 Degrees to 450 Degrees F Test Lever No Standards CRN CSA