Calibrated Adjustable Relief Valve Body Material Lead-Free Brass Inlet Type MNPT Outlet Type FNPT Inlet Size 3/4 in Outlet Size 1/2 in Pressure Range 50 to 175 psi Disc Material Buna-N Overall Height 3 in Application Fire Protection Systems Overall Length 1 5/8 in Seat Material Buna-N Spring Material Stainless Steel Temp Range 0 Degrees to 180 Degrees F Test Lever No Standards FDA NSF