Safety Relief Valve Body Material Bronze Inlet Type MNPT Outlet Type FNPT Inlet Size 1/2 in Outlet Size 3/4 in Factory Set Pressure 250 psi Disc Material Bronze Overall Height 6 1/2 in Application Air Gas Overall Length 1 5/8 in Seat Material Metal Spring Material ASTM A-313 TY 631 Temp Range -60 Degrees to 406 Degrees F Test Lever Yes Compliance Section VIII Air/Gas