D4484 Safety Relief Valve Body Material Bronze Inlet Type MNPT Outlet Type FNPT Inlet Size 3/4 in Outlet Size 1 in Factory Set Pressure 25 psi Disc Material B21 Alloy 485 Overall Height 7 1/2 in Application Air and Gas Compressors Pressure Reducing Stations etc Overall Length 3 1/2 in Seat Material Viton Spring Material Stainless Steel Temp Range -60 Degrees to 406 Degrees F Test Lever Yes Standards Air/Gas UV ASME Section V111 ASTM A-313 TY 631 National Board Certified