Air Safety Valve, Hard Seat, (M)NPT Inlet (In.) 1/2 in, Preset Setting (PSI) 225 psi, 459 cfm Rated CFM @ Set Pressure, Max. Temp. (F) 400 Degrees F, Brass Body Material, Stainless Steel Seal, Stainless Steel Ball, Stainless Steel Spring, Brass Seat, Vibra Seal Thread Coating, Standards ASME, CRN, NATIONAL BOARD, Compressed Air Safety Relief, High Temp