Air Relief Valve Soft Seat (M)NPT Inlet (In.) 1/4 in Preset Setting (PSI) 125 psi - Rated CFM @ Set Pressure Max Temp (F) 250 Degrees F Brass Body Material Rubber Seal Brass Poppet Stainless Steel Spring Vibra Seal Thread Coating Includes 4 Color Coded Springs - Yellow 25 to 50 psi Red 51 to 100 psi Silver 101 to 150 psi Blue 151 to 200 psi