Cold Start Valve Air Inlet (In.) 1/4 in Brass Hold Back Pressure (PSI) 25 psi Max Pressure (PSI) 250 psi Hex Size (In.) 9/16 in Flow Range Free Air (CFM) 0 to 2 cfm Max Temp (F) 250 Degrees F In Tank Mounting Length (In.) 3/4 in Stainless Steel Spring Material Brass Poppet Fluorocarbon Seal Air Relief