Check Valve In Line Inlet (In.) 1/4 in FPT Outlet (In.) 1/4 in M(NPT) Brass Max Pressure (PSI) 250 psi Cracking Pressure (PSI) 0.1 psi Hex Size (In.) 11/16 in Flow Range Free Air (CFM) 1 to 9 cfm Max Temp (F) 250 Degrees F Horizontal Vertical Mounting Length (In.) 1 9/16 in Stainless Steel Spring Material Stainless Steel Poppet Tank Check Valve for Small Compressors or as Components in Pneumatic Circuits