Master Mechanic, 3/8" FNPT Airline Regulator With Gauge, Maximum Pressure 150 PSI, Regulating Range 8 PSI To 120 PSI, 34 SCFM Maximum Flow At 90 PSI Inlet & 5 PSI Pressure Drop, Gauge Can Be Mounted On Either Side Of Regulator, Includes 3/8" FNPT Inlet/Outlet.