Fairchild Industrial Products P/N 4514AI, Model 4500A, 1:1 Ratio, Aluminum Body, Nitrile or Dacron Diaphragm, 1/2"NPT Female Connection, 150 SCFM with 100 PSIG Supply and 20 PSIG Output Flow Capacity, 250 PSIG Maximum Supply, with By-Pass Valve, Air Press