Fairchild Industrial Products P/N 20832U, Model 20, 1:3 Ratio, Aluminum Body, Nitrile or Dacron Diaphragm, 1/4"BSPT Female Connection, 45 SCFM with 100 PSIG Supply and 20 PSIG Output Flow Capacity, 250 PSIG Maximum Supply, Air Pressure Volume Booster