Adjusts air pressure at the air tool Ideal for spray guns to avoid costly painting errors such as poor color match, runs, poor coverage, orange peel, etc. Accurate 0 to 160 psi Fits most makes and models of spray guns and air tools Air Inlet: 1/4" NPT(M) Air Outlet: 1/4" NPT(F) Shipping Weight: 0.5 lbs.