This air test assembly gauge is used in commercial, residential and institutional HVAC applications. It consists of a 3/4 inch FPT chrome plated brass manifold with shutoff valve, steel case, Kostil polymer window, 3/4 inch FPT x Schrader type air valve with cap connection and copper alloy bourdon tube pressure element. Accuracy is ASME, Type B. Pressure rating scale is 0 to 100 psi.