This hose connection gauge is used to test water supply pressures within a distribution system. Its red indicator hand holds at the highest reading registered for detection of thermal expansion pressure surges. It features a black enamel steel case, Kostil polymer window, 3/4 inch HT hose connection and copper alloy bourdon tube sensing element. Accuracy is ASME, Type B. Available in 0 to 300 psi (21 bar) pressure rating scale.