This 1/8 inch lead free center back entry pressure gauge is used in commercial, residential, and institutional HVAC applications. It features a black enamel steel case, Kostil polymer window, 1/8 inch NPT connection, bimetal spiral spring, copper alloy Bourdon tube pressure element with ASME Type B accuracy. This gauge features a 1 1/2 inch dial with pressure rating scale from 0 to 60 psi.