This 1/2 inch lead free bottom entry pressure temperature gauge is used in commercial, residential, and institutional HVAC applications. It features a black enamel steel case, Kostil polymer window, 1/2 inch NPT connection, bimetal spiral spring, and copper alloy Bourdon tube pressure element with ASME Type B accuracy. This gauge features a 3 inch dial with pressure rating scale from 0 to 50 psi and temperature range 32 to 248 degrees F.