series iwtg-gas air test assembly gauges are used in commercial, residential, and institutional hvac applications. it consists of a 3/4 in. chrome plated brass manifold, steel case, kostil polymer window, 3/4 in. fip x schrader type air valve w/cap connection, and copper alloy bourdon tube pressure element. accuracy is asme, type b. gauge pressure reading 0- 30 psi.
