COMPOUND AND VACUUM PRESSURE GAUGE Diameter: 2", 21/2", 3", 4", 5", 6" Case: plastic, steel, stainless steel Window: plastic, polycarbonate Internal: brass, stainless steel Connection: bottom connection, center back male connection Accuracy: 2.5%-1% Scale: psi, bar, Mpa, Kpa, kg/cm2, Hg single or dual scale or according to customers order. Inlet thread: 1/8", 1/4", 1/2", 3/8", NPT, BSPT, BSP