Refrigerating Pressure Gauge : (1)Diameter:1-1/2", 2", 2-1/2", 4" ( ... & cover: SS304, Steel (3)Accuracy: 3-2-3% Refrigerating Pressure Gauge(1)Diameter: 1-1/2", 2", 2-1/2", 4 ... : SS304, Steel(3)Window: polycarbonate(4)Internal: brass,(5)Inlet thread: 1/4", 3/8", 1/2", NPT ,BSPT, BSP(6 ... in, air-conditioning, refrigeratorCustomers brands and logos accepted. Refrigerating Pressure Gauge