... ,vacuum pressure gauge,Vaccum and compund Gauge,automoible gaugeDiameter: 1-1/2", 2", 2-1/2", 3", 4", 6"Case: plastic, steel, stainless ... , polycarbonateInternal: brass, stainless steelInlet thread: 1/8", 1/4", 3/8", 1/2", NPT ,BSPT, BSPConnection: bottom connection, center back male connectionAccuracy: 2.5 ...