PRESSURE GAUGE * diameter: 1-1/2", 2", 2-1/2", 3", 4", 5" * window: polycarbonate * internal: brass, stainless steel Pressure Gauge * diameter: 1-1/2", 2", 2-1/2", 3", 4", 5", 6"* window: polycarbonate* internal: brass, stainless steel* rang: 0-10000psi* Inlet thread: 1/8", 1/4", 3/8", 1/2", NPT ,BSPT, BSP* connection: bottom connection