Mid-West Instrument piston type differential pressure gauge. Simple, rugged, compact design. Over range protection to maximum pressure. Weather resistant construction standard. Shatter resistant acrylic lens. A low cost differential pressure gauge for use in measuring the pressure drop across filters, strainers, separators, valves, pumps, chillers and for local flow indication and control. Five year limited warranty. Two times rated working pressure at ambient temperature. Aluminum body material. Stainless steel internal metal part. Buna-N seal material. 1/4-inches FNPT back connections, 2-1/2-inches uni-directional round dial, weather resistant engineered plastic case, accuracy +/-2 percent full scale (ascending).