Mid-West Instrument piston type differential pressure gauge. Simple rugged compact design. Over range protection to maximum pressure. Weather resistant gauge construction standard. Five year limited warranty. Low cost piston type differential pressure gauge for use in measuring or controlling the pressure drop cross filters, strainers, separators, valves and pumps. 316 Stainless steel body material. Stainless steel internal metal part. Buna-N seal material. 1/4-inches FNPT end connections, 4-1/2-inches uni-directional round dial, weather resistant engineered plastic case, accuracy +/-2 percent full scale (ascending). Ceramic moving components. One control switch in NEMA 7 (explosion proof enclosure) (2). No input power for reed outputs A, E, F, G and H. SPDT, 3W, 0.25 Amp, 125 VAC/VDC (switch adjustable 15-90 percent of full scale ascending). Shatter resistant acrylic lens.