The Flojet N5100-040 is a Flojet N5100 Series Air Operated Duplex Diaphragm Pump, CE listed, with Acetal housing, Santoprene Diaphragm, Santoprene Check Valve, with 3/8 inch Hose barb liquid ports, 1/4 inch hose barb air/gas ports, driven by a built in Air Motor. This pump is an Air-operated positive displacement double diaphragm pump that is designed for light general commercial and industrial applications, and is constructed from a selection of materials for handling a broad range of chemicals. This air-operated diaphragm pump offers excellent self-priming capability, and can be located above the liquid level or the supply tank. A suction-side foot valve is recommended for best operation. It has a variable capacity from zero to the maximum flow, and liquid pressure is regulated by supply air pressure. No bypass or pressure relief plumbing is necessary. It has a compact design with plug-in quick disconnect liquid and gas port fittings for easy installation. It has a maximum flow rate of 2.5 GPM (9.5 LPM), and operating pressure range of pressure 2075 psi (1.45.5 bar), and is Self-priming to 28 feet (8.5m) from dry, or 32 feer (9.8m) when wet. The Liquid ports are 3/8 inch (10mm), and the Air port is 1/4 inch (6mm). The air supply must be oil-free and dry. For a pump performance of 40 psi at 1 GPM it requires 0.5 CFM air supply, for 60 psi at 1 GPM it requires 0.6 CFM, and for 80 psi at 1 GPM it requires 0.8 CFM. If used with C02 or N2 be sure the area is well ventilated. NOTE : DO NOT PUMP GASOLINE OR FLAMMABLE LIQUIDS OR USE WHERE FLAMMABLE VAPORS ARE PRESENT. CAUTION: DO NOT EXCEED 80 PSI (5.6 bar) GAS INLET PRESSURE. CONTINUOUS OPERATION AT 120 degrees F (48.9 degrees C) WILL REDUCE PUMP LIFE.