Product Description A diaphragm pump (also known as a Membrane pump) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm (check valve, butterfly valves, flap valves, or any other form of shut-off valves) to pump a fluid. The listing is about 35 GPM Air-Operated Double Diaphragm Pump with 1 Inch Inlet And Outlet. This powerful air-operated double diaphragm pump QBY4-25L features a 1in. inlet and 1in. outlet capable of pumping up to 35 gallons/min at temperatures up to 150 degrees F. Can not use for corrosive liquid. Specifications Product: Diaphragm pump Type: Double diaphragm Operation Type: Air-operated Model: QBY4-25L Body Material: Aluminum Inlet Port: 1 inch (25 mm) Outlet Port: 1 inch (25 mm) Air Inlet Size: NPT 1/2 inch (12.7 mm) Average Air Consumption: 38 CFM Max Flow Rate: 9 m3/h (35 GPM) Suction: 0-5 m (0-16.4 ft) Max Suspended Solids: 3 mm (1/8 inch) Max Head: 84 m (275.59 ft) Max PSI: 120 psi Max Temp.: 150 ℉ Self-Priming Dry: 3 m (10 ft) Self-Priming Wet: 4.6 m (15 ft) Manifold Connection: Single Valve Type: Ball Ball Material: Acetal Check Seat Material: Polypropylene Diaphragm Material: Nitrile Package Size: 35 x 26 x 23 cm (13.78 x 10.24 x 9.06 inch) Gross Weight: 9.86 kg (21.74 lbs) Package Content 1 x Air-Operated Double Diaphragm Pump 1 x Product Manual