Graco AODD PumpGraco’s Husky 3300, a 3-inch (76.2-mm) air-operated double-diaphragm pump family features a modular, stall-resistant air valve design, which can achieve flowrates up to 300 GPM (1,135 lpm). The pumps also utilize a pilot valve for faster changeover, maximizing efficiency and reducing pulsation. The Husky 3300 pumps are available in three materials of construction, including aluminum, polypropylene and stainless steel. In addition, there are ball, seat and diaphragm material configurations to handle a range of abrasive and corrosive applications. The pumps also have a four-bolt joint design, which provides even sealing pressure for leak-free operation and a three-piece manifold for increased installation flexibility. The new polypropylene version has a fluid section containing an overmolded frame that decreases joint relaxation and increases strength to virtually eliminate fluid leakage.