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The Flojet Duplex 11 series of pumps incorporate the best technology and features developed by ITT Flojet. Everything from the back flow preventer, check valves, bearings and diaphragm assembly to the motor, have been designed to make this truly the most advanced and reliable diaphragm pump available. Higher efficiency of the pump is evident in the longer life of the motor pump unit. The new diaphragm design combined with the new valves, makes the pump capable of pulling higher dry vacuum. Flojet Duplex 11 is available in various performance ranges, voltages and a choice of elastomers, making it easily adaptable to a diverse range of applications. Self-priming up to 2.4m. Can run dry without damage. Chemically resitant materials. Internal bypass standard. Built-in back flow preventer. Heavy duty ball bearing drive system.