FRS 660-11-DPU-UL is the newest addition to this company's line of die- sel fuel purifiers and fuel recirculating sys- terns (FRS). The Duplex Pump Unit (DPU) is designed to automatically cir- culate and clean the fuel in customer's fuel storage tanks on a preprogrammed schedule. The DPU features two fuel pumps, which operate alternately to circulate the fuel through the system. The firm's other FRS units utilize a single pump.
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