Aurora 220 Series Boiler Feed & Condensate units provide for an automatic return of hot water condensation from radiators, coils, pipe, etc., to high- or low-pressure boilers. They are also used in industrial complexes for returning liquids to overhead storage tanks of gravitational circulating systems as well as many other unique uses. In a duplex system, single pump operation provides service when capacity and demand calls for normal service. The two Model 323 pumps used in the system operate alternately to extend the life of both pumps. Both pumps operate simultaneously when service demands exceed the capabilities of a single pump. Walls are 3/16" to ensure long life. Threaded inlet, vent, drain and gauge glass connections are provided. Included are mounting holes for bolting to floor or base.