Aspirator Filter Pump, Richards, Die-Cast, White Metal Body With Integrally Cast Side Arm, Plated Brass Nozzle; Cast Aluminum Baffle Tube. 3/8 " (1/2 " Drain, 1/8 " Npt Vacuum) Water Inlet, 7 "(178mm) Length, Each

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Humboldt Aspirator Filter Pumps offer excellent performance for vacuum filtrations under both high and low water pressure conditions. The pumps feature a ball-type, positive-action valve in the suction tube which prevents water backflow if the pressure is reduced.