Chapman Swirling-type 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 that prevents water backflow if the pressure is reduced. Plated; designed for greater air entrainment capacity. Water inlet is 3/8" NPT; length is 5-3/8" (137mm). Shipping Weight 4 lbs. (1.8 kg).