Product Features Cast Iron, two vane semi-iron, non-clog impeller with pump-out vanes for mechanical seal protection. Heavy Duty cast iron, volute type casing for maximum efficiency. 2.5″ Solids Handling Capabilities. Designed for Continuous Operation. Residential Wastewater Submersible Sewage Pumps WS D3 Series 3888D3. Applications include Sewage Systems; Flood and Pollution Control; Dewatering Effluent; Farms; Hospitals; Trailer Courts; Motels.