The JS SK pumps are a range of submersible sewage cutter pumps.Their tungsten carbide tipped impeller runs against a grinding diffuser plate, shredding and cutting soft solids into smaller parts to pump through the body to waste. The pump features a cast iron pump body, volute stand, impeller, lower motor bearing/seal housing and motor top cover, while the motor case and shaft are from stainless steel. Their twin mechanical seals help prevent abrasives such as sand, dirt and silt from entering the seal chamber