Automatic Submersible Bilge Pump - Electromagnetic Switch 01604-00 Heavy-Duty, high-performance pump Exceeds the tough demands of commercial and recreational duty Liquid Cooled 12-Pole motor with double ball bearings Lip Seal design construction Prewired with automatic float switch(with Manual Over-ride Operation) Optional and removable check valve included 1-⅛" & 1-¼" hose adapters included 3 year warranty