Description PRODUCT DETAIL:Automatic submersible cast iron sump/effluent pump Heavy-duty cast iron construction for rapid heat dissipation and extended life Clog-resistant design - capable of passing 1/2 inch diameter semi-solids Integrated snap-action float switch - reliable automatic operation for use in basins 11 inch in diameter or greater On: 8 inch - 11", off: 2 inch - 5", 3 year warranty. Not suitable for pond use