Milliard Swimming Pool Cover Siphon - Water Removal Drain for Above Ground Winter Pool Coverings Pool cover siphon uses no electricity. Just prime it with the included hand pump and let it drain! Great way to open up covered above-ground pools. Drainage point is grated to prevent clogs and weighted to constantly draw in water. Siphon includes a grated drainage point, 15 ft. spout hose and hand pump/primer. Made from durable ABS plastic and polyurethane to last from season to season.