The Siphon Pool Cover Drain economically pumps the water off your cover without electricity. Squeeze operated pump begins the flow of water and it stops automatically when the cover is drained. The unit comes with drain, pump and siphon and 13 feet of hose. The Cover Drain works on all aboveground pools and inground pools with a 3 foot elevation drop within 20 feet of your pool's edge. Siphon Cover Drain includes 10 feet of hose.