This lightweight plastic pump is designed to inflate/deflate inflatables with less effort due to its continuous stream of output on both the up and down strokes. This pump easily doubles as a handy bilge and can also deflate. Besides using to fill an item completely, we also recommend using this pump to top off your items after inflated with a 12v electric pump. It is also handy to keep on the boat for topping off your tubes while on the water.