Double action pump inflates, and deflates towables, kayaks, boats, irbeds, and other inflatables. Delivers a continuous stream of air on both the up, and down strokes. Simply turn the release valve counter clockwise and you are now only pumping air on the down stroke, a great option when the inflatable is almost full, and there is back pressure. Four universal valves included to fit Boston, and stem valves. Accordion style hose is 5ft long and interlocks to pump. Volume is two liters per stroke. Peak pressure 14psi.