• Simply turn the release valve counter-clockwise and you're pumping air only on the down-stroke; a great option when inflatable is almost full and there is back pressure
• Accordion-style hose stretches to five ft. long and interlocks to the pump so it doesn't fall off while you're pumping
• Very effective for "topping off" large towables in the boat, since peak pressure is an impressive 14 psi
• This double-action pump inflates and deflates towables, kayaks, boats, airbeds and other inflatables
• Delivers a continuous stream of air on both the up and the down strokes
• Four universal valves are included to fit Boston valves and stem valves
• Volume is two liters/stroke