This double action air pump inflates and deflates towables, kayaks, boats, airbeds, and other inflatables. It delivers a continuous stream of air on both the up and down strokes. Simply turn the release valve counter-clockwise and you're pumping air only on the down-stroke. This is a great option when your inflatable is almost full and there's back pressure. Four universal valve fittings are included to fit Boston valves and stem valves. The accordion-style hose stretches to 5 ft. long and interlocks to the pump, so that it doesn't fall off while you're pumping. Volume is 2 liters / stroke. Very effective for "topping off" large towables in the boat, since peak pressure is an impressive 14 psi. Airhead Double Action Hand Pump Inflates or Deflates Tubes, Airbeds, Boats, and Toys, etc. Continuous Stream in Up or Down Stroke Release Valve for Pumping Down Stroke Only Capacity 68 Gallons (257 liters)/60 Stroke Great for Topping-Off Inflatable Products Pressure 14 psi (0.97 bars) Four Universal Valve Fittings Stretchy 5' (1.5 meters) Hose Item Dimensions: 18.75 L x 8.56 W x 4.5 H Unit of Measure: EA This product ships in approximately 1 days