The Double Action Air Pump is perfect for topping off towables and other inflatables for the perfect fill. This is the perfect tube pump for boats because it delivers a continuous stream of air on both the up and down strokes for more efficient filling. The pump quickly inflates and deflates tubes airbeds boats toys and other inflatables with ease. Four universal valve fittings are included in the Double Action Pump which features a five foot accordion-style hose. This hose interlocks to the pump so that it doesn t fall off while you re pumping. The capacity of this inflatable tube air pump is approximately 68 gallons / 60 strokes and it has a peak pressure of 14 psi.