airheads 12 volt hi pressure air pump w/ pressure release valve produces 3 times the pressure of other 12 volt air pumps. Therefore it does a great job getting towables, boats and rafts nice and firm for peak performance. Five universal valve fittings fit all popular valves and lock onto the hose. A removable pressure release valve limits the output to 1.4 psi, the perfect inflation pressure for towables. The 21 hose is heavy duty and reinforced with pvc coils. This powerful pump draws too many amps to plug into a cigarette lighter style outlet. Hook it up to your car, truck or boat battery with the alligator clips connected to a 10 foot power cord. Volume is 410 liters/min. Maximum pressure is 2.5 psi. It draws 28 amps / 340 watts..