Use your foot to inflate or deflate towables boats and other inflatables with AIRHEAD&';s HI-Volume Bellows Action Foot Pump. This durable air pump has a 54" long hose and 3 adapters to fit many valves including Boston and stem. The air displacement per stroke is 0.5 liters. Since the pump achieves a maximum air pressure of 2.9 PSI you can get your inflatable boats and towables nice and firm. It conveniently collapses to fit under kayak decks or boat seats so it&';s a good choice for "topping off" large towables in your boat.