Perfect for “Topping Off” Towables 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.