This H.O. Sports® 12-volt, high-capacity air pump lets you quickly and easily inflate and deflate your inflatables. It's designed to be compact, yet powerful enough to inflate all your tubes to the correct pressure. It comes with attachments for Boston and stem valves, battery clamps. This inflator pumps out a massive 2.5 PSI and will fill even the largest tubes. This is a must have on any boat.