K-Pump 400 HP Hand PumpThe K Pump 400 HP Hand Pump does it all! The unique two stage design lets you fill the chambers of your raft or cataraft quickly, then switch to the high pressure mode to top off. Built to last, easy to use, a snap to stow. The primary stage delivers a huge volume (approx. 1. 6 gals) of air per stroke. When the pressure in the chamber increases and pumping starts to become difficult, a simple twist of the handle locks out the high volume primary stage