This 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. 1.3 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 and locks in the high-pressure "top-off" stage. Nozzle end and included adapters fit most inflatable boat valves - Leafield, Halkey-Roberts, Summit, Boston, Military and AD-2. Ergonomic design is comfortable to use, even with extended use. Efficiently operated by one person. No hoses to kink and pull out. Easily stowed, takes up little space. Rugged construction is backed by an unlimited 2-year warranty. A spare O-ring for each of the stages is included with the pump. 5 lbs., 4" Dia. x 31" H An Oregon family of whitewater boaters and fishermen designs these quality hand pumps. Assembled in a workshop facility for the handicapped.