Rule submersible pumps are the first choice for many hovercraft builders. Their motors feature stainless-steel shafts, water cooling and a vibration-free centrifugal impeller that won burn out if run dry. Strainer bases can easily be snapped off for cleaning. Each pump requires a panel switch for manual operation. Pumps are 12V. These pumps are used in most wood constructed or fiberglass manufactured hovercraft.