When you have water to move, you need reliable power to move it. Yamaha water pumps are rugged, reliable and have the muscle to get the job done. They deliver high-volume/low-pressure for rapid water transfer or de-watering. They also work great in various fire-fighting applications. And both pumps have a cast iron impeller and volute case � that means these pumps withstand wear from grit, sand, silt, etc. (but they are not designed for solids or highly viscous materials). The YP20G is powered by a 4 hp, 123cc, OHV 4-stroke engine that's quieter, more powerful and consumes less fuel than comparable engines.