Aqua-King Freshwater Pump. The Next Generation SHURflo Aqua King guarantees quiet and smooth performance while providing the ultimate in durability and reliability. Designed and built specifically for the harsh marine environment the Aqua King is equipped with a sealed switch and e-coated motor. Our new design can operate at 55 PSI, which virtually eliminates cycling. Fittings Included. Ignition Protected. Thermally Protected.