Yamaha - Outer plate,cart. - 6E5-44323-00-00Yamaha Outer Plate Cartridge Water Pump Housing Component 6E5 44323 00 00 Overview When youre rebuilding a water pump, the outer plate is one of those parts that can quietly make or break the job. Ive seen pumps with a fresh impeller still underperform because this plate was worn or grooved. It helps seal and guide the water flow inside the housing, so it needs to be flat and clean. Replace it when needed, and youll get the cooling performance youre