Yamaha - Outer Plate Cartridge Water Pump Housing Component 6E5-44323-00-00. Overview. When you're rebuilding a water pump, the outer plate is one of those parts that can quietly make or break the job. I've 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 you'll get the cooling performance you're expecting.. Key Features. • Water Pump Housing Support - Helps maintain proper structure and alignment inside the pump assembly.• Smooth Sealing Surface - Provides a clean contact surface for efficient water flow and sealing.• Wear-Resistant Construction - Built to handle friction from impeller operation over time.• Consistent Cooling Performance - Supports steady and reliable water circulation.• Exact Yamaha Fitment - Matches factory specifications for proper installation and function.. Engine & Boat Compatibility. Designed for Yam