Yamaha - Outer Plate Cartridge Water Pump Housing Component 6H3-44323-00-00. Overview. When you're servicing a water pump, it's not just about swapping the impeller and calling it done. I've seen pumps lose efficiency because the internal plates were worn or grooved, and that's where problems start. This outer plate helps keep everything sealed and moving water the way it should. It's one of those parts you handle while you're already in there, so you know the job's done right.. Key Features. Water Pump Housing Support - Forms part of the pump assembly to guide and direct water flow.. Smooth Contact Surface - Helps maintain proper impeller operation and efficient water movement.. OEM-Spec Fitment - Built to Yamaha dimensions for correct placement within the pump housing.. Wear-Resistant Design - Designed to handle continuous contact and reduce internal scoring.. Cooling System Efficiency - Supports steady water circulation to help prevent overheating.. Engine & Boat Compatibility. Desi