Yamaha - Outer Plate, Cartridge Water Pump Component 6CB-44323-00-00. Overview. If you've ever pulled apart a water pump and seen grooves worn into the plate, you already know how important this piece is. The outer plate sits right under the impeller, and it takes constant contact every time the motor's running. Once it's worn, you lose efficiency even if the impeller is new. Swapping it out during service keeps water flow strong and your cooling system doing its job right.. Key Features. • Smooth Impeller Surface - Provides a clean contact surface for proper impeller rotation.. • Maintains Pump Efficiency - Helps ensure strong and consistent water flow through the system.. • OEM Fit Accuracy - Matches Yamaha factory specs for correct thickness and alignment.. • Corrosion Resistant Build - Designed to handle constant water exposure and harsh marine use.. Engine & Boat Compatibility. Verify compatibility with your specific Yamaha outboard model and part number before installation.. FAQs