Yamaha - Cartridge Outer Plate Cooling System Component 6L5-44323-00-00. Overview. When you're rebuilding a water pump, it's not just about the impeller-the surrounding parts matter just as much. I've seen plenty of pumps underperform because the plate was worn or uneven. This outer plate helps keep everything aligned and sealed so the pump can actually do its job. It's a small piece, but without it in good shape, you won't get proper water flow.. Key Features. Supports Pump Structure - Helps maintain proper alignment of internal water pump components.. Smooth Contact Surface - Provides a consistent surface for efficient impeller operation.. Corrosion-Resistant Build - Designed to withstand constant exposure to water and marine conditions.. Factory-Spec Fitment - Matches Yamaha cooling system components for proper installation.. Ideal for Pump Rebuilds - Commonly replaced during full water pump service.. Engine & Boat Compatibility. Designed for Yamaha outboard engines with compatible