An aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system High-flow, hydrodynamic water pump kit has been tested and designed to flow more coolant By increasing the flow at all rpm ranges, the engine will run cooler at a more constant temperature Nautilus-style impeller for hydrodynamic efficiency Extends engine life Made in the USA - Yamaha YZ 450 F (2024, 2025, 2023); Yamaha WR 450 F (2025, 2024); Yamaha YZ 450 FX (2025, 2024)