Impeller/Waterpump Cover - BlackCaracteristicas: An aluminum investment cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system This 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 Patented nautilus style impeller for hydrodynamic efficiency Extend engine life Peso: 0. 4 Alto: 2.