Impellers are critical to engine cooling, take a long a spare. MerCruiser sterndrive engines rely on the water pump for cooling. The impeller is the heart of the water pump; inspection and replacement is required on a regular basis to keep the engine running at optimum temperature. Mercury Marine impellers give boaters and technicians the confidence of using an OEM part. Each impeller is engineered to original MerCruiser specifications to provide a factory fit and restore function. Because impellers can be quickly damaged by running through silty or sandy water or by being run dry, we recommend having a spare aboard to be ready for unexpected failures. Mercury impellers are available in many sizes for different engine applications, reference your repair manual to confirm the proper part number for your inboard engine. Or call 1-800 BOATING with your serial number, or make, model and year of your engine and speak to an expert to find the right impeller. Key Features Engineered to original Mercury or MerCruiser specifications Quicksilver is an OEM part and will restore function to factory specifications Compatible with 2000 or newer V6 and V8 (305, 350, and 494 cu in) engines with Bravo drive and brass sea pump; Call 1-800 BOATING with your engines serial number to be certain this impeller is correct.