Features: 1Part Number: Replacing OEM numbers for reference are 369 65021 1, Replacement for Tohatsu 47 16154 3, replacement for Sierra 18 3098. 2Function: Neoprene impellers are used for marine water pumping, such as engine cooling, water transfer, wash down and bilge water pumping, suitable for fresh or sea water. 3Impeller Size: The hydromotor impeller has 6 blades. Height is 14.30mm or 0.56in, external impeller overall diameter is 33.58mm or 1.32in, inner shaft insert diameter is 10.25mm or 0.4in. 4High Performance: The flexible 6 blade impeller goes through a rigorous quality process to ensure reliable, efficient and long lasting performance. 5Recommendation: You should replace the flexible pump impeller at least once a year, or earlier depending on the engine duty. Be sure to bring a spare impeller with you before rowing. 6Premium Material: Made of the highest quality nylon and neoprene, the impeller makes service and maintenance of the water pump easy. Package included: 1 x WaterPumpImpeller