Sierra's 18-3042 Impeller is designed for use in Yamaha outboard engines. Use with Sierra's 18-3451 Water Pump Kit and 18-3409 Water Pump Kit with Housing. Includes one impeller per package. It is interchangeable with Mallory 9-45612 and Yamaha Outboard 67F-44352-00-00. Each Sierra product meets or exceeds the original equipment part it replaces.