Sierra's 18-3088 Impeller is designed for use in Yamaha outboard engines. Use with Sierra's 18-3374 Water Pump Kit without Housing, 18-3397 Water Pump Kit without Housing, and 18-3398 Water Pump Kit with Housing. Includes one impeller per package. It is interchangeable with Mallory 9-45606 and Yamaha Outboard 6F5-44352-00-00. Each Sierra product meets or exceeds the original equipment part it replaces.