Yamaha - Impeller Duct Jet Pump Flow Component 6FU-51315-00-00. Overview. The Yamaha Impeller Duct 6FU-51315-00-00 is one of those parts that keeps water moving the way it should through the jet system. It helps direct flow around the impeller, making sure everything stays efficient and balanced. When this duct gets worn or damaged, you can lose performance or notice rough operation in the pump. If you're servicing the jet unit, this is one of those parts worth checking closely.. Key Features. • Water Flow Channeling - Guides water through the impeller housing for efficient jet propulsion.. • OEM Fit Precision - Built to Yamaha specifications for proper alignment and secure installation.. • Supports Pump Efficiency - Helps maintain smooth water flow and consistent thrust.. • Durable Marine Construction - Designed to handle constant water pressure and debris exposure.. Engine & Boat Compatibility. Verify compatibility with your specific Yamaha jet drive or outboard model and part number