The Mercury-Mercruiser 47-855708T40 Stainless Steel Outboard Jet Impeller is a high-quality component designed specifically for Mercury outboard engines. Made of durable stainless steel, this impeller enhances the performance of the engine by efficiently transferring water and reducing friction. With the manufacturer part number 47-855708T40, this impeller is a reliable and essential part for maintaining and improving the performance of your boat's engine.