Keep your Yamaha outboard running cool with this brand new replacement water pump impeller! This is a critical maintenance part for 4-stroke Yamaha motors in the 25, 30, 40, and 50 horsepower range. The part number is 6H4-44352-01 (replaces 6H4-44352-02-00 and is also a match for Sierra part 18-3068). It's made from durable neoprene rubber and comes new in its packaging. The impeller is the heart of the cooling system – it's the little pump that pulls water up from the lake or river to cool your engine. Over time, these wear out, get stiff, or lose their fins, leading to overheating and serious engine damage. Replacing it as part of regular maintenance (often annually) is cheap insurance. This one from YiheoZux includes a 1-year warranty. If your motor's temperature warning light is coming on, or you haven't changed the impeller in a few seasons, this is the part you need. Make sure your summer on the water isn't ruined by a preventable breakdown!