Boat owners with Mercury outboards in the 75, 90, 115, 125, or 150 horsepower range, listen up! The water pump impeller is the heart of your cooling system. It's a wear item that should be replaced every year or two to prevent overheating and serious engine damage. This is a brand new replacement impeller kit from PAL.

The key part numbers are 47-89984T4 and 47-89984 (also replaces 47-65960, 47-803631T, and others like Sierra 18-3017). It's a 6-blade impeller. The impeller itself is made from a durable compound (CR likely stands for Chloroprene Rubber), and the shaft sleeve is brass. The outer diameter is about 59.24mm, and the inner hub diameter is 22.16mm. The whole thing weighs 94 grams. It comes with a warranty.

This is not a domestic product, but it's a high-quality aftermarket part. A worn impeller won't pump enough water to cool your engine, especially at low speeds or idle. Replacing it as part of regular maintenance is cheap insurance. The job involves dropping the lower unit, so it's a bit of work, but any decent DIYer or mechanic can handle it. Make sure you get the whole water pump kit (gaskets, housing) if needed, but this is the core impeller. Keep your Merc running cool and reliable on the water all season long. Don't wait for the overheat alarm!