If you're looking for a water pump impeller kit for your Mercury Mariner 40-50 HP outboard motor, I've got just the thing for you. This kit includes all the necessary components to replace the water pump impeller, ensuring proper water circulation and cooling for your motor. It's a great way to keep your Mercury Mariner running smoothly on the water. So go ahead and grab the Water Pump Impeller Kit for Mercury Mariner 40-50 HP and enjoy worry-free boating!