Review: The GLM Water Pump Impeller Kit for Mercury 4, 4.5, 6, 7.5, and 9.8 hp is a great product that can help you keep your outboard motor running smoothly. This kit includes everything you need to replace the impeller in your water pump, including the new impeller, shaft, and gasket. One of the things I like about this kit is that it comes with detailed instructions on how to install the new impeller. These instructions are easy to follow and will help ensure that you get the job done right the first time. Additionally, the kit includes a .456" inside diameter impeller that replaces 47-89981, 18-3239, which means it should fit most Mercury outboard motors. Another great feature of this kit is that it comes with a shaft that has a larger diameter than the original one. This will help to prevent leaks and ensure that your water pump continues to function properly. The gasket included in the kit is also made from high-quality materials, which means it should last for many years. Overall, I would highly recommend this GLM Water Pump Impeller Kit for anyone who needs to replace their impeller on a Mercury outboard motor. It's easy to install and includes everything you need to get the job done right.