The Sierra 18-7944 10 Micron Replacement Fuel Water Seperator is a high-quality boat part designed to filter out water and impurities from fuel, ensuring a smooth and efficient operation of the engine. With a manufacturer part number of 18-7944, this product is specifically crafted by Sierra to fit and function properly in various boat engines. The short length of 3.875" makes it easy to install and maintain, providing a reliable solution for keeping your engine running smoothly on the water.