The Donaldson 5.51" Spin-on Fuel Filter and Water Separator is designed to remove dirt, rust and other contaminants from fuel and water, helping to keep your engine running smoothly and efficiently. The filter is constructed from durable materials and features a spin-on design for easy installation and maintenance. With this filter, you can count on reliable filtration performance and long-lasting protection for your engine. FleetPride is your First Click in Heavy Duty®.