Get your semi Ready for the Road Ahead with optimal hydraulic fluid performance, with the Donaldson Duramax Spin-On Hydraulic Filter. Thanks to its ultra-fine filter, this replacement component is able to capture hydraulic contaminants before they cause potential pressure leaks or corrosion from occurring. Fashioned with a durable body to extend the service life and reduce the frequency of filter changes in semis or tractors. FleetPride is your First Click in Heavy Duty .