Get your semi Ready for the Road Ahead™ with tremendous engine protection to keep it at its best, with the Donaldson Round Primary Air Filter. By utilizing a specialized collection system, this replacement air filter is the ideal choice to optimize vehicle performance by cleaning the air of dirt, dust, and other contaminants. Built with resilient materials and innovative technology to extend service intervals and reduce how often each filter should be changed. FleetPride is your First Click in Heavy Duty®.