Outfit your semi to be Ready for the Road Ahead™ with superior engine protection to keep it at its best, with the Donaldson Round Primary Air Filter . This replacement air filter system traps dust, dirt, and other contaminants before they enter motor, leading to cleaner air and enhanced vehicle performance. Engineered with durable materials and efficient technology to extend service intervals and reduce how often each filter should be changed. FleetPride is your First Click in Heavy Duty®.