Prepare your semi to be Ready for the Road Ahead™, with the Donaldson Primary Round Air Filter that ensures phenomenal engine protection to keep your system running at its best. To provide enhanced vehicle performance, this replacement air filter system cleans the air of dirt, dust, and other contaminants before they can enter the motor. Constructed with innovative materials and modern technology to extend service intervals and reduce how often each filter should be changed. FleetPride is your First Click in Heavy Duty®.