Get your semi Ready for the Road Ahead™ with tremendous engine protection to keep it at its best, with the Donaldson Primary RadialSeal™ Air Filter. 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®.