Description Fleetguard AF4196 is an axial seal primary engine air filter cartridge for air intake systems, acting as the outer/main filter element to prevent airborne contaminants entering the combustion chamber while maintaining a reliable seal. Typical dimensions are approximately 345 mm height, 134 mm maximum outer diameter, and 82 mm maximum inner diameter. This cartridge cross references Caterpillar 4058797 and Donaldson P901841 and is suitable for applications specifying these part numbers or the Fleetguard AF4196 reference.