The SKF 6-Bolt Oil Fill Hub Cap is designed to provide superior sealing and protection for your vehicle. The embedded aluminum ring evenly distributes load, while the molded pressure ridge improves sealing ability. The proven center-fill vented plug-in design ensures a secure fit, while the side fill plug incorporates an O-ring for extra leak protection and a magnet which traps metallic particles. The patented umbrella style valve seals keep out contaminants, making this hub cap ideal for Ford, Mack, and Freightliner applications. FleetPride is your First Click in Heavy Duty®.