Product Details: The SKF Single Row Cylindrical Roller Bearing Hub Cap is designed to provide superior performance and reliability. It features an embedded aluminum ring that evenly distributes load, a molded pressure ridge that improves sealing ability, and a proven center-fill vented plug-in design. The side fill plug incorporates an O-ring for extra leak protection and a magnet that traps metallic particles. The patented umbrella style valve seals keep out contaminants, ensuring a long-lasting and reliable performance. FleetPride is your First Click in Heavy Duty®.