The Meritor 6.75" 6-Bolt Hole Grease Type Hub Cap is designed to provide superior performance and reliability. This hub cap is designed for use with TP/WP and HP axles and features a 6.75" bolt circle diameter and 6-Bolt holes. It is available in both aluminum and hi-impact poly, and includes a plug and gasket or O-ring. The poly screw-on caps also feature a vented plug and hub odometer-ready design, while the aluminum caps have hi-impact poly windows for easy inspection of lubricant level and condition. This product is approved for use with grease lubricant type axles and is perfect for trailer applications. FleetPride is your First Click in Heavy Duty®.