Outfit your semi truck to be Ready for the Road Ahead™ with protected hub caps, with the Stemco 0.75" Rubber Vented Hub Cap Plug - Red. To seal out contaminants such as dirt, water, and oil before they can enter the wheel assembly, this rubber plug is crafted with a straightforward design. Built with an additional sealant to increase overall reliability. FleetPride is your First Click in Heavy Duty®.