Prepare your truck to be ready for all types of conditions with reliable brake drum performance, with the OTR 7" Marker Clearance Plug with Expertise Built In. By covering the passageway for a clearance light housing, this replacement device is able to prevent damage from water, oil, and various types of debris. Built with high-quality materials to endure extreme environments and rough conditions. FleetPride is your First Click in Heavy Duty.