Fully conceal a sewer hose sewage line that is stored in the RV rear bumper with the Dumble RV Supplies Camper Sewer Bumper Cap 2-Pack. They are made of semi-flexible thermoplastic for rust and corrosion resistance and comes in a black color to match your existing bumper. The 1-inch square vent hole in the center of these motorhome bumper end cap plugs allows for air circulation to properly ventilate the storage bumper compartment. To install, simply pop the RV bumper end plugs onto your existing bumper sides to fully conceal the sewage hose. These RV end cap cover plugs are a standard size that fits typical 4-inch square RV bumpers. Ensure that the overall size of the RV sewer bumper cap is correct by measuring your bumper. Includes (2) camper end caps to suit your needs. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.