Bayonet end of sewer hose locks onto the cap, pulling out the sewer hose when you remove it and preventing hose from sliding around in the bumper. Fits on the end of most metal 4-inch square bumpers, lugs compatible with any Camco bayonet-style sewer hose fitting High-strength Neodymium magnets keep the bumper cap in place Features small holes for airflow and doubles as an insect screen Includes additional No-Insect Bumper Cap Grip handle for easy installation and removal Fits standard 4" square RV bumper