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 standard No-Insect Bumper Cap This product ships in approximately 1 days