Camcos Magnetic Bumper Cap for 4-in-1 Adapter allows you to store your 4-in-1 adapter onto your RVs bumper. The base stays securely in place on your bumper using high-strength neodymium magnets, allowing you to transport your 4-in-1 adapter externally, so it can be stored in your bumper and out of your storage bays. While in storage, the vented cap provides your 4-in-1 adapter with air flow, helping reduce the build-up of moisture and mold. Once off your bumper, the vented cap can be used to position your 4-in-1 adapter at the dump station without having to handle the adapter. The Magnetic Bumper Cap is made of durable polypropylene.