The bumper for the Loop & Management Boxes provides extra protection against the ingress of water into the ports when the boxes are used in battery mode, as well as providing some extra protection against bumps and scratches.
To ensure the optimal weather resistance it is important to slide the bumpers fully onto the box. The seal to hold water out is located at the very base of the bumper; it is important that this part is snugly fitted on to the Box.
We do not recommend mounting the boxes upright when using the bumper, as water may collect in the gap between bumper and case, thus increasing the likelihood of water leaking inside the bumper.