This will close the plugs in the trunk of your G8X if you are running a valve controller. This prevents bugs, debris, etc from entering your battery compartment/trunk. Its split in half so that you can feed the wires through without removing them from the controller module. Some double sided 3M tape on the backside of the lip or some glue will affix it. It is a TIGHT fit to get them in so that they dont rattle and effectively seal. You have to put on part in, then angle the other upward, slide in and press.