Hello, Can you tell me how the wires feed into the box? Do those grey grommets come out? Is there a weather tight seal that goes around the wire? Is the feed through grommet an extra cost? Thank you
You pierce a small hole in the grommet being used and the cable is pushed through and down into the van. The tight rubber seals around the cable. You can of course also seal this further with sikaflex but this is optional.