The "Cable Cap" is the professional way to seal holes that were drilled in most surfaces on your boat for installing electrical wiring for most accessories. The Cable Cap not only seals out water, it also prevents wear to the cable from the edges of the hole. This White Cable Cap is designed for a two cables that are up to 1/4 inch in diameter.
Needed to run a pair (each) of 10AWG wires through my T-Top for my 2 solar panels . Worked out great. Great price too. 5 Stars.