The Hobie Thru Hull Wiring Kit allows you to thread wires through the hull of your boat to install fishfinders, GPS and more. The kit includes two through hull fittings with a variety of options for different wire sizes, backing nuts, o-rings, and installation instructions. Also includes two solid grommets to block off the opening if you want to remove your electronic device.
It works well for several different diameter wires including an option for no wires. The seal is not completely water tight, but does well to cover a large hole needed for electronic cables to pass through. It does make the finished job look professional.
The best invention I've found for thru hull wiring. I have this kit installed in 3 different kayaks and it works flawlessly. Don't let the large hole the you have to drill scare you off.