Use the Hobie Thru Hull Plug to replace or add a waterproof wiring port to any kayak. Useful for mounting fish finders, GPS units or other electronics to the outside of your kayak, this Thru Hull Plug allows for a clean and waterproof port for your wires to run into the hull of your kayak. Mounts with the included nut and o-ring. Does not include rubber grommets for routing wires (sold separately).