I mounted the Raymarine junction box on the side of the mast with wires inside the mast terminating there. The wires from the cabin come up through a water tight fitting. It takes about 2 minutes to pull the cover and connect the color coded wires to the terminal block and reinstall the cover. I thought about some sort of plug but they always corrode and the signal is in the millivolt range. Leave enough wire, in mast and cabin, to clip the ends if they corrode.