I actually have a 4" going down where the old rigging went and a 3" in the other side. My old boat was stuffed to the hilt so I wanted room for expansion! If I go down the port side, I have to go across the bilge into the other side so that would be a long run. I was thinking of rigging a small tube from the console into the bilge and into the corner box by glassing it to the under deck, I'm probably over thinking things, lol. From what I'm reading interference isn't much of an issue with DC unless there is a motor of some type running so maybe I'll just use the 4" and then run the fishfinder transducer cable down the other side to keep my sanity. That's the main thing I would worry about anyway. That PVC drain pipe is really nice and light by the way for anyone that is doing this.
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