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I went the PVC way on the thru hull drains, I didn't want to replace them because of corrosion... One thing I learned when I worked on commercial fishing boats. When tied up at the dock, and there were steel boats around. where welding was taking place the zinc's world be gone in one season. Normally there would be some left when we haled, to survey the boat.

Please! Do Not take this wrong.. I am just stating the fact I have a lot of stuff in a little space.

I have two hydraulic lines , engine wiring, bilge pump, plus a large thru hull transducer, and a transom mounted transducer plus wires(two) with a plug inside. There is room for he plug on the inside of a Montauk ...