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post #3 of Old 03-03-2010
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I agree, bonding the through hulls is not necessary. Are you replacing them because they are not opening and closing properly? Because they are gate valves? Or just because they are old? If they are real seacocks they are built for the long run and can be reconditioned if necessary. If they are gate valves I would replace without question. If you do replace them the proper way is with a through bolted base as opposed to the mushroom with a nut only method. See this link by Maine sail for the options available, method and proper backing plates (fiberglass and not wood). Replacing Thru-Hulls and Seacocks Photo Gallery by Compass Marine at

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