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Old 08-10-2008
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You are right the NPS on the thru hull piece and the base of the flange does not seal like a tapered thread. There for you have to use 5200 sealent on teh thru hull between the mushroom and the hull of the boat. This seals water out of the boat. The thru hull needs to be NPS because you have to cut it to length because the thickness of the hull .
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