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Old 08-10-2008
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Maine Sail Maine Sail is offline
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Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
It seals because...

It seals because the head of a thru-hull fitting is concave or has a groove to capture sealant and also sealant is applied under the flange between it and the backing plate.

Sealant gets trapped in the concave part:

Sealant gets applied here too and trapped in the bevel near the threads:

Like This:



If this guy working on your boat is asking questions like this perhaps he should not be working on your boat? Especially if he feels NPS & NPT are a safe match because he got "five" threads... Really makes you wonder why we pay so much for these "experts" to work on our five, six and seven figure toys...
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