re: Help - Boat Corrosion at Drain Plug

quote:

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Seems to be a brass fixture with a brass plug so I am not understanding the dissimilar metal posts(?)

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But it's not. The sealing ring is one thing, the plug ring is another.

Drill out the rivets or screws. Replace them with quality components and seal with marine epoxy.

I suspect the screws or rivets may also be part of the problem in your case.