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Van,
If it is just a regular thru hull with no strainer etc on the outside........many thimes if you look in the fitting from the outboard side you'll see a couple tits inside the hole. You can usually find something, piece of flat bar or the square head of a breaker bar to grab the tits for someone to hold while your turning.
There are an infinite amount of good underwater sealants. 5200 one of the best and most popular. Get the fast setting one. The regular 5200 takes days to cure.
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