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Molar
The size valve I choose is slightly larger then the scupper hole inside the boat.
The next valve size is 1" and the scupper hole would have to be enlarged to more than 1.5".
If you enlarge the scupper hole too much, you will expose the inner foam which could allow water into the inner hull. BAD thing
The 3/4 valve fits well and is sufficient to remove water from the deck.
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