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I recommend "factory original". I am not a "fiberglass man" or "epoxy pro". I believe if there was a 100% alternative method instead of the brass drain tubes it would have been welcomed on the web site with open arms. There are many posts as well as an installation article for drain tube installation. A proven method. My hull is a 1979 22' Revenge and the only tube I removed to date is one in the transom 12" below the water line. Still solid and functioning. I removed it to eliminate it.

I am installing a brass tube inside the hull. The only solid backing inside the hull is the gel coat (approximately 3/16 thick). Then foam. Then the other side of the gel coat. I would not trust a thin veneer of fiberglass with no backing. The boat flexes.

Garris