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I'm curious if anyone has knowledge on how the bow lift ring is built into Montauk's ?

I have a 1987 Custom 17 [former SS] and when I recently stripped and refinished the deck liner, I decided to leave the lift ring in place and worked around it.
I used the bow lift ring [and the two on the transom] to do a 3 pt lift and hull invert when I epoxy coated the bottom. It's definitely a hi-strength 'thru-hull', but I would like to know how water tight it is and can't really assess that w/out removing ring assembly.
My presumption is that it's a continuous tube structure of the same schedule f/glass laminate as the deck and hull.

Also, is there any reason to be concerned about water ingress to the foam interior from the laminate of the tube [if it is a tube]?
I expect washdown/rain from the deck side is more likely a source for ingress via this 'thru-hull'.

Otherwise, I can't see a good reason to even seal the edge w/3M 4200, from top or bottom.