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I did my drain tube I don't like it but it will do. I think if I was to do it over I would put it through from the inside out mark the tube at the out side of transom and cut it 1/8 inch at the same angle of the mark around the tube. The flare on the outside never changed so it's at a 45 degree angle and the transom is not so I have space at the bottom of the tube between the transom and the flare the top is tight and the inside flare is perfect because I cut it at an angle. Oh, and both O-rings came off so I hope the 5200 3m is good stuff or I'll get water in my hull. Hope this helps someone.
Live and learn.

Kevin