if you've got an inspection port put the valve of choice in that. if you don't like the setup you are then in left with two choices. replace the cap or seal it up(epoxy tape hubba bubba your choice) don't drill your hulls if you don't have too.
I have a dark hull in s.fla. and the hulls do get hot enough to cause the inspection ports to jump 4' up when realeased.
cedar tornado classic, sunfish, 1972 morgan 27 optidad
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