Plastic thru-hull fitting
The thru-hull fitting that came the boat from the factory, was plastic. Afew years ago I read an article about all the sinkings from this type of fitting. It was said, that one should check for cracking. If cracking was found, it needed to be replaced "now". The replacement should be the bronze type sold at boatus, or west marine stores. If this is not the problem, the only thing left I can think of, is the cockpit drain. This is a real fun one, to get at. You have to get to the back, through the port bunk, or in the cockpit locker. Being small, and thin is a big plus, for this task. Having a second person, with a garden hose, to spray water, while you check from inside is a big help.Hope this puts you in the right area.Let us know how you made out.Jim G.s/v: Dream Maker