Size
I'm going to my 303 tomorrow. But as I remember, it is larger than the 3" but smaller than the 4". So you will need enlarge the hole and use the 4". Which is why our new Nicro vent is still sitting on a shelf from WM's sale last year. Our new install will involve a fair amount of epoxie repair to the balsa core, but I stopped the leaks at the vent and we are still chasing after other, worse ones. And the voltage regulator does not work and involves a jury rigged GM alternator. And I cannot find replacement screws for the cabintop hand holds which I have removed (10x32 5" long). And the exhaust hose rubs against the deck scupper and is nearly rubbed through. And the dock lines still need to be replaced from the hurricanes of two years ago. And even though I have a full page of other minor items on THE LIST and there are still many other leaks we need to chase down, and even though the wind is predicted to be from 0 - 10 changing from ENE to SSE I think we will get out and raise a sail. We may end up only breaking wind, but it is time to let some projects go and remember why we have a boat. IMHO, Thom
Dave s/v Wind Dreamer II