bought boat with stuck plug, previous owner never removed it since it had a sump pump and it was also stored indoors. The plug is stuck in the flange and I've tried a lot to get it out...I even tried some heat and I think I might have affected the sealant because there is a yellowish stain around the garboard now. however, IT IS NOT taking on any water but after using heat I decided AND the fact I can't get the plug out, I decided it might be best to just replace the whole thing. I am am going to try to remove the plug again and it it does come out, then I may not replace the entire flange since despite my stupidity of heating it up, it isn't leaking and a new plug alone should be all I'd need. BUT if that doesn't work, then you now know why I am thinking I must replace the whole thing.