The ones in mine are definitely brass (not bronze). They must have been replaced then. They held up all season this year, maybe I should just leave them for now. I'm not ripping up my deck or anything like that this year so I could be opening up a whole can of worms that I don't want to get into right now.
I thought the process would be as simple as knocking out the old and plastering with 5200 (or sealant of your choice) a new tube up the whole with the flange tool.
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