Now that you mention that, I remember the cleanout plug on the new tee dripping some water also, then I tightened it up and it almost all stopped. (I did not have the teflone tape with me, so that was missing also). But I did wonder why that part had a leak too. I only had the sink running about half pressure at the time, and did wonder if the new 2" pipe was overwhelming the drain pipes, and that was why some was backing up and out the cleanout plug.?
So you think I did not remove too much of the inside of the cast iron?
The inside diameter of my cast iron, looked to me to be about 3.25" to 3.50". I measured the donut before putting it in, and it was right about 3.25".
Do you think just snaking it will fix it, or do I need to find a larger donut also?
Are you talking about renting a industrial strenght snake that runs off a drill motor, or just the manual, by hand, type? I don't recall it backing up before I put the new pipe in?
(I did leave a 1.5" pipe in the cast iron while drilling most of the lead out. Some did get in the bottom of the drain, but I think I vacumed all of that out).