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I almost hate to ask this here because the correct answer is to call a plumber... but... my customer doesn't use this bath and she really would like me to fix this on the cheap, even if it only lasts a year.
So here's the deal. It's a 4" lead toilet flange/elbow that appears to be soldered to a cast iron nipple that goes into the main stack. It barely leaks, but she doesn't want to leave a bucket permanently on the floor.