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It ended up that I decided to cut the fitting apart. Nothing I tried could budge it outwards at all, though as noted it would wiggle around in other directions; so this started to convince me there was a "connection" inside more than just friction. (I tried pulling, rotating, using a 4" lever, vice grips, etc.) I cut the PCV with a demo saw in 2 places and ...


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If it's all one piece I'm inclined to believe you have a donut and coupling similar to the ones below installed in you cast iron pipe. I have only used these one time, but I had to hammer the piece of PVC into to rubber donut because it fit so tight. Some PVC fittings have a lip at the tip, like the one below, that would make it harder to remove once it ...


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Yes, that is signs of corrosion and in another 100-150 years, that will result in leaks in that pipe...


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