You will need to cut the cast iron.
You will either need to make a large enough hole for a chain cutter, or
a sawsall. If you go with the Sawsall, you will need to purchase a
carbide grit edge blade. They are very slow. You might want to buy
two, return #2 if you don't use it. Did I tell you that they are very
slow? Once cut, Fernco adapters will finish the job.
Keep the whole world singing. . .
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