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Or am i able to cut the cast iron pipe as low as possible and then hammer in a rubber fernco donut?

Hey All, Looking for some plumbing DIY help. I have a 4" cast iron pipe for a vent stack. A smoke bomb was performed on the system and most of the smoke came from the top half of the pipe. I have replaced the top with PVC and performed another smoke bomb. There is a small leak now that is...