How do I cut a round 2" hole in a verticle 4" cast iron pipe?

Wouldn't you have to use an acetylene torch to do that sort of work?

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Originally Posted by Lou166

How do I cut a round 2" hole in a verticle 4" cast iron pipe?

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A much better way would be to cut in a 4 X 2" sanitary tee into that stack. Even if you could cut a 2" hole in the cast iron how would you connect anything to it? What do you want the hole to connect to? Regards, Tom