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What is that wide-diameter fitting in my 2" PVC stack?

It's in the way of the hardwood floor and the drywall. Can it be effectively removed?

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  • I can't be positive but I think it is a check valve. I would not remove it - perhaps lower it a few inches but do not remove it. Prevents back flow. – Ken Apr 2 '18 at 9:26
  • What's the pipe for? Apparently it isn't a typical drain stack, which wouldn't require a check valve, which is apparently needed here for some reason. – isherwood Apr 2 '18 at 14:16

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