I have a 3" cast iron toilet drain pipe that runs vertically inside the wall from a second floor bath down to the main drain under the house. I am putting a two gang meter base (it's a duplex) on the outside of that wall. What is the required horizontal distance between the meter base and the pipe?

Thank you!

  • 0 inches sounds about right.
    – Ecnerwal
    Sep 24, 2020 at 13:35
  • The pipe can be behind the meter base I would not trap plumbing like that but there is no minimum on the other side of a wall.
    – Ed Beal
    Sep 24, 2020 at 15:43


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