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Old 01-17-2006, 09:00 PM
Brian Carlton Brian Carlton is offline
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Join Date: May 2002
Location: Blue Point, NY
Posts: 25,390
I'm older than you are and I only have encountered 3" drains...........the bottom of the toilet is a 3" opening.

Now, downstream......the pipes typically open up to 4"........but not at the closet, AFAIK.
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