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They make both kinds. Just make sure it fits snug before you glue it. there are several types a 3x4 fits over 3" and inside 4" but there are ones that will go over 4" and inside 3" I had the same question, especially after installing a 3" flange inside a 3 inch pipe. The trouble with this is that you are 'narrowing down' the drain opening (i.e. restricting the flow) so that clogs are more likely. I know, cause I clogged mine and then my wax ring blew out (while removing the clog), so I had to pull toliet off. I cut out my old flange and replaced it with a 3/4 flange that fit OVER the outside of the 3" pipe. Now when you look down at the flange, you now have a 4" hole, not a narrow 3". The less restrictive opening should help prevent clogs (I hope).

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20y ago

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