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I had a leaking bottom seal for my first floor half bath toilet, buckling linoleum tiles. I took up the linoleum and 0.7 in composite board that sits on the primary subfloor.

As part of this renovation I used an oscillating saw to cut away the upper portion of the toilet flange from the 3"PVC pipe. I now have the female portion of the flange to contend with in replacing the flange.

view of plumbing from below

I've tried a little using a chisel to remove outer portion of the flange, but it's slow going and I haven't made any real progress.

Is it easier to just cut the PVC from below and use a female-female coupler?

Additionally, what kind of saw should I use? I assume the cut should be pretty straight and without void space.

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    The cut dosent have to be absolutely straight but should be chamfered inside. I usually cut the pipe use a coupler and new flange that I set when the sub floor and cement backer is finished for tile jobs. – Ed Beal Aug 21 '16 at 20:37
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cut the closet elbow off then use a coupler to add the new elbow and flange

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  • Is this 3 or 4" pipe? Adding a coupler may give you too much pipe vertically such that the flange won't be where you want it. I would go to my local hardware store and look into flange replacements that sit inside the old pipe. They often have red or black rubber gasket on them which may or may not be used, depending on your needs. There are other flange replacements that sit on the outside, but then you may have to chisel or use a hole saw to cut off the old outer part. This in turn endangers the pipe...you don't want to crack it. So explore more options b4 you cut any further. – DAS Feb 2 at 21:17
  • See Oatey twist and set flange at orange box box – DAS Feb 2 at 21:20

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