PVC toilet flange to fit on the outside of a 3" PVC hub fitting?

Discussion in 'Toilet Forum discussions' started by davetrouble, Mar 12, 2021.

  1. davetrouble

    davetrouble New Member

    Mar 12, 2021
    I am replacing a toilet flange for a 3" PVC hub fitting. I understand that one option is a PVC 3" spigot flange that is designed to fit inside a 3" PVC hub fitting. But it also occurred to me that a PVC 4" spigot flange that is designed to fit inside a 4" PVC hub fitting might also fit on the outside of a 3" PVC hub fitting. That is, as long as the wall thickness of the 3" hub fitting was 1/4". Now, when I measure the wall thickness of the particular 3" hub fitting that I am dealing it does indeed appear to be 1/4". However, I am not able to find anywhere where the wall thickness of a 3" PVC hub is specified to be 1/4" nor can i find anywhere where it is mentioned that a PVC 4" spigot flange will fit on the outside of a 3" PVC hub fitting. So I am wondering if this is a reasonable option or not?
  2. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    You have reinvented a common item. That is what the 4x3 pvc glued closet flange is-- can fit over a 3 inch pvc pipe, or inside a 4 inch pvc pipe.
    Last edited: Mar 12, 2021
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  4. wwhitney

    wwhitney Well-Known Member

    Mar 17, 2019
    Berkeley, CA
    What the OP is describing is different, it would fit inside a 4" hub (a 4" spigot end closet flange) and possibly outside a 3" PVC hub (rather than use a 3" spigot flange inside the 3" hub).

    My comments: hubs often have embossed printing on the outside that would interfere with the fit--best case is that you grind them off and then the fit happens to work. But I see no upside--just use a 3" spigot flange. The opening at the bottom of the toilet is smaller than 3" anyway.

    Cheers, Wayne
    Tuttles Revenge and Reach4 like this.
  5. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington

    They also make these for PVC. This one is ABS.

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