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

    Joined:
    Mar 12, 2021
    Location:
    massachusetts
    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

    Joined:
    Sep 25, 2013
    Location:
    IL
    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

    Joined:
    Mar 17, 2019
    Location:
    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.
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