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Thread: 5" inside diameter toilet flange - cast iron

  1. #1

    Default 5" inside diameter toilet flange - cast iron

    I have a 5" inside diameter toilet flange that's 1 1/2" deep that's connected to a 4" inside diameter cast iron waste pipe. The problem is wax rings are made for 3" and 4" openings. Is there a wax ring for a 5" opening or what do you recommend to reduce the opening to 4"?

    Ken - Chicago, Il

  2. #2
    Plumber, Contractor, Attorney LonnythePlumber's Avatar
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    Default Regular Wax

    A regular wax should fit. The inside of 4" or 4 x 3 flanges are almost five inches. I have not hear of a 5" toilet flange.

  3. #3
    DIY Senior Member e-plumber's Avatar
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    Lightbulb Wax Gasket

    Although I never had this problem...
    Instead of reducing the (closet flange) drain opening you would be better off combining a small section of a second wax seal to another one to make the diameter larger if that's what you need to do.
    e-plumber

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default flange

    Apparently the 4" cast iron pipe is not long enough to reach the surface of the flange, the way it should. A plumber would caulk a section of pipe inside the flange so the new opening would be correct for a wax ring.

  5. #5

    Default flange

    EJ,
    What type of pipe do you recommend caulking in there? What will fit? A piece of iron pipe or PVC? I think if I reduced the opening down to an inside diameter of 4", the wax ring would give me a better seal in the long run so I don't have to repair the floor again. The plumbing guy at local Home Depot said this might be a commercial fitting that was put on my toilet.

    I just talked to a commercial plumbing supply house. Apparently my situation is common plumbing technique in the Chicago area. The flange is 5" diameter with a 1 1/2" drop connecting to a 4" waste pipe. A regular wax ring should do the trick. Apparently, the original installation had a plumber's putty like consistency that reduced this 5" opening to about 4" (this material was very stiff and flaking) when I originally removed it.
    Last edited by k.look; 11-29-2004 at 07:54 AM. Reason: more information

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Default 5"

    The "5"" flange is really a 4" one, but the 4" pipe is too short. The best solution would be a 1 1/2" piece of cast iron pipe caulked, (leaded), into the flange to raise the 4" to the finish floor elevation. Failing that a piece of 4" ABS or PVC could be inserted and siliconed in place so it lines up with the existing 4" pipe.

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