Toilet flange extender

Discussion in 'Toilet Forum discussions' started by dmack43, Mar 6, 2012.

  1. dmack43

    dmack43 New Member

    May 4, 2009
    A new tile floor has resulted in a finished surface 3/4 of an inch above the existing 4" cast iron flange which is seated in the concrete slab floor. The inside of the cast iron pipe - where it is level with the flange - is slightly irregular (lead?) and may make it difficult to insert a rubber gasket in to the 4" pipe. I plan on installing a new low flow toilet and would appreciate advice on selecting an extender and gasket.

  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Jan 5, 2008
    Test, Don't Guess!
    Land of Cheese
    Sioux Chief makes flange extenders in both 1/4 and 7/16 thicknesses, either of which can be stacked to create the desired thickness. The extenders go on top of the existing flange- there is no gasket.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    Besure to seal between the flange and extender(s), and secure the extenders because plastic has a tendency to "warp" over time if it is not firmly anchored.
  5. Runs with bison

    Runs with bison Member

    Aug 23, 2009
    Yes, and that's in the instructions for the Sioux Chief extenders as well (printed on the ring.) Don't let the big box store former "plumbers" talk you out of this sealing step by telling you, "I never do that."
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