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How to Remove a Brass Closet Flange From a Cast Iron Drain

A closet flange doesn't go in a closet. That's why it commonly goes by the more plausible name "toilet flange." The closet flange or toilet flange is a round gasket that fits between a sewer pipe and a toilet, thus attaching the toilet to the sewer system. If you have a brass flange and need to remove it from a cast iron sewer drain, the process typically requires only basic hand tools, though force is often required to break the flange threads free from the rubber gasket that holds it in place.

Things You'll Need

  • Wrench
  • Socket wrench
  • Pry bar
  • Utility knife
  • Rag
  • Gloves
  • Safety glasses
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Instructions

    • 1

      Shut off the flow of water to the toilet by turning the shutoff valve counterclockwise. Look for the valve on the wall behind the toilet or in a basement area or crawl space. Flush the toilet to drain out the water.

    • 2

      Locate the metal coupler that attaches the water tubing to the rear of the toilet and detach it using a wrench.

    • 3

      Place the wrench around the nuts over the bolts at the bottom of the toilet, which attach it to the floor. Loosen the nuts until they come free. Grasp the toilet and pick it straight up so it slides over the bolts. Set the toilet aside.

    • 4

      Grasp one of the toilet bolts that sticks up out of the flange. Slide it toward the oval opening, then pull it out of the flange. Repeat the process on the other side of the flange to detach the other bolt as well.

    • 5

      Look at the top of the brass flange for three to four bolts that hold it to the drain pipe. Loosen the bolts using a socket wrench, then pull them straight up out of the flange. Pull the upper portion of the brass flange out of the opening using your hands.

    • 6

      Insert a pry bar under the exterior portion of the flange that is still in the floor and pry it up. There is a rubber gasket inside the flange that makes removal slow, but the flange will side up over it slowly.

    • 7

      Cut the remaining rubber gasket using a utility knife and pull it up away from the cast iron drain.

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