How to Remove a Tight Sink Flange

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When it comes time to repair your sink drain or upgrade it, you will need to remove the sink flange. By the time your sink is in need of work, however, the sink flange is often corroded or rusted and stuck in place. Since the flange does not have any readily apparent way of grasping it firmly for removal, it pays to know a method for getting a stubborn flange off.

Things You'll Need

  • Liquid spray penetrant
  • Set of open ended wrenches
  • Channel locks
  • Block of wood (about 4 inches square)
  • Hammer
  • Spray liquid penetrant on all the threads of the joints in the drain under the sink. Allow the penetrant to work on loosening any stuck connection joints for about an hour.

  • Take off the coupling nuts to the sink trap using an open ended wrench, and remove the trap. Go back to the top side of the sink, pop up the drain plug, twist the plug in a counterclockwise direction and pull it out.

  • Take off the jamb nut using a pair of channel locks. Unscrew the tailpiece from the sink flange by twisting it counterclockwise.

  • Position yourself under the sink so that you can hold a block of wood up against the bottom of the flange. While holding the wood block there, tap it with a hammer to dislodge the flange and knock it up into the sink above where you can remove it.

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