How to Install a Sink Flange

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The sink flange is the visible portion of your drain in the bottom of the sink. These are usually made of metal, although PVC is an increasingly preferred choice. The flange connects to a piece of plumbing called the tail piece beneath the sink. To install the sink flange, you place the flange in the sink and then connect the tail piece from beneath. One of the key parts of the process involves placing putty or caulk underneath the flange when installing it, to prevent leaks.

Things You'll Need

  • Sink flange
  • Tail piece
  • Rubber washer
  • Jamb nut
  • Clean out the bottom of the sink where the flange will be installed. Scrape away any old plumber's putty or caulk with a putty knife. Wipe up any mold or mildew with a rag and bathroom cleaner. Ensure that the sink surface is dry.

  • Turn the flange over. Roll out a bead of plumber's putty. Press this into place on the underside of the flange. Turn the flange right-side up. Insert the flange into the drain opening at the bottom of the sink, turning as you do so to help distribute the putty.

  • Hold the flange with one hand while you position yourself underneath the sink. You may need an assistant to hold the flange if you own a large sink. Screw the tail piece into the underside of the flange.

  • Apply pipe thread compound to the threads on the bottom of the sink around the drain exit. Screw the jamb nut into place until it's flush with the bottom of the sink.

  • Slide the rubber washer over the end of the tail piece.

Tips & Warnings

  • Some plumbers prefer to use silicone caulk in place of plumber's putty.

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References

  • Photo Credit down the drain image by pix29 from Fotolia.com
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