How to Install a Garbage Disposal Drain

Install a garbage disposal drain in your sink.
Install a garbage disposal drain in your sink. (Image: kitchen sink image by jedphoto from

Garbage disposals are handy devices helpful in eliminating organic waste in the kitchen. Additionally, they help reduce garbage by breaking down waste in the kitchen sink. Installing a garbage disposal drain consists of three connections: mounting a bracket in your sink, hooking up the electricity and connecting your disposal to your home's plumbing.

Things You'll Need

  • Electrical connection
  • Garbage disposal and included mounting rings
  • Plumber's putty
  • Phillips screwdriver
  • Plumber's tape
  • Pipe
  • Hacksaw

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Install an electrical circuit for your garbage disposal if one is not present. Terminate the circuit beneath the sink at either a plug or open wires for a terminal connection, depending on your disposal make and model. Include a switch located near the sink so the electricity to the disposal can be switched on and off. Ensure that the power to the circuit is shut off while you're installing the disposal.

Turn the sink drain flange over. Roll out a bead of putty and press it into place around the edges. Turn the flange right-side up and press it into place on the drain, turning as you do so to help distribute the putty.

Position yourself underneath the sink. Have an assistant hold the flange in place at the top while you screw in the mounting bracket for the disposal from underneath.

Insert the disposal into the mounting ring. Rotate the disposal clockwise until you hear the rings lock together. Fasten the rings together by securing the mounting locks with a Philips screwdriver.

Wrap the threads on the disposal outlet with plumber's tape. Trim off any excess with scissors.

Connect the garbage disposal to the power supply. If your disposal has a plug and you installed an outlet in Step 1, simply plug in the disposal. To hardwire the disposal, remove the disposal terminal cover with a screwdriver. Connect the black wire to the terminal marked "hot" or "live" on the disposal, connect the white wire to the terminal marked "neutral" and the green wire to the terminal marked "ground." Trim the wires with wire cutters and strip off enough wire at the ends to make a tight connection at the terminal. Tighten the terminals with the Phillips screwdriver. Replace the cover when you're finished.

Connect the disposal outlet with the sewer inlet beneath the sink, using additional plumbing. The type and length of your plumbing joints depends on how much room you have. PVC pipes are an excellent choice because they're easy to cut with just a standard hacksaw.

Restore the power supply.

Tips & Warnings

  • The above steps are just a guideline. Always follow the specific instructions that came with your garbage disposal.
  • Have a professional install your electrical connection if you're unsure of the procedure.


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