Garbage disposals are a convenient kitchen appliance that makes meal prep and cleanup a breeze. However, over time, even the best disposals can wear out or become outdated, requiring a replacement. In this article, we will guide you through the process of removing an old garbage disposal and installing a new one.

Step 1: Gather Your Tools and Supplies

Before you begin, make sure you have all the necessary tools and supplies on hand.

To Install a New Garbage Disposal You will need:

  • a pair of pliers
  • a screwdriver
  • a bucket
  • a putty knife
  • a new disposal unit
  • plumber’s putty
  • and electrical tape

Garbage Disposal Installation

Step 2: Turn off the Power and Disconnect the Old Disposal

First, turn off the power to the disposal unit by unplugging it from the outlet or switching off the circuit breaker. Next, disconnect the drain and plumbing connections from the disposal. Use pliers to loosen and remove the nuts that hold the P-trap and the dishwasher connection in place.

Place a bucket underneath the P-trap to catch any water or debris that may spill out.

Step 3: Remove the Old Disposal Unit

Using a screwdriver, loosen and remove the mounting assembly that connects the disposal unit to the sink. This may involve removing screws or using a special mounting tool that comes with the disposal. Once the mounting assembly is removed, carefully lower the old disposal unit and set it aside.

Step 4: Clean the Mounting Area

Use a putty knife to scrape away any old putty or debris from the mounting area on the sink. Clean the area thoroughly with a damp cloth.

Step 5: Install the New Disposal Unit

Apply a thin layer of plumber’s putty around the mounting surface on the sink. Lift the new disposal unit into place, aligning the mounting assembly with the mounting surface on the sink. Tighten the screws or use the mounting tool provided to secure the mounting assembly in place.

Step 6: Connect the Plumbing

Connect the drain and plumbing connections to the new disposal unit, using pliers to tighten the nuts. Reconnect the dishwasher connection if necessary.

Step 7: Test the New Disposal Unit

Restore power to the disposal unit by plugging it back in or turning on the circuit breaker. Turn on the water and test the new disposal unit to make sure it is working correctly.


In conclusion, replacing an old garbage disposal with a new one is a relatively simple process that can be completed in a few hours with the right tools and supplies. However, don’t try this at home unless you are confident in your abilities and you have the proper equipment.

By following the steps outlined above, you can remove the old unit and install a new disposal unit, ensuring your kitchen remains clean and functional for years to come. Or you can simply call a plumber, a rest easy knowing it was installed by a certified professional.


Schedule a plumber if you need assistance installing your garbage disposal, we are happy to help.

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