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Leak Around Top: Existing Garbage Disposal


How to diagnose a problem with a garbage disposal-This article deals with leaking around the top of the disposal. This information is specifically for existing disposals, not new installations.

Leak Test

  1. Place a sink stopper in the sink and fill the sink with water.
  2. Wrap paper towels directly at the very top of the garbage disposal around the sink flange.
  3. Wrap paper towels around the drain discharge elbow on the side of the garbage disposal where it connects to the garbage disposer.
  4. Wrap paper towels around the dishwasher connector on the side of the garbage disposal where it connects to the dishwasher.
  5. Once you have wrapped all the necessary places, release the stopper and let the water drain.
  6. Check all of the paper towels to see if they are wet. If any are wet, the leak is coming from that area and is caused by an issue with the installation of that specific item.
disposal leak at top.png

1-Sink Flange

2-Rubber or Fiber Gasket

3-Cushion Mount

Leaking around the top of a garbage disposal is usually caused by one of the following.

Deterioration- Inspect the mounting hardware, rubber or fiber gasket, and cushion mount for any damage or deterioration and replace if necessary. Any one of these items could cause leaking

Loose Screws- Verify that the mounting assembly screws have not loosened.

Worn Sealant- If the sealant is worn down then it won't seal properly and will need to be replaced with new sealant.

For a comprehensive guide, visit and select the type of garbage disposal you are repairing. The garbage disposal guide will contain specific information associated with that style of product.

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