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Leak Around Top: New 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 newly installed disposals, not exisitng units.

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 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.

Not enough sealant used-If there is too little or no sealant used under the sink flange than it can result in leaking around the sink flange.

Black rubber or fiber gasket-The gasket needs to be seated flat against the underside of the sink.

Loose screws-If the mounting hardware screws are loose this will allow for movement which can result in leaking.

Damaged cushion mount- Replace part (Moen Part # 1824).

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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