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How To Cap Off A Dishwasher Drain On The Garbage Disposal (Fast And Simple)

Are you tired of dealing with a leaky dishwasher drain that’s connected to your garbage disposal? Disconnecting the dishwasher drain from the disposal unit can seem daunting, but with the right tools and patience, it’s a relatively simple process.

In this article, we’ll guide you through the steps on how to cap off the dishwasher drain on the garbage disposal, so that you can win your kitchen back.

Gather the Necessary Tools

Capping off a dishwasher drain on the garbage disposal can seem like a daunting task, but with the right tools and a little bit of knowledge, it can be done in a few simple steps. Before starting the job, ensure you have all the necessary tools. You will need:

  • A basin wrench: The basin Wrench is a special type of wrench, designed to reach tight spaces, making it ideal for working under the sink. The basin wrench will allow you to loosen the nut that holds the dishwasher drain to the disposal unit.
  • Adjustable pliers: Adjustable pliers can be found at various hardware stores and home improvement centers.  
  • Teflon tape: Teflon tape is also important, as it is a type of plumber’s tape used to prevent leaks. You’ll wrap Teflon tape around the threads of the dishwasher drain cap before attaching it to the drain to ensure a tight seal.
  • A dishwasher drain rubber cap: A dishwasher drain cap is a small device that is used to seal the end of a dishwasher drain, typically in a situation where the dishwasher is being removed or is no longer in use. It is usually a simple, screw-on cap that fits over the end of the drain and provides a tight seal to prevent water from leaking out.   
  • Plumbers putty
  • Tee fitting
  • Screwdriver
  • Silicone caulk
  • Flashlight

It’s a good idea to have all of these tools on hand before starting the project, so you can work efficiently and effectively. Make sure to choose high-quality tools that will last and do the job correctly.

How to Cap Off Dishwasher Drain on the Garbage Disposal?

How to cap off dishwasher drain on the garbage disposal
Credit: HGTV

Step 1: Turn off the water and electricity

Before starting the process of capping off the dishwasher drain on the garbage disposal, it’s crucial to turn off the water and electricity supply to the disposal unit. This will prevent any accidents or damage to the unit while you’re working on it.

To turn off the water supply, locate the valve under the kitchen sink that controls the water flow to the garbage disposal and turn the valve clockwise until it’s in the closed position. This will turn off the water supply to the unit and prevent any leaks or spills while you’re working. 

Next, turn off the electricity supply to the garbage disposal. This can usually be done by turning off the switch or circuit breaker that controls the power to the unit. If you’re unsure where the switch or circuit breaker is, consult the owner’s manual or a professional electrician for assistance.

If you need any help locating and shutting off your water supply, you can use this video guide to help you.

Step 2: Disconnect the dishwasher drain hose

Now that you’ve gathered the necessary tools and turned off the water and electricity supply, it’s time to disconnect the dishwasher drain from the garbage disposal. Put a bucket underneath, then use the basin wrench: place the basin wrench over the nut that holds the dishwasher drain hole to the disposal unit. 

Turn the wrench counterclockwise to loosen the nut. This may take some effort, so be patient and use caution not to damage the nut or the dishwasher hose.

Step 3: Remove the Pipe

The dishwasher drain is typically located near the bottom of the garbage disposal, and it’s connected to the drainage hose with a pipe.

Using a clamp, loosen the screw that holds the dishwasher drain pipe in place and remove the pipe from the disposal.

Step 4: Install the Plug

Take the plug and insert it into the end of the hose where it was removed from the disposal. Make sure the plug fits securely in the pipe and that there are no leaks.

Step 5: Reattach the Pipe

Reattach the Pipe
Credit: farm food family

Reattach the pipe to the disposal and tighten the screw with the clamp to ensure a tight.

Step 6: Check for Leaks

Turn the water supply back on and wait to check for any leaks at the drain connection between the pipe and the plug. If there are no leaks, your dishwasher drain is now capped off and will not be connected to the garbage disposal.

Step 7: Install an Air Gap (Optional)

An air gap is a plumbing device that separates the dishwasher drain from the rest of the plumbing system, allowing air to flow in and out of the dishwasher drain. This helps prevent water from flowing back into the dishwasher, which can cause problems with your garbage disposal. If you’d like to install one, you can purchase it at a hardware store and follow the manufacturer’s instructions.


Capping off a dishwasher drain from the garbage disposal unit is a great way to ensure that debris and food particles don’t get mixed up and contaminate your clean dishes.

By following the steps outlined in this article, you’ll be able to complete this task quickly and easily, resulting in a more hygienic and efficient dishwashing process. Not only will this benefit the cleanliness of your dishes, but it will also protect your garbage disposal from any damage that could be caused by foreign objects.

And if you have any questions or concerns about this process, please don’t hesitate to reach out in the comments.

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