An air gap in your dishwasher acts as a safety device, preventing any contaminated water from flowing back into your dishwasher and potentially contaminating your dishes and utensils. Installing an air gap for your dishwasher is a significant step in ensuring the proper functioning and longevity of your kitchen appliances.

Tools and Materials Needed

Before you begin the installation process, gather the following tools and materials:

  • Dishwasher air gap kit (including the air gap device, plastic inlet and outlet tubes, gasket, and mounting hardware)
  • Adjustable wrench or pliers
  • Screwdriver
  • Pipe cutter or hacksaw (if required)
  • Teflon tape
  • Towel or rag

Step-by-Step Installation Process

Follow these steps to install an air gap for your dishwasher:

Prepare for Installation:

  • Turn off the dishwasher’s power supply by unplugging it or switching off the circuit breaker.
  • Close the sink’s drain stopper or place a rag in the drain to prevent any small parts from falling into it.

Choose the Air Gap Location:

What Are Dishwasher Air Gaps and Are They Necessary?
Understanding Dishwasher Air Gap Installations
  • Look for a suitable location on the sink or countertop for installing the air gap. It should be close to the dishwasher and easily accessible.

Assemble the Air Gap:

What Are Dishwasher Air Gaps and Are They Necessary
How to install a dishwasher air gap
  • Take the air gap device and separate the upper and lower rings.
  • Slide the plastic inlet tube into the lower ring and attach the gasket to the bottom of the upper ring.
  • Insert the plastic outlet tube into the upper ring, ensuring a snug fit.

Mount the Air Gap:

  • Position the assembled air gap in the chosen location on the sink or countertop.
  • Mark the mounting holes and drill pilot holes if necessary.
  • Securely fasten the air gap using the provided mounting hardware.

Connect the Inlet Tube:

How To Connect Water Supply To A New Dishwasher
How to Connect the Water Supply to the Dishwasher

Connect the Outlet Tube:

How to Make Dishwasher Drain Hose Connections
Making Dishwasher Drain Connections
  • Identify the sink drain or garbage disposal pipe.
  • Remove the existing drain line or tailpiece from the sink drain or disposal.
  • Connect the plastic outlet tube from the air gap to the sink drain or disposal pipe.
  • Use Teflon tape on the threaded connections for a watertight seal.
  • Tighten the connections with an adjustable wrench or pliers.

Check for Leaks:

Common Causes of a Leaking Dishwasher
Fix a Leaky Dishwasher
  • Once all connections are secure, turn on the dishwasher’s power supply.
  • Run a test cycle to check for any leaks around the air gap and connections.

Frequently Asked Question

Is an air gap required for my dishwasher?

The requirement for an air gap varies depending on local plumbing codes and regulations. It’s recommended to check with your local authorities to determine if an air gap is mandatory in your area.

Can I install the air gap myself, or do I need professional help?

Installing an air gap can be a DIY project for those with basic plumbing knowledge. However, if you’re uncertain or uncomfortable with the process, it’s always a good idea to consult a professional plumber to ensure proper installation.

What if I don’t have enough space on my sink or countertop for an air gap?

If space is limited, you can consider installing a high loop in the dishwasher drain hose as an alternative method. This involves attaching the drain hose to the underside of the countertop or attaching it to the wall above the sink at a height higher than the sink drain or disposal inlet.

How often should I clean or maintain the air gap?

It’s recommended to clean and inspect the air gap periodically to ensure it remains free from debris and blockages. Cleaning it every six months and removing any obstructions will help maintain its proper functioning.

Can I use any type of tubing for the inlet and outlet connections?

It’s essential to use the tubing provided in the dishwasher air gap kit. These tubes are specifically designed for this purpose and ensure the proper flow and prevention of backflow.

Key Notes and Important Points:

  • An air gap is a vital component to prevent contamination and backflow in your dishwasher.
  • Follow the installation steps carefully and consult a professional if needed.
  • Ensure proper connection of the inlet tube to the dishwasher’s drain hose and the outlet tube to the sink drain or disposal.
  • Regularly clean and maintain the air gap to avoid any clogs or blockages.
  • Check your local plumbing codes to confirm if an air gap is required in your area.


Installing an air gap for your dishwasher is a crucial step to ensure proper drainage and prevent contamination. By following the step-by-step installation process and using the provided materials, you can set up your air gap effectively. Remember to check local regulations and perform regular maintenance to keep your dishwasher functioning optimally.

Similar Posts

Leave a Reply