A dishwasher air gap is a small but essential device that prevents dirty water from flowing back into your dishwasher, keeping your kitchen safe and sanitary. If your local plumbing code requires one—or if you want extra protection against backflow—you’ll need to install it correctly.
Luckily, installing a dishwasher air gap is a straightforward process. Let’s break it down step by step!
What You’ll Need
✔ Dishwasher air gap kit (includes the air gap and mounting hardware)
✔ Two hose clamps
✔ Utility knife or tubing cutter
✔ Screwdriver or wrench
✔ Pliers
✔ Hose (if not included in the kit)
Step 1: Choose the Right Location
Most air gaps are installed on the sink or countertop, usually near the faucet. If your sink has a pre-drilled hole (often used for soap dispensers or sprayers), that’s the perfect spot. If not, you may need to drill a 1-3/8 inch hole.
Step 2: Connect the Air Gap to the Dishwasher Drain Hose
- Locate the small inlet on the air gap. This is where the dishwasher drain hose will connect.
- Slide a hose clamp onto the drain hose.
- Attach the hose to the small inlet and tighten the clamp using a screwdriver or pliers.
✅ Tip: Make sure the hose is secure to prevent leaks!
Step 3: Connect the Air Gap to the Drain or Garbage Disposal
- Find the larger outlet on the air gap.
- Attach a second hose to this outlet using another hose clamp.
- Run the hose to either:
- The sink drain (connect it to the sink tailpiece).
- The garbage disposal (attach it to the disposal inlet—remove the knockout plug inside if it’s not already open).
✅ Important: Make sure the drain hose forms a smooth downward slope to prevent water from pooling.
Step 4: Secure the Air Gap in Place
- Insert the air gap stem into the pre-drilled hole on the sink or countertop.
- Secure it underneath with the provided locking nut. Tighten it by hand, then give it a final turn with a wrench.
- Snap on the decorative air gap cover on top.
Step 5: Test the Installation
- Run your dishwasher on a short cycle.
- Watch for leaks or water backing up into the sink.
- If water sprays out of the air gap, check for blockages in the drain hose.
Final Thoughts
Installing a dishwasher air gap is an easy but crucial step in ensuring clean, sanitary drainage for your dishwasher. With just a few tools and a bit of time, you’ll have a properly installed air gap that protects your kitchen from potential water contamination.