Remove the Old Air Gap — Clean the Air Gap Internals
Part of project
How to Clean or Replace a Dishwasher Air Gap · Step 3 of 9
In this video
From the top of the sink, unscrew the decorative cap and the large plastic nut holding the air gap in place. Pull the old air gap assembly down from under the sink. Place a bucket underneath to catch any water. Use a screwdriver to loosen the two hose clamps securing the dishwasher and garbage disposal hoses. Wiggle and pull both hoses off the old air gap nipples to completely remove it.
Goal: Disconnect and remove the old air gap assembly
- Be prepared for some water to spill from the hoses when they are disconnected.
Used in this video
- Screwdriver (brand: HDX, Screwdriver_Type: Flathead) — Loosening and tightening the hose clamps
- Bucket · optional — Catching residual water from the drain hoses
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FAQs
How can I tell if my dishwasher drainage problem is definitely caused by a clogged air gap?
Look for standing water in the bottom of your dishwasher, slow draining, or water backing up into your sink when the dishwasher attempts to drain. A visual check of the air gap cap for visible debris or a gurgling sound during the drain cycle can also indicate a clog. Sometimes, water might even spray from the air gap cap.
What are the most important safety precautions I should take before starting this project?
Always turn off the power to your dishwasher at the circuit breaker and shut off the hot water supply valve located under the sink before beginning any work. Have towels ready to absorb any spilled water, and consider wearing gloves to protect your hands from grime and potential sharp edges. Never work with electrical components or water without cutting power first.
The project lists several tools; which are absolutely essential if I'm on a tight budget or a beginner?
For cleaning, you'll primarily need a Phillips head screwdriver to remove the air gap cap and a small brush or pipe cleaner for clearing debris. If replacing, you'll also definitely need soft-jaw pliers for hose clamps, a bucket for catching water, and the new air gap unit itself. Many items like the UV flashlight or specific brand towels are optional comforts rather than strict necessities.
When should I attempt to clean the air gap versus opting for a full replacement?
Start with cleaning if you suspect a blockage from food debris, grease, or mineral buildup within the existing unit. If cleaning doesn't resolve the drainage issue, or if the air gap body itself is cracked, leaking, severely corroded, or damaged beyond repair, then replacement is the necessary next step. A damaged body won't hold a seal even after cleaning.
Remove the Old Air Gap — Clean the Air Gap Internals
Part of project
How to Clean or Replace a Dishwasher Air Gap · Step 3 of 9
In this video
From the top of the sink, unscrew the decorative cap and the large plastic nut holding the air gap in place. Pull the old air gap assembly down from under the sink. Place a bucket underneath to catch any water. Use a screwdriver to loosen the two hose clamps securing the dishwasher and garbage disposal hoses. Wiggle and pull both hoses off the old air gap nipples to completely remove it.
Goal: Disconnect and remove the old air gap assembly
- Be prepared for some water to spill from the hoses when they are disconnected.
Used in this video
- Screwdriver (brand: HDX, Screwdriver_Type: Flathead) — Loosening and tightening the hose clamps
- Bucket · optional — Catching residual water from the drain hoses
Frequently Asked Questions
How can I tell if my dishwasher drainage problem is definitely caused by a clogged air gap?
Look for standing water in the bottom of your dishwasher, slow draining, or water backing up into your sink when the dishwasher attempts to drain. A visual check of the air gap cap for visible debris or a gurgling sound during the drain cycle can also indicate a clog. Sometimes, water might even spray from the air gap cap.
What are the most important safety precautions I should take before starting this project?
Always turn off the power to your dishwasher at the circuit breaker and shut off the hot water supply valve located under the sink before beginning any work. Have towels ready to absorb any spilled water, and consider wearing gloves to protect your hands from grime and potential sharp edges. Never work with electrical components or water without cutting power first.
The project lists several tools; which are absolutely essential if I'm on a tight budget or a beginner?
For cleaning, you'll primarily need a Phillips head screwdriver to remove the air gap cap and a small brush or pipe cleaner for clearing debris. If replacing, you'll also definitely need soft-jaw pliers for hose clamps, a bucket for catching water, and the new air gap unit itself. Many items like the UV flashlight or specific brand towels are optional comforts rather than strict necessities.
When should I attempt to clean the air gap versus opting for a full replacement?
Start with cleaning if you suspect a blockage from food debris, grease, or mineral buildup within the existing unit. If cleaning doesn't resolve the drainage issue, or if the air gap body itself is cracked, leaking, severely corroded, or damaged beyond repair, then replacement is the necessary next step. A damaged body won't hold a seal even after cleaning.