What Is the Purpose of an Air Gap

今注目を集めている What Is the Purpose of an Air Gapについて、多角的な視点をご紹介しています。

Here’s the kicker: most people think “more barriers” is better. But water pressure can overcome rubber seals and check valves. Air is the one thing it can’t push through.

Dishwasher Air Gap - Inspection Gallery - InterNACHI®

Check valves are great, but they’re mechanical—they can jam or fail. An air gap is a physical impossibility for backflow. It’s like comparing a lock to a brick wall.

So when your plumber insists on that ugly little chrome cap, don’t roll your eyes. Give it a little salute. It’s the silent guardian of your drinking water.

What if You Don’t Have One?

This is the scary part. Many older homes have no air gap on their dishwasher—they rely only on a check valve inside the appliance. You’re one clogged sink away from a biology lesson.

Check your local code; many areas now require visible air gaps for new installations. If yours is missing, a simple retrofit kit costs less than your next pizza night. Worth it.

Just don’t mistake a “high loop” (a looped drain hose) for a real air gap. It’s better than nothing, but not foolproof. Air wins again.