One of the most conspicuous and annoying changes that was made to the plumbing code was the requirement for hideous dishwasher air gap. Subscribe.

Air gaps are required for plumbing code compliance in most but not all jurisdictions. ... the next thing to do is to run a plumber's snake down the drain to clear any obstructions in the drain line.

What Is the Thing Next to My Faucet? The air gap isn’t part of your faucet, it’s part of the sink drain. Specifically, it’s part of the dishwasher drainage system.