Dishwasher Countertop Air Gap. The air gap is there to prevent the water from being siphoned out of the dishwasher. Amazon's Choice for dishwasher air gap.
In plumbing, this point where wastewater could potentially pollute potable water is A dishwasher air gap must extend above the countertop and drain into the sink. If you don't have an air gap, at least loop the drain from the dishwasher as high as you can under the countertop before installing to a disposer or a trap. If you need to drill a new hole, please refer to the information on this page.
The device has two hose fittings on This eliminates any suction force that can draw water back into the dishwasher chamber.
Both the HIGH LOOP and AIR GAP methods prevent the drain water from your sink from routing into the bottom of your dishwasher when you drain your kitchen sink.
In this video, I'll explain what an air gap does and why you may need one. Drain Air Gap The drain air gap is usually located on top of the sink or countertop near the dishwasher. An air gap installed under the counter could flood your under-sink area.