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Where is an air gap required?

wattersplumbing.com - Everything You Need To Know About Plumbing Air Gaps

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Updated: November 2022

In the plumbing industry, air gaps are an essential design element to understand! The experts at Watters Plumbing are here to help you learn more about air gaps, what they are, why they are important, and what you should look for.

What is an air gap and why is it important?

Plumbing codes call for an air gap between portable water and a drain. This gap is usually about the distance between the faucet and the top of the sink or bathtub (one inch or more). Basically, the air gap is there to prevent accidental backflow. If contaminated water backflows, it can cause serious health risks. Without the air gap, wastewater could siphon back into the drinking supply. This can happen when a city main is shut off, causing a drain-down of the system with plumbing done improperly. Sometimes it is a hose left in a mud puddle or maybe a hose lying in bleach water. People have died this way. Though rare, the plumbing code helps protect the general public from these dangers. Current improvements include antisiphon faucets for garden hoses, the air gap for the dishwasher, proper installation of water heater T&P relief drains, and backflow preventers for irrigation systems.

Air gaps in sinks

One of the most common air gaps you’ll see is in sinks, tubs, and faucets. Ever wondered why the faucet is so much higher than the sink rim? That gap ensures water can get from the outlet to the sink, but no contaminants can get back in the outlet/faucet — even if the sink overflows.

Air gaps in dishwashers

You’ll also see air gaps in your dishwasher installation. Dishwashers are generally hooked up to a pipe under a sink or through a garbage disposal. You’ll likely notice a small round cylinder mounted on the countertop by the faucet. The tubes inside the dishwasher are separated by a space, which creates an air gap. If you have more questions about air gaps or plumbing issues in your Fox Cities home, don’t hesitate to contact Watters Plumbing.

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