What is a Dishwasher Air Gap? A dishwasher air gap is a device that helps protect your dishwasher from contaminated water. Many dishwashers don’t have built-in backflow prevention. Backflow happens when dirty, contaminated water is mixed into the clean water supply. Why is this important? Backflow can lead to contamination inside your dishwasher and create an environment … [Read more...] about What is a Dishwasher Air Gap and Are They Necessary?