The Best Kitchen Sink With Air Gap References. A dishwasher air gap is a cylinder fitting that connects the kitchen sink drain to your dishwasher, preventing dirty water from flowing. A kitchen air gap is a device that is installed on the sink or dishwasher to prevent contaminated water from flowing back into the drinking water.

Get your new air gap: A dishwasher air gap is a cylinder fitting that connects the kitchen sink drain to your dishwasher, preventing dirty water from flowing. 39k views 2 years ago.