Again, the home inspector disagrees. To us, this is all a bunch of confusing terminology. Meanwhile, the people who are buying our home insist that the problem be corrected in an approved manner. How do we sort through all of this conflicting technical jargon? A. Your question covers a number of issues and misconceptions regarding dishwasher drain lines. Let's take them one at a time: • Most people have seen a dishwasher airgap. It appears as a small chrome cylinder, commonly found on the back rim of a kitchen sink. It is what plumbers call an anti-backflow device, because it prevents sewage from flowing back into the dishwasher.
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