A dishwasher air gap is an egg-sized device that gets mounted above the sink to help prevent contaminated water from draining back into the dishwasher...
Because these air gaps are a fairly new requirement, we've come across a lot of air gap devices that aren't installed properly. To understand these defects, it's helpful to understand how these devices function... [diagram and discussion at the link]
Plumbers don't like them, inspectors don't like them, and homeowners hate them... Oh, and for the record, dishwasher air gaps are definitely not something that we recommend installing during our home inspections.
Excerpted from Reuben Saltzman's incomparable
The Home Inspector blog.
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