Don't contaminate your clean dishes. Waterstone Traditional Dual Port Air Gap prevents dirty drain water from the sink from backing up into the dishwasher. Not only is the air gap unit designed to stop brine water and reduce dirt in your kitchen pipes, but will look good in the process. Elegant design matches the Annapolis, Hampton and Towson traditional Suites. Includes air gap body and cover. American made and comes with a lifetime functional warranty.