Don't contaminate your clean dishes. Waterstone Traditional Single 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. Classic design matches all Annapolis, Hampton and Towson traditional faucet Suites. Cover is made from solid brass and available in 32 finishes. American made and comes with a lifetime functional warranty.