Don't contaminate your clean dishes. Waterstone Contemporary 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. Modern design matches Fulton, Hunley and Parche contemporary faucet Suites. Cover is solid brass or stainless steel construction. Made in the USA and comes with a lifetime functional warranty.