Don't contaminate your clean dishes. Waterstone Industrial Single Port Air Gap prevents dirty drain water from the dishwasher from backing up into the water supply or RO system. 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 knurling design matches all Industrial PLP Pulldown Faucet Suites. Cover is made from eco-friendly solid brass or stainless steel construction. Made in the USA and comes with a lifetime functional warranty.