The Tomlinson RO Faucet comes in 9 finishes for a better match for today's designer kitchen. These lead-free faucet fits to most brands and makes a great upgrade from the basic faucet that come with most RO systems. Additional Details ------------------------------ Bullet point: Air Gap: An air gap faucet which contains an empty space built in the base of the faucet. Air-gap faucets have three lines attached to them. (1) line from the tank to the faucet (2) a water line from the brine water side of your RO. (3) a drain line for the brine water that attaches to the drain saddle. Please check your local code to determine if an air-gap is required.