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It has a hand operated, spring loaded lever to keep the faucet closed and to prevent waste. You can keep the faucet open by pushing upward on the lever and locking it against the spout. To meet plumbing codes, an air-gap is built into the faucet drain water tubes. The air-gap prevents a back siphon of drain water. MONITOR -When the faucet is opened, lights on the faucet base show how the RO system is working. • FLASHING GREEN -The RO system is giving you high quality product water. NOTE: The gre