I am a backflow tester in my state and when I install Reverse Osmosis systems, I specifically ask for a water faucet dispenser that has three attachments undersink: This dispenser is a dispenser with a built-in Air Gap.
Water Feed
Incoming barbed nipple from RO discharge
Outgoing barbed nipple for drain
It cost a little more for the dispenser, but solves the issue of possible cross-connection between potable and drainage…. 
» This message has been edited by DUNBAR on 03 January 2004
» This message has been edited by DUNBAR on 03 January 2004
