There are 2 shut off valves. Just one is close to the chilly water line heading up to your cold and hot kitchen area faucet. It really is at stake feeding the RO program. The 2nd one is found on top of the metallic tank. On the internet copyright supervisor: http://www.virginianewsdesk.com/news/story/498656/advanced-water-rebrands-to-keep-up-with-changing-office-culture-and-cleaner-hydration-needs.html