As others have already mentioned:1. The valves eventually get stuck in the ON position. When this happens, the handles just flap back and forth, and water keeps flowing through the unit until you turn off the water supply to the unit.2. It is impossible to repair--no matter if you are a handy homeowner or a plumbing professional--so you are required to replace the whole dispenser assembly at a cost of $250-300.I have three of these units installed. All three of them have failed!BTW, my plumber doesn't normally deal with this crap brand, and his wholesaler can't get it for less than $300.I am replacing one of these units, but the other two that have failed are being permanently retired.