that is rated 4 stars at the moment because it's cheap and seems to be working as intended, although I just installed it yesterday . My Watts Pure H20 system has been running non-stop for months and I have noticed that my water bill has increased significantly. It turns out that the automatic shut-off valve, which cracked during installation, is an important part of the system (I worked without it). The installation instructions that came with this valve are useless. After a long search on the internet I think I figured out how to install it on my system. At the top of the unit is the high pressure side, labeled "Inlet" and "Outlet". The opposite side with screws is the low pressure side. Connect the green water supply line to the "In” port on the high side and the green line to the reverse osmosis system to the "Out” port on that side. Then connect the blue line from the water storage tank to the "outlet" port on the low pressure side and the blue line from the tank to the reverse osmosis system to the "inlet" port. This configuration seems to work as the gurgling noise stopped after the tank was pressurized.
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