1/4" Auto Shut Off Valve
1/4" Automatic shut off valves are used with float valves or pressurized tanks to shut off an RO system. It utilizes the back pressure created by the float valve or pressurized tank to shut off the water supply to the membrane. Without an automatic shut off valve waste water would continue to run out after the float valve is activated or tank becomes full.
Here are installation instructions: https://www.bulkreefsupply.com/content/post/Installing-an-auto-shut-off-valve
I have included the link below for the tube clips to hold in the tubing. these are sold individually in 1/4" and 1/2" sizes. Feel free to let us know if you have any further questions.
There isn't much to go wrong with an auto shut off valve so it doesn't happen very often. Normal auto shut offs work by turning off the supply water when the product water line builds up enough pressure. If its not turning off, its usually because the product water line isn't building up enough pressure so its a matter of finding out why. The most common reason is just that the filters have become clogged and the unit just can't built up the pressure effectively, but its also worth checking and making sure that you don't have a small leak anywhere on the product line or something to that effect as well :-)