AquaticLife Auto Shut-Off Float Valve, 1/4-Inch AquaticLife Auto Shut-Off Float Valve Kit for RO and RO/DI units will allow your reverse osmosis system to automatically turn on and off based on the activation of a float valve. This auto-fill float valve kit allows you to fill large tanks, containers, and aquariums automatically. Float valves are simple to install and can save a lot of water. The water fill float valve connects directly to faucets. The adjustable float is threaded with a ½" MPT connection and attaches to any standard reverse osmosis system that uses 1/4" tubing using the included ½” FPT to Press-Fit adapter. If you're using this kit with a reverse osmosis or RO/DI system, you WILL NOT need any other components. This RO float valve kit includes the necessary RO auto shut-off valve, check valve and tubing. Minimum Operating Pressure: 40 PSI. Maximum Operating Pressure: 80 PSI. Unsurpassed Quality And Satisfaction AquaticLife manufactures premium-quality products. Every product that goes out the door meets our highest quality and standards.