Suiatable for use with 1/4'' (6.35 mm) reverse osmosis water filter tube.

The Reverse Osmosis Systems Four-Way Valve is ideal for controlling the flow of water from a water filter, where you want the water to turn off when the tank is full.

This accessory is absolutely necessary in all reverse osmosis systems. It has an internal "drun" which swells as soon as the reverse osmosis water tank is filled. Essentially this component commands the reverse osmosis to stop working as soon as the water tank is completely full. Without this accessory, the reverse osmosis would into the drain. If you notice that your reverse osmosis system is still working while your tank is full, then this component is the first and needs to be replaced.