4 Way Shut Off Pressure Switch 1/4'' For RO Unit System Aquarium Part

4 Way Shut Off Pressure Switch 1/4'' For RO Unit System Aquarium Part automatically shuts off the water from the reverse osmosis system when the tank is full. Simply push your 1/4" water pipe into the holes on the valve to make the connection. Valve works off pressure to detect when the tank is full and turns off the water to help prevent constant running of the waste water from the ro system.