Automate Refilling Your ATO Reservoir Dual Sensors: Enhanced Protection Against Overfilling and TDS Creep User-Friendly: Touch Controller with Failsafe Quick Security Technology Compact: Suitable for All Tank Sizes with Magnetic Mount Sensors Reliable: High-Quality, Durable Components for Lasting Use The Smart ATO RO is a reliable device designed to automatically fill your RO/DI water reservoir. When the water level drops to the low-level sensor, it will open the solenoid and allow your RO system to refill the reservoir up to the high-level sensor. This system helps you avoid TDS creep in the reservoir, ensuring you always have clean RO/DI water for your aquariums, without the worry of forgetting to turn off your RO/DI system and risking catastrophic floods. Specifications Power Input: 100-240 VAC 50-60 Hz Power: 4.5 W @ DC 12 V Power Cord Length: 6 ft (180 cm) Length of Cable between Sensor and Controller: 6 ft (180 cm) RO Solenoid Valve: Power: 6W @ 12 VDC Pressure: 0.02-0.7MPA Port: 1/4-inch RO Tubing Connection RO Solenoid Valve Cord Length: 4 feet (120 cm) Max. Mounting Thickness: Sensor: 1/2 inch (12.7 mm) Universal Holder: 3/4 inch (19 mm) 1/4" RO Tubing: Length: 9.8ft (300 cm) What's Included? Smart ATO RO Controller Universal Power Adapter RO Solenoid Valve Float Valve Kit 1/4" RO Tubing (9.8ft)