About This Designed for RO/DI Systems:Fzone solenoid Auto top off system directly link to home RO/DI systems, this ensures purified water is added to the aquarium,minimizing harmful substances Compact Design: The ATO Sensor is only 0.7inches Suitable for rimmed, rimless and sump tank setups, providing a flexible solution for maintaining stable water levels across different aquarium types. Dual High-Precision Optical Sensors: FZONE Auto top off system with dual optical sensors ensures precise water level control and overflow protection with primary and backup triggers. Safety: The ATO system utilizes the QST3.0 and AFT Technology for enhanced reliability. AFT tech accurately differentiates between temporary and actual water level changes,ensuring stable performance. Two-year warranty: The kit comes with sensors, solenoid valve, power supply,and PU tubing.Enjoy a 2-year warranty, free replacements, and dedicated support for your peace of mind. Overview Brand : FZONE Color : Blue Material : Polypropylene (PP) Style : Convenient Power Source : AC Item Weight : 0.44 Kilograms Number of Packs : 1 Manufacturer : FZONE Number of Items : 1 Unit Count : 1.0 Count