The CoralVue Hydros Triple Optical Auto Top-Off (ATO) Kit (HDRS-ATO-300) comes with everything you need to use your Hydros device (Control 2 or Control 4) as an ATO system. NOTE: You must have a Hydros Controller (Control 2 or Control 4) for this product.

The Hydros ATI Kit features a triple water level sensor for improved safety and is designed to easily maintain water levels in small aquariums or all-in-one tanks with minimal water fluctuation.

Why purchase a separate and expensive auto top-off system when Hydros can do the job for you? The Hydros Auto Top-Off Kit comes with everything you need to use your Hydros device (like the Control X2 or Control X4) as an ATO system. This kit features a triple water level sensor for added security. It is perfect for maintaining water levels in small aquariums or all-in-one tanks with low water fluctuation.

Includes:

• Hydros Triple Water Level Sensor (plugs into Hydros Sense Port)
• Hydros DC Micro Pump (plugs into Hydros Drive Port)
• Hang-On Tubing Mount
• 80" Tubing (8.5mm OD - 6.5mm ID)
• Siphon Break

Hydros Water Level Sensor: An Easy and Accurate Way to Monitor Your Water Level!
The Hydros Water Level Sensor contains no moving parts that can fail. It’s extremely tiny: it’s a little over a half-inch thick with a circumference the size of a US penny. The optical eye is magnetically coupled with the magnet side measuring only ¼” thick. It can be mounted to most clear, tinted, or painted surfaces up to ½” thick. The sensor operates in the daytime or complete darkness so it’s safe for use hidden inside your aquarium stand or in the back chambers of an all-in-one aquarium. The sensor is easy to place, easy to move, and easy to clean. The sensor connects with any Hydros Sense Port using an aviation-style plug for safe operation. No additional power source is needed to run the sensor.