The Neptune Systems Automatic Top-Off Kit v2 is a simple, standalone, and complete solution for replacing water lost due to evaporation. The new aquarium hobbyist faces many challenges, but none is more annoying than the chore of having to add water every day to compensate for evaporation loss. This alone often makes the automatic top-off device (ATO) the first piece of automation equipment purchased.

The Automatic Top-Off Kit is not only designed to be super easy to install but is unique in the market as an ATO device with three layers of redundant monitoring and water level control. The ATK does the work for you while simultaneously protecting your tank.

• Plug and play ready. No mounts to assemble. No bare wires to attach.
• 3 Levels of Safety Protection!
• Two optical water-level sensors (one for water level and one for emergency back up)
• IQ-Fill water run-time intelligence – learns how much water you use at each top-off
• Mechanical float valve prevents water overrun if electronics should ever fail
• Does NOT rely on ANY fault-prone mechanical float switches, temperature sensors, or capacitive sensors!
• Works Standalone (NO APEX NECESSARY!)
• Advanced features are unlocked when connected to an Apex (i.e. remote failure notification via text, email, or iOS alert)
• Includes PMUP, a powerful 24VDC pump that can push water vertically up to 14’
• Audible failure alarm
• Additional features with optional accessories