ATK V2 ATO System by Neptune Systems
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Precision Meets Peace of Mind with the Neptune Systems ATK V2 ATO
The Neptune Systems ATK V2 ATO offers a smart and dependable solution for maintaining aquarium water levels. Designed for both new builds and upgrades, this Aquarium ATO System replaces evaporated water automatically and precisely—without the guesswork. With integrated safety features and optical sensors, this Neptune Systems kit brings robust reliability to your reef or freshwater setup. Explore more control tools like this under our Automate & Monitor collection from Neptune Systems.
Why the ATK V2 Stands Out in ATOs and System Gear
Engineered to protect your tank from overfilling, the ATK V2 uses a combination of optical sensors, IQ-Fill logic, and a mechanical float valve to deliver layered security. Whether you're setting up your first ATO or replacing a failing top-off system, this kit blends seamlessly into your workflow. It’s featured in our ATO's and System tools sections for aquarists focused on precision automation.
Key Features of the Neptune Systems ATK V2 ATO
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Automatic Top-Off Precision: Replaces evaporated water without manual intervention.
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Redundant Safeguards: Includes dual optical sensors, smart runtime limits, and a physical float valve.
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Simple Setup: No Apex required; plug-and-play out of the box.
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Smart Monitoring Module (FMM): Reads water levels and integrates with other Neptune accessories.
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Expandable Design: Two open ports allow integration with leak detectors, flow sensors, and more.
What’s Included in the Kit?
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1x FMM (Fluid Monitoring Module)
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2x Optical Water Level Sensors
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1x Mechanical Float Valve
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1x PMUPv2 Submersible Pump
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90° Tube Fitting + 4 Meters RO Tubing
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1x Push Connect Siphon Break
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1x 3/8" to 1/4" Adapter Fitting
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1x Mounting Hardware + Set Screw
Advanced Multi-Layered Safety System
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Primary Sensor: Tracks precise water levels and controls refill timing.
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Backup Sensor: Acts as a failsafe, halting the pump if the first sensor fails.
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IQ-Fill™: Learns your tank's evaporation rate to prevent overfill.
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Float Valve: Physical backup to block overflow if both sensors malfunction.
Installation in Under 15 Minutes
The ATK V2 is engineered to be intuitive. It mounts quickly, calibrates automatically, and can be configured in stand-alone or Apex-linked setups. For aquarists who want a plug-and-play ATO solution, this kit is a time-saver.
Benefits at a Glance
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Reduces the chance of salinity swings from evaporation
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Compatible with most sump and all-in-one tank designs
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Adds fail-safe reliability to your tank’s water level management
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No Apex? No problem. Works independently or as part of a larger system.
Frequently Asked Questions About the Neptune Systems ATK V2 ATO
Q: Can I use the ATK V2 without owning an Apex system?
A: Yes, it’s fully functional as a standalone ATO. You’ll get all three safety layers without needing to connect to Apex.
Q: Does it require regular calibration?
A: No. The sensors are optical and self-regulating, requiring minimal upkeep.
Q: How long does it take to install?
A: Most aquarists have it running in 10–15 minutes. Just mount the sensors, plug in the pump, and you’re done.
Q: Will it work in small nano tanks?
A: Absolutely. The PMUPv2 pump is compact, making it ideal for tight spaces like AIO chambers.
Q: What kind of tubing is included?
A: The kit comes with 4 meters of orange RO tubing, plus push connect fittings for fast setup.
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