Neptune Systems ATK Auto Top Off Unit Kit


The safest standalone ATO on the market!

The Neptune ATK System comes with everything you will need to get an automatic top off system up and running within minutes. The ATK can be used on its own without the necessity of an Apex Controller, but if you have an Apex, the ATK will integrate seamlessly into your system and give you bonus features.

  • Dual Optical Sensors
  • Float Valve
  • Includes PMUP and Tubing
  • Strong Magnetic Bracket
  • Multiple Levels of Safety
  • Compatible with any Apex

The Neptune ATK can be used on its own, or in conjunction with any Apex Controller. Neptune's Auto Top Off Kit comes with everything you will need to have a functional and safe ATO system. The FMM module is the brain of the operation and has an indicating LED light along with an audible tone letting you know when anything goes wrong. 

Dual Optical Sensors

Optical sensors are used by most of the top rated ATO systems, and the ATK uses two optical level sensors that control the overall function of the system. The sensors are pre-mounted into the magnetic bracket, with the lower optic being the primary water level sensor, and the higher optic acting as a backup sensor that will turn the ATK system off if necessary.

Adjustable Float Valve

Each ATK comes with a 100% reef safe adjustable float valve that acts as the last line of defense against overfilling. Float valves are very reliable and if water ever rises to activate the valve, the flow of water will be physically shut off saving you from a possible flood. 

Smart Algorithms

Don't think Neptune just stopped at sensors, and float valves to keep your floors dry and your tanks water level perfect. They included an algorithm that will monitor and learn how long it takes to fill your tank on average. After that is determined the system will never run for more than twice the time required to fill the tank. For example, if your tank typically takes 10 seconds to fill, the ATK will never run for more than 20 seconds, and if your system takes a minute to fill, it will never run for longer than 2 minutes. 

PMUP Utility Pump

Each ATK includes the powerful PMUP that connects directly to the FMM module without the need for an additional power supply. The submersible PMUP fits is a variety of top off reservoirs and uses standard 1/4" OD Tubing (RO Tubing).

Neptune ATO Specifications:

  • Module Dimensions - 4.75" L x 2.75" W x 1.375" H
  • Mounting Bracket Dimensions - 6.5" L x 3" x 3.5" (loaded with sensors and float valve)
  • Pump Dimensions - 2.25" OD x 5.5" H
  • Max Tank Thickness - 1/2" (glass or acrylic)
  • Max Flow - 100GPH
  • Max Head Height - 14'
  • Tubing OD - 1/4"
  • Power Consumption - 17W

What's In the Box

1x FMM Module
1x Power Supply
1x PMUP Pump
1x Pump to Tubing Adapter
1x Siphon Break Fitting
1x Magnetic Mounting Bracket
1x Adjustable Float Valve
2x Optical Sensing Eyes
1x 3' Aquabus Connection
13' Top Off Tubing