Overview

Simplify your reefkeeping routine with the Neptune Systems ATK (Auto Top Off Kit), a complete, plug-and-play solution for replacing evaporated aquarium water. Designed to work as a standalone ATO system or integrate seamlessly with your Apex Controller, the ATK combines advanced automation with multiple layers of safety. Featuring two solid-state optical sensors, a mechanical float valve, intelligent water run-time monitoring, and audible alarms, the ATK ensures safe, reliable top-offs without the daily hassle.

Key Features

• Standalone or Apex-Ready – Works right out of the box without an Apex; unlock advanced features when paired with one.

• Multiple Layers of Safety – Includes dual optical sensors, a mechanical float valve, and IQ-Fill water run-time protection.

• Powerful Pump Included – PMUP v2 utility pump moves water up to 14 feet vertically, perfect for remote or basement reservoirs.

• Smart Design – Vertical pump orientation with removable intake screen for easy cleaning and maintenance.

• Audible Alarms – Alerts you if sensors detect overfilling or prolonged pump run times.

• Expandable – FMM module includes two additional ports for adding leak detectors, flow sensors, or more optical sensors.

Safety Features

• Backup Optical Sensor – Stops pump and sounds alarm if primary sensor fails.

• IQ-Fill (Standalone Mode) – Limits fill amount to prevent overfilling in case of failure.

• Mechanical Float Valve – Final fail-safe stops water physically if electronic sensors fail.

Product Specifications

• Pump Type: PMUP v2 Multi-Purpose Utility Pump

• Pump Capacity: Up to 100 GPH / 14 ft. head height

• Sensors: Two solid-state optical water level sensors

• Float Valve: Mechanical fail-safe shutoff

• Power Supply: 24V 36W included

• Tubing: 4 meters orange RO tubing (3/8" and 1/4" fittings included)

• Module: FMM Fluid Monitoring Module with 4 sensor ports

What’s Included

• FMM Fluid Monitoring Module

• (2) Optical Water Level Sensors

• Mechanical Float Valve

• 90° Tube Fitting

• PMUP v2 ATO Pump

• 4 Meters Orange RO Tubing

• 3/8" to 1/4" Push Connect Adapter Fitting

• 1/4" Push Connect Siphon Break

• Set Screw (for non-float valve applications)

• 24V 36W Power Supply