Xp Aqua

Duetto2 Dual-Sensor Complete Aquarium ATO System

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$139.99 $139.99

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Tiny, Reliable and Long-lasting Auto Top Off System

  • *NEW Controller programming & circuitry for added system protection
  • *NEW Improved sensor design for longer durability
  • World’s smallest dual-sensor ATO
  • Two layers overfill protection
  • Intelligent QST programming
  • Secondary optical sensor
  • Super precise water level control
  • Super easy installation; plug-and-play
  • No programming or adjustments required
  • Works in complete darkness

With huge features jammed in a tiny package, the Duetto2 is the perfect ATO for your aquarium. XPAqua’s proprietary dual-optical sensor packs two precise level sensors in one incredibly small package, which has been redesigned for even better lifespan and durability! In addition to keeping your water level constant, the two sensors also work in concert with the updated controller's intelligent QST programming to help prevent overfilling.

All the installation parts are included and a magnetic coupling allows you to easily mount or adjust the dual-sensor. Installation takes just seconds so you can spend less time working on your aquarium and spend more time enjoying your aquarium.



ATO DC Pump Max Head - 8.2 ft

ATO DC Pump Flow Rate - 74 gph

Controller Dimensions - 2.2" H x .88" W x 1.9" L

Sensor Cable Length - 10 feet

Pump Cable Length - 69 inches

Max Tank Mounting Thickness: 1/2"

Power Supply Cable Length: 67 inches

Tubing ID: 6.5mm

Tubing OD: 9.0mm


What's Included?

1x Duetto Optical Controller

1x Power Supply

1x Water Pump

1x Siphon Break

7ft 6.5 mm ID / 9.0 mm OD Water Tubing

More Information
UPC 4714041212402
Dimensions 2.2" H x .88" W x 1.9" L (Controller)
Max Tank Thickness 1/2 in.
Included Mounting Magnetic
Control Type Preset Plug & Play (No Controls)
Pump Included Yes
Pump Model XP Aqua ATO DC Pump
Flow Rate 74 gph
Tubing Inside Diameter 1/4 in. (0.25" / 6.35mm)
Power Type DC
Power Cord Length 5 Feet
Water Level Detection Optical Sensor
Alarms Audible, Visual
Safety Features Overflow Timer, Includes Anti-Siphon Valve
Max Head Height 5 -10 Feet
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Product Questions

Does this unit have run time protection in the event that the sensor fails and after "X" seconds the pump shuts off until restarted?
Question by: Connor on Apr 18, 2023, 10:50 AM
Yes. The Duetto2, as with the Duetto, does have the QST Alarm. The QST Alarm shuts down the ATO and sounds an alarm if filling takes 6 times the amount of time than when it is plugged in. As an example, if it takes 10 seconds to fill the tank the first time, the QST Alarm will kick in if filling takes more than 60 seconds. This timer is reset whenever the ATO is unplugged and plugged back in.
Answer by: Alexander Reinartz (BRS Staff) on May 11, 2023, 5:36 PM
Does the sensor need to be placed on clear glass? Looking for something to put in the back chamber of an Innovative Marine AIO
Question by: jared dhondt on Mar 22, 2023, 3:53 PM
Thanks for the question! This sensor is entirely inside the tank, so it can work on painted glass or non-clear installations like the back chambers of AIO tanks like the Innovative Marine or Waterbox.
Answer by: Kyle Thomas (BRS Staff) on May 3, 2023, 11:04 AM