Duetto2 ATO
Duetto2 ATO new
Model: DATO-202P
World’s Smallest Dual-Sensor Aquarium Auto Top Off


  • 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

Why Choose Duetto2 ATO ?

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. In addition to keeping your water level constant, the two sensors also work in concert with the 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.


Installation Diagram:

* Make sure all plugs are snug and all wiring have drip-loops for safety.
** Please avoid setting up the sensor in an area with micro bubbles or direct light.

Additional Images: