XP Aqua Duetto Dual-Sensor Complete Aquarium Auto-Top-Off ATO System


World's smallest dual-sensor ATO

With huge features jammed in a tiny package, the Duetto is the perfect ATO for your aquarium. XP Aqua’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. 


  • World’s smallest dual-sensor ATO
  • Two layers overfill protection
  • QST (Quick Security Technology) provides real-time failsafe protection against failure
  • Secondary optical sensor
  • Super precise water level control
  • Super easy installation; plug-and-play
  • No programming or adjustments required
  • Audible and LED light alarm
  • Works in complete darkness


  • Model: DATO-200P
  • Power Input : 100~240VAC 50-60HZ
  • Cable Length of Power Adapter: 180 cm (6 ft)
  • DC Pump
    • Head : 8.2 ft (250cm)
    • Flow Rate : 74 gph (280 lph)
  • Max mounting thickness : 1/2" (12.7 mm)
  • Power : 4.5 W @ DC 12 V
  • Pump Cord Length : 6 ft (180 cm)
  • Length of Cable between Sensor and Controller : 180 cm (6 ft)

**Please avoid setting up the sensor in an area with micro bubbles or direct light. 


Similar Products

AutoAqua Smart ATO Micro - Automatic Top Off System

Ideal for small marine and freshwater aquariums

View Product

IceCap ATO Auto Top-Off

Safely keep water & salinity levels stable

View Product

IceCap Magnet Mount Float Valve

Comes with universal tubing retainer and tubing

View Product

Want to see more?

Browse our great selection of inventory!

See All Products