Use it to Top off My 4 gal nano.
Simple to use. Just plug the tube with ball end into 1 gal Jiuce bottle filled with water & Close the cap.
Clamp the Water level sensor to the edge of the tank
Put 2 D battery in & turn the knob on
The water will pump out from the open tube when the water level is low & stop automatically
when water level raise the water bug floate.
The open tube need to be suspended & not submerged into the water, I use Valcro to suspend it over tank edge.
$25 Shipped In US.
