Easy to Install. Fill 'er Up! No Moving Parts - No Floats - Now with PosiFill technology! Patented Sensing Technology Adds Power to your fill. Compact Design - Easily Hidden from View Use for Ponds, Water Features, Fountains, Watering Troughs and More Made in the USA The Level Waters(tm) MC-01B EasyFill(tm) Sensing Unit provides dependable automatic water level sensing at a fraction of the cost of professional systems. Smaller and more reliable than float valves, the MC-01B does not need to be mounted where the water feed is located. Requires a 24VAC power supply and valve for operation. Complete systems are available as the MLS-3401 and MLS-1002 EasyFill. No need to constantly clean out mechanisms like with float valves. Electronic fill systems are the modern filling solution- try one today. For professional features, check out the new MCX-11 control sensor.