Jandy Pro Series K2100CKC Levolor Low Lev with Slip Sensor 100' and 1" Valve 110/220V detects low-water conditions and turns off a pump or light to protect equipment until water is replaced. The Levolor® K-2100 can be used in any situation where a consistent water level is desired. After low-water conditions are detected, the K-2100 turns off a pump or light to protect equipment until optimum water levels are met. The K-2100 is an ideal device for fountains and ponds. Levolor electronic water levelers take away the worry of lost water in your pool, spa or water feature. The electronic fill device employs sophisticated electronics that carefully monitor water levels. The device compensates for waves, and its exclusive lock-out feature will not overfill the pool. With no moving parts to break or rust, Levolor ensures a reliable flow of water.