This system comes complete with 1x on/off float switch connected to a plug adapter with built in really.  

The Auto Top Up system is a time and trouble saving unit that can be used for many different applications in a aquarium system where you need to be able to control or switch equipment on or off at different water levels. 

Ideal to use as a failsafe to turn of sump pump when water drops to a certain level to protect your pump and equipment. 

This unit will switch your auto top up pump on and off at your pre determined level to maintain a correct level by automatically topping up water lost by evaporation on both fresh and marine aquariums and sumps.  

Using a float switch to operate a pump allowing a set water level to be maintained, thus preventing the aquarium from running dry or overflowing.   

1x Float switches with Magnetic mount,  all prewired.

System is completely pre wired for ease of use.