The Vari-Flot is a Diaphragm operated Float Valve used to prevent tank overflows. This new generation tank level controller automatically turns off the supply to the tank once it gets filled up and restarts supply as the water level drops. This is the most compact, long life float valve which makes the old ball cock Float Valve look obsolete.

As the water level rises above the base of the Vari-Flot the float rises up and activates the diaphragm which uses the water pressure itself to turn off the valve and stop inflow of water completely.