Float Switch, Vertical - 

The RSF50 series compact vertical Float Switch with a single switch point. Mounting is either from the top or bottom of a tank from the inside, so requires access to the inside of the tank. These can be manufactured in a variety of plastics, with a choice of gasket materials, to suit most commonly used liquids. The switch action may be reversed by removing the float, inverting it, then refitting to the stem.