Rule-A-Matic Plus Model 40A is a float switch for bilge pump, that senses water and activates the pump. Turns pump on when water level reaches 2" (51mm); turns pump off when water level reaches 3/4" (19mm).

Rule’s Float Switches offer outstanding performance. Extra-large float chambers are used for increased buoyancy and detachable mounting bases that make them easier to install and remove for cleaning and inspection.

Suitable for 12-24-32 Vdc.

ISO 8846 Marine (Ignition Protection)