Electric Float Switch allows single point detection of coolant high/low levels through a side wall of a tank using normally open or normally closed contacts. 30 Watt rated switch can be wired into a OEM Low Coolant Level circuit or used as a switch for an aftermarket coolant level light. Includes a 1/2 IN NPT aluminum bung so that the level sensor option can be added by drilling and welding the bung to your aluminum coolant tank.