The 12/24V digital bilge switch activates your bilgepump automatically when water exceeds the acceptable level and deactivate when water has been removed. Including mounted T-Slot clip for easy assembly with pumps equipped with universal T-Slot pin. For a fully automatic removal of your bilge water connect a switch to your electrical bilge pump. Field sensing digital technology, fully sealed without any moving parts. Will not corrode and are not affected by severe movements, oil or debris.