Low Level Float Switch for the Blichmann Boil Coil.
This float switch is designed by Blichmann to work with their boil coils. This safety device once installed properly will prevent you from ever running the boil coil dry. If the liquid level gets to low in your boilermaker kettle the switch will trigger and cut off the power to the boil coil.
This is a recommended safety feature for any boil coil user.