This sensor is simply clamped over your 6mm overflow hose in side the model.
In connection with the fuel station, it stops the refueling process when the tank is full.
Technical specifications:
Dimension.............. 30 x 30 x 11 mm
Voltage............... 5 Volt
Weight................ 11g (incl. cable and sensor)
80cm MR30 Extension Required to go with the Fuel Switch