Hose sizes: 4mm, 6mm and 8mm.
Voltage and thermostat controlled like the battery heater.
Intented for long fuel lines which have weak fuel flow in arctic conditions. Arctic Fuel Heater Junior is good especially when you need to heat up the fuel for the diesel used extra heater's (Webasto, Eberspächer, ardic, Mikuni ext.) fuel pumps. The warm fuel doesn't clot on the pump's filter.
Heats up the diesel fuel always automatically when the vehicle is running. Also when vehicle is standing by if the vehicle's battery is charging.
Turns on when temperature is + 4°C or colder.
Maintenance free, works automatically.