Radium Fuel Fill Neck Hose Kit, 1.5in, ClearRadium Fuel Fill Neck Hose Kit 1. 5in, Clear The Radium Engineering Clear Fuel Fill Neck Hose Kit is ideal for applications where visual confirmation of fuel flow during filling is required. The transparent construction allows you to see fuel dynamically filling in real time a practical advantage in motorsport and track day environments where precise fuel management matters. Note: Depending on the fuel type used, the clear hose may become cloudy or