The flexible throttle body arm is designed to attach to any of the EG gasoline or diesel induction nozzles to precisely position them in the fresh air induction entrance during an induction cleaning service.  Various nozzle options can be interchanged, depending on the type of induction service being performed.  Flexible Throttle Body Arm for: FST16 and FST24 Fuel Service Tools. Diesel Service Tools EGR64.