Filing tube is referred to the entry path of gasoline coming from an external source to the petrol tank. The piece has two key tasks:

  • Conducting gasoline towards the petrol tank
  • Exhausting air in petrol tank during refueling

Two safety and environmental features are always considered in the design and production of this set. In the world, three technologies are used for the production of punch shank:

  • Air inject punch shank
  • metal punch shank
  • corrugator punch shank

Why is the use of metal punch shank in the design and production of present vehicles has become obsolete?

  1. High price
  2. High possibility of leakage
  3. Metal corrosion in environmental conditions
  4. Greater weight than polymer specimens, resulting in increased fuel consumption and CO2 emissions to the environment
  5. Low flexibility and high vulnerability in accidents