The method we use to produce the large-diameter aluminum seamless tube for hydrogen fuel vehicles is designed for the most reliable results. It is different from the usual direct extrusion where the work billet is pushed towards the ram. We instead produce the seamless tubes through indirect extrusion. This process is also called reverse or backward extrusion. It entails the ram moving towards the stationary billet. Since our billets are of the highest quality, the chances of getting defective extrusions are minimal. The process reduces the friction during extrusion and therefore the possibility of the product cracking is reduced, and this guarantees excellent seamless tubes for hydrogen fuel vehicles.