Dirtbike gasoline tank cap hose

I made this dirtbike tank cap for my friend to reduce gasoline leaking from the tank cap. It isin't a valve, but there are three small holes on top. It is also for aesthetics. You need a piece of 6mm inner diameter tube. It works best if the outer diameter Is max 10mm. Also keep in mind that you can scale the part up or down.

Let me know if there are any problems with the model. Add a rating if you like. Thanks!