Hello!
Below is the type of fitting that you need to connect an Anton gas tank.
The pipe supply is a 2mm one. Brass or copper do the job.
Note:
never use an 0'ring on the burner itself. Generally it is a 5x50 mm or 6x75 mm type with a metallic cone => Metal against metal on the burner.
They are very easy to machine down if a friend can do it for you.
Put a pic of your tank, it will help !
Good luck!
Regards.