N/A Hammerli AR20 fill adapter?

You should be able to screw the fill fitting into the adapter that allows you to use a foster QD, then attach that to your cylinder to fill.
It should look something like this part

There are different length adapters depending on if you are using a DIN 200 or 300 fill fitting.
 
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You should be able to screw the fill fitting into the adapter that allows you to use a foster QD, then attach that to your cylinder to fill.
It should look something like this part

There are different length adapters depending on if you are using a DIN 200 or 300 fill fitting.
Thanks for the photo! Now I get it. Charles