What adapter is this.?

[Willthishelp?]

Who knows the kind of adapter this is and where to get in Europe

 

[アホペンギン]

What adapter.. the image isn't loading..

Edit: ok I see it now its an adapter for whatever inert gas tank the person who took this picture used, I don't know. Each inert gas tank has its own adapter, varying for different countries. I don't know which country this picture was taken in so I don't know.

 

[Tangerines]

Looks like a Cressi Compact MC9 Regulator. Then again, I'm not sure.
(This thing.)

 

[ipmanwc0]

that picture is of "diving cylinder G 5/8" internal thread – nitrogen W24 internal thread" scuba thread. it's available in the EU