What kind of adapter is this???????????

[Agro]

One side (last pic) is air G5/8.
But what the hell is the other side? I find an o-ring inside.
I can not screw out the inner part, using a hexagonal tool. It seems to be fixed very well.
Inner diameter is about 20 mm.
It does not fit to any of my cylinders and I find no such adapter in the internet. Strange.....
Thanks for your help.

 

[ScubaJCBS]

Looks like scba

 

[happy-diver]

Looks like Atlantis

 

[Agro]

What is SCBA?
What is Atlantis?
I live in Europe, perhaps these adapters have other names here. Google did not help....

 

[Vicko]

SCBA is Self Contained Breathing Aparatus, used by fireman usually but to me it dosn't look like scba, more like a part from the male regulator side got stuck in a female SCBA valve.

 

[Agro]

I got out the inner part, looks original, no dammage. And now that the inner part is away, the adapter fits on a He 200 bar valve W 21,80 × 1/14" thread.
It seems this is a He adapter and the inner part should fit into the valve and seal there by o-ring. But in my case it does not, the valve's whole is to small. Strange.

 

[Wibble]

Looks like a 5/8ths to M26 female to female adapter.

Scuba Diving Adaptors - DIN, De-Canting, Charging, NEVOC might have something like it - or have others which may give you a clue.

 

[jale]

Hi
I found out that He and oxy size is not the same across the different European countries.
For example, Italian oxy fits French He (or something like that...i don't remember )

 

[Agro]

Looks like a 5/8ths to M26 female to female adapter.

Definitely no. M26x2 has inside diameter of 24mm, not 20mm. And M26x2 does not have this o-ring-pin.

 

[greeniguana]

Looks like a paintball or PCP rifle doodad.