Thread size and type inside the triclamp ferrule Sanke keg?

[Mchophead]

I just picked up a used keg.


Does anyone know what type and size of threads these are?

 

[tigmaster]

I just picked up a used keg.


Does anyone know what type and size of threads these are?

I do believe that's a European keg. No American kegs have that. The stem screens into the opening as opposed to the American kegs which has a snap ring