I just shot an email to this seller:
Scuba Tank - Steel 100 CF - High Pressure, Boot, Net, Cap
I figured I can look at it up close. Hopefully I can just use an adapter for the time being until I can convert over to DIN. And yes this is a 3442 psi tank. I know I've seen some that go to well over 4000 (I want to say 4750), so I can clearly understand the need for going DIN only at those pressures.
As tobin mentioned above. I should have said if you have a 200 bar din. if so, you can use the adapter. It will not work on a 300 bar din tank valve.
sorry