You have not got a seal between the bottom of your steyr adaptor and the bottom surface in the scuba valve...you need to space, or bridge this gap.
Okay, I'm slowly starting to understand what you kind folks are telling me.
I thought that was a pressure relief valve opening up on the scuba tank, but it's really just a vent hole? Now I get it.
But isn't it unusual/strange that with a 3400 psi (232 BAR) tank, the supplied adapter doesn't work and that I need a longer (300 BAR) adapter? I mean, my tanks are NOT 300 BAR tanks!
Looks like I'm dead in the water with this until I can get the proper adapter, and that's going to take at LEAST a week. SIGH
Can you give me a clue about what those "intermediate o-ring spacers" look like? Or that nylon spacer you're talking about? My only chance is that once I know what to look for, I might find something in a local hardware store that would work. Is the idea to fill in the space between the scuba DIN valve and the adapter? What you use doesn't need to be threaded? But it would have to make a good seal in that space, right? So that air doesn't escape around it to the vent hole?
Thank you all for your kind help!!
Right....Most 200 bar tanks come with a 200 bar valve, however sometimes they come with a 300 bar valve and I have owned two...where the threaded portion is deeper by about 3mm than the 200 bar.
I have included a picture of a fitting available at scuba shops that when it is machined to a shorter section and screwed into the scuba valve will allow the steyr adaptor to seal properly when finger tightened and prevent the air escaping out the vent hole.
However as I mentioned earlier you could use a 3mm thick nylon washer with about a 6 mm hole and place it into the scuba valve before screwing in the adaptor.
Even though it does not have o rings a little more tightening and it works fine without leaks.
In fact the scuba tank at our Club has a 300 bar valve and we had to find a way for 200 bar adaptors to be used.....you guessed it, the nylon washer works just fine and no more lost air out the vent.
p.s. If you use the optional scuba fitting you must machine to an appropriate thickness. You will lose the lower o ring, but it will screw in and seal perfectly with your adaptor.
Finally, the nylon washer works as well and is much easier.
Another bright spark used an automotive oil drain plug copper washer of the appropriate size and it also worked.....its up to you now dude.