Tim: I'm glad I posted this item so I could see all these comments.
You are right of course that just finding someone to test it isn't the
answer because without the DOT stamp an alert O2 station shouldn't fill
it. I can't understand why the USA and Germany couldn't have agreed
that for EXPERIMENTAL gliders the German bottle was exempt. Mine are
certified to 2900psi and we only fill generally to 1800psi. What is
the circumference of your "small" diameter bottles? and how long are
they? Capacity ? Cost ?