They do a lot (perhaps all U.S.) metric bottle testing.
They stamped the bottle and provide a certificate that
it passed test. I don't know if they removed the valve
and/or cleaned the inside. Give them a call and ask
if it matters to you. As explained before the lack
of a DOT stamp has not been a problem for me and I
have used several different filling stations. All metric
bottles obviously have never had DOT stamps and there
are many still in use.
As Tim pointed out metric bottles also do not have
a safety rupture disc installed in the valve, which
is to protect against significant over pressurization,
such as could be caused by fire.
If either is an issue for you a new bottle is the only
choice or only fly low.




At 19:43 08 September 2005,
wrote:
Gary: Did TYM's put a new date stamp on the bottle
when they tested it
? Also, what work did they do on the bottle? ie,
remove the
valve,sand blast the inside, test and reinstall the
valve ? or just
put a pressure test thru your valve without removing
it? The reason I
ask is I got the Salt Lake City test site to test one
of my bottles 2
years ago and the didn't realise that the thread was
metric and when
they put their automatic pressure tester on and it
auto-screwed up the
joint it stripped my bottle threads !