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> 
> Stopped in at the local welding/med gas shop to get my O2 tank refilled,
> and the new manager refused to fill a med O2 tank without a prescription.
> Not really a big problem - I can always find a prescription, and anyhow
> there's always welding O2, but it's a damned irritiation, and I'm curious
> if others have run aross this and how they deal with it.
> Just what is the legality of breathing O2 underwater? Flyers seem to buy it
> without difficulty, maybe we need a "Diver's Grade"....
> 

Steve,
  Aviation Grade oxygen is not regulated, that is why you don't need a
prescription. Aviation O2 has less moisture in it than Medical O2, yet
they all come out of the same vat as welding O2. The best thing to do
is find a supplier that handles the tanks the best. Find a gas
supplier that vacumes the cylinders before filling.

Barry
> 
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