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I hate to hurt the chances of the "pictures" thread going 100 in a row, but
that could still happen.

This post at DAN seems interesting.  Apparently aluminum is not the ideal
metal for HP O2 working parts.  (Granted there are a lot of medical O2
cylinders of Al out there.)

"Over the past five years the Food and Drug Administration has received 16
reports of
    aluminum regulators used with oxygen cylinders burning or exploding.
These incident caused
    severe burns to 11 healthcare workers and patients. "

                                                     * * *
    "This, in conjunction with present recall efforts, will result in the
replacement of all-aluminum
    high-pressure parts with brass parts. This interim measure will enable
the regulators to be
    used during the period required to manufacture non-aluminum regulators. "

<http://www.DIVERSALERTNETWORK.ORG/O2RECALL.HTM>

Later


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