This is from a Voyager submarine passenger cabin. Looks very similar to the one that sank in Egypt. These subs carried 48 passengers and 3 crew to 100 meters.
I got liquid O2 and aviators O2 from AirGas for many years at the two different dive shops I owned. They told me that they pulled a vacuum on the aviators' bottles before filling them to ensure lower moisture and remove contaminants.
They did not do this on welding grade O2 because it does not...
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