> John have you always analyzed your air cylinders? even when you were an air > diver.? No, years ago I did not always analyze my air cylinders. However, by the time I took the rebreather course, I had become paranoid enough to analyze everything that I was going to breathe. The only cylinder that I don't analyze is my argon bottle (yup, I check the oxygen too.) In any case, like Trout, none of my cylinders actually have air in them. "Air" cylinders actually contain 20/25. You can bet that I analyze these cylinders. -John
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