In Sydney, the use of nitrox from what I have seen is restricted to deco gas. The rest is done on air. Cylinder markings vary, but are a carry over from the US where O2 is green. Here O2 is black with white shoulder. What I am trying to get divers I dive with to do is just mark the tank in big letters/numbers with the MOD of the mix. That's all that matters. Rod Nairne.
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