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The first step should be to adopt a standard for non-breathable
gases such as argon. Why not use the CGA standard? Of course, we
would have to modify/replace all of our first stages...  The
earlier comment by Marc Dufour about using removable adaptors
would also be a step in the right direction.

Next, I think we should have a distinct standard for any gas
mixture with an O2 content greater than 40%. This would insure
that only O2 compatible/clean equipment would be used with high
FO2 mixes or pure O2. Why not use the existing medical-O2
standard?

Other than these, I see no need for other standards for
breathable gases. If the diver can't figure out which regulator
goes where, I doubt that this person is competent to dive.

Let's not forget, that whatever the industry (or the diving
community) decides, there will always be a potential for
equipment tampering and accidents.

Richard

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