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i agree.Training situation, trying to replicate actual gear if possible.
I routinely dive SM with Roberta's Dive Shack in Coz, but they don'e have mirrored valves. I suspect you are right that few if any will have mirrored valves. The times I have crossed to the mainland and dove cenotes, mirrored valves were available.no problem on the mainland thats for sure. it might take some doing to find then on coz. most shops dont know much if anything about sm there.