Left-lean / Right-rich, tanks are tagged and your buddy niet to give you a Ok, I as a extra have complete different regulators, so even in bad visibility or lost of torch in a dark place you can by touch know the difference between bottom gas, 50% and 80 %When switching to deco tanks you should be able to see them and make sure you take the 50% and not the 100% tank at 21m. That's easier when they are below the sidemount tanks.
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