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You don't need one on a long hose, all you need is to be able to tell it from the other. So, one 2nd in your mouth, one on a necklace, and one on the slung pony/stage.
It is when you have two or more 2nd stages on necklaces or cliped off in a simular fashion that the confusion factor comes in. We lost divers, as in dead on the bottom, due to the confusion. They died with full back gas and an empty pony.
Seriously? More than one? Wouldn't the first diver who died because of the confusion provide a clue that there was something fundamentally wrong with this approach?
How's the saying go ... "It's a fool who keeps doing the same thing and expecting a different result".
I understand there's a mindset difference between east coast and west coast tech diving ... but if I knew that something confusing in a configuration had caused another diver to die, I'd give some serious thought to not doing it that way.
When I dive, I can carry four ... or even five ... second stages. There's protocols to make sure that the one you're breathing off of is connected to the cylinder you THINK it's connected to. They exist for a reason.
... Bob (Grateful Diver)