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Vicente:It is that in the DIR dogma, the only valid configuration for doubles is steel bands and a manifold. If there is some other doubles DIR configuration, let me know. I have read much and dive with many DIR people, and use many of the ideas myself. But it seems to be all-or-nothing on certain things.
DIR does not require *steel* back gas.njscuba.net:"The only allowed DIR setup is double steel tanks with permanent stainless-steel bands and isolation manifold. There are other details, and some variance is allowed in tank size to suit the individual diver, but otherwise, it is implicitly assumed that this setup will cover all situations. It does not."
PerroneFord:It's not the gear. It's the diver.