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yknot once bubbled...
With separate posts and an isolator, are you refering to using 2 sparate first stages? I am truly trying to understand your configurations. To my thinking, with single reg/first stage, both a BC and drysuit would feed from same 1st stage and neither would feed if you had a first stage failure.
Yes, two complete regulators, one on each post of your doubles with an isolator valve between. Obviously with a single tank you can't get true redundancy but then again you shouldn't dive singles in conditions that require it

WW