Quote: (Originally Posted by
Mark Chase)

ADV is a conveniance and a BOV is a life saver.
As for breathing off a ADV???
Bov's work on flooded units and ADV's dont always.
The Golum is an Apex internals and breathes like an Apex and the ADV on my Classic breathed like an asmatic on a bad day.
... and thats the way it should be: and ADV is not a second stage, is serves just to compensate volume decrease when descending
an ADV must have high resistence when breathing from it, so that you feel that you activate it: if not, you break your mix far to easy during deco, by inspiring diluent unwanted
paul