4. I do not know from your post if your dive buddy has experienced diving as the OOA / recipient diver, breathing from a second stage on a long hose (7ft), that you are supplying. If not, once she tries it, I suspect she will love it. It is SO-O-O easy. My wife and I both dive a long primary hose. And, her SAC is lower than mine. So, when we dive on Bonaire, we usually spend time a) practicing air share drills, and b) using an air share - from her to me - to balance the gas supply in our AL80s. With a long hose we can swim comfortably, near each other but still with a bit of separation, along the reef and see the cool stuff, and end up surfacing with the same amount of residual gas.
