Do these constant flow systems worry anyone else? I saw the Draeger unit in the UK a few months ago and the first thing that hit me was that you rely entirely on the reg that's feeding the bag with new O2. Ok, so that isn't such a big deal. When it breaks you can switch over to a back-up reg, right? But how do you know when it breaks? It just stops feeding gas and the O2 in your bag gets lower and lower. Without a computer to monitor this, you might not know that your O2 stops until it's too late. That's one nasty (largely undetectable) single point of failure. Do others have comments on this? Devon
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