The more gas you have on a dive, the more time you have underwater, and the larger a safety margin you have- although for an oxygen rebreather in a non-overhead environment, it mostly adds to dive time. Aylo writes:
I wanted to be able to carry not one, but TWO disposable oxygen bottles on a dive, so I went ahead and built a “manifold” based on the MAV components from my previous rebreather.
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