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20 FT DIVE.. SOLO...OMG! Seriously, does an octo have a whole lot of value to a solo diver in 20 ft of water? Not much utility in my book... A few weeks ago, I pulled an old pony bottle reg out that i wanted to test. So I dove it in 15 feet, no spg, no octo, no inflator hose ...just first and second stage... no big deal....for certain people in certain conditions.
I would have gotten on ScubaBoard using my smartphone and asked for several hundred opinions.