chrpai
Contributor
The way I see it, I already have a redundant 1st stage. It's on my buddies tank.
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I don't see the point, especially at the cost, but here's another one i've seen around
Apollo Dual System For Single Cylinder H-101S - Dive Imports Australia
I have observed that during the dive trips groups consist of strangers and the appointed "buddies" tend to desert each other. Diving from a commercial diveboat often turns out to be a solo diving.