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Rick Inman:Four regulators. Would that be 2 on the H valve, one on the BCD inflator and one on... what, a pony? Or 3 on the H valve? And, why??
Actually, it's 2 on the right side of the H, and one + the PI on the left. As to Why? Well, I've always been of the mindset that if I want one of something, I take two. If I need something, I take 3. No, there is not a time that I have had to go to my tertiary, nor have I had to use my PI for a source of air either, however I do practice those skills. Actually, on alot of my dives, I will run through those skills on ascent. I have however had to go to my backup a couple of times.
As for why? It's just something that I've done for the past few years, and it works for me. The extra reg is not obtrusive, does not harm anything. It's not out there dragging on the bottom, not tangling on anything, and since it's a solo rig, doesn't bother anyone. I'm not sure why you question it aside that it's not the typical setup, but there's your answer.