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You can buy a paper copy via NSS-CDS. https://nsscds.org/shop/book-cave-diving-communications/

a and b are the clutch phrases, but I am guessing you don't understand the magnitude of them. Regarding a You can turn around (at turn pressure even) and go back closer to the entrance, recalculate gas, and go down another passage with some of the remaining. If you want to reserve the option...

They may spec the air at D but it's not like they use a lessor quality filter to make it. If brought for analysis at a gas lab I would be shocked if it didn't meet E. It's the same thing with O2 and helium. Industrial O2 isn't "dirtier" than any other grade just less thoroughly documented...

CGA specs both a grade E and a grade D breathing air. D is/was for surface use only. Those specs were written decades and decades ago. In actual practice, you will not find a "lower quality surface use only breathing air" anywhere, there is zero market for grade D air.

Are you talking about Malta, Quebec or France? Then it might (very remotely) matter. Everywhere else probably not

A very small chance that WRTSC agencies will refuse to accept NAUI certs for agency cross overs (AOW prerequisites for rescue etc) and vice versa. But I don't have a crystal ball on how they will treat each other's cards in the future. They never did :)

Stop inviting them aboard and/or pay for the boat yourself if it's stressing you out. Otherwise why does it matter? You're on an extended SI anyway right?

They are gorgeous, its a shame there aren't better color swatches on the website

Threads should not be destroyed on a condemned cylinder. It remains the owner's property and potentially has use as a non-pressure vessel even.

Are you aiming at the winter hockey lake and summer dive resort biz?

The atmosphere is 0.045% Co2 your exhaled breath 4-5% so ~100x higher. The Co2 getting into the keg through opening and closing and the walls of the polyethylene keg itself is inconsequential

You can use this H valve as a way to take the ice diving course in the immediate future sure. But it's a dead end. As soon as you actually get doubles and switch to them, you'll be looking at the weird valve in your scuba shed wondering why you bothered to spend 50 euros on it in the first place.

Just take the doubles primer, I have an H valve and it's really a dreadfully poor mismash of knob directions and reg to knob conflicts. Also nearly the price of a manifold anyway.

Tell us more about the dive? Is there a raging current? Are you in a cave swimming against that current? Is the water temp 2C, 7C, 20C, 25C? Is it a silty overhead? Is the visibility 2m, 10m, 50m? Are you surveying or collecting data/information that requires math or legible notes? How long...

It was late, forgive me father for I have sinned and forgot the magical 4th stage on that horrendous MCH6

Unless there is actual blood in the water Padi will do nothing. You're wasting your time just name the shop here and find someone else to patronize

That's a whole lot of swimming at 30+m on air dil. I am leaning heavily on WOB and CO2 retention as well - moreso than any kind of breakthrough

You're chances of finding these are next to nil. Those of us diving CCRs are not going to part with the bottle side. You can still buy them new if you wish to stick with the Tiger brand. Tiger Gear Tiger Pony Bracket | Dive Right In Scuba - Plainfield, IL

Third cylinder ring blow by. Basically it's a super cheap compressor and not expected to last.

You're fine. The worst of the worst case is a neck seal failure on the surface. Flooding, loss of buoyancy. Can you stay on the surface in a single steel of air with a 35lb wing? Yes more of less if you ditch some lead. I would not upsize.