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So why don't they use the 7000 series alloy?

PST did indeed make plenty of LP120s. 8" diameter, not quite 30" tall, weighed almost 52lbs empty. Big tanks. I'd post a pic (if I could find one) but honestly they look like any other PST hot-dipped galvanized cylinder, just...really big.

I wonder if they did the recommended PST hydro pre-test on applicable cylinders...

Luis, if you look on your camera there's a pretty good chance you can change the color balance. Set it to "incandescent" (or something equivalent) and that light will be represented as a much whiter color. Let me get you a photo of my 72s and we'll compare. ;) Something tells me yours have...

I believe Thomas' argument will make more sense if you read further than the one post you responded to. :coffee:

I dive in (almost) all black because that's just what I prefer. My Pinnacle wetsuit has a few other colors though. Eh, whatcha gonna do?

Monkseal has it right -- this sounds like the classic "don't solve a technique issue with gear". :D Just make sure you can tell exactly where you are clipping things. On that note, it will occasionally happen. Not a big deal.

Personally I see this as a "chicken little" scenario. For starters -- I understand and accept the risk of overfilling, and so do the people who fill my cylinders (if I'm not filling them myself). If they didn't accept that risk they wouldn't do the filling, would they? While I understand...

On the other hand, years and years and years of anecdotal evidence says the risk of overfilling LP cylinders to 3600 is quite small.

$5 per tank at my favorite shop. It went up 25% since last year when it was $4. :shakehead:

Cool photos Luis --- very clean interior on that second cylinder. Neat how the interior can be perfectly clean while the outside has been pretty worn.

Why are you interested in doubles?

Quit waving your arms around.

You are looking at an older steel 72. Congrats -- if it is in good condition you just got a great cylinder! Are you able to post pics? If the cylinder is in good condition and you treat it well, chances are good it might outlast you. ICC: Interstate Commerce Commission (before the DOT)...

I use a Torus 38 for double 72s and it works great. I have also heard that most 72s out there are neutral to ~ 1lbs negative when they are empty. Hmm....probably depends on the manufacturer.

I was waiting for the RC anti-aircraft guns...:D

My cave buddies and I consider both Ginnie and Orange Grove to be the "ghetto of cave diving". That video made me sick. Holy crap. Of course when I saw the link I already knew what to expect. :rolleyes:

According to a previous thread, the OP is 14. Not that you couldn't tell from the run-on sentences and lack of proper grammar and punctuation. :shocked2: Dori Fish, let me assure you that most people will take you much more seriously if you write using proper grammar; otherwise we'll just...

The DIR police will come get you if they find out.

If you recall (since you were present for my first dive in doubles), I was 20 and it was my 41st dive when I strapped Jason's double LP95s on my back. Just thought I'd throw that out as a measuring stick, perhaps...