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Then it sounds like you're gonna be starting the group from the ground up, kinda like we did for our area. It's hard, but fun. Best of luck on that one!

Excellent report! You flew halfway around the world for a two-day class! Wow. That shows dedication. Even with the private days tacked on the front and back making it more worth the trip, it's still admirable and quite an effort. My brother is getting certified later this month, (either by...

Here it is. Flat bottom 12L 232 bar cylinders, equivalent to HP100s: NEW – “flat-bottomed” Eurocylinders | Silent Planet http://www.silentplanet.info/customerdownload/press/flat-cyl-press-release-oct2010.pdf

A little google digging discovered it could be a trim issue as well. A company in England a few years ago made (and might still be making) concave "champagne-bottle" bottom cylinders, like my '53 PST. They indicated that it added .6 kilos to the weight of the tank, (maybe 1.25 pounds), and it...

On a related note, I have a PST steel tank from '53, (service pressure 2150, not 2250), and it has the concave "magnum champagne bottle" bottom, which like the above tank, allows it to stand up without a tank boot, which I find pretty awesome. (I despise tank boots). How come new steels...

Cool. I'm hoping I can pull the remains out and it being buggered won't affect function. Then I'll go through my parts list and see what it lacks. I think just the bushing and a new spring should set it up. Then I'll have a nice knockaround set of doubles regs. My usual backgas regs are...

Oh, I also forgot that the Mk20/25 has two grooves. Why I forgot that is killing me. Oh well, it was late and I was tired. LOL.

Thanks for the help all! I've only serviced one Mk15 and it was ages ago. I'm in San Marcos, right up the road from SA. I looked at the one that is missing the spring, (since it's screwed together loose), and what do you know, some duffer buggered up the body right at that pressed-in ring...

Sounds reasonable. I'll stay tuned, and if I need an update kit, (or two), I'll drop you a line, so please set aside a couple for me! As far as the piston head o-rings rolling one another, why isn't that a problem on the Mk20/25? I've wondered that ever since I saw the Mk15 used the spacer or...

DA Aquamaster and others: I don't have my parts book in front of me right now, but I have a question. I just came into a couple of Mk15s in good shape, (aside from needing a full service and overhaul) but one is missing the piston spring. Is the piston the same as the Mk25, (IE, I could just...

So running in Gauge mode, there should be no difference?

Dunno. I just bought an older Aladin (NIB) Tec 2G from a buddy. I work in a Scubapro shop and we sell the new Aladin (non-Tec, apparently) 2G. I'm interested in feedback or issues. I'm also curious on differences, aside from name, between the Tec2G and the 2G. The look identical, aside from...

I post on a lot of forums and grab the best image macros and reaction faces for response images. I often find it funnier to use them for a response.

Rule Four: "Always analyze your gas". I always do, even when breathing a known mix that I mixed myself. Shoot, I even analyze air. If for no other reason than to stay in practice and ingrain the habit.

Nope, it's still for sale. 70cm or 28" hose on the green primary and standard length octo hose (90cm or 36") on the yellow octo. $450 shipped.

The first stages are fine, since they are diaphragms and the IP is adjustable with a hex wrench. You can set it from ambient all the way to 300+. It depends on how you adjust the spring cover, like all diaphragms. The ports are standard 3/8" LP and 7/16" HP as well. I recall reading on the...

No worries! Glad I could help out. I like Poseidons, even though I'm selling mine off for philosophy-compliant regs, and I just wanted to dig into the whole "Poseidons run a high IP" thing, since it causes so much confusion among a lot of people. It's only one model. The others are...

Common IP, (Intermediate or Interstage Pressure) for first stages is 125-145psi. Unbalanced piston firsts will often drop 20 or so psi over a tank, so if you set the IP at 145 at 3000psi supply pressure, when you are at 500psi supply pressure, your IP is 120-125. This is noticed by the reg...