[bherring68]

Does anyone know the neck thread size/pitch for the 1.5 liter oxygen cylinder used on the OMG C-96 Pro rebreather?

I recently purchased one and would like to replace the cylinder with one approved by the DOT. In two days when the unit arrives from Florida (shipped it after my class) I'll be able to pull the valve and see. I'd just like to get a head start if I need to do something more complicated than screw the valve assembly onto a new tank.

Thanks,
Bill

[Dave Sutton]

Uhhh..............

It's Metric "Kleinkonish" (metric tapered thread), so no burst disc valves fit. But the real issue is that it's not a "valve", it's a valve *and* a manual addition valve as well, in one assembly. There is no way to change it. Plus, the cylinder is not DOT, so if you're worried about the valve, you'll be worried about the cylinder too. Frankly, I'm not worried and have been playing with these for years. Fill your own 02 and forget about it.

*IF* you really want to replace the valve and cylinder with DOT stuff, I make replacement stuff for these and can fix you up with a DOT cylinder, a standard first stage regulator, and a manual add valve that connects to the rig thru a QD. Sadly there's no other option. I do take trade ins of the old bottles though, so let me know if you really feel it's an issue. Personally I'd forget about it and use it "just like it is". I fill 02 into these just down the road in Narragansett RI, so if you come up against any 02 issues, shout. If you need a 02 transfill setup to fill it yourself (yes you do...) we can fix you up with one and get you 3000 PSI 02 boosted into an alu-80 for transfilling as well. One alu-80 will last a year of diving unless you want to buy (and handle) a K or J bottle at your house.

You'll have a ball with one of these here. New England shore diving BEGS for 02 rebreathers. Do yourself a favor and let me fit a P-Connector and a simple PP02 monitor to the thing. At the very least it'll make the pre-dive purge a known thing and not a "blind drill", and at the best might save your life. I add one to every 02 rig I dive.


Dave

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[bherring68]

Thanks for the information.

Quote: (Originally Posted by Dave Sutton)

Uhhh..............

It's Metric "Kleinkonish" (metric tapered thread), so no burst disc valves fit. But the real issue is that it's not a "valve", it's a valve *and* a manual addition valve as well, in one assembly. There is no way to change it. Plus, the cylinder is not DOT, so if you're worried about the valve, you'll be worried about the cylinder too. Frankly, I'm not worried and have been playing with these for years. Fill your own 02 and forget about it.

.

I have no concerns about the safety of the valve or cylinder, just the ability to get it filled in the shops when I head out of town. Adding a low-pressure line with manual add button to my deco reg and running the rig from that set was something I was looking at. I just really like the add button it came with.

I'll send a PM about the rest in a day or so (have to talk to my dive buddy about taking his car to RI).

Bill

[Dave Sutton]

Quote: (Originally Posted by bherring68)

I have no concerns about the safety of the valve or cylinder, just the ability to get it filled in the shops when I head out of town. Bill

Just get over the idea of getting it filled *anywhere* and you'll be all set... .

The average LDS, even if they have 02, is going to refuse to fill it. Nobody will care about the valve, it's the non-DOT cylinder (and the inability to get a hydrotest done on it) that'll be the killer. No different than what we face with (Mark-15 spheres, Draeger FGT-1D cylinders, LAR-V cylinders, early Azimuth cylinders, any of a variety of Russian cylinders, etc). You need to be able to fill your own. Just part of the rebreather-game.


Dave

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[Tom Rose]

Quote: (Originally Posted by Dave Sutton)

Just get over the idea of getting it filled *anywhere* and you'll be all set... .

The average LDS, even if they have 02, is going to refuse to fill it. Nobody will care about the valve, it's the non-DOT cylinder (and the inability to get a hydrotest done on it) that'll be the killer. No different than what we face with (Mark-15 spheres, Draeger FGT-1D cylinders, LAR-V cylinders, early Azimuth cylinders, any of a variety of Russian cylinders, etc). You need to be able to fill your own. Just part of the rebreather-game.


Dave

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Amen

Even if you go to a US system, you are much better off doing it yourself.

Tom