4500 PSI tank o-ring

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13brv3

13brv3

Member
Feb 1, 2017
342
9
TN, United States
Greetings,

I'd like to replace my tank o-rings, since they're all pretty old, but I can't seem to find an official size, if there is such a thing. These are 4500 psi tanks using 7/8"x14 threads. I've found some packs of o-rings that claim to be the right one from one valve manufacturer or the other, but they never give sizes. I have to believe these are all the same, and can probably be purchased from anywhere that sells O-rings, but it would be nice to know the official size or a known source to purchase them if someone has that info handy.

Thanks,
Rusty



 
Thanks, but what I'm looking for is the o-ring that seals the SCBA valve to a 4500 PSI tank. I don't think the tank or valve manufacturer will matter, but they're Carleton tanks, and Drager valves, though I'll also want to replace the o-rings on Scott tanks with Scott valves. This is the best match I've found to the size so far- https://www.mcmaster.com/#93125k55/=1a0gq8j

Rusty
 
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Did you look at the last link with some neck size o'rings? The link claims to be able to print in actual size to match up rings. Just a guess, I never have pulled mine all the way down.
Also Joe Brancato from Airtanksforsale.com could tell you if he is willing to give up that information.
 
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"13brv3"I did miss that link, but unfortunately those sizes don't look like they'll fit. The OD of the valve is 0.87" and the ID of the tank is 1.136". The best I can measure thickness of the o-ring from old o-rings is 0.133". Standard dash size o-rings jump from 1/8" to 3/16" thick, and I don't think either of those is close enough.

Thanks,
Rusty

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Sorry.....
Those must be for standard tanks.
 
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"Centercut"I have both Scott and Interspiro SCBA tanks and both o-rings are an exact fit with the 22x3.5mm size from my metric o-ring kit. And they hold Air at 4500 psi.
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Thanks for the size. That's almost the same as the one I linked to, which was 21.7x3.5, and it's probably easier to find. Just common Buna-N, and not anything exotic right?

BTW, I sure meant to put this thread in the tank section, but somehow I didn't. Must be getting old(er) :)
Rusty
 
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