4500 PSI tank o-ring

[13brv3]

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

 

[Dirte]

Which tank and what o'rings? Here is a link I posted that has the common DIN fitting o'ring if that helps. http://www.airgunnation.com/topic/o-ring-for-benjamin-300-din-male-adapter-fill-adapter/

 

[13brv3]

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

 

[Dirte]

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.

 

[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

 

[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. 

 

[Dirte]

"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

Sorry.....
Those must be for standard tanks.

 

[Dirte]

"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.

Thanks for the size..... I will have to pick some up myself to add to my o'ring supply.

 

[13brv3]

"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.

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

 

[Centercut]

Yep, standard buna N 70 duro o-ring. 

 

[13brv3]

Thanks again,
Rusty

 

[Losmeister]

I bought a used Omega tank with an apeks diving gauge from someone here on the forum....went to get it filled and it leaked... scuba shop guy advised I get a new o ring for it and then get it hydro tested...

I am kinda ( at least 50%) assuming this thread applies to my tank too.

7/8 thread ..... any input would be greatly appreciated...... I thought i'd be shooting today :-(

 

[KatoKevin454]

SCBA Valve O-ring size
metric
ID 22mm
OD 29mm
CS 3.5mm
or 22 x 3.5 x 29
SAE
ID .87in
OD 1.13in
CS .14in
or 7/8 x 1/8 x 1 1/8

 

[Losmeister]

SCBA Valve O-ring size
metric
ID 22mm
OD 29mm
CS 3.5mm
or 22 x 3.5 x 29
SAE
ID .87in
OD 1.13in
CS .14in
or 7/8 x 1/8 x 1 1/8

thanks Kato!!!

 

[3Crows]

It is a size 214 O-ring for the 7/8 valves.

 

[bf1956]

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

Wrong place, scroll down to proper heading.

 

[rangur1]

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

Maybe not, but a hell of a lot of pressurized air to find out. Drain your tank completely and remove the valve system and measure, my friend is experienced with this and it still took us 2-3 sizes to get it. Please don’t FAFO this. Get some quality calipers and get sizes on both sides of your measurements from o ring store. They are cheap are sell quantity. Once you have it, label and save the rest.