CO2 tank threads

noname · Mon Sep 10, 2007 9:24 am

I've heard lots of people say that unscrewing the needle valve from a paintball Co2 tank is extremely hard or near impossible. Not true! All you need is a vice to hold the bottle and a pipe wrench to uncrew the valve. The bottle can be attached to normal steel or brass or whatever kind of pipe fittings you want, simply by using 3/8" NPT fittings.
A 9oz CO2 bottle would be a gret hybrid chamber, just put in a schrader valve spark plug (or an actual one if you have the tap), a propane meter and air source, a 3/8" union, and you're done. The bottle will never fail, because they can easily hold 3000 psi. An emty 9oz tank should be less than $10, cheaper than a Sch 40 steel chamber.

psycix · Mon Sep 10, 2007 9:29 am

well ehm... cool

CannonCreator · Mon Sep 10, 2007 6:00 pm

Wow! this is actually a good thing to know. Thanks for posting this!

Scope · Mon Sep 10, 2007 7:08 pm

20oz co2 tanks are rated for 1800 psi i believe. burst disks are 1.4 k?

iPaintball · Mon Sep 10, 2007 7:17 pm

Noname, don't make the same mistake I did. After you remove the needle valve, the actual bottle threads apper to be standard 3/8", but they are not. A 3/8" male fitting will screw in about one turn, but after that, it won't go in any farther.

noname · Mon Sep 10, 2007 9:18 pm

I was capable of screwing in a 3/8" nipple as far as it would go, or screw the needle valve all the way into a 3/8" female fitting.

frankrede · Mon Sep 10, 2007 9:23 pm

iPaintball wrote:Noname, don't make the same mistake I did. After you remove the needle valve, the actual bottle threads apper to be standard 3/8", but they are not. A 3/8" male fitting will screw in about one turn, but after that, it won't go in any farther.

no...I have done it and it works, but I use a 3/8" tap for even better threads.

Orpackrat · Mon Sep 10, 2007 9:35 pm

Scope wrote:20oz co2 tanks are rated for 1800 psi i believe. burst disks are 1.4 k?

Burst disks are 3,000psi.

beebs111 · Tue Sep 11, 2007 9:01 pm

i was under the impression that burst disks were 1.5-1.6k but meh. what do i know?

)DEMON( · Wed Sep 12, 2007 10:01 am

There are different strength burst disks I believe. When it says k for a value it usually means 1000x that number.

dongfang · Thu Sep 13, 2007 3:49 pm

Hi,

I was capable of screwing in a 3/8" nipple as far as it would go, or screw the needle valve all the way into a 3/8" female fitting

Not that I know anything about it, but couldn´t it have been the case that one of you successfully screwed in a cylindrical 3/8 fitting, and the other one of you could not get in a tapered 3/8 fitting?

Regards
Soren

iPaintball · Thu Sep 13, 2007 5:14 pm

That might act ually be the reason, but I can't find any non NPT thredded nipples...

Hubb · Thu Sep 13, 2007 5:21 pm

dongfang wrote:Hi,

I was capable of screwing in a 3/8" nipple as far as it would go, or screw the needle valve all the way into a 3/8" female fitting
Not that I know anything about it, but couldn´t it have been the case that one of you successfully screwed in a cylindrical 3/8 fitting, and the other one of you could not get in a tapered 3/8 fitting?

Regards
Soren

Or maybe the threads got cross threaded.

Gun Freak · Tue Aug 02, 2011 6:09 pm

I know this is an old thread, but I was going to start one just like it.

I want to take the pin valve out of a co2 tank, and then attach it to a slide valve/QEV gun for semi auto. I have a 3/8" tap (harbor freight junk) so will that work on the inside of the tank so I can use npt?

Lockednloaded · Tue Aug 02, 2011 6:52 pm

I believe you'd need a 3/8" flare adapter to NPT, I've heard those fit perfectly

CO2 tank threads

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