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Metal water bottle thread size?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Metal water bottle thread size?

Unread postAuthor: NatoHub » Tue Nov 25, 2008 4:03 pm

Do most metal water bottles have a common thread size for the cap (for use as an air chamber)? If so, what is it?

I'm looking to make something similar to this:
http://www.spudfiles.com/forums/viewtopic.php?t=15091&
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Unread postAuthor: VH_man » Tue Nov 25, 2008 4:22 pm

If you look, I beleive that tank was JB-welded on.

Try the threads used on garden hoses. At the paintball place i was at last, I could thread it onto the hose spigot....... Sending me on a great way to get the dents out of the dang things.
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Unread postAuthor: brplatz » Tue Nov 25, 2008 5:04 pm

Most likely it is a proprietary thread.
I used a old fire extinguisher bottle and it needed to be J-B Welded on.
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Unread postAuthor: NatoHub » Fri Nov 28, 2008 1:37 pm

I've never messed with QEV's or homemade piston valves (I've made a modded sprinkler), but could I basically make the above cannon with a QEV replacing his homemade valve? Seems like it should work, but I want to know if I'm right before buying a QEV online.

Thanks
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Unread postAuthor: NatoHub » Mon Dec 01, 2008 11:36 pm

Sorry to double post, but could anyone give me a quick answer? It's all I need to know to start buying parts. Thanks!

:?:
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Unread postAuthor: MrCrowley » Tue Dec 02, 2008 12:02 am

NatoHub wrote:could I basically make the above cannon with a QEV replacing his homemade valve?

Yes. :)
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Unread postAuthor: mark.f » Tue Dec 02, 2008 10:12 am

They are 3/4" Garden hose threads, I believe. Just buy an adapter to NPT for around 5 bucks.

EDIT: Yup.
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