No calipers, but the wall is pretty thick
All of my local stores only carry 3/4 and 1 inch valves, would like to replace in the future with a larger valve
Originally I wanted this to launch flour over a large area, velocity doesn't matter to me in this purpose
I fixed the sealing problem by adding ...

the short version: I may have bought a chamber sealing valve, lost the guide pin. Wanted something simple, so I just bought a barrel sealing valve (the orbit in the rest of the pics) and I'm leaving the other one to modify further when I have time to sit down and make a diaphragm and all the other ...

D_Hall: it does seal, I don't know what that bolt is, but I removed it, thinking it was the filter described in something I read here (and the one dewey-1 points out)

dewey-1: please correct me if I am wrong, but isn't a jar top valve one where the lid screws on (like a jar)? this valve is an ...

Thanks for the quick replies!

I had the valve so the output was towards the barrel, but just for giggles I tried it the other way, same issue.

Not sure what you gents prefer in terms of photo uploading, so here is a link to an imgur album

Chamber is filled with a schrader valve and a Husky 120 ...

First of all, I'd like to say that this site is beyond words in how phenomenal it is. I've been reading everything I can find here

Now then, my current project. This is my second pneumatic cannon, the first one I built years ago with my dad.

When doing some research for this, I decided to try a ...