While my big cannon project is delayed waiting for parts to ship I thought I'd see if I could make a little one out of spare parts. Here's what I came up with, its a little barrel sealer with a 3/4" chamber and a 1/2" barrel. Didn't have any little bushings so I dremeled out some reducer couplings. ...

Not to be the bearer of bad news but that pipe is dwv, Im not sure if it is pressure rated but if its not....KABOOM!!! Just trying to watch out for you safety. Happy spuddin' It all says its pressure rated, I think. http://img89.imageshack.us/img89/6583/pa250060ou4.th.jpg http://img89.imageshack.us...

Ok, thanks for the ideas guys. jrrdw your cannon is awesome, the shooting 10 superballs part is great!

I was going to make it be interchangeable between 3" to 6" if I can find the right parts. Right now all I have is a 4" barrel.

Thanks for the replies they've been helpful. I think I might try making it a barrel sealer. Heres my ideas so far http://img251.imageshack.us/img251/235/valve1ek3.th.jpg Do you think this set up would work? The 3in" end cap fits right in the 4" barrel, if I put a slightly larger sealing face on woul...

I'm making a cannon for my work to shoot small pumpkins (or very large spuds) and I'm having some trouble coming up with what to use for the piston. I've searched all over the forum and havent been able to find any 4" pistons that I can actually make. Its going to be used in a 4" tee and be a chambe...

3" end caps actually fit really snuggly in most 4" tee's. I'm thinking of the same thing for my cannon.

I was looking at www.sprinkler.com and they had this pressure rating list for their fittings. Anyone know if the ratings are 100% right? Sch 40 Fittings- Schedule 40 (Sch 40) fittings are rated on wall thickness. Due to this fact the pressure ratings for the size of fittings will vary. The pressure ...