so my local menards has rainbird 1" sprinkler valves on the shelf. i think im going to make something similar to this (thanks dewey)

what can i use to adapt 1/2" x14 bsp to npt? is there something on the shelf i missed?

i like that one, unfortunately it runs off propane. ill be using regulated air from a paintball tank. ive see rigs using 12 gram co2, some pipe and a ball valve work. is that because the pressure is so high? my alternative is to buy something purpose built like this http://www.metadyneindustries.com...

the sprinkler valves seem too big for a compact carryable design. is 1.5" the smallest practical size?

i can find 1/2" qev's easily enough, will that still be too small?

im considering a 1/8" unit simply because its the right size fitting to make things super easier for me. would the pressure requirements be too great for the qev? would i have a hard time making 140fps?

Id like to put together a cannon to shoot nerf vertex rockets. primarily used to entertain the kids but id like to use it as a law rocket in paintball. 2" barrel ID iirc. I think ive got this figured out but i could use some help finding a qev and 3 way to fire this. Could someone point me in the ri...