How to Modify a Sprinkler Valve for an Air Cannon

IMPORTANT I would highly recommend using JB-Weld, the official stuff (a 2 part epoxy) because the kind I got takes far too long to dry and isn't as powerful and stong as JB-Weld is. Also, I finished my air cannon! I will make a video showing how to make it and a few test shots with it soon! I know theres a few other videos about this, but they weren't too clear and in literally 240p so I figured I'd make a new one in HD for you guys, enjoy :) More videos about this to come soon!