Vacuum Cannon

Step 2 Attach the vacuum

Cut a hole somewhere near the end of the tube. Attach the vacuum to the hole. I chose to use another length of PVC to run from the PVC barrel to the vacuum hose. It is important to make sure that the hose won't get in the path of the ball traveling up the tube, so basically the hose can't be protruding to far into the tube. When attaching, make sure it is pretty air tight. Wrap it in duct tape a bunch and that should seal it.