Make a Vacuum-cleaner Bazooka

Step 2 Make it

• Attach the 3-way junction to the straight tube, using duct tape (you can glue the parts with PVC glue, of course, but there's no good reason to do so).
• Wrap duct tape around the tip of the vacuum cleaners' hose, so that it fits snugly into the slanting tube. This fit should be as air-tight as possible.
• Push the vacuum-cleaners' hose into the slanting tube of the pvc junction part.
• Test whether the projectile can run smoothly through the assembles PVC tubes, when the vacuum-cleaner is attached.
• That's it :D