this cannon is a backpack cannon. It pressurizes the back portion. a tube leads off the back over your shoulder to a barrel extending outward. The valve is located over the left shoulder.

parts list

5' of 3" PVC

7' of 1 1/2" PVC

4 3" 90 degree PVC bends

one 1 1/2" valve

one 1 1/2" 90 degree bend

two 3" to 1 1/2" converter

1 1/2" PVC converter to screw in

metal screw ins to bike pump converter like in the others

backpack cannon in action