The parts used in this cannon are as follows: (1) 3' length of 3" diameter pressure rated PVC pipe (1) 3'2" length of 2" diameter pressure rated PVC pipe (1) 1/2" PVC ball valve (the cannon may ...

A couple of ball check valves are used for air input and output. The resulting pump isn’t the prettiest of pumps, and it could probably do with a bit of balancing as it rattles somewhat.