Storage: 22 feet of 2 inch "L" copper at 160 psi
Barrel: 9 feet of 2 inch "L" copper, muzzle loaded with camlock quick connects
Valve: 2 inch ASCO explosion proof solenoid modified to actuate via a 3/4 inch 120 VAC explosion proof ASCO solenoid
Trigger: Single pole AC switch on the neutral leg
Pilot Volume: not sure but small
View of Cannon:

View of valves and trigger:

Video of first shot:
[youtube][/youtube]
Damage pics. Lumber is pressure treated 2x6 and is the top of a picnic table stood on end.

