This static prop from the Spirit store will jump
out 4 feet on a scissor device.
Before building any pneumatic prop I strongly suggest you read this!
Click below for details on the construction of the prop.
Click the Halloween Fear link below for details on the sprinkler valve
manifold that operates the prop.
It costs about $23 to buy the parts to make.
(New Note: I have been told that you can purchase a valve (manifold) cheaper
than you can make one. (See Below)
You can buy a valve similar to the one shown in
the link below from Fierofluids
for about $17
images\3 way valve.doc