Pneumatic Tater Cannon

That black furball with white feet is a cat, so that gives ya an idea on the size of this thing.  It weighs a good
45-50 pounds too.  The pneumatic method is pretty neat and clean, but is more of a pain.  I prefer
the combustion launchers, but this is good to have around also.


1.  2" pipe about 5 or so feet long (barrel)
2.  2" 90 degree elbow
3.  small piece about 4" long of 2" pipe
4.  2" 90 degree elbow
5.  2" x 1" bushing
6.  1" male pipe thread (MPT) adapter (2 of them)
7.  WaterMaster electric sprinkler valve, about $13
8.  (Complicated)  I have a 2" x 1" bushing attached to the other 1" MPT adaptor, and a 4" x 2" adaptor connected to the bushing.  Next is a normal 4" coupling connecting this mess to the pipe.
9.  schrader (fill) valve.  buy one at a auto parts store, drill a hole, put one in, very simple.  also, put in a pressure gauge,  couple bucks. 
10. 4" pipe about 5 feet long (tank)
11. 4" slip cap
12. barrel support, make this out of whatever you want, but it is necessary.  that's a piece of pipe with zip ties on the barrel and tank. 

note:  all connections are slip other than the 1" MPT that make you able to screw this into the electric valve.
***Use primer! Have the glue and primer both open and ready to go.  Slop the primer on all connection surfaces and WHILE IT IS STILL WET run the glue in there also.  The primer and glue dry fast so have both out and ready.  It'll help keep this pipe from becoming pieces the size of an eraser imbedded in your pretty little skin.***
Some advice is to buy an electric pump, or you will be pumping this up for days to get it around 70+ psi.  The electric sprinkler valve is easy, connect the two wires to a little (9 volt) battery, or rig up a switch system.  The valve also has a manual switch that you can do also.
I am not responsible for what you do with this thing, please do not be a retard and point this at someone or shoot anything harmful such as rocks.  Keep this a produce gun, not a deadly one.