It was this one i was talking about

hauntedyards.com/cannon1.html

The sprinkler thing i picked up from Home depot for $11, if you watch ebay you can get the 12volt power supplies for .99 cents, i got a bunch off there for that price. You can also find air tanks off there for around $9.99 i seen, but I already have about 8 around here I'm not using so didnt have to purchase one.

Cindy