![Image](http://img501.imageshack.us/img501/9536/img1073ek6.jpg)
Here it is in a backpack, perfect for concealing it.
![Image](http://img340.imageshack.us/img340/6995/img1076sz3.jpg)
The entire water gun.
![Image](http://img340.imageshack.us/img340/7859/img1078ba6.jpg)
This is where the water is let through to a tiny hole in the very end.
Usually operates between 60-110 psi and supplies enough water for about 2-3 minutes of continuous spray.
I built most of this out of left overs from a previous sprinkler installation in my front yard so it was very cheap to make.
Specs:
2-liter soda bottle (will probably upgrade to 3-liter)
Operating Pressure: 60-110 psi
Built from 1/2 hose and 1/2 PVC parts
Ball valve operated