(Somehow this took longer to write than it did to make. This may have something to do with the fact that I have to share this computer, but I don't have to share my tools.)

It all started innocently enough. I was in a production of a Midsummer Night's Dream, and it was decided that for this production the cast party would be a water fight. Mind you, the only other thing I had that counted as a water gun was a small spray bottle that leaked a lot and had a range of about 7'. So my words on the occasion were, "If I bring a water gun, I will build if myself."

And wouldn't you know it, I did.

This is a powerful water gun, make that cannon, capable of delivering over a quart of water 25' or more, and due to its dangling hose design your reservoir can be as large as you want (I use a 5-gallon bucket). However, that same feature makes it cumbersome to carry around while in use; I just intended it for it to be stationary. All the parts are available for about $60 from Home Depot, and probably from Lowe's, although some parts were only available through the Home Depot website.

Step 1: Acquire Parts

The parts list is as follows:


2' of 2" PVC pipe

I believe this size is available precut  in 2' lengths. But get 10' , this is mighty handy stuff.
2" of 1-1/4" PVC pipe
This is the first time I've ever had to use this size, so I got 2'.
2' of 3/4" PVC pipe
Alright, get the 2' lengths if you have to. But get 2 of them, as you'll need more for the connector tubes.
~1-1/2" of 3/4" PVC pipe (4)
For use as connector tubes. Length isn't critical.


3/4" PVC slip tee fitting
3/4" to 1-1/4" PVC reducing bushing
1-1/4" PVC coupler
1-1/4" PVC end cap


2" PVC slip tee fitting
2" to 3/4" reducing bushings (2)

This part does not actually exist, so use whatever combination of fittings you have handy. I was going to use 2" to 1" and 1" to 3/4", but I ended up using 2" to 1-1/2", 1-1/2" to 1", and 1" to 3/4".
3/4" PVC end cap
3/4" PVC threaded adapter
A small (1" wide) hoseclamp


2" PVC threaded adapter
2" PVC cleanout plug


3/4" PVC in-line check valves (2)

An O-ring
More about O-ring sizing later.
5/8" to 3/4" FPThose barb fitting
5/8" ID tubing

I used 5/8" ID by 7/8" OD clear vinyl tubing. It comes in 10' lengths; I used the whole thing.
(Note: never fear, these parts will be shown later on.)



Extra coarse, medium, and fine
Coarse round file 
Or rotary tool
Drill, bits, and Unibit
Adjustable wrench
Vise (or clamps)
Flathead screwdriver
PVC primer and cement

If you don't already have these, get the clear kind of both if available.
Thread sealing tape (Teflon Tape)
Electrical tape (if necessary)

Grease (Vaseline works)
Spray paint (or acetone)

About This Instructable




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