Best Water Gun Ever




my dad taught me how to make this amazing water gun today so i thought i would put it on instructables for this project you will need

an old fire extinguisher (pre 1990's)
an air compressor that can go up to 120 psi

Step 1: Find Supplies

we went to a garage sale today and bought a perfect fire extinguisher for a $ 1.50 but im sure most people wont be that lucky so i would look at garage sales and on craigslist and other places for one it should be a large fire ext. i think mine is like a 2 gallon .

Step 2: Preperation

remove nozzle apparatus and fill about half way to 2/3's full and put apparatus back on ( make sure it is on correctly and very tight ) 

Step 3: Compression

after you tighten everythig up your ready to compress it . on most of the fire extinguishers at least the older ones have a bicycle valve so you can compress it . when you are compressing it listen for leaks and any wierd sounds except for a bubbling sound in the container that is fine .
compress to 100 psi ( most fire extinguishers have a meter )

Step 4: Fire at Will

pull the safety pin if there is one and it should shoot 25-30 feet in a strong beam of water.



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8 Discussions


4 years ago on Introduction

These things are awesome!! My father is a fire fighter, so we used to
have a few of these. I used to love playing with them in the same way! I
now borrow them from him when I go on camping trips, in case our fire
starts to get out of control, or just at the end of the weekend when its time to put out.

It depends on the psi that the extinguisher is under. My usually lasted 30 seconds or so. If you do decide to use it as a flame thrower I would replace the tubing and nozzle to a metal one. (Note: I do not take any responsibility for damages or injuries with the use of the gun)


7 years ago on Introduction

On Ebay I sell them seller ID Allmercy just do the advanced search by seller and put my ID in and buy one or two or ten.


7 years ago on Step 2

I have one that is almost exactly the same as that. Including the little white plastic tube in the end. I measured the amount of water that I put in and found that when I put the labeled amount of water in the tank it met up with the bottom of the plastic tube so now I just fill to that tube every time.

1 reply

Reply 7 years ago on Step 2

awesome, i just guess every time. thank you for reading my instructable

Fire Explorer 3

8 years ago on Step 4

I have an old one my dad acquired that i'm too lazy to fill and bike to the gas station... Can't wait 'till next spring, though!