Introduction: Best Water Gun Ever

Picture of 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

Picture of 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

Picture of 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

Picture of 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

Picture of Fire at Will

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


yamahaenticer. made it! (author)2017-09-17

i made three of them out of the dry chemical ones instead where they are easy to find . just empty them of powder, drill a hole on side at the top to allow for a threaded tire valve like they use on big trucks you can see them in pic i uses a piece of coat hanger wire to get valve in right spot then cut off wire later ..

make sure you clean tank out with warm soapy water befour useing

Budweiser143 (author)2015-01-03

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.

Jimmy Proton (author)2013-06-21

how long doe it last?
I could make a flame thrower out of this :3

scotsrule08 (author)Jimmy Proton2013-06-21

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)

HowToBen (author)scotsrule082014-08-24

So ironic. Fire extinguisher to flamethrower conversion.

allmercy (author)2012-02-11

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.

Schober (author)2011-08-25

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.

scotsrule08 (author)Schober2011-08-25

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

Fire Explorer 3 (author)2010-12-02

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!

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