Air Chamber for Air Gun




About: Hey all i have built loads of weapons like slingshot, air gun, blowgun, knives, spears, animal traps and almost everything to do with hunting. SO if you have ideas about stuff about hunting leave a comment t...

This is how to make an air chamber to use in conjunction with my Pump action dart gun or a air gun

I will put good photos in soon but for now you will have to rely on paint for pics

And ill put in a vid soon

Step 1: Materials

What you need:

1 piece of PVC pipe 35cm by 50mm (or whatever)

2 end caps 50mm HIGH PRESSURE END CAPS because the the weak ones will make the chamber EXPLODE it happened to me.

plummers glue or dam strong glue

car valve or motobike valve

hose fitting

more dam strong glue like areldite stuff (for the bike valve and hose fitting)

se pic

Step 2: Drilling

get the end caps and drill the size if the bike valve and hose fitting so it is a snug fit

Then glue the craper out of it so its DAMMMM strong

Step 3: See Pic

seeeee picture |

Step 4: Building

now glue the inside of both end caps with plumbers glue or equalivent, after the valve and fitting are glued well
then attach end caps to PVC

you can also glue PVC where the end caps go


Step 5: Completion

YEY YOUR, DONE NOW PUMP IT UP usuall to about 120 PSI but be carfull and use safety equiptment you should hopfully gey a couple of shots out of it YEY


see pic



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    36 Discussions


    1 year ago

    which kind of bike valve is it


    12 years ago

    If you want to pressure test safely (the method you have in your last step is NOT a safe method). Fill the reservoir with water - then pressurize. Water will not compress and therefore you will have less stored energy at the same pressure. So should a joint fail - the amount of energy released is much less ;) Also, if you don't want your tank to "explode" (as per step 1), use ABS. If it does fail - it will not "explode" it will stretch. And when I say ABS, I don't mean the tubing used for drains and such (which is a multi-layered material) - I mean go to a plastics supplier and get solid ABS. Lastly - I get a bad feeling about a standard hose fitting considering there's better alternatives that cost very little :/

    6 replies

    Water will compress because it has air and oxygen in it. If you want something non-compressing use brake fluid. It's messy and will corrode things, but it won't compress and that's why it's used in brake lines instead of water. ;)

    If you decide to use brake fluid or similar fluid test a small bit on every part you're thinking of using first to make sure it doesn't just melt it down..example: brake fluid will disolve car paint and by the way, if you have a neighbor you hate give their car a brake fluid bath.. They'll love you for washing their car.... NOT!


    Reply 12 years ago

    It isent a standard hose fitting i just didn't know the name, but it is metal and works very well, the fitting i used is from an air compresser where it clips on to an air nossel or sprayer or whateva it is called, also the design posted here works damm well and i have put 240 PSI in it. IT COST ME $3.50 Australian


    Reply 12 years ago

    Ahh, I think you mean an airline quick connect (which has a built in ball valve). Knowing the right terms when documenting a project really everyone understand ;) I think a picture of the actual thing would have made it clear too :P


    Reply 12 years ago

    yes i think that is what it is trebuchet03 and ill put photos on soon which will make it alot easer to understand


    11 years ago on Step 4

    what psi hav u rated this to? as i see it made, i see it made around 250psi or a little more? lol and i dont like this idea for a tank(no offence), i am working on a 10000psi air cannon, i got the schematics made up nearly, and i am just saving up money for it now...

    4 replies

    These kids are probably of age by now and have jobs and can finally afford A $50 compressor I hope anyway.. anyway, for a cheap tank I was thinking if you can find then get your hands of a use oxygen tank...the type people with breathing problems drag around on small carts.. The tops come off easy. I strapped them to a tree then used a pipe wrench to remove the valves. Those tanks are solid aluminum and rated quite high. You can get them in metal scrap yards usually. Just a thought..Imagine the psi you can pump into those things!


    12 years ago

    for joining pvc, one should use pvc cement. is there a valve in this design somewhere? right now I'm seeing an open-ended chamber, which would make for a very poor pressure vessel.

    3 replies

    Reply 10 years ago on Introduction

    Ask the folks in the plumbing department at the hardware store what glue will work with your pressure-rated pipe. It is pressure-rated, right?