I would say steel pipes and fittings. Stainless steel or galvanized steel. They take a lot of pressure, but can be pretty expensive. You can buy them from mcmaster.com

Edit: Also, please don't double post. You can edit your last post to put in any more information.

Ball valve, butterfly valve, burst disk, piston valve, etc.
I would suggest the burst disk as it is full flow and opens pretty much instantly, which gives great performance.
Take a look in the wiki for how to make a triggered burst disk.

BTW, how are you pumping to 800 psi??? I would recommend just ...

Haha, I'll make sure to film getting my arm broken in two halves for you evil people to enjoy. :lol:
I'm still not sure how the cylinder can retract itself. I know there is a spring in the front, but the air pressure is still behind it! Unless the air is somehow vented? :?
Also, I forgot to ask ...

Hey guys! While playing Fallout 3 and trying to perfect my spud gun, I had a great (at least I think so) idea of creating a "power fist". :idea: The power fist is basically an unarmed weapon with two pneumatic cylinders that shoot at as you punch to deal serious damage. I'm thinking about using a ...

Thanks, will post the finished gun soon!

Hey guys its me (again :oops:)
One last question before I start buying and building (I promise :P)

For this valve
http://www.ebay.com/itm/GOYEN-CONTROLS-RCA45T000-PNEUMATIC-RELIEF-VALVE-1-1-2-NPT-NEW-CONDITION-NO-BOX-/310386643675
I know the input and output are 1-1/2 inch NPT, but what is the ...

Thanks, I guess I'll use this one
http://www.ebay.com/itm/8-Trampoline-Sp ... 4cfd7e4439

Could I just use the ball valve lever as a lever? If not, how do I make one?

But wouldn't one that's too strong be too hard to pull back and also damage the ball valve when it snaps?
Would this one work or does it need to be stronger? It has a 24 lb load.
http://www.grainger.com/Grainger/Extens ... Pid=search

Hey guys, so I've decided to spring load the ball valve on my metal pneumatic (WIP). I'm going to try to explain how it works, hope you guys understand. There is a 1.5" barrel, a 1.5" chamber, and a 1.5" ball valve between the two. The ball valve can be locked, and it will be locked closed. There is ...

Just tried the schrader, and after around 200psi the inside stopped working
I'm thinking about using a check valve after the schrader (without the core). However, will the brass explode at that level? Super paranoid me

Ok really sorry for all the questions today.
Is it possible to make a bike pump powered quick connect to replace a schrader?
Could this schrader valve take ~300psi? http://www.grainger.com/Grainger/LEGACY ... Pid=search

Thanks a lot guys! (and girls?)

It should work well then, good job.

I don't really get how that works, as the photos (especially the close ups) aren't very clear. From what I see, you replaced the nail on the barrel hose clamp with a longer one. As long as the threads are the same as the short nail, it should be ok. I'm really not sure what you did with the bottom ...

Ah, I guess I will use the thicker pink colored tape as it seems to be for compressed air. Do I wrap the thicker pink tape just like the normal white tape? (5-6 times around) Thanks guys 8)

Ok guys, so I wanted to use Rectorseal 5 for my threaded metal pipes, but the website I am buying from (grainger.com) states this:
"For Metal
Use primer to increase cure speed or to ensure proper cure on inactive metals."

Since stainless steel is an inactive metal, I will probably have to use the ...