Around here we use air tanks off diesel trucks.They use them for air brakes.They already have the outlets brackets and come in a variety of sizes and shapes.You can usually find them at a truck wrecking yard.In Fresno theres a place that has them piled up against a fence.They have a few hundred of them for $12 each.
On my beast I integrated them into the flatbed subframe.Check it out;Air Tanks
I use a fire extinguisher. Works just fine. I use the hose that came with it, and clamped a barbed air fitting to it. Then gutted the handle and plugged the hole on top.
Off the pump I have a "T". One hose goes to the grill, the other to the tank. There's actually a second "T" there as well that has the ARB cut out switch. So, I can disconnect my tank, and still pump air without the tank.
It's a crude system, but works great for virtually free.
Dude, listen to crwln73, get yourself an air tank off a semi-rig, they have the *everywhere*, you can get them for cheap, and it's a lot more flexible than using a fire extinguisher. Sure, the FE works, but if you can find a tank for under $20 that already has all the fittings and mounting brackets to boot, why bother?
The one I have was $20 and it was MINT, it's a 2.5 gallon capacity that has mounting brackets (with captive nuts) and four threaded holes, one at each end, one above, one on the bottom. Came off the air brake system off a medium-duty cargo truck, from a cluster of four.
A friend worked at a rental repair type place and they had a huge supply (ie pile) of busted air compressors that contractors (ab)used. All shapes, sizes etc. of tanks, hot dog/pancake whatever. He was chargen a few bucks to cover his time to unbolt all the non-working parts.... Lots of bungs welded in the tanks too....
I used a complete - junk/broken air compressor from a contractor friend. It came with damn near everything I needed to make my on board air. 2.5 gallon tank, hoses, fittings, pressure switch, pressure relief valve.
SO... If you can find a broken air compressor get the whole thing!
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