air tank

[camoit]

For Gods sake NO!!!!! Don't test Darwin's thiery.... Go to a local diesel truck wrecker and buy a tank for $25.00 with the clamps. You can even get a one-way check valve for between the compressor and the tank. If you want the cool look, then use a scuba tank. You could find a used one that is not for diving by calling a dive shop or ebay.
Here is a pair for 75 local to me. I could pick them up for you and shio to you.
http://sacramento.craigslist.org/spo/2596901665.html

[74Dusted]

Or pick yourself up a Oxygen or Acetylene tank at a local Welding Supply company/shop if you want a Tall/Skinny tank for portable (and armored) use. They're rated for several thousand pounds of pressure. The only downside is they lack a drain on the bottom, and trust me you want to drain the water out of the tank regularly. Although, to be honest, you could always flip the tank upside down and drain the water out through the valve on the top and then refill it with air again.