  Argon gas valve. 
This is an ordinary high-pressure (up to three or four thousand PSI) gas regulator meant for gases other than oxygen.  I use it on an argon cylinder, so I'm listing it under argon, but mainly it's here to illustrate the general concept of high pressure gas regulators. 
Source: Claudin Welding Supply 
Contributor: Theodore Gray 
Acquired: 16 October, 2009 
Text Updated: 18 October, 2009 
Price: $40 
Size: 8" 
Purity: 0%
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