Jason,
Mary wasn't very clear in her question, and I may have a better answer for 
her if she is referring to R134A refrigerant.  I am new to this echo, but 
wish to offer helpful knowlege I've aquired through automotive regulations 
regarding our environment, so long as they haven't changed since I've posted 
this .
If I can be of assistance, ask away folks.
Jaime
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