> The green o-rings are not teflon. They are actually made for
> the air
> conditioning industry and are available from A.C. supply houses.
Apparently a material known as HNBR, also as "high temperature Buna-N". Has
good resistance to Freon, particularly R134a (which will eat neoprene).
I still don't know the proper dimensions offhand, but it looks like a box of
100 is about $4 from MMC.
http://www.mcmaster.com/#hnbr-o-rings/=7ldhyv
Randall
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