Quote: (Originally Posted by
lancsman)

Is there any issue with O2 compatability or is it just a cost issue that has made ISC go with an other manufacturer?
Mark
IMHO, probably a cost issue, as Swagelok product is expensive. All components (from both mfg) are likely 02 compatable or ISC wouldn't use them. Undoubtably <most> users have had no problems with the QC4. I did, and subsequently have had no leaking at the fitting connections since the retrofit. If I get a chance, I will post comparative pics showing the obvious differences later tonight.