Group, I now have on the web site the Variable orifice valve ( VOV ) I listed a few of the pluses about them over the standard valve. They work with R12 or R134A and they state there has been over 2 million miles of testing. My distributor told me when I picked them up this morning that shops in Arizona and other hot climate really like them and don't use anything else. I will be adding more about them tonight, but don't wait up. Look under AC. John Hervey www.specialtauto.com To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/