They do make some substitute fro T12.Just have to be careful as some of the cheap stuff did have propane benzyne etc in it.Its as pricey as R12.Basically if you can find 12 you cant buy it unless you have a cert.Its just easier to change to 134.Just replace the dryer and have a vacuum pulled along with the Orings.The new Orings are avaliable in all sizes.That and add some oil to the system.Rocky


Chrysler Firepower