Nope the hoses and O-Rings are different as well. The new hoses are a Barrier hose. They are a rubber hose that has a Teflon inner hose liner. That is because the 134A has smaller atoms than the R-12 and can actually pass through the R-12 hoses unless they have been in use a long time, then the oil itself seals the hoses. Also different are the O-Rings, standard R-12 ones are not compatible with the oil used in R-134A, they break down and leak unless they have also been in use for a long time. For the guys who just put R-134A into a R-12 system you are just using the R-134a to displace the missing R-12. If you are real lucky it will work,however it is not the correct thing to do. Kind of like throwing masking tape over a rust hole, yeah it works but it isn't correct.
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