Yes, there are different fittings for ALL alternative refrigerants.

Regardless of the REASON that these fittings were made to be required, it is STILL a violation of FEDERAL law to convert a motor vehicle to an alternative refrigerant without using the correct fitting for that refrigerant. This is clearly spelled out in the EPA regulations and if I remember correctly is on the 609 test.

I sure would not want to try to explain to a Federal judge that the reason I did not abide by Federal law is that the law was conceived to aid a certain group. I don't think that very many attorneys would recommend that as a viable defense.

Best of luck,