I see that the "Remanufactured compressors come with the R12/R134A/1234yf required O-rings /sealing washers to install the compressor" I didn't know that there were O-rings compatible with both R12 and R134A.
"A better type of O-ring for air conditioning applications is HNBR which stands for Hydrogenated NBR (sometimes called Hydrogenated Nitrile, or Highly Saturated Nitrile Rubber, or HNB). The compatibility of HNBR with Mineral oil, PAG, POE, R-12, R-134a, R-1234yf is very good. Another advantage is that its temperature range is -22F to 302F. They are green in color."
