Didn't work for me but maybe my fault. According to the description, "most" R134a fittings fit. They don't fit my car. My 2012 Hyundai has a threaded connection but these caps are unthreaded, maybe just slide on but I'm not sure. I don't know the current standard for car air conditioners, but I think the description should state whether the caps are threaded or slip on.
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