This adapter kit allows you to charge the R-1234yf system with the current R-134a gauge kit. It works great when using R-1234yf cylinders, but if you want to use R-1234yf cylinders, you need to buy a reverse thread ACME adapter separately to mount it on the cylinder. The rest works great. A little remark. If you are unfamiliar with R-1234yf, the system pressure and behavior are almost identical to R-134a.
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