This is what you need to install the Robinair 18192 R134A Quick Connect Kit to the Yellowjacket I have used USA made Robinair quick couplers, the only problem is the quick couplers are 14 -mm threads which require a 14mm male brass thread. The coupler (FJC 6018) and Yellowjacket distributor hose require a 1/4" SAE male thread which is not included in any of these products. So this is what you need, to connect them together.
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