Before buying any parts, I'd try snugging everything up. As mentioned above there is the pipe nipple that holds the adapter plate on. The fittings may need to be loosened, cleaned, and properly tightened. They're pickier than most people realize, especially on the initial install. If over-tightened, the ferrule will not seal properly. Make sure everything is tightened to spec - too tight can be as bad as too loose. If that doesn't fix the leak, then start worrying about replacing parts.
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