And yes, there's no JG 5/16" OD to 3/8" BSPP flat, which is the magic part you need.
I hereby declare that the John Guest PM450813E fitting to be The Correct Fitting™ for Swiss Flow to 8mm EVABarrier tubing.
There is still a "cone" (maybe better called an internal collar to locate the washer) and I just don't care enough to figure out why this is better than the DMfit one. "It just is."
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