That was fast.. thank you for the ideas!Hi there I think you should go to some store selling either BBQs or to some store that specializes in accessories for craftsman like a roofer or something like that using gas in their work
You need two things is my guess:
First of all an adjustable pressure regulator, adjustable to 2.6 bar (we use on adjustable from 0-4 bar in Germany, I got one with a manometer so I can check the used pressure quite easily) and second a connector for the standard gas hose used in the US to a 3/8 left handed thread
The other possibility would be to buy not only a KB5 but a German pressure regulator and hose with left handed thread on both sides and add a connector to use the German regulator on US gas bottles
I hope my answer is helpful for your plan in purchasing a KB5