Just guessing & maybe a welder or other professional that deals with high pressure gas can chime in, but I wouldn't be at all surprised these things are fairly generic, like some refrigerators or washer/dryers. Only several actual manufactures producing them & rebranding/naming for the various companies that distribute them. Brass, guages, springs & valves should pretty well sum up the internals of most regulators. In any case, never a bad idea to hear what folks' experience has been with various brand names & the support for their product.
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