as far as I know...The american side is a 1/2" (ID) (FPT) Female Pipe Thread
this might help you ..BOC sell the nut as a spare part..
Not all the time. I have a micromatic guage with 1/4' pipe thread left hand threaded. Good luck finding an adapter or a replacement. I know this from trying to turn it into a dual pressure system. I ended up adapting the gas connector 1/2" fpt to 1/4" fpt. With this adapter I made, I was able to connect the entire dual regulator to the output of a single regulatorIf it's a US thread they are clockwise to undo I believe.
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