The nut that screws into the BOC Co2 Suregas bottle

[Darragh1980]

So I got a regulator off Aliexpress and the nut is just slightly too small. I think the nut is 13 tpi and the gad bottle is 14tpi. Do any of you lads knpw where I could find a nut to replace it and can screw into the BOC gas bottle.
I don't know if it is a DIN 477 no.6 or a BS 341 no.8 screw.

[CH]

Buying cheap regs for the high pressure in boc bottles is never a good idea. Is you reg rated to handle the pressure?