1/2” MI or FI is standard fitting. Other end can be any of the British pipe sizes.
I believe ( could be wrong) continental pipes are 8, 10, 12, 14, 16, have come across 18 too.
If you try it, 8mm will fit inside 10mm.
Had a coil of 20mm pipe. Soldered a 22 pipe stub onto it and then used standard fitting.
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