1/2'' is too big. I don't understand how plumbing bits are measured because in real life it's about 16mm or 3/4/'' .
This is the same 15mm - 1/2'' coupler from your first link.
It's pretty mysterious to me too. I usually take the mystery bit to a plumbers merchant and they give me the bit I need and I can check it on the spot.
@Airhead started
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1/2'' is too big. I don't understand how plumbing bits are measured because in real life it's about 16mm or 3/4/'' .
This is the same 15mm - 1/2'' coupler from your first link.