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.
You can buy smaller adaptors that go to 15mm, i can't mind the size but it's like a euro size.
Toolstation or Screwfix im sure sold them and if they didmnt city plumbing will have them.
@konastab01 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.