Hi Dougie,
Sorry for the delay but I'm under a V6 at the moment so have been able to take the measurements you wanted.
The ringed metal pipe (second photo) is 12.5 mm diameter.
The silver sleeve on the fluid hose is 19.5 mm diameter.
I hope this helps.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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