Hi, I've been searching around replacing my mixer tap and all seems simple until I came to actually look at how the current mixer tap is secured to the basin. Does anyone have any idea how this thing is connected and how to disconnect it. I've tried Googling but no real idea what to search for to get the answer, nothing obvious came up. Picture attached of the fitting underneath, all help appreciated.
Sorry for the poor quality image but the file size allowed upload is quite small...
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