I'm trying to replace the cold tap valve on a Franke Ascona mixer tap.
The valve is slightly recessed in a non removable shroud. The new replacement valve fits a standard 14mm socket set which I can use. However the existing valve I am trying to remove has rounded sides which prevents the socket set from attaching.
I have tried an adjustable spanner but because of the shroud I can't get enough leverage to undo the valve. How can I remove this valve?