we these typically integrated in some manner as all the basin wastes don’t appear to include the overflow. It seems different to the bath waste - which does include the overflow mechanism
Depends on the basin design. Some basins don't even have an overflow !!
Most ceramic basins have an overflow built into the casting ,and you would use a slotted waste fitting. Some "designer " type basins have an overflow set up much like a baths ,with a tube linking into the waste fitting.
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