Toilet basin hi-res stock photography and images - Alamy
This hand basin is a part of the toilet. When you flush the tap runs long enough to wash your hands and fill the cistern. : r/mildlyinteresting
http://www.toilet-with-sink.com/space-saving-wall-mounted-toilets -with-compact-hand-wash-basin.php | Small space bathroom, Small toilet room, Toilets and sinks
Source Bathroom ceramic toilet hand wash basins on m.alibaba.com