Counter Top Basins and washbowls and a designer feature to your bathroom. Counter top basins are installed on a flat surface, either a furniture worktop or a shelf, and give a focal point to a bathroom as well as still being practical. Counter top basins are also known as sit on basins ior sit on washbowls. Many counter top basin require either a counter top tall basin tap or a wall basin tap but come counter top basin feature a tap hole. Many counter top basins do not have an overflow hole or option and you will require an unslotted basin waste.