Blanco Mixer Taps?

Hiya
Just moved in to a new house which has a set of blanco mixers taps in the kitchen.... I seem to be missing something of the end of the fossest - to restrict flow or air-ate the water as it comes out.... found lots of small mesh disks about the size of a 5p piece on the side of the sink? Anyone have any ideas - whats the likely hood of getting a replacement plastic bit with these meshes in?