Please note that the parts above are for the current Davos Tap from 2007 onwards. For your reference see below PDF, which includes details about spare parts.

Davos Installation Instructions / Tech Spec

See underneath Tap Parts Description to see / buy Tap Parts for Ascona Kitchen Tap.
Valve: Tap dripping from the Spout ? Guide to changing Valve here.
Brass Bush: Part surrounding the valve. More info here.
O Rings: Tap dripping where the spout meets the base of the Tap? Guide here.
Aerator: Found at the tip of the spout.