Nilfisk Action and Action Plus Vacuum Cleaner On-Board Round Dusting Brush
Nilfisk Action A300 in RED Domestic Vacuum Cleaner and the Nilfisk Action Plus Vacuum Cleaner in Maroon as well as the Nilfisk Coupe and Coupe Neo vacuum cleaner on-board dusting brush.
This "round" dusting brush is found in the on-board tool compartment. It's ovular in shape as photographed, and has an internal 32mm neck diameter.
At the moment, standard postage is capped at a maximum of $25 within Australia, so maximise the saving on postage and buy something in the related parts below!