This is a Nilfisk tapered grey hose as fitted to the Nilfisk GD1010 series and the Nilfisk GD1005 and the Nilfisk GD1010 and the Nilfisk HDS2000 commercial vacuum cleaner but without the plastic bent tube with the sliding suction regulator in the top left of the photo.
We don't usually stock this part and suggest you buy the complete hose version SKU 12018001 or SKU 147-0765-510
At the moment, standard postage is capped at a maximum of $30 within Australia, so maximise the saving on postage and buy something in the related parts below!