Nilfisk Compact C120 and C220 and C330 vacuum cleaner hose, bent tube with a red sliding suction regulator. It's pictured on the top left of the picture of the complete hose.
It's no longer available, 21640503 will fit, it's the same excellent quality, however, it's in grey.
As it's light, maximise the saving on postage and buy some of the related parts below, such as dustbags and the filters or a new floor tool.
At the moment standard postage within Australia, is capped at a maximum of $20!