Nilfisk GWD350 and the Nilfisk GWD350/2 and the Nilfisk GWD375/2 as well as the new Nilfisk VL500 75-2 Ergo large commercial wet and dry vacuum cleaner black 40mm wand. Two are needed for a set, they're similar to the picture but they have a black plastic friction ring.
For a cheaper option, choose Pn. 107407337
At the moment, standard postage within Australia is capped at a maximum of $20!