Nilfisk-Alto PET Filter Cartridge Attix 751-11 Vacuum Cleaner See 302000490
WAP by Nilfisk-Alto PET washable pleated filter cartridge for the Attix 751-11 industrial wet and dry vacuum cleaner USE Pn. 302000490
The cartridges dimensions are 140mm high. The major external diameter of the blue ring is 185mm, and the internal diameter of the blue ring, 140mm.
I've used a photo of 302000490 which has more pleats, to illustrate this Class L Filter.
As it's light, maximise the saving on postage and buy some of the related parts below, such as a new hose, and some dustbags or a new floor tool or a round brush.
At the moment, standard postage within Australia is capped at a maximum of $20!