WAP by Nilfisk-ALTO branded wet and dry vacuum cleaner pleated paper cartridge filter tension disc.
This retains the filter in position on the Aero400 and the Aero440 and the Aero640 and the Aero840 series wet and dry vacuum cleaner. The WAP brand of vacuum is very popular in the Republic of South Africa
It's dimensions are described as 185mm external diameter and 45mm from the top of the screw thread, to the bottom edge of the disc.
Please Note the photo is purely to illustrate the part, and will be updated once I have the part to be photographed. 17/05/2019
As it's light, maximise the saving on postage and buy a couple of filters, or some accessories such as a new floor tool or round brush or even a hose! See in related parts below.
At the moment standard postage within Australia, is capped at a maximum of $20!