Tellus and the Nilfisk GA72 and the and the and the and the and the and the and the and the three phase industrial vacuum cleaner dust container female 50mm steel bayonet kit.
This is for the 50mm bayonet, for the 50mm conductive rubber vacuum hoses to be connected to the vacuum cleaner.
It can be seen in the photo on the front of the machine, the round opening below the Nilfisk name plate.
At the moment standard postage within Australia is capped at a maximum of $25 so maximise the saving on postage and buy some of the other related parts below!