NilfiskCFM 50mm industrial vacuum cleaner quick connect fitting. This allows 50mm floor tools to be used direct from a 50mm hose.
It has the quick connect fitting that allows the floor tool to swivel. In a similar way to the second and third photos, which I've used as an example.
I saw it as an effective method to repair the wand, SKU Z7-22122 should the quick connect fitting break.
At the moment, standard postage is capped at a maximum of $25 within Australia, so maximise the saving on postage and buy something in the related parts below!