Nilfisk GU350 and GU450 Upright Vacuum Cleaner Handle Height Adjuster Button
Nilfisk GU350 upright vacuum cleaner and Nilfisk GU450 upright commercial vacuum cleaner handle adjustment locking button It allows the handle to be locked in 2 positions. It's a different mechanism to the GU350A upright commercial vacuum cleaner and GU450A upright commercial vacuum cleaner which isn't adjustable.
In the photo, it's the tiny grey dot in the centre of the hank of cord.
At the moment, standard postage within Australia is capped at a maximum of $20! Maximise the saving on postage and buy some of the related parts below, such as a new hose, and a new filter or a new floor tool or round brush.