This is the mounting rod the Flamingo back extension fits onto. The rod goes into the back of the chair and carries the extension at the right height and the right angle, so the added support sits where the seating intends it to.
You need it whenever a back extension is being added to a Flamingo that does not already have one fitted. It is a small part, but the extension will not mount without it, so it is worth checking before the order goes in.
It is an R82 part made for the chair, so it holds the load properly and stays put in a wet bathroom.
