AUDAC WB3102/FS Flush-Mount Wall Box for VC3xx2, Solid Wall

Solid walls need a back box that is chased in, not one with spring clips that grab plasterboard. The WB3102/FS is that box for AUDAC's VC3xx2 volume controllers: recessed into masonry so the controller finishes flush against the wall face.

It is the solid-wall counterpart to the WB3102/FG. Order the right one at specification time; swapping them after the wall is made good is not a small job.