This is an old video, but if anyone is here - What is that "rough-in" , round box, in the wall, that the shower arm will screw into (up high, center) ? I never seen one like that here in USA.
Grohe Rainshower Universal rough-in box. I am pretty sure there are two, and they look exactly the same but one is unrestricted flow, other one is the restricted ecojoy BS. I am not sure which is which, even the catalogue numbers are similar but it's important to find out which is which if you don't want the "ecojoy" as there's nothing joyful in that.
