To get a smooth look to the tiled walls in the bathrooms we have used the Hans Grohe “I Box” system to enable the mixer units to be fitted and serviced from the front because rear access to the stud walls would have been difficult to organise.
The Hans Grohe system enables the “I box” to be plumbed up and pressure tested using the pressure test plate on the front (the white bit) before you fit the thermostatic mixer (for the shower) or mixer diverter (for the shower and bath). So all this can be done before the plywood wall is fixed into place and then tiled. You can see a helpful video on You Tube at http://uk.youtube.com/watch?v=EiW3NhMCd8Y
