Hans Grohe Imodul 13615180 Assembly Instructions Manual page 45

Thermostatic mixer
Install water pipes for body showers with a
gradient.
If you decide to install up to 3 further body
showers and not use the outlets on the panel
these must be sealed with a plug. However the
connection of up to 9 body showers is possible.
stop valve ¾"
Thermostatic mixer
8