At GROHE we know that creating a sensational shower involves more than looks alone. Water gives life to your shower, so how you choose to control the water makes all the difference. This volume control rough in gives you the freedom to design your spa shower exactly as you please. Featuring GROHE TurboStat technology delivers water at a desired temperature within a fraction of a second and keeps it constant for the duration of the shower technology, the shower thermostat responds within a fraction of a second to any changes in the incoming water supply. Constantly readjusting the balance of hot and cold water to ensure the temperature you select at the start of your shower remains constant for the duration of your shower.