Grohtherm SmartControl Triple-Function Square Thermostatic Valve Trim with Control ModuleChoose a thermostat that is as flexible as possible for your most enjoyable shower or bath ever. Packed with useful features, the Grohtherm SmartControl triple function concealed thermostat features a minimalist design that will enhance any modern bathroom. The innovative SmartControl technology allows you to select your desired spray source and adjust the water volume at the push turn of a button. The three valves offer total flexibility, whatever