The Violet concealed thermostatic shower valve has a unique stylish design giving your bathroom the more modern look the thermostatic shower valve is convenient and safe to use. The top dial controls water 2 outlet diverter and the bottom dial control the water temperature, we understand that safety has to be a first with our products hence why the Teslie thermostatic show mixer valve are fixed with thermostatic control, hence why the Violet thermostatic shower mixer valve is fitted with a safety button, pre-set to 38 degrees, which prevents any accidental scalding temperatures.