A concealed thermostatic valve unit that provides a control system for overhead and slide rail shower units. The elegantly squared control surfaces are designed to complement similarly finished, traditional or minimalist shower units and enhance functionality. A straightforward and intuitive handwheel system enables precise control of both flow and temperature. The unit is constructed from high density chrome-plated solid brass, further accentuating the modern, design-driven visual of this stunning unit. A cavity of 75mm is required for satisfactory installation of the thermostatic control unit.