Thermostatic Shower Mixer Valve - Exposed. Great value bar type shower mixer. Purchase with either exposed or concealed shower brackets & shower handset/rail for a complete shower at unbeatable prices!!! Minimum operating pressure 0.5 bar. Maximum operating pressure 10bar. Safety block at 38 degrees C. Offset connections allow for this unit to replace just about all makes of exposed thermostatic mixer showers as a direct replacement.