Hudson Reed Kristal Twin Concealed Thermostatic Shower Valve KRI3210 Product Details Thermostatically controlled. Built in anti-scald device. Separate controls for flow and temperature Suitable for water systems between 0-1 and 4 bar pressure. Suitable for combi boilers and gravity fed systems. Suitable for unvented mains pressure systems. Suitable for use with shower pumps. Manufactured from solid brass. Co-ordinated tap ranges available. Function Top handle – Water flow to single outlet Bottom handle – Temperature control This Thermostatic valve has been designed to be compliant with the requirements of TMV2 and is also WRAS approved. All Hudson Reed products are guaranteed for 10 years against manufacturing defects. Additionally we guarantee the surface finish for 10 years.