Hudson Reed Traditional Twin Concealed Thermostatic Shower Valve A3099C 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 All Hudson Reed products are guaranteed for 10 years against manufacturing defects. Additionally we guarantee the surface finish for 10 years.