Caleffi 22mm Cold Water Control Valve 3-6 Bar comprises of a manifold containing a pressure reducing valve, a cold water balancing port with check valve, a check valve and a preset pressure relief valve. The unit can be installed either horizontally or vertically with the PRV always first in line. Specially designed for hot and cold services in houses or apartments Equalises the hot or cold water supplies or both Prevents excessive pressure at outlets such as taps and showers Specially shaped diaphragm to give accurate pressure regulation in response to changes in downstream pressure. The larger outlet chamber creates a low exit velocity which is effective in reducing water noise. The control stem housing of the cartridge is made from a plastic material with a low co-efficient of adhesion. Reduces scale deposits forming, the main cause of pressure reducing valve malfunction.