Redring cold water control pack consisting of an expansion vessel, a pressure reducing valve and a check valve, suitable for all plumbing installations requiring 15mm (1/2\" BSP) fittings. The brass Pressure Reducing Valve OPERATING PARAMETERS TBA. Expansion vessel (diameter 120mm x height 235mm) for use in plumbing installations requiring dedicated expansion where there is not sufficient hot water expansion available in the supply pipe work. The check valve can be installed in plumbing installations to manually open and shut off the incoming water supply, which is really useful for when water needs to be shut off for maintenance work. Universal use can be used with water appliances from any brand which require 15mm (1/2\" BSP) fittings.