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There is no key its just a loop of flexible pipe that has an isolation valve on each end that is connected to the cold water and central heating pipes. Jon

Thanks, but I know how to fill the system its just that when I turn the valve nothing is happening which is a bit strange. Jon

Hi I have a Worcester boiler for my central heating and hot water. I am trying to add water to the central heating. The system has a loop from the cold water into the central heating pipe. There are isolating valves on each end. I added water in the past by just turning the valve near the...