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Thanks newboy for the reply yes i am changeig the valves so i will try one side at a time...................... :oops: if the worse comes to worse flow and return pipes which would i use to drain ?

Hello to all you super people, well I have a bit of a predicament, I am in the process of changing a radiator in the upstairs bathroom for a towel radiator. I am scared to death to drain the system as we have been here 18 years and its never been done the system consists of a glowworm boiler...