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Further to my other thread about broken drain cocks. I have drained down my system as completely as i can (potterton puma 80 combi) as the drain has been open all day. The drain is on the 'CH return' pipe directly under the boiler. I have disconnected the 'CH return' pipe from the mains water supply (;i.e. removed the flexi pipe) and closed the valve between the 'CH return' and the 'CH flow' yet when i cut into it to remove the soldered in drain cock water starts to flow, admittedly not much but then i've only made a small hole. The flow is slowing but it is still flowing. Is this just left over water in the system? Is it safe to carry on cutting or am i going to get drowned?
Help!!
Help!!