Discuss Central Heating Drain Down in the Central Heating Forum area at PlumbersForums.net
There is a drain off on the valve You need a hose to fit over the drain point run it to a drain , dust sheet down a tray to catch spillage , depending on the type of system it will need isolating , before loosening the air tap type pin in the valve push the hose on open up the air taps at high level rads first , then the lower ones till drained
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