central heating drain off valve

[greazer]

i am replacing rad in bathroom upstairs with heated towel rail so need to drain off central heating system but cant find any drain off valves on rads downstairs, the heating system is not fitted with a combi boiler, header tank is in loft, help please, thanks..

[stoneyboy]

greazer,
Securely plug the vent and feed pipe in the loft - eliminates the need for draining whole system down.
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