Radiator bleed key for older radiators Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[Kittikat76]

Moved in to new house. Built in the 50s. Currently draining/clearing sludge from radiators upstairs. But they're old ones, different size bleed screw needed. Can someone please tell me which one I need? the valves are on the back of these single radiators. Thanks!

[stoneyboy]

Hi kittikat76,
A standard size key should be ok but you may need to file the end because some keys are internally chamfered which stops the key locating on the bleed bolt.
Regards S