Brass radiator key
A radiator key is a Size 10 clock key.
The keys you usually get free with radiators are small aluminium size 10 clock keys. If you find you are struggling with the free key, consider the following options:
- an actual size 10 clock key (see item above, select size 10)
- this key, very small, good if the valve faces a wall and you don't have enough space
Click here for a conversion chart to convert millimetres to Key Size.