What is a radiator spanner and air release key?
The parts of a radiator spanner and air release key are:
The handle can be the short or long shaft, depending on what radiator part is being adjusted.
The handle can be smooth, like this, or the hex shape can be continued along the length of the tool.
The short end of the tool doubles as a key for internal hexagon valve tails and and internally lugged valve tails by means of the grooves on opposite sides.
At the other end is a bleed key for standard 5mm square-headed bleed screws.
These keys are usually made from zinc-coated or galvanised mild steel or high tensile steel.
High tensile steel is the best option when removing or fitting valve tails as quite a lot of pressure might be required.
High tensile steel is much stronger than mild steel and will not distort or break easily.
The combination of bleed key and valve keys is handy because you need to bleed a radiator after replacing valve tails.
For step-by-step guides to using this and some other keys, seeand