What is a combination radiator wrench or key?
The parts of a combination wrench/key are:
This is another type of multi-purpose key for working on radiator valve tails, bleed plugs (but not bleed screws) and blanking plugs.
It fits the integral external nuts on some 1/2 inch radiator valve tails...
...the 1/2 inch square sections of some bleed plugs (as seen here) and some blanking plugs...
...and the internal hexagons of 1/2 inch valve tails.
This type of wrench is usually made of hardened steel for strentgh and durability.
For step-by-step guides to some of the things you can do with this key, see:and