What is a combination radiator wrench or key?

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    Parts of a combination wrench-key 
 Combination radiator wrench-key 

The parts of a combination wrench/key are:


  • Handle

  • Open-ended spanner

  • Hexagonal profile for fixing or removing valve tails

  • Square profile for fixing or removing bleed plugs and blanking plugs

  • A hole to give clearance to bleed screws when fitting/removing bleed plugs


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.

 Combination radiator wrench-key 

This type of wrench is usually made of hardened steel for strentgh and durability.

 Using combination wrench-key 

For step-by-step guides to some of the things you can do with this key, see: How to fit and remove blanking plugs and bleed plugs and How to fit and remove valve tails

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