change radiator valves ?

if you are very careful you can fit the TMV without having to drain down the entire system.
The back nut on the existing valve must be exactly the same size/type as the one thats on on the TMV to do this.
The system water needs to be cool so it can't be done with the heating up and working

garryk
January 2010

You will have to drain down and change the valve complete,you can't put a new hat on an old head.

Rich
January 2010