In an earlier contribution to this discussion,
Brian Sharrock wrote:

"Christian McArdle" wrote in
message .. .
Ideally, you should remove the thermostatic head *before* draining
the rad, and replace it with a screw-cap which should have been
supplied with the valve for this very purpose. That will hold the
pin firmly down whatever the temperature.

Also, some designs feature a genuine "off", where you twist another
quarter turn after passing the "0" frost setting.

Christian.

IF the valve doesn't have an 'OFF' position, place a penny under the
thermostatic head and over the pin- then the * = Frost setting will
positively close off the valve.


But bear in mind that fact the the radiator has *already* been removed - so
removing the head at this stage in order to insert packing will result in
the valve opening, and peeing forth lots of dirty brown water!
--
Cheers,
Roger
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