On Wed, 7 Oct 2020 18:12:41 +0100, Andrew wrote:

As others have said, if you have a header tank and don¢t want to mess with
crusty valves, stick a bung in the header tank outlet.

Tim


A carrot normally does the trick too.

Now that /is/ thread drift!
--
Peter.
The gods will stay away
whilst religions hold sway