https://www.wolseley.co.uk/product/siem ... me-plated/
It used to have a very slow drip. Now it has started to increase.
AFAIK, the screw fitting to the rad is as tight as I can make it. The drip seems to be coming from the air holes in the valve. (Remember that the valve is horizontal.)
Question: Is it easy to unscrew the rotating part without needing to unscrew the whole valve from the rad?
If yes, how do I do that? And how do I fix the leak?