Hi there, I need to change my 3 port valve. I am not sure where to drain the system from; can anyone advise from the attached picture of the valve installation?
why do you need to drain the system? the head is removable eliminating the need to drain, if however you need to drain to change body as well then simply drain the central heating at the nearest drain point remembering to manually open the 3 port to drain the coil and connecting pipework within the airing cupboard!