An Allen key (size 5) is required to remove the drain plug.
3.2
Assembly
3.2.1
Replacing the sealing element
Do not use pointed or sharp-edged objects to remove the
sealing element. They may damage the sealing element or
the bead.
Remove the sealing element from the bead.
Insert a new, undamaged sealing element into the bead.
Ensure that the complete sealing element is in the bead.
Removal drain plugs
Removing the sealing element
Inserting the sealing element
Handling
Easytop circulation regulation valve S/E with SC-Contur
19 from 27