Hi guys.
I recently bought a Futurmat Ariete 1 gr AV and I would like som input on the manual fill system.
How does the knob (lower left hand side of the machine) and valve (under the drip tray) work?
When and for what is manual fill good for?
How can I tell if the knob and valve is turned of?
Valve looks like this black one, center of picture:

Cheers, Alex