DE926087 - Desider Stern - Patent appliance for preparing drinks - Part 6

Now you screw "The brain" filled with the coffee on the water tank:

The black lines in the middle of the machine (numbered 6 if you turn your head) is the seal.
So the pressure room is tight, no water will leak...

... because ...

Now you have to flip the machine and place it on the Jug:

Like this: