Patent ID: 8794128

Claim:
A device for performing a process of treating a liquid during which air is supplied to the liquid, the device comprising: a detachably arranged liquid treating unit; a basic part which is suitable for receiving and accommodating the liquid treating unit, wherein the liquid treating unit has an air restriction for letting air into the liquid treating unit during the liquid treating process, wherein the air restriction comprises a pin and a hole for receiving the pin, wherein the pin is rotatably arranged in the hole; and a rotating device comprising at least one element arranged on the basic part and at least one element arranged on the pin, with each adapted to be in moving engagement with each other causing the rotation of the pin within the hole around a longitudinal axis of the pin when the liquid treating unit is moved with respect to the basic part during removal of the liquid treating unit from the basic part and when the liquid treating unit is moved into an operational position in the basic part.