Sealing unit for a liquid container

A sealing unit for selectively sealing and opening a container liquid opening in a container configured to hold a liquid, the sealing unit comprising:

• a female sealing unit portion comprising:
• a tubular element comprising a liquid passage extending in an axial direction between an inner opening and an outer opening, wherein the tubular element is configured to be fixedly positioned relative to the container liquid opening so as to provide a liquid connection between the inner opening of the tubular element and the container liquid opening;
• a valve arranged inside the liquid passage of the tubular element, the valve comprising a tubular valve portion that is axially movable inside the liquid passage relative to the tubular element between a closed position in which the tubular valve portion closes the liquid passage and an open position in which the tubular valve portion leaves the liquid passage open, wherein the valve further comprises a valve skirt portion at a first side connected to or integrally formed with a circumferential surface of the tubular valve portion and at a second side connected to or integrally formed with the tubular element, and
• wherein the valve skirt portion comprises a flexible portion configured to bend when the tubular valve portion is moved from the closed position to the open position under influence of an external axial force exerted on a force receiving part of the tubular valve portion and to urge the tubular valve portion back from the open position to the closed position when the external axial force is removed, and
• wherein the tubular element is configured to removably receive in the liquid passage a rigid operating tube of a male sealing unit portion, the rigid operating tube configured to be axially movable inside the liquid passage of the tubular element so as to engage the force receiving part of the tubular valve portion and apply the external axial force to open the tubular valve portion.