The invention relates to a ventilation unit (1) for ventilating a liquid container (22) provided with a pouring opening, in particular beverage cartons, comprising: at least one piercing spike (2) that can be pierced into the liquid container (22), the one piercing end (3) which, when properly arranged the ventilation unit (1) is arranged on the liquid container (22) inside the liquid container (22), and a ventilation end (4) which, when the ventilation unit (1) is arranged as intended, is arranged on the liquid container (22) outside the liquid container (22), and has at least one ventilation channel (21) extending from the piercing end (3) to the venting end (4) and completely penetrating the piercing spike (2); and at least one closing unit (5) which is at least indirectly connected to the piercing spike (2) and which, in a closed state, closes a ventilation opening (20) of the ventilation channel...

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