A device is placed upon a container that is sealed by a sealing element and filled with a liquid, the device allowing the liquid to be withdrawn. The device is provided with a penetration element with a hollow needle that is held in an unused position on a head section. The penetration element is held by guide elements on the head section so that the element can be pressed against the sealing element in a withdrawal position, in which the hollow needle penetrates the sealing element. At least one aeration channel is provided to equalize the pressure in the container during the withdrawal of the liquid, the channel running preferably along the hollow needle. The air sucked from the atmosphere enters the aeration channel via a filter. This prevents the contamination of the liquid and the latter can be withdrawn without the risk of a reverse flow.
