Abstract: Apparatus (1) for the introduction of air into enteral containers (2). A valve (14) is provided in a connection member (4) connecting the enteral set with the container (2) containing the enteral liquid and controls the introduction of air corresponding to the consumption of the enteral liquid. The valve (14) may include an oleophobic filter material that covers the air inlet (16) projecting into the connection member (4). The valve (14) on the side facing the container (2) is provided with a cutting device (20) for the foil closure of aluminum or plastics closing the container (2) in its initial delivered state. The cutting device (20) may be a circular or partly circular projection (28) rising from a low side (30) to a high side (32).