Device and sanitary fitting for filling a container with a carbonated liquid

A device (1) for filling a container (2) with a carbonated liquid, containing at least: an upper part (3) and a lower part (4) having a container port (5) for securing the container (2) to the device (1), wherein the lower part (4) can be displaced within limits relative to the upper part (3) between a closed position (23) and a venting position (6), and wherein the container (2) can displace the lower part (4) to the closed position (23) when the container (2) is secured to the container port (5), and the container (2) can displace the lower part (4) to the venting position (6) when the container (2) is released from the container port (5), such that a high pressure in the container (2) can be reduced in the venting position (6) of the lower part (4) prior to releasing the container (2) from the container port (5).