Abstract: A tube apparatus for outlet of liquid from a container, adapted to receive at least two different fluids with intermediate interface(s), where liquid outlet openings are located above and/or underneath the interface(s). At least one tube member is adapted to have a substantially horizontal position in the container and is provided with at least two liquid outlet openings. A collecting tube communicates with each tube member and serves to lead liquid out of the container. Immediately under and/or over each liquid outlet opening there is provided a plate-shaped flow control element which extends approximately horizontally in all directions with respect to the liquid outlet opening concerned.