Abstract: A device for connecting at least a feed off and return tube to a bung-hole of a container for liquids and the like having threads at its inner periphery, said device comprisinga cylindrical insert having threads at its outer periphery co-operating with the thread of the bung-hole, and a bottom part provided with at least two orifices,a tube mounting having a lower surface to be placed on the bottom of said insert and provided with ports being in communication with said orifices of the insert, anda clamp means to clamp said mounting into said insert,wherein the tube mounting and the insert are provided with lugs and co-operating recesses located according to a certain pattern, wherein a recess is arranged in the wall of an orifice debouching in the bottom of said cylindrical insert, and the co-operating lug protrudes axially out of the tube mounting or vice versa, such that with only two lugs a large number of coding possibilities is provided for.