A connector for connecting a medical tube set to a medical container, includes a collar connectable to a container, a cap having at least one opening for receiving a tube of a tube set, and an annular seal. The cap is located in the collar between an inner surface of the collar and the seat. The cap is rotatable relative to the collar. The collar includes a generally cylindrical side wall open at its upper and lower ends and an annular flange projects inwardly from the side wall at the upper end. The cap has a disc defining at least one opening and having an outer annular rim which locates between a lower surface of the annular flange on the collar and the seal.
