Connector for a bag containing liquid solutions for medical and nutritional use

A connector applicable to a bag containing liquid solutions for medical or nutritional use, comprising a coupling part for coupling to an end of a small tube projecting from the bag, the coupling part containing an axial hole closed by a pierceable inner membrane, and a closing part placed to close the end of the axial hole and detachable from the coupling part, wherein the coupling part comprises two coaxial tubes which define an annular inner space therebetween, into which an end of the small tube is insertable by axial pressure, wherein the annular inner space extends axially with a constant cross-section, and the coupling part and the closing part form a single body provided with a frangible weakened section for the detachment of the closing part from the coupling part.