A delivery device for coupling to the mouth of a container, for controlled delivery of fluids and/or flowing substances, includes an inlet opening, an outlet opening and a substantially “S” shaped delivery path connecting the inlet and outlet openings. The path includes a first conduit having one end corresponding to the inlet opening within the container, a second conduit, communicating with the first conduit, and a third conduit, communicating with the second conduit having one end corresponding to the outlet opening. The first and second conduits are ring-shaped, the first conduit externally embraces the second conduit and the second conduit externally embraces the third conduit, the first conduit being subdivided in a plurality of channels. A ring-shaped chamber surrounds the first conduit, and a ring-shaped stop element for the inlet opening, forms a ring-shaped fourth conduit communicating with the inlet opening and the first conduit, together forming a two-curve path.