Abstract: S-shaped opening and closing element for controlling the flow of a fluid or body (powder, granulate) and adaptable to any form of package or fitting containing fluids, characterized in that its shape in two S-bends permits both an instantaneous stoppage of the flow of the fluids and an instantaneous flow of said fluids; this, as a function of the given position, by manual or mechanical traction on the element. The S-shape ensures very effective fluid-tightness, without supplementary elements. The opening and closing element can be employed for controlling flow from a container having a supporting device for the element. The container can have more than one compartment.