Abstract: A dispenser that also serves as a closure for transportable containers is described. The dispenser includes a trigger or other similar mechanism in which air must be admitted back into the container, usually by way of aperture. An insert is fitted into the aperture, with one or more tortuous paths circumscribed around the insert so as to permit air flow while simultaneously impeding and effectively preventing liquid from flowing out of the aperture when the container is inverted or otherwise rotated numerous times beyond its intended dispensing position (e.g., as might occur during transportation).