Abstract: Apparatus for dispensing flowable particulate materials from a storage container while protecting the material from unnecessary exposure to ambient atmosphere through a double vapor control mechanism. The apparatus includes a funnel unit mounted below the container for receipt of particulate material therefrom. A flow control disc is mounted between the container and the funnel unit to control the flow of material into the funnel unit, irrespective of the head of material within the funnel. A hollow, moveable, metering bell, and moveable funnel outlet closure are mounted on a common reciprocable rod within the funnel and are normally seated between cycles to provide double isolation of the material from the ambient atmosphere.