Abstract: A flow regulator for controlling the flow of material from a container is disclosed, wherein the container includes a container outlet through which the material freely flows when the container outlet is not closed. The flow regulator is biased in a closed position, but is moveable to an open position to provide for material flow from the container. The flow regulator may be progressively moved to permit varying degrees of material flow as the opening in the container is progressively opened. The flow regulator provides both a closure to obstruct material flow and a seal to preserve the container contents from outside contamination or degradation. The flow regulator is disclosed in combination with a bulk bin container to form a novel dispensing mechanism.