Abstract: A metering dispenser for a bulk material container, wherein the metering dispenser includes an adapter which is connected to the bulk material container. The adapter has an inlet opening which is in communication with a delivery conduit. A rotary slider having a metering chamber is rotatably mounted about a rotational axis which is disposed through the adapter and/or the delivery conduit. A tang is mounted on the rotary slider, eccentrically with respect to the rotational axis. The tang is used to engage the rotary slider between a first position wherein communication is open between the inlet opening and the metering chamber and wherein communication is closed between the metering chamber and the delivery conduit, and a second position wherein communication is closed between the inlet opening and the metering chamber and wherein communication is open between the metering chamber and the delivery conduit.