Metering unit for free-flowing solids

A metering unit for flowable solids comprising an outlet nozzle which is moulded from a first flexibly elastic material and has at a first end thereof an inlet opening, the inlet opening being designed for fixing on an outlet of a storage container, the outlet nozzle having at a second end thereof a slot-shaped outlet opening, the slot-shaped outlet opening being formed between two opposite sealing lips of the outlet nozzle and elastically preloaded in a direction of a closed position thereof and can be transferred against elastic preloading thereof to an open position as a result of compressive forces which act approximately in a direction of extent thereof, wherein the slot-shaped outlet opening of the outlet nozzle is elastically preloaded into the closed position by a separate clamp made from a second flexibly elastic material, the clamp being mounted releasably on an outer circumference of the sealing lips bounding the slot-shaped outlet opening, wherein legs of the clamp, which rest on an outside of the sealing lips in a mounted state, are elastically preloaded in a direction of a position in which the legs are close together and can be moved elastically away from one another as a result of the compressive forces which act approximately in the direction of extent.