Abstract: An adjustable amount of liquid is reproducibly withdrawn from a container having a pre-chamber in free flow communication with the interior of the container. The pre-chamber is initially filled with an amount of liquid from the container and is in communication with a measuring chamber. The measuring chamber has an adjustably pre-set volume and is in communication with a closeable outlet. Thus, after the amount to be withdrawn from the measuring chamber has been adjusted, discharge of the preset volume is effected through the outlet without the necessity of additional manipulations such as shaking the container or separating the dosage metering part from the container to effect the discharge of a precise amount of liquid.