Abstract: A dispenser unit comprising a dispenser can and a dispenser head which is provided with a delivery tube. The delivery tube has a longitudinal section with a lumen tapering in flow direction and a tube-like extension having an approximately constant inner diameter which corresponds to the smallest diameter of the adjacent section with the tapering lumen. A plug whose cross-sectional dimensions correspond to the lumen of the extension so that the discharge tube can be sealed by receiving the plug in its discharge opening. The length of the constant diameter extension is so chosen that in case of clogging small sections of the extension can be cut off to reopen the delivery opening of the delivery tube.