A device for dispensing and receiving a liquid or semi-liquid product via a metering chamber of a pump body. The device includes a piston which is fixably mounted in the pump body and is provided with an end sealingly engaged into the chamber. The piston end is provided with an elastically deformable...http://www.google.fr/patents/US7866513?utm_source=gb-gplus-shareBrevet US7866513 - Liquid product dispensing and receiving device
