Abstract: The invention provides a pump of the type comprising a body (1) having a bottom portion for communicating with a dip tube (2) via an admission valve and a top portion for connection to the edge of a container (R) and itself containing a metering chamber (10) closed in leaktight manner on top by compression means provided with an exhaust valve and with a return member, and suitable for being actuated by manual thrust being applied to a dispenser head (T) provided with a delivery duct (C), the pump being characterized in that said return member comprises an elastically deformable internal diaphragm (3) carried by the dispenser head (T) and co-operating with a rigid cup (4) fixed beneath said head (T) and co-operating with said diaphragm (3) to define the metering chamber (10).

Abstract: A manual dispenser dispenses a liquid substance by pressure, and automatically closes in the absence of pressure. The dispenser has a push button for controlling an aerosol valve or pump, or a stopper for a receptacle having flexible, compressible walls. The dispenser is characterized in that it comprises a nozzle (3) with an elastically deformable distribution slot (7) which nozzle is integrated by molding into a relatively rigid body (1).