Simplified metering pump

A metering pump comprising:

• (a) a main body having a first surface, (b) first means for attachment to a bottle neck, (c) second means for attachment of a dip tube, (d) an inlet valve, (e) a head, where said head has a second surface facing said first surface, and where said first surface and said second surface define a pumping chamber, where said head is made from a material having elastomeric properties adapted to be resiliently deformed by a manually applied force and has an external actuation surface adapted to be deformed by a user's finger, and (f) a discharge valve at the outlet of said pumping chamber, where said discharge valve includes a valve seat and a moving member adapted to move between a first position, corresponding to said closed discharge valve and in which said moving member contacts said valve seat, and a second position, corresponding to said open discharge valve, where said moving member extends from said head forming a partition, where said moving member is integral with said head, and where said first surface and said second surface are adapted to perform a relative movement therebetween causing the pumping of a liquid between said inlet valve and said discharge valve, wherein when said moving member is in said first position, and there is a reduced pressure in said pumping chamber, said reduced pressure then exerts a force pressing said moving member against said valve seat.