being elastically urged to form a seal against a profiled rim projecting from the base of the cup shaped body so preventing communication between one or more holes 119 provided in the base of the cup shaped body and the chamber 113 which is in direct communication with the aperture 114 it is not necessary to describe the operation of the pump of fig5 it being the same as that of the pump shown in fig1 4 in the pump shown in figs from 1 to 4 the liquid drawn through the dip tube 7 passes through the open free end of the hollow appendix 18 flows around the ball 20 and then rises above the ball 20 to enter the intake chamber 8 the liquid takes an identical path from the dip tube to the intake chamber in the pump of fig5 in both cases however the free end of the pump hollow appendix on which the dip tube is sealedly mounted could also be closed while achieving the same result for example with reference to fig6 and 7 which show only the end portion of the pump of fig1 4 it can be seen that the end portion of the tubular element 17 the same reference numeral is used as already used in fig1 4 to clarify the understanding of this variant without illustrating the structure and operation of the entire pump which is exactly as.