A dispensing pump comprising: a base portion having a bottom wall and an upwardly extending sidewall, said bottom wall including a centrally located entrance orifice, said base portion further having a flow conduit extending upwardly from the inner surface of the bottom wall and surrounding the entrance orifice; an inlet valve received within the entrance orifice, said inlet valve being slidably movable between a normal closed position where the inlet valve is seated within the entrance orifice and an open position where the inlet is unseated from the entrance orifice; a piston valve having a lower end received within the flow conduit, an upper end and an outlet opening adjacent the upper end; a cup spring having an annular upper wall and a downwardly depending outer sidewall, said cup spring further including an inner piston wall extending downwardly from the upper wall, said base portion including at least two opposed spring ribs (39A, 39B) extending upwardly from the bottom wall, said cup spring being received within the base portion such that the upper end of the piston valve is concentrically received within the inner piston wall, the outer surface of the inner piston wall is disposed concentrically within the flow conduit, and the outer sidewall of the cup spring is seated on the spring ribs, said upper end of said piston valve engaging and cooperating with said inner piston wall to form an outlet valve, said piston valve being slidably movable within the flow conduit and within the inner piston wall; a guide structure having a top wall and an outer sidewall depending downwardly and outwardly from the top wall, said guide structure being received within the base portion wherein the terminal outer edge of the outer sidewall is slidably received within the outer sidewall of the base portion, said guide structure being slidably movable within the base portion; and a pump actuator having a top wall, sidewalls and a dispensing orifice, the pump actuator being received over the guide structure and within the base portion where the dispensing orifice communicates with the outlet orifice of the guide structure, said pump actuator being slidably movable within the base portion, whereby forcible downward compression of the pump actuator causes a deformation of the cup spring over the spring ribs and forces material within the flow conduit to flow out of the dispensing orifice, and whereby upon release of the pump actuator the cup spring elastically returns to its normal at-rest shape and draws material into the flow conduit through the inlet orifice. a base portion having a bottom wall and an upwardly extending sidewall, said bottom wall including a centrally located entrance orifice, said base portion further having a flow conduit extending upwardly from the inner surface of the bottom wall and surrounding the entrance orifice; an inlet valve received within the entrance orifice, said inlet valve being slidably movable between a normal closed position where the inlet valve is seated within the entrance orifice and an open position where the inlet is unseated from the entrance orifice; a piston valve having a lower end received within the flow conduit, an upper end and an outlet opening adjacent the upper end; a cup spring having an annular upper wall and a downwardly depending outer sidewall, said cup spring further including an inner piston wall extending downwardly from the upper wall, said base portion including at least two opposed spring ribs (39A, 39B) extending upwardly from the bottom wall, said cup spring being received within the base portion such that the upper end of the piston valve is concentrically received within the inner piston wall, the outer surface of the inner piston wall is disposed concentrically within the flow conduit, and the outer sidewall of the cup spring is seated on the spring ribs, said upper end of said piston valve engaging and cooperating with said inner piston wall to form an outlet valve, said piston valve being slidably movable within the flow conduit and within the inner piston wall; a guide structure having a top wall and an outer sidewall depending downwardly and outwardly from the top wall, said guide structure being received within the base portion wherein the terminal outer edge of the outer sidewall is slidably received within the outer sidewall of the base portion, said guide structure being slidably movable within the base portion; and a pump actuator having a top wall, sidewalls and a dispensing orifice, the pump actuator being received over the guide structure and within the base portion where the dispensing orifice communicates with the outlet orifice of the guide structure, said pump actuator being slidably movable within the base portion, whereby forcible downward compression of the pump actuator causes a deformation of the cup spring over the spring ribs and forces material within the flow conduit to flow out of the dispensing orifice, and whereby upon release of the pump actuator the cup spring elastically returns to its normal at-rest shape and draws material into the flow conduit through the inlet orifice.