the invention is an atomizing pump for dispensing a quantity of liquid in a fine spray . the pump mechanism is constructed entirely of plastic , including the inlet and outlet valves , the piston , pump housing , and spring . this construction allows the pump to be easily recycled . the pump can also be constructed using two biasing springs . the first spring is used only to return the pump piston ; the second spring is used only to bias the outlet valve . in this manner , the person operating the pump only presses downwardly against the force of the first spring , and not the second . as a result of this biasing arrangement , less actuation force is required .