Abstract: A motor actuated piston pump assembly is mounted in a housing which is detachably connected to a container closure having a diaphragm pump-spray nozzle assembly mounted thereon. The piston pump actuates the diaphragm pump-spray nozzle assembly for dispensing liquid from the container, the piston pump and diaphragm pump being constructed and arranged so that the piston pump does not become contaminated by the liquid being dispensed and thus can be detachably connected to other containers having similarly mounted diaphragm pump-spray nozzle assemblies for successively dispensing various types of liquids.