Abstract: A hand held, single use, gas mixture discharge unit is provided for existing nebulizers to enable them to be adapted for use as a portable gas flow source for a nebulizer. The nebulizer includes an external downwardly extending base having a gas conduit extending therethrough for connection to a standard oxygen delivery tank, or to a hand held gas mixture discharge unit where it operates a valve in a controlled manner to deliver accurately metered quantities of nebulized liquid type medication to the patient, in substantially any circumstance.