respiratory portal 250 as shown in fig9 in contrast the one way valve 252 is closed during exhalation as seen at one point during the administration of opep therapy in fig1 when the deformable restrictor member 220 and the oscillation member 222 are in the disengaged position referring to fig1 the respiratory portal 250 of the opep device 200 is also configured to receive an aerosol outlet 260 of a nebulizer 258 the nebulizer 258 maybe removably connected to the opep device 200 by any suitable means for the combined administration of opep and aerosol therapies any of a number of commercially available nebulizers may be used with the opep device 200 one suitable nebulizer is the aeroeclipse u00ae ii breath actuated nebulizer available from trudell medical international of london canada descriptions of suitable nebulizers may be found in u s pat no 5 823 179 the entirety of which is hereby incorporated by reference herein in this configuration a user receives aerosol therapy upon inhalation as seen in fig1 when a user inhales the one way valve 252 opens and an aerosol medicament is drawn from the aerosol output 260 through the respiratory portal 250 and the chamber 208 and into the respiratory system of the user in contrast opep therapy is delivered upon exhalation as seen in fig1 when a user exhales the one way valve.