of the liquid on the breathing circuit walls to this end nebulizer apparatus 10 may be inserted in the breathing circuit between y connector 20 and patient limb 22 as shown in fig1 the construction of a nebulizer apparatus suitable for use with the liquid reservoir of the present invention is shown generally in fig2 nebulizer apparatus 10 includes adapter 30 for connecting the nebulizer apparatus in patient limb 22 of breathing circuit 12 housing 32 is mounted in adaptor 30 in a manner to permit the housing and other portions of the nebulizer apparatus to be removed from the adaptor for cleaning when changing drugs or for other purposes housing 32 contains opening 34 through which nebulized liquid may pass a vibrating element 36 such as a piezoelectric element is mounted in housing 32 the central portion of the vibrating element comprises a mesh plate 38 containing a holes 40 holes 40 may be formed in plate 38 by an electro forming process that produces hose having a diameter of preferably approximately 2 15 u03bcm in diameter vibrating element 36 may be energized by high frequency alternating voltage provided in conductors 42 plug member 44 is placed in the cavity defined by housing 32 plug member 44 has a central opening 46 through which liquid to be nebulized.