A valve for use in connection with aerosol spacers to be mounted on a metered dose inhaler, characterized in that the valve comprises a frame portion (1) one end of which can be attached to the chamber portion of known aerosol spacers and its other end constitutes a mouthpiece having an air outlet...http://www.google.com/patents/US5724962?utm_source=gb-gplus-sharePatent US5724962 - Valve for use in connection with an inhaler apparatus
