It consists of a graduated bottle with a particular rubber overlapped by a metal T from which emerge two connectors, one to the right and one to the left, both equipped with cock. On both there are two rubber tubes. The left connector is linked to the inhalator ally a big syringe), the right connector is linked to a cannula needle. The air in the bowe is inhaled by the syringe and the left bottle is closed. After the introduction of the needle in the pleural cavity, the two connectors are opened and the air or the liquid is moved for the decompression in the bottle.