Device (100) connectable to a bottle (200) mouth suitable for closing the same and preserving the wine (150) therein contained, comprising:- an internal reservoir (101) for containing a predetermined quantity of inert gas under pressure having molecular weight greater than that of air- release means (102) suitable to introduce said inert gas from said reservoir (101) inside said bottle (200) to avoid degradation of said wine (150)- air escape means (103) suitable to expel the air inside the bottle (200) during the inert gas introduction in the bottle (200)- connection means (104) to said bottle (200) mouth suitable to avoid a detachment of said device (100) from said bottle (200) and to guarantee an isolation of the bottle (200) from the external ambient- charge means (108) configured to allow the filling of said reservoir (101) with said inert gas.
