Device for dispensing a fluid, comprising means for coupling it with a container holding said fluid and comprising: - an outlet duct for said fluid; - at least one collapsible chamber suited to receive a given quantity of said fluid and at least partially defined by an elastically yielding portion of an actuator element suited to actuate said device; - first valve means suited to control the passage of said fluid from the inside of said container towards said chamber; - second valve means suited to control the passage of said fluid from said chamber towards said outlet duct, wherein at least one between said first valve means and said second valve means comprises a movable element belonging to said actuator element, the device further comprising air refilling valve means suited to control the passage of a given quantity of air from the outside of said container towards the inside of said container, the device further comprising a supporting structure comprising said means for coupling it with a container wherein said air refilling valve means comprise at least one flexible portion of an edge belonging to a first element of said device associated with said supporting structure, said flexible portion being suited to assume a closed position intended to prevent the passage of air from the outside of said container towards the inside of said container and suited to assume an open position intended to allow the passage of said quantity of air from the outside of said container towards the inside of said container, the device further comprising a second element associated with said first element, said second element comprising a counteracting element suited to push said flexible portion in order to move said flexible portion from said closed position to said open position, wherein said counteracting element is suited to assume a first rest position in which it does not counteract said flexible portion in said closed position and an operating position in which it pushes said flexible portion and places it in said open position, characterized by the device further comprising a third element associated with said second element, said third element comprising a reference element suited to cooperate with said counteracting element in order to move said counteracting element between said first rest position and said operating position, wherein said third element is movable with respect to said second element in such a way that it can be positioned in a first position, in which said reference element does not cooperate with said counteracting element, and in a second position, in which said reference element cooperates with said counteracting element in order to place it in said operating position, wherein said third element can be rotated with respect to said second element between said first position and said second position. - an outlet duct for said fluid; - at least one collapsible chamber suited to receive a given quantity of said fluid and at least partially defined by an elastically yielding portion of an actuator element suited to actuate said device; - first valve means suited to control the passage of said fluid from the inside of said container towards said chamber; - second valve means suited to control the passage of said fluid from said chamber towards said outlet duct,