Device (10; 210; 210'; 310; 410; 410') for dispensing a fluid, suited to be applied to a container (C; C') containing said fluid, said device (10; 210; 210'; 310; 410; 410') comprising: - a collapsible chamber which defines a volume suited to receive a quantity of said fluid to be dispensed; - an inlet duct (62; 262; 262') suited to allow the passage of said fluid from the inside of said container towards said volume; - first valve means (66; 266; 266') suited to control the passage of said fluid into said inlet duct (62; 262; 262'); - an outlet duct (64; 264; 264'; 764) for said fluid suited to allow the passage of said fluid from said volume towards the outside; - second valve means suited to control the passage of said fluid into said outlet duct (64; 264; 264'; 764), wherein said chamber is at least partially defined by a first portion and a second portion mutually coupled with each other in such a way that together they define said volume and define said inlet duct (62; 262; 262') and said outlet duct (64; 264; 264'; 764), wherein said first portion comprises an area suited to be connected to said container (C; C'), and wherein said second portion comprises an area suited to be connected to said container (C; C'), wherein said first portion and said second portion are equal to each other and mutually coupled with each other, and wherein each of said first portion and of said second portion comprise a tab (38b, 138b) and a passage opening (38a, 138a) and characterized in that the cooperation of one of the tabs and one of the passage openings implement said first valve means (66; 266; 266') and the cooperation of the other one of the tabs and the other one of the passage openings implement said second valve means (68; 268; 268'). - a collapsible chamber which defines a volume suited to receive a quantity of said fluid to be dispensed; - an inlet duct (62; 262; 262') suited to allow the passage of said fluid from the inside of said container towards said volume; - first valve means (66; 266; 266') suited to control the passage of said fluid into said inlet duct (62; 262; 262'); - an outlet duct (64; 264; 264'; 764) for said fluid suited to allow the passage of said fluid from said volume towards the outside; - second valve means suited to control the passage of said fluid into said outlet duct (64; 264; 264'; 764), wherein said chamber is at least partially defined by a first portion and a second portion mutually coupled with each other in such a way that together they define said volume and define said inlet duct (62; 262; 262') and said outlet duct (64; 264; 264'; 764), wherein said first portion comprises an area suited to be connected to said container (C; C'), and wherein said second portion comprises an area suited to be connected to said container (C; C'), wherein said first portion and said second portion are equal to each other and mutually coupled with each other, and wherein each of said first portion and of said second portion comprise a tab (38b, 138b) and a passage opening (38a, 138a) and characterized in that the cooperation of one of the tabs and one of the passage openings implement said first valve means (66; 266; 266') and the cooperation of the other one of the tabs and the other one of the passage openings implement said second valve means (68; 268; 268').