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A cover (1; 100; 200) for containers (C) used in the accumulators manufacture, comprising a main body (2; 101; 201) for closing the container (C), provided with a plurality of first through holes (2b; lOlb) for supplying the electrolyte, at which a shaped cap (3; 102; 202) raised from the upper wall (2a; lOla) of the main body (2; 101; 201) is formed. The main body (2; 101; 201) and the shaped cap (3; 102; 202) are two separated pieces connected through joining means (4:103; 203). (FIG.1)