The invention relates to a stopper (3) intended to be attached to a container (2) for sealing the latter, and comprising a base (5) intended to be attached to the container (2), a spout ( 7) pourer extending an opening (4) of the base (5) and an element (9) for closing the stopper (3) by at least covering the spout (7) for pouring. According to the invention, the stopper (3) comprises a sealing device (21) between the closure element (9) and the spout (7) formed of cooperation elements (22a, 22b) of corresponding shapes and of different moduli of elasticity in order to guarantee an improved seal each time the cap (3) is closed.
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