The filter (5) comprises at least one orifice (17) cooperating with resilient closure means (18) which, when a certain pressure of the liquid is reached in the container, disengaged from said orifice (17) on a passage (19) is narrow enough to ensure the filtration of the liquid which has been in contact with said product. & br / the elastic blocking means (18) are constituted by at least one elastic tongue (18) secured to the filter (5) and closing substantially said orifice (17). br / use in particular for the preparation of the "espresso" coffee.
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