A closure for closing the aperture of a pressure driven dispensing container, said closure comprising: (a) an outer shell comprising: • a substantially planar base comprising a first outer main surface and a second inner main surface separated from the outer surface by the thickness of the base, said base further comprising a first dispensing aperture fluidly connecting the outer surface to the inner surface and suitable for receiving a dispensing tube; • an outer peripheral skirt jutting out of the periphery of the inner surface and suitable for sealingly fixing the closure to the aperture of said pressure driven dispensing container; and (b) a flexible valve in contact with the inner surface, located within the outer peripheral skirt, and defining an interior passageway having a first opening at one end adjacent to and in fluid communication with the first dispensing aperture and having a second opening at the other end of the passageway, wherein the flexible valve is resiliently biased such as to naturally shut and seal the second opening, and such that said sealed second opening is reversibly openable by pressing the tip of a hollow dispensing tube through the first aperture down said interior passageway, and out of said second opening, wherein the resilient bias of the flexible valve is obtained by means of external resilient means arranged such as to apply a compressive force to press shut and seal the second opening, characterized in that, the external resilient means are selected among foams made of a resilient cellular material. (a) an outer shell comprising: • a substantially planar base comprising a first outer main surface and a second inner main surface separated from the outer surface by the thickness of the base, said base further comprising a first dispensing aperture fluidly connecting the outer surface to the inner surface and suitable for receiving a dispensing tube; • an outer peripheral skirt jutting out of the periphery of the inner surface and suitable for sealingly fixing the closure to the aperture of said pressure driven dispensing container; and • a substantially planar base comprising a first outer main surface and a second inner main surface separated from the outer surface by the thickness of the base, said base further comprising a first dispensing aperture fluidly connecting the outer surface to the inner surface and suitable for receiving a dispensing tube; • an outer peripheral skirt jutting out of the periphery of the inner surface and suitable for sealingly fixing the closure to the aperture of said pressure driven dispensing container; and (b) a flexible valve in contact with the inner surface, located within the outer peripheral skirt, and defining an interior passageway having a first opening at one end adjacent to and in fluid communication with the first dispensing aperture and having a second opening at the other end of the passageway, wherein the flexible valve is resiliently biased such as to naturally shut and seal the second opening, and such that said sealed second opening is reversibly openable by pressing the tip of a hollow dispensing tube through the first aperture down said interior passageway, and out of said second opening, wherein the resilient bias of the flexible valve is obtained by means of external resilient means arranged such as to apply a compressive force to press shut and seal the second opening, characterized in that, the external resilient means are selected among foams made of a resilient cellular material.