The present invention relates to a fitment for establishing a leak-tight fluid communication between a support having means for generating compressed gas, and at least one container containing an edible product that is to be connected to said support, characterized in that said fitment comprises: (i) at least one cylindrical, conical or frusto-conical orifice located on the container or on the support, said orifice having an ovoid cross-section and comprising at least one groove or protrusion disposed parallel the longitudinal axis of said orifice, (ii) a one-way valve to allow compressed air only in the way from said support to the container, (iii) at least one corresponding plug located on the support, or respectively on the container, for removably fitting said orifice in a leak-tight manner.
