A female element quick coupling for releasably joining two pipes conveying a fluid under pressure and which receives a male coupling wherein the female element includes a latch movable relative to a body of the female element between a first position, in which it retains the male portion in a leaktight coupling position, and a second position, in which it retains the male portion in a position for purging a downstream pipe. The female element further includes a control member mounted to slide in an open bore in the body for causing the latch to move at least towards the second position. This female element includes a gasket for closing a gap defined between an outer face of the member and an inside face of the bore especially at high purging pressures.