Fixing ring (4) for fixing a dispensing member (2) such as a pump or a valve, to a neck (11) of a tank (1), the ring (4) comprising receiving means (41) capable of receiving the dispensing member (2) and a substantially cylindrical anchoring skirt (42) intended to fit around the neck (11) of the tank (1), the skirt (42) defining an inner wall (42i) defining a first section of upper inner wall (43) intended to engage with the neck (11) and a second section of lower inner wall (44) intended to extend out of contact with the neck (11), characterized in that the anchoring skirt (42) comprises an orientation tab (45) which interrupts the second section of lower inner wall (44) and juts out radially towards the inside with respect to this second section (44).