Dispenser comprising: - a reservoir provided with a neck forming at least one thread (T) and an upper edge, - a dispensing head comprising a dispensing member, a pusher and a fastening member engaged both with the neck thread and the dispensing member, the fixing member comprising a skirt forming several bosses (62), at least some of these bosses (62) coming into pressed contact with the thread (T) of the neck, characterized in that each boss (62) comprises two triangular lateral flanks and two inclined ramps (621, 622) which meet at an apex (623) which points radially inward. "Figure for the abstract: figure 6"
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