A one-piece rosette (15) comprising a ring-shaped main body adapted to be detachably mounted around a tubular structure which projects from a base structure, the ring-shaped main body has - a circumferential wall (14) with a radial width between a central opening and an outer wall perimeter, - a first free wall end part (8) and a second free wall end part (9) opposite the first free wall end part, - which first free wall end part and second free wall end part (8, 9) being arranged in overlapping relationship, - the opposite first free wall end part (8) and second free wall end part (9) being flexible to and from each other in relation to the central axis of the one-piece rosette (15), wherein the overlap between the first free wall end part (8) and the second free wall end part (9) is self- locking by being arranged in tension against each other.
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