A wiper device of a blown container, including a hollow body having a first and a second end defining respectively a first and a second opening, a flange extending from an outer surface of the hollow body at the first end, and a wiper element extending from an inner surface of the hollow body, the wiper element defining a passage with a smaller section than the first and second openings. The hollow body features at least two localized swellings for fastening the wiper device onto the container. The localized swellings extending as protrusions from the outer surface of the wiper, near the second end of the hollow body.