| 摘要 |
The nozzle for fixing a plunger tube connects with the inside of the casing which it extends via a narrowed passage (12) whose diameter is less than the internal diameter of the nozzle and of the plunger tube and in that the tubular wall of the nozzle is internally and/or externally grooved with at least one groove (10) extending radially in a stop piece (11) limiting the pushing in of a plunger tube inside or outside the nozzle. <IMAGE>
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