| 摘要 |
In a coupling unit having first and second parts connectable and disconnectable with each other, the second part is provided with an outer ring-shaped groove which extends through the wall of the second part along the circumference. The first part has a corresponding recess or groove. The parts are connected by at least one locking ring. The locking ring is located in the groove of the second part and has at least one indentation which extends through the groove and interacts with the recess in the first part.
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