| 摘要 |
The invention relates to a plug-in coupling for externally threaded connections, having a piston which can move by pressure medium in a cylindrical housing and is provided, on the connection side, with radially expandable clamping jaws which are held in positively locking engagement in the clamping position, sealing taking place at an end surface of the externally threaded connection or at an inner edge thereof, characterised in that there is provided a sealing piece which can move to a restricted extent with respect to the piston and, in the clamped-in position is pressed firmly against the threaded connection.
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