The invention relates to a plug-in safety coupling for pressure pipes (10; 13), which comprises a coupler box (1) with a blocking member (4) that can be pivoted therein. Said blocking member is provided with a diametrical continuous bore (5) in which a plug (11) can be inserted, in a depressurized state, at an acute to right angle to the orientation of the pipe. The blocking element (4) can be brought into the orientation of the pipe by pivoting the plug (11). A cupped blocking sleeve (2) having a hemispherical front end (7) is put on the coupler box (1) with the pivoting element (4). Said hemispherical front end (7) comprises a spherically extending elongated hole (8) that extends from the center of the hemispherical end (7) along a great circle on the hemispherical end (7). The blocking sleeve (2) is rotatably mounted on the coupler box (1) and is impinged by a spring to such an extent that its elongated hole (8) extends offset by 90° relative to the pivoting plane of the blocking element (4) of the plug (11). Only when the blocking sleeve (2) is pivoted, a plug (11) can be inserted. Once the plug is pivoted into the orientation of the pipe, the blocking sleeve (2), by the force of the spring, is pivoted by 90° and secures the plug (11) from pivoting back.
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