FIELD: pipe line engineering. SUBSTANCE: device received in pipe line 1 has rod 3 rigidly connected with cylinder 2 whereon movable hollow cylinder 4 is mounted with a spaced relation. The end face of the cylinder is provided with ring conical projection 5 and faces the space between the cylinders. Rod 3 faces the space of a pipe line to be sealed. EFFECT: enhanced reliability. 1 dwg
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