FIELD: oil-and-gas producing industry. SUBSTANCE: stepped bushing is installed with the aid of shearing screws on the body and smaller step of branch pipe. The internal cavity of said bushing communicates with under-piston space through radial channel in the branch pipe. Smaller step of said branch pipe is secured in the body by means of cams positioned in radial channels of the body and in the circular groove on the external surface of branch pipe smaller step. EFFECT: higher reliability of installing bridge plug in well. 4 dwg
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