FIELD: gas and oil producing industry. SUBSTANCE: appliance for replacement of gate valves of wellhead equipment without well killing has removable plug and unit for its installation. Removable plug has cylindrical body with circular bead and recesses on one end, and, on the other end, successively installed bushing with inclined recesses of dovetail type and slips embraced by spring ring, collet with flexible seal which is pressed to collet by sleeve with cam bushing coaxially screwed in it and installed on cylindrical body supported in bearings so that its cams protrude beyond sleeve. EFFECT: higher efficiency. 3 cl, 4 dwg
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