FIELD: oil and gas production industry. SUBSTANCE: device is used in construction of wells. Device has body with coupling thread, sealing collar, rod, seat, ball, supporting nut, and sealing rings. Made inside body below coupling thread is step. Suspended from this step is rod with nut screwed on it. Nut has holes and bevelled upper surface. Supporting nut is screwed on lower part of rod. Mounted on supporting nut is cylindrically shaped sealing collar. Collar is rubberized together with movable metal washer. Resting on washer is pipe with sectionalized piston which is assembled of alternating flexible and metal rings compressed together by nut. Supporting nut at its one side and over its external surface has shoulder with bevelled internal surface. EFFECT: higher reliability and simpler design. 1 dwg
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