FIELD: sealing technology for machines and apparatus. SUBSTANCE: fitted coaxially in threaded pipe union is nipple with end circular projection. One end of floating stepped bush is inserted in hole of the nipple for axial displacement and its other end is provided with end circular projection received by circular shoulder of the hole being sealed and engageable with gasket. Outer diameter of bush surface is lesser than outer diameter of sealing gasket. EFFECT: enhanced reliability. 3 dwg
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