FIELD: mining.;SUBSTANCE: invention relates to the mining industry and is intended for use in oil and gas production. Device includes the outer and inner halves, interconnected by twisting through the presence of threaded elements. Contact point at the end of the inter-nipple insert and the rounded end of the nipple of the tubing at the ends of the insert is made with sealing nodes in the form of grooves-recesses with a radius less than the radius of the end curvature on the nipple of the tubing. Threaded connection on the inner surface of the outer half of the insert is made in the form of three threaded sections having the same dimensions and spaced from each other at an equal distance.;EFFECT: excludes the possibility of eddies (turbulence) formation of the produced fluid flow, while the corrosion-erosive rinse – wear of the metal of the inner surface of the tubing decreases.;1 cl, 3 dwg
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