FIELD: pressure-tight pipe joints. SUBSTANCE: nipple and connecting unit provided with entering threaded part, hexahedron, and connecting threaded part are interconnected. The connecting part is constructed as the inner bushing having the outer collar and longitudinal grooves and three outer bushings whereon hexahedron, entering and connecting parts are mounted and inner ring projections, which are fitted in the longitudinal grooves of the inner bushing with interference, are provided. A bore is made in the outer bushing with the connecting part. The collar of the internal bushing abuts against the bore. The length of the longitudinal groove is less than the total length of the entering and connecting parts and hexahedron. The nipple is connected with the inner bushing. EFFECT: improved design. 2 cl, 10 dwg
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