FIELD: construction engineering; pipe laying. SUBSTANCE: proposed preassembled fitting has housing, nut and collet arranged inside. Nut is turned onto housing through preset distance making it possible for fitter to provide upsetting of corrugated pipeline. With nut additionally tightened up, conical surface of housing flares end of corrugated pipeline and provides metal-to-metal sealing owing to backward bending of pipe corrugations with making of double bell on its end. EFFECT: simplified mounting, improved reliability of connection. 12 cl, 14 dwg
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