FIELD: sealings of intertube spaces, mainly in crossing zones of main pipelines with motor vehicle and railway roads laid in protective envelope. SUBSTANCE: collar of flexible elastoviscous material, mainly of rubber includes two different-diameter cylindrical portions and transition part joining them. Collar has lengthwise stepped connector having male and female members with preferable relation of their thickness values 1 : 1. EFFECT: enhanced reliability of joint. 3 cl, 7 dwg
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