FIELD: equipment for canalization system. SUBSTANCE: enclosure has hermetically sealed rubber chamber provided with nipple and made from layers of rubberized cord threads. Rubber covering layer is positioned on load-bearing carcass. Enclosure is further provided with metal ring positioned on carcass on inner cylindrical part of enclosure in axial alignment with it. Metal ring may be connected with side wall of enclosure and may be provided with nipple receiving channel, blind threaded openings and rods, which may be secured to metal ring. Enclosure may have annular slot enhancing reliable fastening of it on fittings or annular slot enhancing reliable fastening of it on fittings or annular protrusion for receiving metal ring. Enclosure may have two parallel metal rings. It allows flow of liquid to be cut off in pipeline in forward and backward directions. EFFECT: increased efficiency and enhanced reliability in operation. 13 cl, 12 dwg
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