FIELD: construction.
SUBSTANCE: in connection assembly on locking elements, connection element and nipple element there are ledges passing in circumferential direction that are substantially triangular or serrated in their cross section, and such ledges stretch along the part of the entire circumference of locking elements, the connection element and the nipple element. In process of insertion the ledges are elastically deformed and engaged to each other, and at least one section of circumference of locking elements, the connection element and the nipple element is free of triangular or serrated ledges and have guides for insertion process protected against barring.
EFFECT: invention increases reliability of connection sealing with protection against barring during assembly.
7 cl, 3 dwg
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