| CPC F16L 15/006 (2013.01) | 13 Claims |

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1. A connecting element comprising: comprising
a main body including at least one housing, delimited by a top edge and by a bottom edge, comprising at least one main protrusion made along a direction connecting the top edge and the bottom edge of the at least one housing,
at least one annular insert housed in the at least one housing, said at least one annular insert comprising an outer constraint device and at least one window, made on a sidewall thereof,
wherein the at least one housing comprises at least one interrupted additional protrusion complementary to the at least one window, only connected to the top edge or to the bottom edge of the at least one housing.
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