Movement-constraining assembly for fluid-conveying system

A movement-constraining assembly for a fluid-conveying system, comprising:

• a tubular body adapted to be secured to a component coupling end of a component of the fluid-conveying system;
• a fluid-conveying tube having a tube coupling end adapted to be connected to the component of the fluid-conveying system and defining an inner passage for fluid to pass therethrough to or from the component, the tube having an interface at the tube coupling end;
• and
• a blocking nut having an annular body, an inner surface defining at least one first projection protruding radially inwardly from the annular body, the inner surface complementary to at least a surface of the interface of the tube to block rotation between the tube and the blocking nut, the blocking nut further comprising an outer surface defining at least one second projection protruding radially outwardly from the annular body, the outer surface complementary to a surface of the tubular body to block rotation between the blocking nut and the component, the annular body located radially between the fluid-conveying tube and the tubular body relative to a longitudinal axis of the fluid-conveying tube, whereby the blocking nut blocks a rotation between the fluid-conveying tube and the component coupling end.