A swivelling coupling assembly for providing a swivellable interconnection between fluid-containing lines. The assembly includes a housing and a retention member for retaining the housing while cooperating with it to allow the housing to spherically swivel therein. The housing has a bore for allowing hydraulic fluid to flow between the interconnected lines. The assembly also includes at least one male component removably mountable within the bore of the housing to be swivellable therein and to prevent external leakage of the fluid. The male component is connected to one line and has a canalization allowing the fluid to flow between the pair of lines through the assembly. Multifunctional swivel functionality is achieved to reduce the torsion on interconnected lines, such as during operation with dynamic machinery.