Abstract: The present invention relates to the interconnection of conduits and pipelines carrying liquids or gasses. The invention provides a low-cost multi-angle adjustable joint and a coupling suitable for round-section piping, tubing, air ducts or drainage. Each extremity of the coupling is arranged for connection to an adjacent pipe, filter, pump or other fluid flow item. The invention provides a multi-angle adjustable joint for two section pipes, tubes or ducts, comprising; a first round pipe provided with a first round inner flange disposed at an angle relative to the pipe axis: A second round pipe provided with a second round inner flange disposed at an angle relative to the second pipe axis, the second inner flange being sized to match the first inner flange, and when the two flanges are oriented face-to-face the pipes can be steplessly rotated relative to each other to a position wherein the largest total angle between the axes of the two pipes is at least 30° and is the sum of the two angles.