Coupling arrangement in a medicament delivery device, said coupling arrangement being adapted to permanently attach a first and a second longitudinally elongated tubular component to each other wherein the coupling arrangement comprises first positive connection means configured to lock the first and the second components to each other such that the components are locked from being moved in a longitudinal direction in relation to each other, and a second positive connection means configured to lock the first and the second component to each other such that the components are locked from being rotated in relation to each other about a longitudinal axis of the components.一種藥劑輸送裝置中之耦合機構,該耦合機構被設計成適於使第一及第二縱向修長管狀組件永久地彼此附接,其中該耦合機構包括第一正連接機制,其被建構來使該第一及該第二組件彼此鎖定,使得該等組件被鎖定而無法在一縱向中相對於彼此而移動;及第二正連接機制,其被建構來使該第一及該第二組件彼此鎖定,使得該等組件被鎖定而無法相對於彼此繞著該等組件之縱向軸線旋轉。10‧‧‧組件12‧‧‧組件14‧‧‧縱向軸線16‧‧‧近側端部區段18‧‧‧第一環狀表面20‧‧‧突出部份26‧‧‧第一鎖定機制32‧‧‧第二止動構件34‧‧‧切口
