As you can see, the tube isn't a tight fit. Towards the end of the video, you can see the gaps at the connector. Manufacturing defect?There is no O ring. The sizes of the pipe and the hole are designed perfectly matched, the pipe is not supposed to turn when the knob is rotated. Can you plz check if the two parts in the pics attached are fastened. And then insert pipe into the outlet hole. The pipe should not turn unless you use a lot of strength.