I was always worried about my Subal type 3 ports coming off underwater, so I switched to Nauticam. Now, I find that taking ports off of my Nauticam 7D housing is difficult, and requires a lot of force. Much harder yet is separating the zen minidome from the extension ring. I have had to soak them in very hot water, and then use all my strength to rotate them and pull them apart. (Yes, I did unlock them). Now, I cannot get them apart at all. I would have much preferred the easy removal with Subal to my present situation.
All comments appreciated.