Aquatica housing have NON threaded 16 mm hole through, and thickness of the wall about 5 mm, Nauticam have threaded port M16x1. I think you do not have enough threads on Nauticam bulkhead connector to put security nut (to hold the bulkhead connector for Aquatica). You need length of the thread for the bulkhead, at least 12 mm.
Hi, What external monitor do you use? I never saw this kind of bulkhead. Must say I like this connection more than ma Wahoo HD monitor bulkhead.
I personally use Wahoo housing with Sony CLMV55 and I am very satisfied user. I cant imagine shooting video without it... I had only option to buy this one because it has depth rating 130m. There is few good monitors out there and Nauticam makes good housings but depth rating is 60m