Here it is. First shot is showing how the setup looks from inside the tank. I used different connectors because I don't have spare ones from the real setup. Second image is Fluval prefilter sponge with airstone inside and tubing. You can attach it to the wall of the box with silicone suction cup. It is optional but is good place for bacteria to grow.
Third image shows some modification to prevent shrimps to jump in main tank. Belive me they do .Blue air tubing cut from the bottom and inserted to Marina box wall. Fine SS mesh to keep shrimps inside.
Let me know if there is something not clear. The thread of the real connector going to the pump with little pressure. It is perfect fit without any modifications.