From the left to the right of the picture, you can see one oval bore, where the outlet of one nozzle will be. Then there is one of the four bulkhead brackets. In the middle is the cap of the former late access hatch. Above it, there is the D-Sub bracket.
The four bulkhead brackets will be used to mount the bulkhead. The D-Sub bracket ist fixated above the former late access hatch. At the bottom of the picture you can see the late access hatch, which will be used to refill the pressure tank.
This late access hatch was used from the former experiment.
The late access hatch will be used to refill the pressure tank. The screws on the left side of the picture shut bores, which were used from the former experiment. The screws on the right side of the picture fixate one bulkhead bracket and the D-Sub bracket.
Former Late Access Hatch
Cleaning the Module Ring
Bulkhead Brackets
D-Sub Bracket
Late Access Hatch