Lunar module

The thing in the back we call the "lunar module".
It's purpose is the supply of sealing oil to the shaftseals of the generator.
The generator is cooled with hydrogen which is explosive.
So our aim is to separate the environmental air and hydrogen.
The oil is used in special seals (kind of labyrinths).
The thing is very compact; with regulators, pipes, pumps, filters, coolers; all at about 4 square meters.
The valves in front are used in the censate system and part of them are electrically driven.