Power Coupling
From OCE Space Simulation
Purpose
The power coupling is a piece of yellow foam attached to the exterior of the Habitat. It represents a power coupling for the hab's electronics systems. When the Habitat suffered an electronics failure, a simulator would remove the power coupling from it's bracket. When replaced, the power would be restored to the habitat. This gave the astronauts something that they had to physicaly fix in the event of a disaster.
Replacement
The addition of a completely new engine room, as well as the construction of a new engine mount for the habitat was proposed in 2005-2006. Both proposals would replace the power coupling with something more intrecate and realistic. However, bot hproposals never got beyond the planning/scrounging stage.