Found on older starships across the galaxies, the Environmental Control Unit 250b is known for its musty smell and ability to run forever - no matter how hard you try to shut it off...
This model is designed to interface with our revamped Econoliner: Corridor walls via the lock-ridges on the back to serve as a stabilizing footer for holding the wall up. It can also be used inverted as a ceiling prop.
The locking ridges can also be trimmed off like any other piece of plastic detailing, since they are only 1mmx2mm strips. This allows you to use the ECU-250b as a stand-alone piece in dioramas without having to have an Econoliner wall panel.