ESP-2 was installed with the assistance of Space Shuttle Discovery's robotic arm and two spacewalkers during the STS-114 mission.[4] It is much larger than ESP-1 with eight FRAMs creating room for up to eight spare parts (ORUs). Like ESP-1, it is powered by the Unity Module. However unlike ESP-1, the ESP-2 is attached to the Quest Joint Airlock using a specialized ESP Attachment Device (ESPAD).
Author/Origin: NASA Johnson Space Center http://www.nasa.gov/centers/johnson/home/
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