That may be used to repair the quick disconnect from the Ground Umbilical Carrier Plate or GUCP.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, a worker (left) checks a seal that may be used to repair the 7-inch quick disconnect from the Ground Umbilical Carrier Plate, or GUCP. A leak of hydrogen at the location during tanking June 12 for the STS-127 mission caused the mission to be scrubbed at 12:26 a.m. June 13. The GUCP is the overboard vent to the pad and the flare stack where the vented hydrogen is burned off. Endeavour is scheduled to launch on its STS-127 mission on June 17 at 5:40 a.m. EDT. Photo credit: NASA/Tim Jacobs