Workers prepare to install a new quick disconnect on the plate GUCP of space shuttle Discovery's external fuel tank.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to install a new 7-inch quick disconnect on the ground umbilical carrier plate (GUCP) of space shuttle Discovery's external fuel tank. A hydrogen gas leak at that location during tanking for Discovery's STS-133 mission to the International Space Station caused the launch attempt to be scrubbed Nov. 5. The GUCP is the overboard vent to the pad and the flame stack where the excess hydrogen is burned off.

For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Charisse Nahser