Spacewalker Robert L. Satcher, Jr. fastens connections on the newly installed oxygen filled High Pressure Gas Tank (HPGT) in this image from NASA TV November 23, 2009. The HPGT was installed on a spot on the outside of the Quest Airlock. REUTERS/NASA TV (UNITED STATES SCI TECH) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS