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Commander George Zamka, and Mission Specialists Nick Patrick and Bob Behnken practice installing ammonia hoses on a test stand in the high-bay clean room at NASAs Marshall Space Flight Center, Huntsville, Ala. Accompanied by Eric Howell, Boeing Huntsville chief engineer for the International Space Station, the astronauts got a feel for the flexibility of the pressurized 500 psi hoses that will be installed during the STS-130 space shuttle mission. The hoses will be used to connect the new Tranquility modules active cooling system to plumbing on the outside of the space station. Shuttle Endeavour is scheduled to launch to the station Feb. 7