The experiment suite included a number of propellant valves, nozzles and seals similar to those used on a wide variety of commercial and U.S. government satellites, plus a series of four prototype tools that could be attached to the distal end of the Dextre robotic arm. Each tool was a prototype of a device that could be used by future satellite servicing missions to refuel spacecraft in orbit. RRM is the first in-space refueling demonstration using a platform of fuel valves and spacecraft plumbing representative of most existing satellites, which were not designed for refueling.[1]