Fuel boost pump unit for the Aerojet Rocketdyne RL10 liquid-fuel cryogenic rocket engine integrated into the Centaur upper stage of the Atlas-Centaur launch vehicle. The pump measures approximately 17″ x 15″ x 14″, and has two Pesco Products/Borg-Warner plates on the top, identifying it as: "Fuel Boost Pump, GD/Astronautics Spec No. 55-02142-5, GD/Astronautics Spec Cont Dwg No. 58-02143-5, Mfg's Part No. XL044094-010, Mfg's Serial No. X-1200, Contract No. NAS 3-3232." Centaur was the first rocket stage to use liquid hydrogen (LH2) and liquid oxygen (LOX) propellants, a high-energy combination that is ideal for upper stages.
