Apollo Command Module Environmental Control Unit (ECU) Suit Compressor Pump, measuring 8" long and 6.75" in diameter, with an Airesearch label on the side: "Compressor Centrifugal Motor Driven…Part 826000-2-1, Serial 15-121." A red label denotes the unit as "Eng'r Evaluation or R&DS Use, Not for Production." This centrifugal pump was associated with the Apollo Command Module system that provided breathable atmosphere to the astronauts when suited in their A7L spacesuits.
