Titanium fuel tank for the Reaction Control System (RCS) of the Apollo Service Module.
Helium pressurizing gas pushed against flexible bladders in the fuel and oxidizer tanks to force the weightless propellants out of the tanks. (The bladder has been removed from this tank.)
Photos show the tank with its probe assembly installed and removed, and views of each end of the probe assembly.
(NASA graphic) shows the components and complete assembly of the tank.
shows placement of RCS tanks in the Apollo Service Module (showing two of the four sets installed).
Made by Bell Aerosystems Company, “TANK (N2H4/UDMH) POSITIVE EXPULSION,” dated 6/66, North American specification ME282-0008-000X (last digit unreadable).
7 lbs. (3 kg)
Historic Space Systems at www.space1.com