Stainless Steel, Aluminum
An Apollo Command Module Oxygen (O2) Redundant Main Regulator; date of production assessed as 1973 which likely affiliates this component as a flight ready spare for the Apollo-Skylab Command Modules - Spacecraft’s CSM 111 (Apollo-Soyuz Transfer Program) . The main regulator reduces the O2 supply pressure to 100 + 10 psig for use by subsystem components. The regulator assembly is a dual unit which is normally operated in parallel. Selector valves at the inlet to the assembly provide a means of isolating either of the units in case of failure, or for shutting them both off. Integral relief valves limit the downstream pressure to 140 psig maximum.