AN6033-1, MS21211-4, Aircraft Oxygen System Check Valve

Aircraft Oxygen System Check Valve. P/N AN6033-1 or MS21211-4. Alternate P/Ns MS21211, MS-21211-4, AN6033-1, MIL-PRF-7908, 005293198, 2289, 2289M, 4390, 43A9030, 4820005293198, 8148650, 9802. NSN: 4820-00-529-3198. It was removed from a salvage aircraft.