National Stock Number
4820-00-405-5697
National Stock Number (NSN) 4820-00-405-5697, or NIIN 004055697, (valve,vacuum breaking) was assigned January 20, 1972 in the Federal Logistics Information System (FLIS). NIIN 004055697 was cancelled on October 2, 1995, with a cancelled status of "Item is Cancelled - USE." This NSN was replaced by NSN 4820013019077. This NSN does not replace any other NSNs.
There are no manufacturer part numbers associated to this NSN.
This part number has not been procured by the US Government in over 5 years.
This NSN is assigned to Item Name Code (INC) 08101. [AN ITEM DESIGNED TO AUTOMATICALLY RELIEVE VACUUM, BY THE INTAKE OF AIR, WHEN THE INTERNAL PRESSURE FALLS BELOW ATMOSPHERIC PRESSURE. SEE ALSO VALVE, VACUUM REGULATING.]. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 4820004055697 contains an unknown precious metal.
This information was last updated on Aug 01, 2025.