National Stock Number
4820-01-256-2921
National Stock Number (NSN) 4820-01-256-2921, or NIIN 012562921, (valve,check) was assigned June 3, 1987 in the Federal Logistics Information System (FLIS). NIIN 012562921 was cancelled on April 2, 1996, with a cancelled status of "Item is Cancelled as Duplicate." This NSN was replaced by NSN 4820010488473. This NSN does not replace any other NSNs.
There are no manufacturer part numbers associated to this NSN. ISO Group has several sources of supply for 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) 05487. [A VALVE PERMITTING FLOW IN ONE DIRECTION ONLY. IT DOES NOT HAVE A STEM, EXCEPT WHEN EQUIPPED WITH A LEVER AND WEIGHT AND HAS NO PRESSURE ADJUSTMENT. IT MAY BE INLINE OR CARTRIDGE (MANIFOLD) DESIGN.]. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 4820012562921 contains an unknown precious metal.
This information was last updated on Jun 01, 2025.