National Stock Number
4820-01-199-5455
National Stock Number (NSN) 4820-01-199-5455, or NIIN 011995455, (valve,restrictor check) was assigned January 23, 1985 in the Federal Logistics Information System (FLIS). NIIN 011995455 was cancelled on September 2, 1995, with a cancelled status of "Item is Cancelled - USE." This NSN was replaced by NSN 4820013967749. 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) 20520. [A VALVE HAVING AN ORIFICE IN THE POPPET, DISK, OR THE LIKE, TO PERMIT RESTRICTED FLUID FLOW WHEN THE VALVE IS SEATED. IT DOES NOT HAVE A STEM OR PROVISIONS FOR PRESSURE ADJUSTMENTS, AND IS SIMILAR TO A VALVE, CHECK WITH THE EXCEPTION OF THE ORIFICE WHICH PERMITS FLUID FLOW IN MORE THAN ONE DIRECTION.]. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 4820011995455 does not contain precious metals.
This information was last updated on Aug 01, 2025.