National Stock Number
4520-00-222-3559
National Stock Number (NSN) 4520-00-222-3559, or NIIN 002223559, (valve,air venting,steam) was assigned January 1, 1961 in the Federal Logistics Information System (FLIS). NIIN 002223559 was cancelled on May 8, 2012, with a cancelled status of "Item is Cancelled - Inactive." There is no known replacement specified for this stock number. 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) 04906. [AN AUTOMATIC VALVE DESIGNED TO RELIEVE, AUTOMATICALLY, ACCUMULATED AIR IN VARIOUS TYPES OF STEAM HEATING SYSTEMS.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 4520002223559 does not contain precious metals.
This information was last updated on Jul 01, 2025.