National Stock Number
4240-00-368-6143
National Stock Number (NSN) 4240-00-368-6143, or NIIN 003686143, (valve,antiback draft,protective shelter) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). NIIN 003686143 was cancelled on April 29, 2010, 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) 15648. [AN ITEM CONSISTING OF A METAL FRAME, TO WHICH IS ATTACHED A HINGED METAL FLAPPER PLATE. THE FLUCTUATING FLAPPER PLATE AUTOMATICALLY REGULATES THE PRESSURE BETWEEN THE OUTER AIR LOCKS AND THE ATMOSPHERE OF PROTECTIVE SHELTERS. EXCLUDES:DRAFT CONTROL, FLUE, AUTOMATIC.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no information in the HMIRS; however, the NSN is in an FSC in Table II of Federal Standard 313 and an MSDS may be required by the user. The requirement for an MSDS is dependent on a hazard determination of the supplier or the intended end use of the product. NSN 4240003686143 does not contain precious metals.
This information was last updated on Jul 01, 2025.