National Stock Number (NSN) 4330-01-431-6621, or NIIN 014316621, (pneumatic muffler,exhaust-intake) was assigned May 16, 1996 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.
There are 2 manufacturer part numbers associated with this NSN. None of the associated part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 2 suppliers. Today, 2 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, 2 suppliers are deemed design controlled or valid supply parts.
This part number has not been procured by the US Government in over 5 years, with the most recent procurement date of Aug 12, 2014. There has been one contract issued for this part number, with one award given. The US Government has only awarded those contracts to one supplier. The last contract numbers awarded were: SPE7M114VF680. The total value of the awarded contracts has been US$ 336.90.
This NSN is somewhat common among different platforms, belonging to 3 different weapons systems.
There has been very little demand for this national stock number. The demand for this NSN originated from less than 5 countries. The 24 month forecast from the US Government for this part number has high volatility, with an estimated forecasted value of US$ 701. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Apr 02, 2005, this NSN's acquisition method was noted as: Suitable for Competitive Acquisition. (Potential sources shall include dealers/distributors.) The Government physically does not have in its possession sufficient, accurate, or legible data to purchase this part from other than current source(s). (NOTE: This code is applicable only to parts under immediate buy requirements and only as long as the deficiency is under review for resolution and appropriate recoding.) Valid AMCs: 1, 2, 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 37112. [A NOISE CONTROL/FILTERING DEVICE OF VARIOUS SIZES, SHAPES, DESIGNS, MATERIALS (METALLIC/NON-METALLIC) AND VARIED MOUNTING CONFIGURATIONS USED TO DIFFUSE AIR BLASTS, LOWERS AIR VELOCITY, REDUCE NOISE, FILTRATION OF AIRBORNE MOISTURE AND/OR DUST CONTAMINATION, PRESSURE EQUALIZATION, SPEED CONTROL FOR AIR OPERATED DEVICES. FOR VEHICULAR APPLICATION SEE MUFFLER, (AS MODIFIED).]. 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 4330014316621 does not contain precious metals.
This NSN is associated to Schedule B 8487900080: machinery parts not containing electrical features, and not specified or included elsewhere in chapter 84, except ships' propellers. The Schedule B End Use is listed as industrial machines, other. NAICS classification category 333999: all other miscellaneous general purpose machinery manufacturing.
This information was last updated on Jul 01, 2025.