National Stock Number
4520-01-365-4638
National Stock Number (NSN) 4520-01-365-4638, or NIIN 013654638, (pumping unit,vacuum,heating) was assigned October 7, 1992 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.
There is only one manufacturer part number associated with this NSN. None of the associated part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by one supplier. Today, one supplier is listed as an Active supplier for this NSN. Of the active suppliers, only one supplier is deemed design controlled or valid supply parts.
This part number has not been procured by the US Government in over 5 years.
Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Feb 13, 2014, this NSN's acquisition method was noted as: Acquire directly from the actual manufacturer, whether or not the prime contractor is the actual manufacturer. The data needed to produce this item from additional sources is not physically available. Valid AMCs: 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 05028. [AN ASSEMBLED UNIT, CONSISTING OF A RECEIVER TANK AND ONE OR MORE CENTRIFUGAL OR EQUAL PUMPS, WHICH ARE AUTOMATICALLY CONTROLLED BY MECHANICAL AND SERIES OF ELECTRICAL DEVICES OR MANUALLY CONTROLLED. THE FUNCTION OF THIS UNIT IS THE COLLECTION OF CONDENSATE AND AIR FROM A VACUUM HEATING SYSTEM AND SEPARATING THE AIR FROM THE WATER. IT RETURNS THE WATER TO THE BOILER DIRECTLY OR INDIRECTLY AND EXHAUSTS THE AIR, CREATING A VACUUM IN THE HEATING SYSTEM.]. 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 4520013654638 does not contain precious metals.
This NSN is associated to Schedule B 8414909000: parts of air or vacuum pumps, nesoi. The Schedule B End Use is listed as industrial engines. NAICS classification category 333912: air and gas compressor manufacturing.
This information was last updated on Jul 01, 2025.