>> Search results for: NAS521421 NSN Search Results National Stock Number (NSN) Description 4720-00-177-5812, 4720001775812 Cancelled -> Replaced by 4720004713160 4720-00-021-3526 , 4720000213526 HOSE,AIR DUCT 1 Related Inventory Search You can use this search box to continue searching. Search parameters can include any combination of characteristics, specifications, description, partial part numbers, NSN or other stocking number. Special characters are not needed and are automatically stripped before searching. Do you sell this part? Become part of our growing pool of certified suppliers. Send Information