>> Search results for: 21289A NSN Search Results National Stock Number (NSN) Description 4820-00-058-7317, 4820000587317 SEAT,VALVE 5910-00-728-4321 , 5910007284321 Cancelled -> Replaced by 5910004752718 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