>> Search results for: 639227901 NSN Search Results National Stock Number (NSN) Description 5935-01-542-1290, 5935015421290 PENETRATION SLEEVE 4820-01-541-1543 , 4820015411543 VALVE,BALL 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