>> Search results for: YA127C9 NSN Search Results National Stock Number (NSN) Description 4240-01-612-3344, 4240016123344 FILTER,RESPIRATOR,AIR FILTERING 4240-01-677-1689 , 4240016771689 FILTER,RESPIRATOR,AIR FILTERING 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