>> Search results for: AC990B NSN Search Results National Stock Number (NSN) Description 4310-01-671-7361, 4310016717361 PNEUMATIC MUFFLER,EXHAUST-INTAKE 4310-01-216-4155 , 4310012164155 BREATHER 2990-01-442-1795, 2990014421795 MUFFLER,EXHAUST 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