>> Search results for: R2090N NSN Search Results National Stock Number (NSN) Description 4240-01-250-2261, 4240012502261 RESPIRATOR,AIR FILTERING 4240-01-250-8981 , 4240012508981 FLAP,EXHALATION VALVE 4240-01-250-8982, 4240012508982 COVER,EXHALATION VALVE 4240-01-250-9056 , 4240012509056 HEADBAND,RESPIRATOR 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