>> Search results for: 31C50S NSN Search Results National Stock Number (NSN) Description 4820-99-725-4992, 4820997254992 VALVE,CHECK 4820-99-254-4275 , 4820992544275 VALVE,CHECK 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