>> Search results for: 5399021R NSN Search Results National Stock Number (NSN) Description 4820-01-506-5185, 4820015065185 VALVE,CHECK 4820-01-525-2818 , 4820015252818 VALVE,CHECK 4820-01-537-0543, 4820015370543 DISK,VALVE 4820-01-539-6056 , 4820015396056 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