The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 5950-01-582-0288
NSN 6650-01-613-2963
NSN 5965-01-399-8454
NSN 5835-01-537-1228
NSN 6220-01-593-1984
NSN 6220-01-441-6713
NSN 5930-01-519-9318
NSN 5915-01-470-2891
NSN 5920-01-346-4777
NSN 6685-00-364-0821
NSN 6220-01-128-8248
NSN 5935-01-313-8404