The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 5996-01-279-5808
NSN 5965-00-335-0305
NSN 6620-00-185-1671
NSN 5960-00-161-3728
NSN 6145-01-465-4770
NSN 5920-01-093-1081
NSN 6650-01-062-0828
NSN 6130-00-966-1776
NSN 5895-01-510-6325
NSN 6105-01-124-0773
NSN 6105-01-109-3936
NSN 6620-01-562-0615