The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 6650-01-319-6930
NSN 5985-00-480-5692
NSN 6110-00-617-9512
NSN 6610-01-298-2649
NSN 6645-00-004-8628
NSN 6110-01-193-4832
NSN 5960-00-665-3154
NSN 6650-01-564-0665
NSN 6220-00-103-3419
NSN 6150-01-442-7622
NSN 6105-01-502-9273
NSN 5905-01-348-4212