The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 5835-01-461-8184
NSN 5910-01-160-3680
NSN 6650-00-382-6080
NSN 5999-01-139-2482
NSN 4140-01-423-1005
NSN 5990-01-227-6526
NSN 6110-01-389-4005
NSN 6220-00-938-8907
NSN 5930-01-499-0004
NSN 5960-01-316-6563
NSN 6135-01-434-6308
NSN 6220-01-330-5888