The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 5925-00-227-0396
NSN 6110-01-193-6613
NSN 5998-01-431-9329
NSN 5835-01-354-0566
NSN 5998-01-250-3793
NSN 5895-01-598-4065
NSN 5925-00-347-0566
NSN 5990-01-030-1034
NSN 5998-00-899-7002
NSN 5965-01-132-8736
NSN 5985-00-483-1249
NSN 5950-01-427-3723