The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 5920-01-621-7595
NSN 6145-01-514-0078
NSN 6645-00-223-8018
NSN 6610-01-253-1449
NSN 6105-00-630-4634
NSN 5996-01-351-1558
NSN 6110-00-594-7640
NSN 6110-00-948-3204
NSN 5985-01-196-4843
NSN 5905-01-339-1831
NSN 5945-00-281-1351
NSN 7035-01-423-8343