The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 5915-01-614-0686
NSN 5930-01-354-7030
NSN 6220-01-292-0980
NSN 5910-01-237-2621
NSN 5930-01-418-2433
NSN 6110-01-317-7867
NSN 6130-01-237-5992
NSN 2925-00-246-3077
NSN 6130-01-640-6467
NSN 5905-00-177-6316
NSN 5920-01-268-3791
NSN 5985-01-006-3150