The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 5996-01-364-5393
NSN 5925-01-337-2362
NSN 6135-00-112-8637
NSN 6645-01-308-5729
NSN 5990-01-317-5743
NSN 5920-00-258-6822
NSN 6105-01-468-0024
NSN 6620-01-542-8709
NSN 6150-01-160-3716
NSN 5935-00-282-2729
NSN 6645-00-825-5677
NSN 5835-01-580-0446