The sealing member or stopper, which may or may not be spherical, used in a drain, automatic, boat.
NSN 5960-01-552-0862
NSN 5910-00-137-5914
NSN 6620-00-133-0220
NSN 5990-00-226-7894
NSN 4140-00-880-7804
NSN 5920-00-322-8618
NSN 6320-01-600-5808
NSN 5910-01-229-1712
NSN 6240-00-177-0385
NSN 6220-01-370-4215
NSN 6105-00-959-5434
NSN 6105-01-116-3439