There is a bar used for tightening attached to the top
A threaded closure for openings in the body and/or end(s) of a metal shipping barrel or drum.
Classification: Other fittings nesoi of iron or nonalloy steel
NSN 5910-01-227-1939
NSN 5945-01-384-2241
NSN 5960-01-089-8155
NSN 6220-01-266-8990
NSN 6105-00-222-9300
NSN 5960-01-252-8821
NSN 5920-00-732-6763
NSN 6240-01-223-4917
NSN 5960-01-451-6993
NSN 5935-01-141-6820
NSN 5895-00-596-1729
NSN 5895-01-274-1062