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 6645-01-261-4676
NSN 6145-01-619-2243
NSN 5920-01-114-6264
NSN 5950-01-406-0331
NSN 5996-00-067-3652
NSN 5920-01-313-3516
NSN 6240-00-157-8529
NSN 5910-01-487-2183
NSN 6110-00-632-0229
NSN 2925-00-017-9807
NSN 5915-01-159-7016
NSN 6220-00-195-4655