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 5835-01-028-0097
NSN 5985-01-169-9368
NSN 6105-00-432-2654
NSN 6220-01-214-4406
NSN 5910-01-472-2232
NSN 5920-01-391-7624
NSN 5990-01-633-9503
NSN 5999-00-149-0624
NSN 5950-00-707-6107
NSN 6645-01-258-5558
NSN 6650-01-170-5440
NSN 6620-01-368-1531