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 6610-00-681-0590
NSN 4140-00-036-2851
NSN 5935-01-144-8242
NSN 6130-00-008-5144
NSN 5920-00-646-5430
NSN 6620-01-412-0938
NSN 6645-01-191-9515
NSN 5915-01-009-1327
NSN 6105-00-807-7619
NSN 5935-00-944-7179
NSN 5915-01-554-4192
NSN 5998-01-588-5562