A bung is both the opening and the plug that closes it. Sizes and thread forms vary by drum standard, and the gasket material has to suit the product inside. Drums for regulated goods use closures tested as part of the whole package, not chosen separately.
Where you meet this term
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What packaging is used for viscous products?
Pastes, purees and heavy liquids are decided by how you get them out, not how you get them in.
TermTight-head drum
A drum with a fixed top and threaded bungs.
TermUN-rated
Packaging tested and marked to a United Nations standard for dangerous goods.
TermGasket
The sealing element between a lid or plug and the container.
If this becomes a real requirement
CAQUIN sources industrial packaging to specification. Send what you use today, roughly how much, and where it ships — a photo is enough to start.