Exact(3)
In both the Armstrong and Krupp guns, obturation that is, the sealing of the breech against the escape of gas was performed by a soft metal ring let into the face of the vent piece or wedge.
If the cannon is bronze, it will often have a vent piece made of copper screwed into the length of the vent.
If your dryer vent is very long with several bends, and you have a leaf blower, you can buy a rubber hose adapter that fits onto both the leaf blower end and the vent piece sticking out of the wall (mine was a 3" to 4" adapter - found in the outdoor PVC pipe area of a home and garden box store), along with some hose clamps.
Similar(5)
An iridium platinum alloy was used for the touch holes or vent pieces of cannon.
The gun was loaded from the rear, the breech being closed by a "vent-piece" of steel that was dropped into a vertical slot and secured there by a large-diameter screw.
Those who know the constant trouble and expense which are occasioned by the wearing of the vent-pieces of cannon when in active service, will appreciate this important adaptation".
Backing zippered vents were pieces of neon mesh.
A number of angry comments beneath the piece vent opposition to Alther's comments.
Related(1)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com