Inflatable pipe plug.
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Tampon leak plug - GIF
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nova_robotics (Mar 24, 2023),
Ralphxyz (Mar 24, 2023),
Scotty1 (Mar 19, 2023)
Here, the best known are "Cherne". Unsure about this one, those usually are more flat-ended. But inflatable plugs are used in all kinds of instances, available in a wide range of sizes.
...we'll learn more by wandering than searching...
nova_robotics (Mar 24, 2023)
They are deflating the inflatable plug.
Neat. I'm familiar with carber plugs for hydrotests, but those aren't inflatable.
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