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The round copper stopper of an old water bottle with a removable round copper plate as a seal. The plate has a knob and the stopper features a corresponding notch in the middle so that the stopper plate can be perfectly positioned.

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The round copper stopper of an old water bottle with a removable round copper plate as a seal. The plate has a knob and the stopper features a corresponding notch in the middle so that the stopper plate can be perfectly positioned.
https://f2.tchncs.de/media_attachments/files/108/815/447/260/782/187/original/a2d2d186b6a14285.jpeg

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pandora (pandora@social.tchncs.de)'s status on Saturday, 13-Aug-2022 21:11:00 JST pandora
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The stopper works without a rubbery seal and still the bottle is watertight

In conversation Saturday, 13-Aug-2022 21:11:00 JST from social.tchncs.de permalink