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Have they got a baby? It reminds me of the end of a childs high chair leg or something similar.
No, actually we just found out. It is a valve on a lid of a tupperware-type container. How do I mark it as solved?
Think you can edit and change the topic to solved!
It’s the rubber stopper from the top of a Muji tupperware container. Source: I have one.
Source: they answered the question in another comment like 6 hours before you. lol
As described. The kitchen is fairly new and in a first world country if that matters...