• ServantOfRa@lemmy.blahaj.zone
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    5 hours ago

    IIRC, the lid can move up and down depending on how much content there’s in the tank. Something something provides pressure if it’s a gas.

    • anomnom@sh.itjust.works
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      3 hours ago

      Yup, I’m not sure about this lid specifically, but some slide up and down the tank, since water is denser than oil they don’t really care if rain water gets past the seal.