emYour water bottle and coffee mug? They have gaskets to keep them from leaking. Your hose connection to your house, or your shower head. Gasket. I duno why, it just feels nice to see them everywhere. Like, I knew my water bottle had a rubbery thing, but it didn't occur to me that it's basically the same principle as how my sink plumbing works until I built or destroyed a few sink fixtures and learned about boat building.
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