How does a water faucet/tap work? The ones with both hot and cold water in 1 tap (looking at you, England).
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All of what you see on the outside is to control what is essentially a tube with holes in it. When you turn it “on”, you are pushing this pipe in to where the holes in it meet the water pipes. When you push it side to side to adjust the temperature, you are rotating the holes away from one pipe and toward the other, making the water hotter and colder.
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