Made of glass and metal, it looks like an hourglass. The principle is slightly like the mocha kettle, with its own heating device, but it avoids the embarrassment that the old mocha kettle is overheated and difficult to operate. As the water is heated, rising air pressure causes it to flow upward to the metal upper seat, and once the coffee is ready, the heat will bring it back to the original glass bottle. Just turn the handle to let the coffee flow out.
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