TapImage copyright: Jonathan Sayles Taps are either gravity fed, or use a power system to draw water through the tap. Gravity system taps usually have a water storage tank higher than the sink/bath that is filled from the mains water supply. As the mains water supply comes into a property under pressure, the water is able to be pushed into the storage tank ready for someone to open a tap and thus allows the water to run downwards into the basin. It is believed to be the Romans who first invented the tap, and it had what was effectively a thread that was unscrewed to allow liquid to pass.
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