When the faucet is turned off, the screw works in the other direction and closes the opening, stopping the water flow — thus prohibiting you from passing through the opening. That is basically how the water gets from the pipes in the ground, through the faucet in your house, and out into your sink.

A sink drain always includes a “trap” that fills with water to prevent sewer gasses from rising into the house. Kitchen and bathroom sinks are connected to a home’s water supply system, which supplies the faucets, and to a home’s drain-waste-vent (DWV) system for the drains.

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