Clever sink plumbing traps smells and gasses

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The trap is an ingenious plumbing device that blocks hazardous sewer gases and foul smells from entering a room/building, while simultaneously allowing water through, just by bending a pipe. What makes this such an elegant design is that no extra parts are used- just a bend in the pipe itself, which traps a small amount of water that serves as a one way valve. The trap is a standard device found under most Western sinks.

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