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Yes and no it does and does and doesnt.

A2. The S-bend or the P-bend under the sink is intended to provide a water trap in the Plumbing line. Otherwise sewer smells could enter your room.

There also needs to be a vent to the air in the drain pipe between your sink and the sewer main. If this is obstructed, then the flow of water elsewhere in the system could suck the water out of the trap. This could get blocked by birds or excessive build-up of grease.

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