drain trap

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Related to drain trap: Plumbing trap


1. A device to maintain a water seal against sewer gases, air, and odors; also called a stench trap.
2. A removable section of a theater stage floor.
3. Same as traprock.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Before you start demolishing the walls, make sure there's water in the floor drain trap. If the floor drain hasn't been used in a long time, the water in the trap can evaporate and allow sewer gas into the house.
Even more serious, water can be drawn out of the drain trap, eliminating that all-important seal between the sewer line and your home.
1 TOP OFF the drain trap water level by adding a quart of water.
The traditional remedies: Either use harsh chemicals or disassemble the drain trap to clear the blockage.