Curved, U-section of drain pipe that holds a water seal to prevent sewer gasses from entering a building through a fixture's drain pipe.
Curved section of drain line that prevents sewer odors from escaping into the atmosphere. All fixtures that have drains must have a "P" trap installed. A toilet is the only plumbing fixture with an "S" trap.
A piece of pipe shaped like the letter P, used in drains. Its shape prevents fumes or sewage gases from going against the flow of draining water and entering the interior of a home