trap (plumbing)

In plumbing, a trap is a curved pipe located beneath sinks, toilets, or drains that holds a small amount of water. This water creates a barrier that prevents sewer gases and unpleasant odors from escaping into the living space. Traps are essential for maintaining indoor air quality and preventing gases from entering the home while still allowing water and waste to flow out efficiently. They are typically U-shaped or S-shaped and are designed to be easily accessible for cleaning or removal of debris if clogs occur.