The answer to 'how does P-trap work' is that a P-trap is a curved section of pipe under a sink or other fixture that is designed to hold water, creating a seal that prevents sewer gases from entering the home. The curved shape of the P-trap allows water to collect and create a barrier, blocking odors and preventing pests from coming up through the drain.
The P-trap works by creating a water seal that blocks sewer gases from entering the home. When water flows down the drain, it fills the curved section of the P-trap, leaving a small amount of water behind. This water seal prevents sewer gases from backing up and entering the living space. The P-trap is an essential plumbing component that helps maintain indoor air quality and prevent unpleasant odors.