what is a p trap

A P-trap is a specialized fitting used in plumbing systems that creates a barrier to stop sewer gas and odor from entering your home. It is named after its shape, which contains a U-shaped bend that filters wastewater as it enters a plumbing system. The trap is connected to a sink, bathtub, or shower with a J-bend on one end and exits into your drainage system. The bend in the P-trap collects water in the curve, creating a 1-½-inch to 2-inch water seal at the weir, preventing sewer gases and odor from entering the home. The P-trap also collects debris and solids from entering your drainage system, capturing sediment and preventing it from passing into the sewer. P-traps are an essential component of modern plumbing design and are used in most modern homes under each toilet, sink, shower, and bathtub. They do not require routine maintenance but can accumulate debris in the bend over time, leading to clogs. Another potential problem with P-traps is that they can eventually vent sewer gases into a living area if the water in the trap evaporates over time.