What is the function of a trap in plumbing?

The function of a trap in plumbing is primarily to prevent sewer gases from entering the building. Traps are designed to hold a small amount of water in their curved section, creating a barrier that prevents gases, odors, and other possible contaminants from passing through the plumbing system and escaping into the living spaces of a building. This is crucial for maintaining indoor air quality and ensuring a healthy environment.

Traps are essential components of drainage systems, as they serve the dual purpose of keeping harmful gases at bay while also allowing wastewater to flow away from fixtures like sinks, toilets, and showers. Understanding this function highlights the importance of proper trap installation and maintenance in plumbing systems to ensure they effectively perform their intended role.