What is the role of a trap in plumbing systems?

A trap plays a crucial role in plumbing systems by primarily serving to prevent sewer gases from entering the building. Its design creates a water seal, which acts as a barrier between the waste system and the interior of the property. By holding a small amount of water, the trap prevents harmful and foul-smelling gases from escaping the sewer system and infiltrating the living spaces. This is essential for maintaining air quality and ensuring the health and safety of the occupants.

It's important to note that while traps can also help with the prevention of debris from entering the plumbing system, their primary function is the creation of this barrier against harmful gases. Understanding the specific purpose of a trap underscores its vital role in promoting safe and effective plumbing design and operation.