What distinguishes a trap from a cleanout in plumbing?

A trap is designed to retain a small amount of water, which serves as a barrier to prevent sewer gases from escaping into the living spaces of a building. This is crucial for maintaining indoor air quality and sanitation. Traps are typically found under sinks, bathtubs, and various fixtures, ensuring that odors do not enter through the drainage system.

On the other hand, a cleanout provides access to the plumbing system for maintenance purposes, such as removing clogs or performing inspections. Cleanouts are strategically placed in the plumbing system to allow for easy access to the pipes without having to dismantle the entire system.

Therefore, the distinction lies in the function: the trap's primary role is to block sewer gases, while the cleanout facilitates maintenance and access to the plumbing for potential repairs. This differentiates the two components within plumbing systems effectively.