In plumbing terms, what does a 'trap' refer to?

In plumbing terms, a 'trap' is indeed a device specifically designed to prevent sewer gases from entering a building. It typically consists of a curved section of pipe that holds a small amount of water at all times. This water acts as a barrier, effectively blocking harmful gases and odors that can come from the sewer system. The water in the trap forms a seal, ensuring that the gases cannot pass through while still allowing wastewater to flow through the drainage system.

The presence of traps is crucial in maintaining indoor air quality and ensuring safety within plumbing systems. For instance, every plumbing fixture that connects to the drainage system is required to have a trap for this reason. By understanding this function, it becomes clearer how vital traps are to effective plumbing and sanitation.