What type of trap is specifically designed to prevent sewer gas without affecting sewage flow?

The type of trap that is specifically designed to prevent sewer gas without affecting sewage flow is a water trap, commonly known as a P-trap. This trap is crucial in plumbing systems as it creates a water seal, which provides an effective barrier against sewer gases.

When mixed with water, the trap's design ensures that the flowing sewage moves past without obstruction, as the water in the trap remains at a specific level. This level retains enough water to block gases from entering the living space while still allowing liquids and solids to flow through.

In plumbing systems, it's important to ensure that the trap maintains this water seal to function correctly. While other types of traps, like grease traps or sanitary traps, serve different purposes (such as removing grease or managing waste, respectively), they do not focus solely on the prevention of sewer gas while optimizing sewage flow in the same effective manner as a water trap.