What is the function of a fixture trap in plumbing?

The function of a fixture trap in plumbing is primarily to prevent sewer gas emissions. A fixture trap is designed to hold a small amount of water, creating a barrier between the interior of a building and the sewer system. This water barrier effectively stops foul-smelling gases, which can be harmful or unpleasant, from entering the living space.

By maintaining this water seal, the trap ensures that any gases, odors, or insects from the sewage system cannot escape into the home. This is crucial for health and comfort in any plumbing system. Additionally, traps help to prevent blockages by capturing debris that might otherwise travel through the plumbing system.

In contrast to the other options, connections between pipes, filtering water, or increasing water flow are not primary functions of a fixture trap. Therefore, recognizing that the trap's core role is to safeguard against sewer gases highlights its critical importance in maintaining a safe and sanitary plumbing system.