Rhode Island Journeyman Plumber Practice Exam

What type of plumbing fixture requires a trap?

1. Sink

2. Shower

3. Toilet

4. All of the above

The correct answer is: All of the above

All types of plumbing fixtures—sinks, showers, and toilets—require a trap as an essential component of their design. A trap is a curved section of piping that holds a small amount of water, which serves as a barrier to prevent sewer gases from entering living spaces. In the case of sinks, the trap helps to maintain a seal that keeps unpleasant odors at bay while also allowing wastewater to drain away. For showers, the trap works to accomplish the same task, ensuring that any waste water or debris is removed while also preventing harmful gases from leaking into the bathroom. Toilets also incorporate a trap in their design, specifically designed to handle waste while blocking foul odors. The unique configuration of a toilet trap is important not only for its function but also for ensuring the efficient movement of waste through the plumbing system. Since all three fixtures incorporate traps for these critical reasons, it's clear that a trap is indeed essential for all types of plumbing fixtures.