Which type of trap typically has two weirs?

Drum traps are designed with two weirs, which are important structural features that help manage the flow of water within the trap. The two weirs in a drum trap allow for effective water sealing and drainage. They work together to maintain the water seal while also permitting the flow of wastewater, preventing any potential backflow or odors from rising into the living space.

Typically, the drum trap consists of a cylindrical body with these weirs positioned at different heights, which optimizes the flow and traps any debris that might otherwise obstruct drainage. This design also ensures a more consistent water seal, making drum traps effective for certain plumbing applications where the gravitational flow is not entirely reliable.

Understanding the role of the weirs in drum traps is crucial for anyone studying plumbing, especially in regard to how traps function to maintain system integrity and prevent issues like leaks or foul odors in fixtures.