What type of traps are considered prohibited in plumbing installations?

Drum traps are considered prohibited in plumbing installations primarily due to their design and function. These traps are larger, cylindrical devices meant to hold water to prevent sewer gases from entering the building, but they also create a significant number of issues in practice.

One major concern with drum traps is that they can easily become clogged over time. Their wide interior allows for the accumulation of debris and buildup of waste material, which can impede proper drainage and lead to backups. This clogging not only creates maintenance challenges but also encourages harmful bacteria growth if not regularly cleaned.

Additionally, drum traps often lack effective venting, which can result in poor drainage and increased pressure in the drainage system. This can lead to unpleasant odors, poor performance of the plumbing system, and even structural problems over time due to water damage.

In comparison, full "S" traps, bell traps, and crown vented traps, while they may have their own downsides and specific regulations surrounding their use, are generally permitted under various plumbing codes when installed correctly. Each of these alternatives offers a different approach to maintaining a proper seal against sewer gases while minimizing the risk of clogs, though they also may have specific installation requirements or considerations dictated by local codes. The focus on ensuring suitable performance and ease of