Which plumbing fixture type is designed to prevent the backup of sewage?

The choice of floor drain as the plumbing fixture designed to prevent the backup of sewage is accurate because floor drains are specifically engineered to manage the flow of wastewater, including potential sewage backups. They serve as a crucial component in plumbing systems, allowing for the gravity drainage of water and waste, and are typically equipped with a trap that helps to keep sewer gases from entering buildings while also providing a pathway for wastewater to exit.

In addition, floor drains are strategically placed in areas prone to water accumulation, such as basements, bathrooms, and kitchens, to efficiently direct wastewater away from these spaces. Their design often includes features that allow for the collection of excess water, and they can be equipped with backflow prevention devices to further mitigate the risk of sewage flooding in case of a blockage or overload in the sewer system.

On the other hand, other plumbing fixtures, such as urinals, sinks, and toilets, serve different functions within a plumbing system. While they are designed to handle certain waste flows, they do not inherently prevent sewage backup in the way that a floor drain does. For instance, toilets are meant to dispose of human waste directly into the sewer system, but they aren't designed primarily to manage overflow situations like floor drains.