What is a disadvantage of a sanitary tee fitting?

A sanitary tee fitting is designed to connect two pipes, typically in a drainage system, allowing for a branch connection. However, one significant disadvantage of using a sanitary tee fitting is that it has a greater likelihood of siphoning traps.

This occurs because the design of the fitting can create conditions where negative pressure might develop in the branch line, particularly when water flows through the main line. If the flow displaces air within the drainage system, it may lead to the siphoning of water from the trap, potentially allowing sewer gas to enter the building. This situation is particularly critical in plumbing design, as traps are essential for preventing odors from sewer gases. Proper design practices recommend specific alternatives, such as using a sanitary cross or a combination fitting, to avoid this siphoning effect.

In contrast, the other options describe potential installation or space challenges but do not directly address the critical functional issues related to trap sealing, which can lead to serious problems in a plumbing system.