What is the minimum seal depth required on a trap?

The minimum seal depth required on a trap is typically between 2" to 4". This depth is essential to ensure that there is a sufficient amount of water in the trap to create a barrier against sewer gases while also preventing unpleasant odors from escaping into the living space. The water seal acts as a protective barrier, and maintaining this minimum depth ensures that proper functioning is achieved.

Traps are designed to hold enough water to remain effective. If the seal is too shallow, it may allow gases to pass through. Conversely, a depth that exceeds the specifications could lead to other plumbing issues. This depth range strikes a balance between function and practicality within plumbing systems. Understanding the proper measurements is crucial for maintaining health and safety standards in plumbing installations.