Where should the lower end of a relief vent connect in a drainage stack?

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The lower end of a relief vent should connect below the drainage branch connection. This positioning serves a specific purpose in plumbing design. By connecting below the branch connection, the relief vent can effectively allow air to enter the drainage system, which helps prevent siphoning of traps and ensures proper drainage flow.

When a drainage branch is connected, especially in scenarios where multiple fixtures are served, the lower connection facilitates the equalization of pressure within the system. This is crucial because if the pressure drops due to water flowing down the stack, a properly positioned relief vent will allow air in, preventing negative pressures that could lead to drainage issues.

Connecting the relief vent below the drainage branch ensures that it can adequately perform its function within the drainage system, thereby supporting overall hydraulic efficiency and maintaining the integrity of the plumbing system.

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