Massachusetts Plumbers Journeyman Practice Exam

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What is the maximum allowed piping distance from the trap outlet to the automatic vent fitting?

  1. 6 inches

  2. 8 inches

  3. 10 inches

  4. 12 inches

The correct answer is: 12 inches

The correct answer is 12 inches. In plumbing systems, particularly when working with traps and venting, it's critical to ensure that the distance from the trap outlet to the automatic vent fitting is within prescribed limits to ensure proper drainage and venting of the system. A distance of 12 inches is the maximum allowed because it helps maintain the efficiency of the venting system. If the distance exceeds this, it can lead to potential issues such as siphoning or malfunction of the trap, which can allow sewer gases to enter the living space and compromise sanitation. Therefore, adhering to this specific measurement is essential for safe and effective plumbing practices.

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