Massachusetts Plumbers Journeyman Practice Exam 2025 – All-in-One Guide to Master Your Licensing Test!

Question: 1 / 400

How close to the trap weir should no vent be installed?

Two pipe diameters

A vent should not be installed closer than two pipe diameters to the trap weir to prevent any interference with the proper functioning of the trap. Installing the vent too close to the trap could potentially disrupt the water seal in the trap, leading to sewer gas escaping into the building. Therefore, maintaining a distance of at least two pipe diameters ensures that the vent functions effectively without causing any issues with the trap.

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Three pipe diameters

Four pipe diameters

Five pipe diameters

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