Massachusetts Plumbers Journeyman Practice Exam 2026 – All-in-One Guide to Master Your Licensing Test!

Question: 1 / 400

The vent opening should be placed:

As high and close to the fixture as possible

The correct choice highlights an important principle in plumbing design — placing the vent opening as high and as close to the fixture as possible ensures that it effectively prevents siphoning and allows for proper drainage. By positioning the vent this way, it helps maintain the pressure balance within the drainage system, promoting better flow and minimizing the likelihood of back-pressure or gurgling, which can occur when the vent system is inadequate.

When the vent is close to the fixture, it allows for the quick release of air, especially if a large volume of water flows rapidly, thus facilitating smooth drainage. High placement also reduces the risk of blockage from debris or condensate, further sustaining effective ventilation over time. This reasoning underpins why this choice is optimal for ensuring the functionality of the plumbing system.

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Two inches above the fixture

At the level of the base of the fixture

Directly below the fixture

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