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

Question: 1 / 400

What minimum water seal must floor/trough drains provide?

Two inches

The minimum water seal that floor and trough drains must provide is two inches. This water seal acts as a barrier, preventing sewer gases from entering the living space. The two-inch water seal is a standard requirement in plumbing codes, ensuring adequate protection against odors and harmful gases that could be emitted from the drainage system.

Using a water seal of less than two inches could increase the risk of sewer gas escaping into the occupied areas, which could pose health hazards. Therefore, the two-inch requirement is crucial for maintaining a safe and sanitary environment in buildings where floor and trough drains are installed.

Get further explanation with Examzify DeepDiveBeta

Three inches

Four inches

Five inches

Next Question

Report this question

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy