Massachusetts Plumbers Journeyman Practice Exam

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Prepare for the Massachusetts Plumbers Journeyman Exam. Study with flashcards and multiple-choice questions, each question has hints and explanations. Get ready for your exam!

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Where should a trap not be installed according to the text?

Main drain
Indirect waste pipe
Vent stack
Sewer line

The correct answer is: Vent stack

A trap should not be installed in the vent stack because the purpose of a vent stack is to provide air circulation within the plumbing system. This ensures that sewage gases are vented outside and helps maintain proper drainage by preventing vacuum conditions. If a trap were installed in the vent stack, it would obstruct the flow of air and could create a blockage, leading to sewer gases being trapped within the system. This could potentially cause hazardous conditions, including the risk of sewer gas buildup in the building. Hence, maintaining a clear vent stack is critical for the overall health and safety of the plumbing system.