Master Plumber Practice Exam 2026 - Free Plumber Practice Questions and Study Guide

Question: 1 / 400

An indirect waste pipe 12 feet long requires ____.

A trap only

A 12-foot long indirect waste pipe requires a trap only because its primary function is to prevent any sewer gases from entering the building. Indirect waste pipes are designed to discharge into a receptor rather than directly into a drainage system, which means they often do not need a vent to function properly. The trap provides the necessary seal against gas while allowing for drainage without the risk of backflow.

In this case, there is no requirement for a vent since the nature of an indirect waste system includes discharging through a fixture that maintains an adequate drainage slope and utilizes the trap for water seal. While a vent might be useful in some scenarios to maintain proper airflow in drainage systems, it is not a requirement for this specific setup. This distinguishes the requirement of the trap, making it the essential component for facilitating proper waste management in this context.

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A trap and vent

No trap or vent

A vent only

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