Master Plumber Practice Exam 2025 - Free Plumber Practice Questions and Study Guide

Question: 1 / 400

The trap arm of a fixture must be positioned at a slope of ____.

1/4 inch per foot

The requirement for the trap arm of a fixture to be positioned at a slope of 1/4 inch per foot is based on plumbing code and best practices for drainage systems. This specific slope is essential because it ensures that wastewater flows efficiently through the trap arm while preventing the accumulation of debris and preventing clogs. A slope that is too shallow, such as 1/8 inch per foot or 1/16 inch per foot, may not provide adequate drainage, increasing the risk of stagnation and blockages within the piping. Conversely, having no slope at all would lead to significant drainage issues, including potential backflow, since gravity is essential for the proper movement of wastewater. Thus, the 1/4 inch per foot slope is optimal for maintaining a clear, functioning drainage system while adhering to established plumbing standards.

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1/8 inch per foot

1/16 inch per foot

No slope allowed

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