The minimum trap size for a bathtub is

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

The minimum trap size for a bathtub is

Explanation:
The amount of water and debris a tub can discharge requires a trap with enough cross-sectional area to keep drainage flowing smoothly and to prevent the trap from being a bottleneck. A 1 1/2 inch trap provides the needed capacity and aligns with plumbing codes for bathtubs, reducing the risk of slow drainage, clogs, or trap seal loss from siphoning. Smaller traps would restrict flow and are not suitable for a bathtub. So, the minimum trap size for a bathtub is 1 1/2 inches.

The amount of water and debris a tub can discharge requires a trap with enough cross-sectional area to keep drainage flowing smoothly and to prevent the trap from being a bottleneck. A 1 1/2 inch trap provides the needed capacity and aligns with plumbing codes for bathtubs, reducing the risk of slow drainage, clogs, or trap seal loss from siphoning. Smaller traps would restrict flow and are not suitable for a bathtub. So, the minimum trap size for a bathtub is 1 1/2 inches.

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