What is the minimum cold water supply line size to a urinal?

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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

What is the minimum cold water supply line size to a urinal?

Explanation:
When sizing a urinal’s cold water supply, the line must be able to deliver enough water for a proper flush without excessive pressure loss. Urinals typically require more flow than many other fixtures, so a smaller line can limit volume during the flush and weaken performance. A 3/4 inch supply provides sufficient flow and minimizes pressure drop, ensuring reliable flushing with standard valves. A 1/2 inch line tends to restrict flow and is more prone to inadequate flush performance, while larger sizes are not necessary for meeting the minimum requirement. So the minimum suitable size is 3/4 inch.

When sizing a urinal’s cold water supply, the line must be able to deliver enough water for a proper flush without excessive pressure loss. Urinals typically require more flow than many other fixtures, so a smaller line can limit volume during the flush and weaken performance. A 3/4 inch supply provides sufficient flow and minimizes pressure drop, ensuring reliable flushing with standard valves. A 1/2 inch line tends to restrict flow and is more prone to inadequate flush performance, while larger sizes are not necessary for meeting the minimum requirement. So the minimum suitable size is 3/4 inch.

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