What is the minimum size of the hot and cold water supply lines to a bathtub?

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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 size of the hot and cold water supply lines to a bathtub?

Explanation:
The size tested is about fixture supply sizing and how copper tubing is measured. For a bathtub, the minimum is 1/2 inch nominal tubing. In copper tubing, the number refers to the nominal inside diameter, not the exact bore or the outer dimension. A 1/2" nominal tube actually has an outer diameter of 5/8", so the correct description is 1/2" ID (5/8" OD). This size provides enough flow at typical residential pressures while matching standard fittings; smaller lines would restrict flow and larger ones aren’t the minimum required.

The size tested is about fixture supply sizing and how copper tubing is measured. For a bathtub, the minimum is 1/2 inch nominal tubing. In copper tubing, the number refers to the nominal inside diameter, not the exact bore or the outer dimension. A 1/2" nominal tube actually has an outer diameter of 5/8", so the correct description is 1/2" ID (5/8" OD). This size provides enough flow at typical residential pressures while matching standard fittings; smaller lines would restrict flow and larger ones aren’t the minimum required.

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