Illinois Plumbing Code Practice

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How wide should the waste outlets for bathtubs be for plumbing code compliance?

  1. 1 inch

  2. 1 1/4 inches

  3. 1 1/2 inches

  4. 2 inches

The correct answer is: 1 1/2 inches

For plumbing code compliance, the waste outlets for bathtubs should typically be 1 1/2 inches wide. This size is specified in the Illinois Plumbing Code to ensure proper drainage and to prevent clogging or backup issues in the plumbing system. Option A (1 inch) is too narrow for efficient drainage in a bathtub, while option B (1 1/4 inches) is also not wide enough as per the standard requirements. Option D (2 inches) is too wide for a typical bathtub waste outlet and would not be in line with the standard specifications.

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