Illinois Plumbing Code Practice

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Prepare for the Illinois Plumbing Code Test! Enhance your skills with diverse multiple-choice questions and detailed explanations. Ace your plumbing exam with ease!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What size should the waste outlet for a bathtub be?

1 inch
1.25 inches
1.5 inches
1.75 inches

The correct answer is: 1.5 inches

The correct size for the waste outlet of a bathtub is indeed 1.5 inches. This dimension is specified in the Illinois Plumbing Code, which ensures adequate drainage and minimizes the risk of clogging. A 1.5-inch waste outlet allows for efficient removal of water from the bathtub, accommodating potential flow rates and the design of standard bathtub fixtures. Other sizes such as 1 inch, 1.25 inches, or 1.75 inches do not meet the requirements for bathtub applications. A 1-inch outlet is too small, potentially leading to slow drainage and increased risk of overflow. The 1.25-inch size may also be insufficient for the volume of water that a bathtub can hold. While 1.75 inches may seem reasonable, it is not standard for residential bathtub installations, and using it could complicate connections with existing plumbing infrastructure. Thus, 1.5 inches strikes the right balance between capacity and compatibility with standard plumbing systems.