Red Seal Plumbing Practice Exam

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Study for the Red Seal Plumbing Exam. Engage with interactive quizzes and multiple-choice questions designed to help you master the essential plumbing concepts. Equip yourself for success on your credentialing exam!

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 is the size of cleanout for drainage piping greater than 4 inches?

Same size as drainage piping
5" (125mm)
6" (150mm)
3" (75mm)

The correct answer is: Same size as drainage piping

Drainage piping greater than 4 inches require a cleanout that is the same size as the piping itself. This is because a larger pipe size can handle a larger amount of waste and debris, so a larger cleanout size is necessary for proper maintenance and access. The other options are incorrect because they either suggest a smaller cleanout size (B, C, D) or a different size than the piping (B, C). Using a smaller cleanout size could result in clogging and difficulty accessing the pipe for maintenance. Therefore, choosing the same size as the piping, as indicated in option A, is the correct and most practical choice.