Red Seal Plumbing Practice Exam

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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.