Master Plumber Practice Exam

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What is the maximum distance between cleanouts in horizontal drain piping?

50 feet
300 feet
75 feet
100 feet

The correct answer is: 100 feet

In plumbing, cleanouts are access points in a drainage system that allow for maintenance and clearing of blockages. The maximum distance between cleanouts in horizontal drain piping is set to ensure that a plumber can easily access the system for maintenance without overly long stretches between these access points. A distance of 100 feet is established in many plumbing codes, such as the International Plumbing Code (IPC), as a standard for the maximum spacing. This allows for sufficient access while minimizing the risk of debris buildup that could create clogs. It strikes a balance between practicality in installation and efficiency in maintenance, ensuring that plumbers can effectively service the system. While some codes may have different specifications for varying sizes of pipes, the general consensus for common residential plumbing sizes supports this 100-foot maximum distance. This guideline is crucial for maintaining the integrity and functionality of the drainage system. Having cleanouts spaced at appropriate intervals helps prevent extensive and costly repairs by facilitating easier access for maintenance.