Massachusetts Plumbers Journeyman Practice Exam

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How far apart should cleanouts be placed in all horizontal drainage piping for pipes with a nominal diameter of four inches or less?

  1. 25 feet

  2. 50 feet

  3. 75 feet

  4. 100 feet

The correct answer is: 50 feet

Cleanouts should be placed in all horizontal drainage piping for pipes with a nominal diameter of four inches or less every 50 feet. This distance ensures that there is easy access for maintenance and inspection purposes in case of a blockage or buildup in the piping system. Option A (25 feet), Option C (75 feet), and Option D (100 feet) are not correct as they do not align with the standard distance requirements for cleanouts in horizontal drainage piping for pipes of this size.

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