Core TradesQuestion 142 of 700
In a long horizontal drainage line, cleanouts are generally required at intervals not exceeding approximately:
a.100 feet
b.25 feet
c.50 feet
d.200 feet
Explanation
Cleanouts are required at intervals not exceeding 100 feet on horizontal drainage piping, plus at each aggregate change of direction exceeding a set total, so a drain snake can reach any blockage. 25 and 50 feet are more frequent than required, and 200 feet leaves portions unreachable for cleaning.
Law Reference: 2025 CA Plumbing Code §707.0Practice all 700 questions free — no signup required.
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