Drainage, Waste & VentQuestion 78 of 360
The minimum trap size for a shower is:
a.1-1/2 inch
b.2 inch
c.1-1/4 inch
d.3 inch
Explanation
A shower requires a minimum 2 inch trap and drain to handle its flow without backing up. A 1-1/2 or 1-1/4 inch trap is too small and would restrict drainage. A 3 inch trap exceeds the minimum for a single shower.
Law Reference: 2022 California Plumbing Code (CPC) §702.0 (Table 702.1)Practice all 360 questions free — no signup required.
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