Drainage, Waste & VentQuestion 77 of 360
The minimum trap and drain size for a residential kitchen sink is:
a.1-1/2 inch
b.1-1/4 inch
c.2 inch
d.3 inch
Explanation
A kitchen sink requires a minimum 1-1/2 inch trap and drain and carries 2 DFU. A 1-1/4 inch trap is too small for a kitchen sink and is used for lavatories. A 2 or 3 inch trap exceeds the minimum requirement for this fixture.
Law Reference: 2022 California Plumbing Code (CPC) §702.0 (Table 702.1)Practice all 360 questions free — no signup required.
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