Fixtures & Water HeatersQuestion 198 of 360
A standard fixture trap must maintain a liquid seal of not less than 2 inches and not more than:
a.4 inches
b.3 inches
c.6 inches
d.8 inches
Explanation
A trap seal must be between 2 and 4 inches deep unless a deep-seal trap is required by other provisions. Too shallow a seal is easily broken by siphonage; too deep can retain solids. The 2-to-4-inch range balances protection and self-cleaning.
Law Reference: 2022 California Plumbing Code (CPC) §1002.1Practice all 360 questions free — no signup required.
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