Drainage, Waste & VentQuestion 82 of 360
The use of an S-trap on a fixture is:
a.Permitted for all fixtures
b.Prohibited
c.Permitted if a deep seal is used
d.Permitted for outdoor fixtures
Explanation
S-traps are prohibited because the downward outlet directly below the trap makes the seal prone to self-siphonage. Fixtures must use a properly vented P-trap instead. A deeper seal or an outdoor location does not make an S-trap acceptable.
Law Reference: 2022 California Plumbing Code (CPC) §1002.0Practice all 360 questions free — no signup required.
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