Drainage, Waste & VentQuestion 98 of 360
The drainage fixture unit (DFU) value of a private bathtub is:
a.1
b.2
c.3
d.4
Explanation
A private bathtub (with or without a shower over it) is assigned 2 DFU. A value of 1 corresponds to a lavatory, and 3 or 4 would overstate the discharge of a single tub. Correct DFU values are needed to size branches and drains properly.
Law Reference: 2022 California Plumbing Code (CPC) §702.0 (Table 702.1)Practice all 360 questions free — no signup required.
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