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Sec. 498. Bath traps.

Where two bathtubs are located within five feet from center to
center of waste, the use of one drum trap to trap both fixtures
will be permitted, provided each tub drains separately into a
trap through a one and one-half inch waste pipe. The waste
from trap to soil stack to be two inches. Where the owner prefers,
a non-syphoning trap for wash stand, bathtub or pantry sink
may be used above floor. Trap to be approved by the Superintendent.