SECTION P-413 FLOOR AND TRENCH DRAINS
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P-413.3 Size of floor drains and trench drains. Floor drains, emergency floor drains, and trench drains shall have a drain outlet not less than 2 3 inches (51 76 mm) in diameter. Note: An adjustable repair coupling shall be permitted to connect underground piping to a floor drain or trench drain.  354
Exception: Floor drains serving one and two-family dwellings shall have a drain outlet not less than 2 inches (51 mm).
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Notes

354
   Amended, Bill No. 230653 (approved December 20, 2023), effective April 1, 2024.