Hong Kong Regulations

BUILDING (STANDARDS OF SANITARY FITMENTS, PLUMBING, DRAINAGE WORKS AND LATRINES) REGULATIONS - REGULATION 26

Soil pipes

Pipes and eaves gutters

(1) The internal diameter of every soil pipe from a watercloset fitment or
slop sink shall be not less than-

   (a)  80 mm; or (L.N. 294 of 1976)

   (b)  the internal diameter of the outlet pipe of the trap of any fitment to
        which the soil pipe is connected, whichever is the greater.

(2) The internal diameter of every soil pipe from a urinal or bidet shall be
not less than the internal diameter of the outlet pipe of the trap of any
fitment to which the soil pipe is connected.

(3) Every soil pipe shall be properly connected to a covered drain without the
intervention of any trap.