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45. No water closet or urinal apparatus or receptacle shall be cased in.
46. Every water closet and urinal shall be provided with an efficient soil pipe of cast-iron or wrought-iron securely fixed to the wall in the manner described for ventilating and waste-pipes; and such soil pipe shall be not more than (unless required by the Build- ing Authority) four inches in diameter in the case of water closets and not more than (unless required by the Building Authority) two inches in diameter in the case of urinals, and shall be properly con- nected to the drain at the foot, and shall be continued up in full diameter without bends or angles except where unavoidable, and shall terminate in an open end at least three feet in height above the eaves of the building to which it is affixed or of any adjacent building, and not less than ten feet from any window,
Such soil pipe shall be jointed with yarn and molten lead and well caulked.
Every soil pipe shall be provided with proper junctions for con- necting with the water closet or urinal receptacle, the trap of which shall be connected in a sound and substantial manner.
No soil pipe shall receive any pipe other than that from a water closet apparatus or urinal, and no trap shall be fixed in any portion thereof.
Every soil pipe shall be fixed throughout its entire length out- side the building in the open air.
47. When more than one trap for a water closet or urinal re- ceptacle is connected with a soil pipe, the trap of each and every such receptacle shall be provided with an air-pipe of cast iron or lead not less than one and a quarter inches in diameter in the case of urinals and not less than two inches in diameter in the case of water closets, which shall be carried up throughout its entire length outside the building, and shall either be connected to the soil pipe above the connexion with the uppermost trap, or shall terminate not less than three feet above the eaves of the building and not less than ten feet from any window.
48. All joints, pipes, fittings and apparatus in connexion with any water closet or urinal shall be perfectly water-tight and air-tight, and fixed to the satisfaction of the Building Authority.
49. All drains, sewers, and drainage works shall be built and carried out in all respects in accordance with the provisions of the Buildings Ordinance, 1984, and of these regulations and of any that may be made hereafter, and if no written notice provided by re- gulation No. 3 of these regulations shall have been given to the Building Authority by any owner or occupier about to construct, reconstruct, alter repair, or amend any drain or sewer on his pre- mises, and if by such default the Building Authority shall have had no opportunity of inspecting and approving or disapproving of any such drain, sewer or drainage works actually built and already cover- ed in, it shall be lawful for the Building Authority on discovering the existence of such drain or drainage works to call upon such owner or occupier to open and uncover the same for the purpose of inspection, and should such drain, sewer, or drainage works prove upon inspection to be defective either in respect of design, work- manship, or materials, they shall be deemed a nuisance under the aforementioned Ordinance and dealt with accordingly.
50. All works connected with the construction of drains, sewers, and connexions shall be carried out in strict accordance with the plans and sections previously submitted to and approved by the Building Authority, or with such amendments to such plans and sections as may have been required by him, to make them comply with the provisions of the Buildings Ordinance, 1934, and such works shall be carried out in a proper and workmanlike manner with the best materials of their respective kinds, and shall be subject during their progress to the control and supervision of the officers of the Building Authority appointed in that behalf and shall be completed to the entire satisfaction of the Building Authority.
51. Whenever any drain or sewer is about to be constructed or reconstructed, the Building Authority shall have power to require the provision of a surface channel of approved materials and design, in lieu of a covered drain or sewer, in any position in which a covered. drain or sewer may appear to him to be undesirable.