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3r2 Sec. 50. REPLACIMM OF OLD .0112JEES. When new fixtures are introduced on old .�-ork, it, will not be compulsory on the part of the owner to back vent same, but they shall have no -syphoning traps of approved type and in changing closets, only syphon closets with tanks will be allowed. Where there are no closets above, it will not be necessary to back vent fixtures, but the soil or waste pipe must in every case be extended ( not less than two inches in size.) 12he required (Iistance above the roof or into other vent pipe above highest fixtures. On repair of old work, in lieu of back vent pipe, a non -syphoning trap of approved type when connected with a washbasin, sink,urinal or wash tray, which is not more than fifteen feet from a main, will be permitted. Sec. 51. _IIID Oyu, CLOSETS ' PROIII3ITED. rdo direct water supply closet of any kind except with an approved flush valve will be permitted and when any such closet is taken out, it shall be replaced with a tank closet and shall be vented to conform to these rules. Sec. 52. ;IND Olt' CLOS TS PERIETTED. No water closet shall be placed within a hou:3e except eartrleriware or iron enameled inside with rolled flushing rim. All interior water closet compartments shall be ventilated by windows into the open air or into air shafts of not less than three square feet in area, or acceptable artificial light and ventilation. Closets in yard will not be required to be vented, provided that they connect with sewer within ten feet thereof with vent pipe in house or on same lot. All closets in yard shall be of an appro�,w�d anti -freezing type, havinj bowl enameled inside, provided with propor size flush tank. The door of the closet room shall be of sufficient size, well jointed, tight fitting, and self-closing. The house encloBing closet shall be constructed of good close fittin material and thoroughly fly -proof. �'or light and ventilation there shall be near the top of the. house at, least ono openi.nt7 not; less than two square feet which shall be covered with wire"fly ,3creening.11 Sec.53. SUPPLY PIPES. All water pipes within any building; and through premises to curb line must 0 be of best grade galvanized wrought iron or galvanized mild steel. rjo water pipe and must be clear of and above sewer pip placed in ground shall be smaller than three-fourths of an inch inside diameter./ Trenches for water pipes in :ground, outside of bu;ldings shall be not le:;:9 than twenty inches deep. All brass supply pipe to fixtures are to be full weight iron pipe size and with malleable pattern beaded fittings. No slip joint connections will be P�'rmlttea� on fixture supply pipes, except on combination supply fittings furnished as a part of the fixture. ,supply to any fixture shall not donnect below over -flow of same, known as bell or bottom supply. Sec. 54 �EIRA COTTA PIPE. '.'he terra cotta pipe from where it joins cast iron pipe to public sewer at ro pert line mu:�t be est i t nd of fol10Wi property y of b q zalit, number two or better salt glazed a sizes: 1 to 4 water closets -----------4" 5 to 16 'Na4 er closets ----------6"