2352
THE NEW ZEALAND GAZETTE.
[No. 6

Flushing of water-closets.
(e.) Every water-closet shall be provided with an approved appliance for flushing the closet-basin with water; such appliance shall not be connected directly to the public water-supply pipes, but there shall be a cistern provided, the bottom of which shall be at a height of not less than 5 ft. above the level of the top of the closet-basin, and such cistern shall be constructed and fitted as follows:—
(i.) The cistern shall be made of galvanized or glazed cast iron or other approved material.
(ii.) It shall have a capacity sufficient to provide a flush of not less than 2½ gallons or more than 3 gallons of water.
(iii.) The water-supply for every cistern shall be supplied by means of a pipe not less than ½ in. diameter, provided with a separate stop-tap, and discharging into the cistern through an effective ball cock which shall be readily accessible.
(iv.) The cistern shall be fitted with an overflow-pipe of lead or galvanized wrought iron not less than ¾ in. in diameter discharging in the open air in a position readily seen.
(v.) The flush-pipe connecting the cistern to the closet basin shall be as straight as possible, not less than 1¼ in. diameter, composed of copper, brass, galvanized wrought iron, or of lead of a weight not less than 6 lb. to the square foot, and protected by means of a buffer from possible injury from raising the closet-seat.
(vi.) The flushing-valve of the cistern shall be of approved type, operating easily.

Flushing of specified types of water-closet.
(f.) In lieu of a flushing-cistern as prescribed in the last preceding paragraph, a flushing appliance of approved type may be used with the approval of the Engineer; and in regard to such appliances known as the “Combination closet,” shall be of a capacity of not less than 2½ gallons, and for the types requiring storage cisterns such cisterns shall have a capacity of not less than 18 gallons.
(g.) Groups of closet-basins for use in schools, public buildings, workshops, or factories shall be of a type and flushed by means of automatic or other appliances approved by the Engineer.

Structure of soilpipes.
(h.) The basin of every water-closet shall be connected to the drain by means of a pipe herein referred to as the “soilpipe,” and such “soilpipe” shall be constructed and fitted as follows:—
(i.) It shall have an internal diameter of not less than 3½ in.
(ii.) Wherever it is not bedded in the ground it shall be made of lead or of cast iron, otherwise it shall be made of cast iron.
(iii.) It shall be fixed as far as practicable on the outside of the building effectively supported and protected from damage.
(iv.) It shall be free of traps or other obstructions throughout its length.

Ventilation of soilpipes.
(v.) It shall be extended upwards as a vent-pipe on the outside of the building in as direct a line as possible from above the highest of any branch closet connections to a level at least 3 ft. above the eaves or parapet of the building, and at least 6 ft. from any window below and 12 ft. from any window at or above the level of the termination of the vent-pipe, and 3 ft. from any chimney opening; and such extension shall be not less than 3½ in. internal diameter, and shall be made of lead, galvanized wrought iron or cast iron. Where wholly outside a building and from a single closet, where the soilpipe is not over 6 ft. in length and is fitted with a back vent, it shall not be necessary to extend this soilpipe upwards as a vent-pipe.
(i.) Two or more closets may be connected to the same soilpipe.

Back vents for soilpipes.
(j.) The trap of every closet-basin shall be ventilated on the side of the water-seal next to the soilpipe by a pipe to be known as the “back vent,” 2 in. in diameter, made of lead, cast iron, or galvanized wrought iron and connected to the soilpipe above the level of the seat of the highest branch water-closet connection, or carried up to a point 3 ft. above