13 Any person who shall connect a stoneware or semi- connection vitrified ware trap or pipe with a lead soil pipe, waste pipe, or trap communicating with a sewer, shall insert between closet, such stoneware or semi-vitrified ware trap or pipe and such lead soil pipe, waste pipe, or trap, a socket of copper, brass, or other suitable alloy, and shall insert such stoneware or semi-vitrified ware trap or pipe into such socket, making the joint with Portland cement, and shall connect such socket with the lead soil pipe, waste pipe, or trap, by means of a wiped or overcast metallic joint ; provided always that it shall be sufficient if he shall connect the stoneware o- semi-vitrified ware trap or pipe with the lead soil pipe, waste pipe or trap, in an equally suitable and efficient manner.

He shall construct such ventilating pipe in drawn lead or of heavy cast iron.

Provided that in any case where it shall be necessary to construct such ventilating pipe within a building he shall construct such ventilating pipe in drawn lead.

He shall construct such ventilating pipe, whether inside or outside a building, so that if the pipe be of lead its weight shall not be less than forty-five Ibs.

Per twelve feet length, and if the pipe be of iron its thickness shall not be less than three-sixteen inch and its weight not less than twenty-five Ibs.