All horizontal piping shall be run in practical alignment and
at a uniform grade of not less than 1/4 inch per foot up to five-inch-diameter
pipe, inclusive, and not less than 1/8 inch per foot for all larger
sizes, and all piping shall be supported or anchored at intervals
not to exceed 10 feet. When making connections for house sewer and
five-inch tile or cast-iron Y-branches cannot be located on the public
sewer, the plumber, at his own expense, will cut a hole five inches
in diameter in the tile or cast-iron pipe, in the presence of the
Director of Water and Sewer Operations. Care must be taken in making
such tap in the public sewer that no damage will be caused to the
system. One length of four-inch extra-heavy cast-iron pipe will be
permitted through the foundation wall, with a reducer to connect with
the five-inch cast-iron pipe. All stacks shall be supported at their
bases, and all pipes shall be rigidly secured.
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