All connections with any sewer fifteen inches (15") or smaller shall be made by means of "Y" or "T" branches or other special fitting provided in such sewer for that purpose.
If a connection to a sewer must be made at any other place where a "Y" or "T" branch has not been placed, where feasible a "Y" fitting shall be placed in the main sewer in the following manner; a section of sewer pipe shall be removed from the main sewer by breaking it to pieces, care being taken not be break, disturb or injure the adjacent pipe. The "Y" fitting shall then be inserted without chipping or breaking the pipe or branch, where possible; where not possible, the upper half (when in position) of the bell on the run of the "Y" branch to be inserted, and the upper half of the nearest adjacent bell on the existing pipe in the trench, shall then be carefully removed and the "Y" branch inserted wrong side up, and revolved to bring the branch to the side it is intended for, with the broken part of the bell up. The joint shall then be cemented in the proper manner, and the bells encased in three inches (3") of concrete.
A connection to a sewer may also be made by inserting in the sewer a standard saddle fitting. Such a fitting used shall be one designed for the purpose and shall not be improvised from the bell end of a straight length of pipe. Before cutting the hole in the sewer for the saddle fitting the sides and bottoms of the length of pipe in which the hole is to be cut, shall be strengthened by a layer of concrete not less than three inches (3") in thickness at any point. The hole in the pipe shall be carefully marked and chipped or pinched out, the saddle placed so that no part projects into the pipe and carefully mortared into position. Sections of pipe shall then be filled into the saddle to form a riser and all such pieces of pipe which are vertically over the sewer, shall be enclosed in a shaft of concrete having a thickness about the pipe of not less than three inches (3"). The shaft shall firmly rest on the block of concrete encasing the sewer pipe in which the connection was made. The concrete shaft shall be poured into a form of light sheet metal or stove pipe which form shall be left in place as the trench is backfilled. The earth backfill around the shaft shall be carefully tamped and the backfill brought up uniformly on all sides to prevent lateral loads on and the possible breaking of the shaft.